419 results about "Salt bath" patented technology

The invention provides a 10.9-grade non-quenched and tempered cold heading steel wire rod and a production method thereof. The 10.9-grade non-quenched and tempered cold heading steel wire rod comprises the following chemical components: 0.23-0.27% of C, 0.30-0.50% of Si, 1.45-1.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.40-0.50% of Cr, 0.025-0.050% of Ti, 0.0025-0.0050% of B, less than or equal to 0.0050% of N and more than or equal to 0.015% of [Ti]-3.5 * [N]. According to the invention, on the basis of component design, a controlled rolling process deformation induced phase change, an online salt bath isothermal treatment cooling process and an artificial aging process are matched, so that rapid cooling and isothermal phase change of the wire rod are realized, and the prepared wire rod is uniform in through ring mechanical property, high in yield ratio, good in plasticity and long in fatigue life. The steel wire rod can be used for directly cold-drawing the steel wire without annealing, and the cold-drawn steel wire can meet the performance requirement of a 10.9-grade fastener without quenching and tempering after being formed. According to the production method of the wire rod, the production process can be simplified, the fastener production period is shortened, the cost is reduced, meanwhile, the energy consumption is reduced, and the method conforms to the current green and low-carbon development route.

The invention discloses a high-strength wear-resistant self-lubricating drill bit for a coal mine and a preparation method of the high-strength wear-resistant self-lubricating drill bit. The preparation process comprises the steps that a drill bit blank is prepared from low-alloy carbon structural steel, a high-strength and high-toughness matrix is obtained through thermal refining, and then sand blasting activation is conducted to clean and coarsen the surface. After diamond particles are subjected to acid pickling pretreatment, metal modified diamond composite powder is obtained through salt bath metal and reduction prefabrication. The preparation method comprises the following steps: mixing MoS2 with the carbon dioxide, spraying the mixture on the surface of a matrix through high velocity oxy-fuel to form a wear-resistant coating, and then improving the density and interface bonding strength of the coating through high-frequency induction instantaneous remelting, thereby finally obtaining the coal mine drill bit with high hardness, strong bonding force and self-lubricating performance. The metal modified diamond composite coating containing the metal transition layer and the MoS2 lubricating phase is constructed on the steel substrate, and a high-frequency remelting process is combined, so that the wear resistance, the bonding strength and the self-lubricating performance of the drill bit are synergistically improved, and the drill bit has the advantages of high strength and toughness matching and low cost.

The invention relates to the technical field of metal surface treatment, in particular to a method for improving the surface performance of a metal part through salt bath composite nitriding treatment, and particularly relates to a salt bath composite nitriding treatment process for a high-wear-resistance and high-fatigue shaft pin. Comprising the following steps: 1) pretreatment: carrying out sand blasting cleaning on the shaft pin and polishing until Ra is less than or equal to 0.8 mu m; 2) salt bath composite nitriding treatment: immersing the shaft pin into a salt bath containing sodium cyanate, potassium cyanate, sodium carbonate, lithium carbonate and an additive, and keeping the temperature at 560 DEG C for 2-4 hours; and (3) cooling and strengthening treatment: slowly cooling after dynamically cooling to 500 DEG C, and releasing residual stress in combination with oxidation treatment and low-temperature tempering. According to the process, a compact nitriding layer and a micro-boronizing layer are formed through the synergistic effect of rare earth oxide and fluoride, so that the surface hardness of the shaft pin reaches HV800-1100, the depth of the nitriding layer is 0.1-0.3 mm, the wear resistance is remarkably improved, the fatigue life is remarkably prolonged, the corrosion resistance is remarkably improved, and the process is suitable for surface strengthening of high-load mechanical parts.

The invention discloses hot-rolled air-cooled bainite steel as well as a preparation method and application thereof. The hot-rolled air-cooled bainite steel comprises the following chemical components in percentage by mass: 0.18%-0.28% of C, 1.6%-2.4% of Mn, 0.8%-1.5% of Si, 0.2%-0.6% of Cr, 0.1%-0.2% of Mo, 0.02%-0.08% of V, 0-0.015% of Ti, 0.01%-0.02% of Al (t) and the balance of Fe and residual trace impurities. The preparation process of the hot-rolled air-cooled bainite steel is simple, carbide-free bainite, retained austenite and martensite are formed through natural air cooling and low-temperature tempering of the hot-rolled round steel, the processes of quenching, quenching, medium-high temperature tempering, salt bath treatment and the like are avoided, the heat treatment cost can be saved, and emission of harmful gas is reduced. In addition, the hot-rolled air-cooled bainite steel is excellent in mechanical property and can be used for manufacturing large-size bolts.

The invention discloses a wear-resistant alloy casting part for electric machinery and a production process thereof, and relates to the technical field of electric casting part optimizing.The production process comprises the steps that raw materials are smelted to 1550-1620 DEG C under the protection of argon, and heat preservation is conducted for 30-60 minutes; composite modification treatment; performing low-pressure sand mold casting or die-casting molding; after a casting is austenitized for 1.5-3 hours at the temperature of 980-1050 DEG C, two-stage isothermal quenching is conducted in a salt bath, specifically, in the first stage, heat preservation is conducted for 15-25 minutes at the temperature of 280-320 DEG C, and in the second stage, heat preservation is conducted for 45-60 minutes at the temperature of 180-220 DEG C; and surface laser cladding is conducted, specifically, homogeneous alloy powder is adopted for conducting laser cladding with the lap joint rate being 35-50% on the working face of the casting part. The method has the beneficial effects that through the design principle of multi-scale cooperative strengthening and the cross-dimension coupling effect of material components, the process path and the microstructure, breakthrough improvement of the performance of the wear-resistant alloy casting is achieved.

The invention relates to the technical field of quenching treatment, in particular to a nodular cast iron isothermal quenching cooling method and an isothermal quenching cooling device.The method comprises the steps that when nodular cast iron of the current batch is subjected to cooling treatment in a cooling stage before isothermal quenching in a salt bath furnace, a thermal image of the surface of the salt bath furnace is collected in real time; acquiring a first characteristic value of each nodular cast iron; obtaining a furnace wall area and a non-furnace wall area in each thermal image; obtaining an average temperature value of each non-furnace-wall area; acquiring a local high-temperature area in each thermal image; acquiring a high-temperature characteristic value of each thermal image; acquiring a second characteristic value of each nodular cast iron; and the optimal rotating speed of the stirring device is obtained when the next nodular cast iron of the nodular cast iron of the current batch is subjected to cooling treatment in the cooling stage before isothermal quenching. The invention aims to improve the isothermal quenching cooling quality of the nodular cast iron by adjusting the rotating speed of the stirring device during the isothermal quenching cooling of the nodular cast iron.

The invention discloses a preparation method and application of a wind cap of a circulating fluidized bed gasifier, the wind cap is arranged at the bottom of a gasifier body, the wind cap mainly comprises a wind cap gas inlet, a wind cap gas outlet and a wind cap gas flow channel, and the wind cap gas flow channel is composed of a Tesla valve fluid channel. The air cap is prepared from modified fly ash through a combined method of freezing ball-milling nano modification, 3D printing coupling microwave-assisted sintering and salt bath chromizing strengthening. According to the method, a large amount of solid waste of fly ash can be consumed to realize carbon emission reduction, the efficiency of the circulating fluidized bed can be improved through structural optimization, meanwhile, the preparation cost of the hood can be reduced, and the method has relatively high application and popularization values.

The invention discloses an ultrahigh-strength wire rod salt bath heat treatment quality control method which is applied to the technical field of wire rod heat treatment and is suitable for developing high-end wire rod varieties such as bridge cables and ultrahigh-strength prestress wire rods in steel mills and deep processing enterprises. Forming a database according to the trademark of the wire rod, the component fluctuation, the salt bath heat treatment process and the wire performance corresponding to each wire of salt bath heat treatment, and establishing a relation model between the performance and the influence factors of the wire rod; performing concentration and analysis according to requirements of order users on wire performance; carrying out centralized production on the user orders which can share one salt bath heat treatment process; performing performance test on the head and the tail of the wire subjected to salt bath heat treatment, recording performance data into a salt bath heat treatment database, and continuing to enrich a performance model; according to the method, the production organization mode of traditional off-line salt bath heat treatment is eliminated, and stable control over the quality of the salt bath heat treatment wires is achieved.

The invention relates to a bearing ring bainite quenching method, and belongs to the technical field of bearing heat treatment. The bainite quenching method for the bearing ring comprises the following steps that firstly, the bearing ring is subjected to quenching heating treatment at the temperature of 870-880 DEG C, then the bearing ring obtained after quenching heating treatment is placed in a salt bath to be subjected to quenching cooling treatment and isothermal treatment in sequence, and finally the bearing ring obtained after isothermal treatment is taken out of the salt bath to be subjected to tempering treatment. The temperature of the quenching cooling treatment is 205-235 DEG C, the temperature of the isothermal treatment is 230-245 DEG C, and the temperature of the tempering treatment is 230-240 DEG C. According to the bainite quenching method for the bearing ring, the content of retained austenite in the bearing ring can be effectively reduced, the grain size is refined, and the hardness of the bearing ring is improved.

The invention relates to a medium-thickness plate salt bath quenching partition heat treatment test system and method, and the medium-thickness plate salt bath quenching partition heat treatment test system comprises a low-temperature molten salt furnace, a medium-temperature molten salt furnace, a heating water tank, a spraying bin, a high-temperature and high-pressure air supply system, a sample clamping and moving device, a cantilever crane and a control system; the method is used for realizing salt bath Qamp of the medium-thickness plate; p, carrying out a spray quenching and soaking partition heat treatment experiment, and obtaining related experiment parameters and temperature curves; isothermal quenching cooling of the high-temperature steel plate is realized by spraying low-temperature molten salt (150-300 DEG C), isothermal partition heat treatment is performed on the steel plate by adopting medium-temperature molten salt (300-500 DEG C), the steel plate is cooled by adopting hot water, and residual molten salt on the surface of the steel plate is cleaned; through cooperation of component design and a production process, the consistency of structure transformation paths in the steel plate core and surface layer cooling process is guaranteed, and the overall performance of the steel plate is further improved.

The invention provides a gradient martensite-bainite complex-phase structure construction forming manufacturing method for a high-carbon steel bearing under an extreme working condition, and relates to the technical field of bearing manufacturing. The method comprises the steps that the target carbonitriding temperature is determined according to the first target carbon potential of a workpiece to be machined, the target carbonitriding time is determined according to the target carbonitriding layer depth, and carbonitriding is conducted on the rolled workpiece to be machined according to the target carbonitriding temperature and the target carbonitriding time; the target austenitizing temperature is determined according to the second target carbon potential of the carbonitriding furnace, the to-be-machined workpiece subjected to carbonitriding treatment is put into a high-temperature box-type furnace, and austenitizing is conducted on the to-be-machined workpiece subjected to carbonitriding treatment according to the target austenitizing temperature; and the target isothermal quenching temperature is determined according to the second target carbon potential in the carbonitriding furnace, and the austenitized to-be-machined workpiece is immersed into a low-temperature salt bath furnace according to the target isothermal quenching temperature for isothermal quenching. The wear resistance, strength and toughness of the bearing can be improved.

The invention relates to the technical field of metal heat treatment, in particular to a silicon alloy steel bearing ring high-temperature salt bath quenching process for a high-temperature load environment, which comprises the following steps: S1, carrying out surface sand blasting treatment on a silicon alloy steel bearing ring; s2, stepped heating-heat preservation-cooling treatment is carried out, and the uniformly austenitized ferrule is obtained; s3, the uniformly austenitized ferrule is immersed in a composite salt bath; s4, staged cooling treatment of an air cooling stage and an oil cooling stage is conducted in sequence; s5, the martensite matrix ferrule is subjected to subzero treatment and staged heating; and S6, multi-stage tempering treatment with different temperature gradients is conducted, and the final high-temperature bearing ring is obtained. Through the combined process of stepped austenitizing, composite salt bath ultrasonic quenching, graded cooling, deep cooling and multi-stage tempering, homogenization and stabilization of the structure of the bearing ring are achieved, and the dimensional stability and the tempering resistance of the bearing ring in the high-temperature load environment are improved.

The utility model relates to the technical field of metal salt bath nitriding treatment equipment, and provides a cast iron pan nitriding treatment pan hanging device which comprises a plurality of annular frames and a center frame, the center frame is fixed in the annular frames, supporting rods are fixed at the bottoms of the annular frames, and supporting moving assemblies are arranged at the lower ends of the supporting rods. The hanging pot pressing assembly is arranged at the bottom of the center frame and comprises a bottom cavity, the bottom cavity is formed in the bottom of the center frame, a center rod is movably connected in the bottom cavity in a sleeved mode, and a dispersing frame is arranged at the top of the center rod. According to the technical scheme, the problems that in the prior art, due to the fact that all parts of a simple pot hanging support are unstable in structure and cannot bear excessive weight, the machining number of cast iron pot blanks is limited during salt bath nitriding every time, the production schedule is affected, the cast iron pot blanks are prone to distortion and deformation when being overweight, and the production efficiency is affected are solved. The production cost is increased due to incapability of continuous use, the firm fixing effect on the cast iron pan is poor, and the cast iron pan is easy to fall off in the process.

The invention provides an isothermal salt bath heat treatment production method for improving the structure uniformity of a bearing steel wire rod, which comprises the following steps of: performing shot blasting, flaw detection and coping on a continuous casting blank, rolling, adopting a one-heating forming process, controlling the heating temperature to be 1100-1250 DEG C, keeping the temperature for 1-3 hours, starting rolling, controlling the process temperature and the spinning temperature to be 780-870 DEG C, and after spinning, performing heat preservation for 1-3 hours. And salt bath controlled cooling is adopted, the salt bath temperature is 535-600 DEG C, the wire rod enters a heat preservation cover to be slowly cooled after being taken out of the salt bath, and the wire rod is rolled and air-cooled to the room temperature after being taken out of the cover. The molten nitrate is adopted as a cooling medium, the cooling speed of a high-temperature area is higher, especially for large-specification wires, an excellent quenching structure can be obtained, the cooling uniformity and stability are guaranteed, the temperature of the molten salt can be adjusted according to different specifications of the bearing steel wires to control the cooling speed, and therefore the cooling speed of the bearing steel wires is adjusted. And cooling is performed in an immersion manner, so that the cleaning uniformity of the wire rod is obviously superior to that of an air-cooled wire rod.

The invention relates to the technical field of ion sieves, and provides an ion sieve for salt bath purification as well as a preparation method and a use method of the ion sieve. The ion sieve comprises the following components in percentage by mole of oxide: 45.0-64.0 mol% of SiO2; the content of Al2O3 is 2.0 to 16.0 mol%; the Na2O accounts for 34.0 to 45.0 mol%; 0 to 3.0 mol% of ZrO2; 0 to 2.0 mol% of Y2O3; wherein after the ion sieve is subjected to lithium ion absorption for 0.5-24 hours in a salt bath at the temperature of 350-550 DEG C, the crystal form of the ion sieve does not change. According to the method, the ion sieve is controlled to be in the salt bath at the temperature of 350-550 DEG C, and after the ion sieve is subjected to lithium ion absorption for 0.5-24 hours, crystal transformation does not occur, so that after the ion sieve is used in the salt bath, fragments do not fall off, the salt bath is not polluted, and the situation that the fragments are attached to the surface of tempered glass to affect the appearance quality of the tempered glass is avoided. By controlling the mesh size of the mesh container of the composite salt bath additive to be 0.15 mm or above, the composite salt bath additive does not affect the adsorption effect of the ion sieve on salt bath purification, and the adsorption efficiency on lithium ions is high; the influence of the ion sieve on the appearance quality of the tempered glass can be prevented.

The invention discloses an impurity removal agent for a glass strengthening salt bath and an application method of the impurity removal agent, and the impurity removal agent is prepared from the following components in percentage by mass: 20-75% of silicon oxide, 10-30% of aluminum oxide, 10-40% of sodium oxide and 0.5-50% of calcium oxide. The impurity removal agent can effectively reduce the concentration of P ions in molten salt, the effect is improved along with the increase of the impurity removal agent, the linear law is met, and every 300 g of the impurity removal agent can absorb about 50 ppm of P ions. Experiments prove that after a glass product is strengthened in a salt bath treated by the impurity removal agent disclosed by the invention, the surface of the glass has no undesirable phenomena such as concave and convex points.

The invention discloses a method for preparing bainite steel through multi-element microalloying, and belongs to the technical field of advanced steel and iron materials. The method comprises the following steps that a forged steel ingot is subjected to first austenitizing and cooling treatment, and a martensite matrix is obtained; and then secondary phase precipitation treatment, secondary austenitizing treatment and cooling are sequentially carried out, and the bainite steel is prepared. According to the invention, an innovative heat treatment process path of martensite initial structure-medium-temperature second phase precipitation-short-time austenitizing-salt bath isothermal bainite transformation is constructed, and the synergistic effect of microalloy elements such as V, Nb, Ti and B is combined, so that the heat treatment process has the advantages that the heat treatment efficiency is greatly improved on the premise of not depending on precious alloy elements such as Cr and Ni; and the superfine bainite steel which is uniform in structure and excellent in comprehensive performance is successfully prepared.

The invention relates to a steel wire rod for a non-quenched and tempered fastener, a production method of the steel wire rod and the fastener, and the steel wire rod is characterized in that through component design, an element B is added on the basis of strengthening elements such as carbon, silicon and manganese, so that excellent hardenability and plasticity of steel are guaranteed; the tensile strength of the steel wire rod obtained through the production process of converter smelting, LF refining, bloom continuous casting, cogging, steel wire rod rolling and offline salt bath of the steel wire rod is 1050-1250 MPa, and the percentage reduction of area is 65-70%; the steel wire rod is subjected to drawing and cold heading to produce the fastener, thermal refining can be omitted, the technical requirements of the 12.9-grade fastener can be met, and the production cost and the carbon emission are effectively reduced.

The invention relates to a method for preparing a super-thick compact infiltrated layer through interface reactivation type cyclic nitridation, and aims to solve the problems that an infiltrated layer obtained through existing salt bath nitridation treatment is insufficient in thickness and poor in performance. The method for preparing the super-thick compact infiltrated layer comprises the following steps: 1, putting a preheated workpiece in a nitriding furnace into a molten salt bath medium, and carrying out salt bath nitriding treatment at the temperature of 380-650 DEG C; 2, carrying out layer removal treatment through stress-assisted surface subtractive machining to remove a surface compound layer of the workpiece; thirdly, the salt bath nitriding treatment and the layer removing treatment are repeated for multiple times; and 4, carrying out surface ultrasonic rolling post-treatment on the workpiece subjected to circulating salt bath nitriding. According to the method, a compound layer formed in the nitriding process is removed, the nitrogen atom diffusion driving force of subsequent nitriding treatment is enhanced, the nitrided layer subjected to circulating salt bath nitriding treatment has higher nitrogen concentration, the thicker nitrided layer is prepared, the depth and compactness of the nitrided layer of the metal workpiece can be remarkably improved, and the comprehensive performance of the nitrided layer is enhanced.

The invention belongs to the technical field of heat treatment, and particularly relates to a wind power planet wheel carburizing and quenching process, which comprises the following steps: carrying out temperature equalization treatment twice before carburizing, carrying out strong carburizing once and diffusion treatment twice in a carburizing stage, quickly cooling to a high return temperature, carrying out temperature equalization, entering a slow cooling pit, cooling to a certain temperature, discharging from a furnace, and carrying out air cooling. Preheating in a tempering furnace before quenching, entering the furnace at high temperature and high carbon potential, entering a salt bath for quenching after austenitizing, controlling the water content of the salt bath, and improving the quenching intensity. According to the method, it can be guaranteed that the temperature of a workpiece rises at a slow speed before carburizing, the thermal stress influence caused by too large temperature difference is avoided, carbon deposition is reduced through two-time diffusion, and it is guaranteed that the surface metallographic structure meets the technical requirement; preheating is conducted before quenching, high-temperature and high-carbon-potential furnace feeding is conducted, it is guaranteed that a workpiece is rapidly heated in a nucleation temperature interval, and a good martensite structure is obtained; by controlling the water content of the salt bath, the quenching cooling speed can be increased, the formation of a bainite structure is reduced, and meanwhile, the requirement of the wind power planet wheel for the inner hole hardness is met.

The invention relates to a non-quenched and tempered 10.9-grade high-strength cold heading steel wire rod with low cost and high structure stability and a preparation method. The wire rod comprises the following chemical components in percentage by weight: 0.03-0.05% of C, less than or equal to 0.10% of Si, 1.2-1.7% of Mn, 0.4-0.6% of Cr, 0-0.04% of Nb, 0.004-0.008% of B, more than or equal to 0.020% of Als, less than or equal to 0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.010% of S and the balance of Fe and inevitable impurity elements. The cooling speed of the hot-rolled wire rod on the after-rolling air cooling roller way is precisely controlled, the structure of the hot-rolled wire rod is full-granular bainite, and the wire rod finished product has high strength and high plasticity and also has excellent low-temperature impact toughness; and the production process is simple, the production cost is greatly reduced compared with a high-cost production process adopting salt bath treatment / isothermal treatment, and large-scale and low-cost stable production can be realized.

The invention provides a manufacturing method of full-bainite medium-carbon-chromium cold forging steel with simplified fine wire machining, which comprises the following steps: firstly, manufacturing a hot-rolled wire rod of a full-bainite structure easy for downstream spheroidizing annealing, and then performing fine wire manufacturing by adopting a'one-ball and one-drawing 'process; the manufacturing method of the hot-rolled wire rod sequentially comprises the following steps of continuous casting billet heating, rough and medium rolling, pre-finish rolling, finish rolling, reducing and sizing, spinning and salt bath cooling line controlled cooling, the salt bath cooling line controlled cooling adopts a full-soaking mode, the wire rod runs along with a roller way, the salt bath temperature is 300-440 DEG C, the salt bath cooling time is 400-800 s, and the wire rod coiling temperature is lower than 300 DEG C. The spheroidizing level of the fine wire reaches the level of 6 under the condition that the medium-carbon-chromium cold forging steel adopts the one-ball and one-drawing process, and the manufacturing cost of the fine wire is reduced.

The invention relates to vanadium-niobium microalloyed steel for a shield tunneling machine cutterhead and a production method of the vanadium-niobium microalloyed steel, and belongs to the technical field of alloy steel preparation. The steel comprises the following chemical components in percentage by weight: 0.44%-0.49% of C, 1.4%-1.6% of Mo, 1.0%-1.4% of Si, 4.8%-5.2% of Cr, 0.4%-0.6% of Mn, 1.40%-1.70% of V + Nb and the balance of Fe and inevitable impurities. The method comprises the following steps: a, electric furnace smelting; b, refining outside a furnace; c, carrying out electroslag remelting to obtain a steel ingot; d, the steel ingot is subjected to element high-temperature uniform diffusion treatment; and e, combined modulation heat treatment. By optimizing alloy components, microelements niobium and vanadium are introduced to synergistically refine grains, and the high toughness index is shown after heat treatment. The problems that existing steel for the shield tunneling machine cutterhead is different in component, the heat treatment technology is complex, salt bath quenching and partitioning technologies are needed, and the technology for large-size cutters is difficult are solved.

The invention discloses a method for removing impurities in a glass strengthening salt bath, which comprises the following steps: preparing an additive from 20-60% by mass of SiO2, 10-40% by mass of Al2O3, 20-50% by mass of a first metal oxide and 0-30% by mass of other oxides, weighing the additive accounting for 1-2% of the mass of the glass strengthening salt to be removed, adding the additive into the glass strengthening salt to be removed, and reacting at 460-500 DEG C for 3-20 hours to obtain the impurities in the glass strengthening salt bath. The iron ions in the glass strengthening salt bath are removed. According to the method, Fe ions brought by the strengthening furnace and the sample holder in the salt bath can be effectively removed, so that the salt bath is recovered to be clean, and poor appearance caused by multiple concave and convex points is reduced. The problem that in the prior art, after salt bath pollution, a new salt bath material needs to be replaced is solved, and the production efficiency is improved; meanwhile, new salt bath materials are prevented from being input, and the production cost is reduced. And the additive can be quickly and conveniently taken out, so that the influence on the production efficiency is reduced.

The application relates to the technical field of bearing steel, in particular to a boronized bearing steel and a preparation method thereof. The boronized bearing steel comprises a base body and a boronized layer; the base body is 20CrNiMo steel and comprises the following components in percentage by weight: C 0.18-0.22wt%, Si 0.25-0.32wt%, Mn 0.75-0.83wt%, Cr 0.48-0.55wt%, Ni 0.50-0.70wt%, Mo 0.40-0.50wt%, V 0.18-0.21wt%, and the balance is Fe and inevitable impurities; the boronized layer is obtained through salt bath boronizing, the boronizing agent for the salt bath boronizing is mainly composed of Na2B4O7, Al and KCl, and the thickness of the boronized layer is 20-80 mu m. The application forms a boronized layer with a certain thickness on the surface of the base body through specific base body components and boronizing agents, and the surface hardness, wear resistance, strength and toughness of the bearing steel are significantly improved.

This invention relates to the field of salt bath quenching technology, specifically to a salt bath quenching furnace and quenching method. The salt bath quenching furnace includes a furnace body with a fixed plate on the furnace body. Below the fixed plate is a hanging basket assembly, which includes at least two annular support frames. The axis of each annular support frame extends vertically. Each annular support frame has the same shape and is composed of two circular wave rings. The interval between the two circular wave rings forms a circular wave slide for placing bearing steel balls. A toggle plate is correspondingly provided above each annular support frame. The fixed plate is also provided with a first driving mechanism and a second driving mechanism. The first driving mechanism can independently control the vertical movement of each annular support frame, thereby staggering the annular support frames vertically. The second driving mechanism can drive the toggle plate to rotate synchronously around the vertical axis, thereby causing the bearing steel balls to roll on the corresponding circular wave slide, improving the quenching quality of the bearing steel balls.

METHOD FOR TREATMENT OF AN IRON ALLOY PART TO IMPROVE ITS CORROSION RESISTANCE The present invention relates to a method for treating an iron alloy part (P) to improve its corrosion resistance and mechanical strength, comprising: - a nitriding or nitrocarburizing operation in a molten salt bath, forming a compound layer (1) on the part (P), followed by - a phosphating operation of the part (P) forming a phosphating layer (2) on the surface of the part, characterized in that the molten salt bath contains chlorides, and the phosphating operation is carried out in a phosphating bath containing zinc and / or manganese ions, and iron ions. Figure for the abstract: Fig. 1

The invention relates to a method for producing a rolling element bearing component (1), wherein: the rolling element bearing component (1) is formed from a rolling element bearing steel of the type 100CrMnSi6-4 or 100Cr6; the rolling element bearing component (1) is heated to form an austenitic microstructure and subsequently quenched in a hot salt bath to a first temperature of between 170°C and 200°C, such that a pearlitic and / or ferritic microstructure is present at least in a core region (8) of the rolling element bearing component (1); thereafter, the rolling element bearing component (1) is heated to at least a second temperature in the temperature range from 220°C to 280°C and held for at least 7 hours, forming a predominantly bainitic microstructure at a surface (7) of the rolling element bearing component (1). The invention also relates to a rolling bearing component (1) and to a rolling bearing (2).

Embodiments of the present disclosure relate to a salt bath system for strengthening glass articles, the salt bath system including: a salt bath defining a first interior volume bounded by at least one sidewall; a salt bath composition including an alkali metal salt disposed within the first interior volume; a containment device defining a second interior volume bounded by at least one sidewall and including a regeneration medium disposed within the second interior volume; and a circulation device disposed proximate an inlet of the containment device, the circulation device operative to circulate the salt bath composition through the containment device. A method for regenerating molten salt is also disclosed.

The invention relates to the technical field of piston rod treatment, and discloses a QPQ piston rod corrosion-resistant treatment device which comprises a frame body, a nitriding salt bath is fixedly connected to the interior of the left side of the frame body, a top plate is fixedly connected to the top of the frame body, and a direction adjusting mechanism is arranged on the left side wall of the top plate; and the direction adjusting mechanism comprises a protection box, two first motors, two first guide rails and two joint blocks, the right side wall of the protection box is fixedly connected to the left side wall of the top plate, and the bottoms of the two first motors are fixedly connected to the front side and the rear side of the interior of the protection box. By arranging the direction adjusting mechanism, the problems that the piston rod or equipment is damaged and the corrosion resistance is reduced can be solved, the front first sliding block and the rear first sliding block synchronously move under driving of the corresponding belts, and therefore the uniformity and consistency of the surface of the piston rod are effectively improved, manual intervention is reduced, the processing time is shortened, and the processing efficiency is improved. And the risk of misoperation is reduced.