374results about "Quenching agents" patented technology

One embodiment of the present invention provides a high-strength thin-wall API steel material having excellent deformation stability and a manufacturing method thereof, the thin-wall API steel material comprising, in weight %, C: 0.05-0.15 %, Si: 0.5 % or less (except 0 %), Mn: 0.5-2.5 %, Nb: 0.05 % or less (except 0 %), V: 0.004 % or less (except 0 %), Mo: 0.03-0.2 %, Cr: 0.1-0.3 %, P: 0.03 % or less (except 0 %), S: 0.015 % (except 0 %), Al: 0.05 % or less (except 0 %), N: 0.01 % or less (except 0 %), Fe and other inevitable impurities in a balance, and a microstructure comprising, in area %, 10-30 % of ferrite having an average grain size of 15-30 μm and a balance of bainite, the thin-wall API steel material comprising 3000 / μm 2 V-based precipitates below.

The application provides a corrosion-resistant super-large line energy welding steel plate and a production method thereof, relates to the technical field of alloys, and the steel plate adopts a corrosion-resistant alloying component system with composite addition of Ce, Sn and Cu. The addition of Ce can improve the corrosion resistance of the steel plate, and Ce is easy to combine with oxygen to generate spherical oxides and has the ability to induce the nucleation of intracrystalline acicular ferrite, thereby improving the welding performance of the steel plate. On the basis of the comprehensive design of chemical components, the process parameters of rolling and cooling processes are accurately controlled to obtain the corrosion-resistant super-large line energy welding steel plate with good comprehensive performance.

The invention belongs to the technical field of quenching oil, and discloses low-carbon steel quenching oil as well as a preparation method and application thereof, and the low-carbon steel quenching oil comprises the following components in percentage by mass: 88%-94% of base oil, 3%-7% of a cooling accelerant, 1.5%-2% of a dispersing agent, 0.5%-1.5% of a brightener and 1%-3% of a composite antioxidant, wherein the base oil comprises first base oil and second base oil in a mass ratio of 1: (1.8-2.2), the kinematic viscosity of the first base oil at 40 DEG C is 23 mm < 2 > / s-27 mm < 2 > / s, the kinematic viscosity of the second base oil at 40 DEG C is 86 mm < 2 > / s-90 mm < 2 > / s, and the flash points of the first base oil and the second base oil are both higher than 210 DEG C. According to the quenching oil, the industrial pain points that the cooling speed of traditional quenching oil is difficult to control, a workpiece is prone to deformation and cracking, and the performance is difficult to consider are precisely overcome, perfect balance of ultrahigh strength and excellent toughness is achieved on the basis that it is guaranteed that a material forms an ideal microstructure, and more reliable safety performance support is provided for an automobile anti-collision beam.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The invention relates to the technical field of steel rail shears, and discloses a heat treatment method of a multi-component alloy material for a movable steel rail shear tool, which comprises the following steps: sequentially carrying out solid solution pretreatment, spheroidizing annealing, austenitizing, nitrate bath quenching and tempering on a forge piece, the nitrate bath quenching condition comprises the steps that the austenitized forge piece is transferred into a first-section nitrate bath, the temperature interval of the first-section nitrate bath is Bs to Ms, the cooling gradient is 5-8 DEG C / min, then the austenitized forge piece is transferred into a second-section nitrate bath, the temperature interval of the second-section nitrate bath is Ms to Ms-(30-40) DEG C, the temperature gradient is 6-10 DEG C, and heat preservation is conducted for 8-15 min after each gradient is finished; according to the method, the impact toughness of the steel rail scissor tool under the condition of-40 DEG C can be remarkably improved, and the use reliability of the multi-element alloy material for the steel rail scissor tool in the alpine region is remarkably improved.

Disclosed are a low-silicon and low-carbon equivalent GPa grade multi-phase steel plate / steel strip and a manufacturing method therefor. The steel plate / steel strip comprises the following components in percentages by weight: 0.03-0.07% of C, 0.1-0.5% of Si, 1.7-2.0% of Mn, P≤0.02%, S≤0.01%, N≤0.01%, 0.01-0.05% of Al, 0.4-0.7% of Cr, 0.001-0.005% of B, and 0.07-0.15% of Ti, and also comprises one or both of 0.15-0.4% of Mo or 0.02-0.08% of Nb, with the balance being Fe and other inevitable impurities; and at the same time, the steel plate / steel strip satisfies: the content of available B*≥0.001, the content of available B*=B-[Ti-3.4N-1.2(C-Nb / 7.8)] / 22, CE<0.58, and CE=C+Mn / 6+(Cr+Mo+V) / 5+(Si+Ni+Cu) / 15. The steel plate has a tensile strength of ≥980 MPa and a yield strength of ≥780 MPa, and a hole expansion rate of >50% if an original hole is a punched hole or a hole expansion rate of >60% if the original hole is a reamed hole.

The invention relates to the technical field of metal material heat treatment, in particular to a metal lock body toughness strengthening heat treatment process, a metal lock body is low-carbon steel or medium-carbon steel, the carbon content is 0.12%-0.45%, and the metal lock body toughness strengthening heat treatment process comprises the steps that surface cleaning and stress pretreatment are sequentially conducted on the metal lock body; the treated metal lock body is placed in a heat treatment furnace, and segmented heating is conducted to the austenitizing temperature according to a preset heating curve; first-stage heat preservation is conducted in the austenitizing temperature interval, and then cooling is conducted to the bainite transformation temperature interval for second-stage heat preservation; after double-temperature-area heat preservation is completed, stepped cooling treatment is conducted on the metal lock body; and the cooled metal lock body is sequentially subjected to low-temperature tempering, shot blasting treatment and secondary tempering. Through surface cleaning, stress treatment, segmented heating, double-temperature-zone heat preservation, stepped cooling, low-temperature tempering, graded shot blasting and secondary tempering, lock body stress is fully released, structure defects are reduced, internal stress is slowly released, and toughness, strength and performance stability are improved.

An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) about 0.005-0.5% boron, about 1.2-1.8% carbon, about 0.7-1.5% vanadium, about 7-11% chromium, about 1-3.5% niobium, about 6-11% molybdenum, about 3-10% nickel and the balance including iron and incidental impurities. Alternatively, the Nb content can be replaced or combined with Ti, Zr, Hf and / or Ta such that 1%<(Ti+Zr+Nb+Hf+Ta)≦3.5. The alloy has improved hot hardness and high temperature compressive strength and is suitable for use in elevated temperature applications such as in diesel valve seat inserts.

The application discloses a kind of automobile structure steel with yield strength 1000MPa and above and its manufacturing method, its component weight percentage is as follows: C 0.15~0.23%;Si 0.12~0.5%;Mn 1.6~2.4%;B 0.001~0.004%;Al 0.01~0.04%;Cr;0.05~0.5%;Mo 0.15~0.5%;P≤0.015%;S≤0.005%;Rest contains Fe and other inevitable impurities, and need to satisfy the following relationship: the eigenvalue Bs of lower bainite formation rate=0.6~1.4, Bs=(Mo+B*100-Mn / 5) / C;Its microstructure lower bainite≥95%.The automobile structure steel of the application has yield strength≥1000MPa, tensile strength≥1180MPa, elongation≥7%, 180° bending performance d≤3.5T.The automobile structure steel obtained by the application not only has ultrahigh strength, but also has excellent forming performance, especially bending forming performance, and is especially suitable for manufacturing automobile chassis system parts.

Provided is an austenitic stainless steel having a predetermined chemical composition and satisfying [0.010 ≤ VER + TiER + NbER], [27.0 ≤ 1.13 (Ni - NiER) + (Cr - CrER) + 1.85 (Mo - MoER) + 1.79 (Nb - NbER) < 40.5], [NbER < 0.052], and [0.5 ≤ (Hv40 - Hvt / 2) / Hvt / 2].

Method of manufacturing a steel strip comprising the steps of: - casting a molten steel into a slab; - reheating the slab at a temperature of 1150°C or more for a time of 1 hour or more; - hot rolling the steel into a strip, preferably using an average F1 slab entry temperature of more than 1000°C; - coiling the hot rolled steel strip; - batch annealing the steel strip: - at a temperature in the intercritical range (i.e. between Ac1 and Ac3), preferably less than 700°C; - in a non-oxidizing and non-nitrogenizing atmosphere; - for a total annealing time of at least 5 hours, preferably at least 10 hours so as to obtain: a Mn enrichment in austenite such that the Mn content is at least 1.25 times the overall Mn content of the steel; and a C enrichment such that the C content is at least 1.2 times the overall C content of the steel; - cooling the steel after batch annealing in air, forced air or water quenching.

In order to subject a metal member to cooling under isothermal heat treatment, a salt-bath heat treatment apparatus 10 comprises: a salt bath tank 1 which accommodates a nitrate salt bath including a molten nitrate salt; a water addition device 2 to add water to the nitrate salt bath in the salt bath tank 1; a humidity detection device 5 comprising a humidity sensor 53a to output a signal corresponding to humidity caused by water vapor generated from the nitrate salt bath with water added by the water addition device 2; and a control device 100 configured to control the water addition device 2 to adjust an addition amount of water to the nitrate salt bath, based on the signal output from the humidity sensor 53a of the humidity detection device 5.

A method for thermal processing bullets to reduce adhesive stress, the method includes obtaining one or more bullets configured to be propelled down a gun barrel, disposing the one or more bullets within a chamber having a temperature gradient between ambient temperature and cryogenic temperature, the chamber having a plurality of temperature zones, moving the one or more bullets between the plurality of temperature zones of the chamber, and returning the one or more bullets to the ambient temperature to reduce adhesive stress between the bullets and the gun barrel.

The method for generating a steel sheet material prediction model according to the present application is a method for generating a steel sheet material prediction model in a steel sheet cooling device, the steel sheet cooling device including a water cooling device that cools a steel sheet by spraying cooling water on the heated steel sheet, and a temperature measuring device that measures the surface temperature of the steel sheet during cooling, wherein the method for generating a steel sheet material prediction model includes the step of generating a steel sheet material prediction model after the steel sheet passes through the cooling device by machine learning using a plurality of learning data sets that include, as input performance data, surface temperature information data sets including measured data of the surface temperature at a reference point set in advance on the steel sheet and measured data of the surface temperature at a reference point set based on the reference point, and, as output performance data, material information of the steel sheet after passing through the cooling device at a position corresponding to the reference point on the steel sheet corresponding to the input performance data.

The present disclosure provides a steel for glass lining with a yield strength of 345 MPa or more, comprising the following chemical elements in percentage by mass: C: 0.08 ~ 0.14%; Si: 0.16 ~ 0.30%, Mn: 0.80 ~ 1.20%, S: 0.001 ~ 0.015%, P≤0.02%, Al: 0.005 ~ 0.035%, RE: 0.0005 ~ 0.006%, Ti: 0.05 ~ 0.09%, V: 0.01 ~ 0.03%, 0<N≤0.004%, O: 0.001 ~ 0.005%, and at least one of Cu, Cr, Ni and Mo elements, wherein: 0<Cu≤0.08%, 0<Cr≤0.08%, 0<Ni≤0.04%, 0< Mo≤0.04%.

This invention discloses a process for improving the hardenability of wind turbine main shafts during heat treatment, comprising the following steps: heating 42CrMo4 steel ingots to 1180~1220℃ for forging, with a forging ratio ≥4; air-cooling the forgings to 650~700℃ for the first time before loading them into a furnace, holding them at 300~350℃, then raising them to 640~660℃ for a second holding, with the holding time determined by the effective thickness × 1.5min / mm, followed by cooling to room temperature; vertically loading the forgings into tooling and heating them to 8... The surface is held at 40~860℃ for 1.2~1.5 min / mm (effective thickness × 1.2~1.5 min / mm) until the surface temperature drops to 780~800℃. Then, it is quenched in PAG solution within 3 minutes of quenching. After quenching, it is transferred to a tempering furnace and heated to 300℃ at a rate of ≤80℃ / h, held, and then heated to 540~580℃ at a rate of ≤100℃ / h, held for 2.0~2.5 min / mm (effective thickness × 2.0~2.5 min / mm). After tempering, it is cooled at a rate of ≤50℃ / h. This invention refines grains and carbides through forging and upsetting processes, controls pearlite cluster size through normalizing, and improves cooling uniformity through a density-layered dual-medium system during quenching. This method is suitable for improving the hardenability of large cross-sections in high-power wind turbine main shafts.

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).

To provide a technology for suppressing scattering of laser light caused by cooling water when quenching a press-formed product.SOLUTION: A quenching method of a press-formed product having a first wall portion, a second wall portion intersecting the first wall portion, and a bent portion connecting the first wall portion and the second wall portion includes heating the bent portion by irradiating the bent portion with a laser beam, and cooling the heated bent portion by spraying water to the bent portion following the irradiation with the laser beam. The water spraying is performed in a state where a shielding member is disposed so as to separate a laser beam irradiation region and a water spraying region.SELECTED DRAWING: Figure 2

The invention discloses a composite additive for a water-soluble quenching medium and a preparation method of the composite additive. The composite additive is prepared from the following components in parts by weight: 10 to 20 parts of polyisobutene maleic anhydride, 7 to 20 parts of polyvinyl caprolactam, 1.5 to 3.5 parts of polyacrylamide, 5 to 9 parts of organic alcohol amine, 0.5 to 0.7 part of an antirust agent, 0.5 to 0.9 part of a bactericidal mildew preventive, 0.3 to 0.5 part of a de-foaming agent and 30 to 50 parts of water. The composite additive can be efficiently mixed and dissolved with a traditional water-soluble quenching medium, the water-soluble quenching medium is promoted to achieve control over the low-temperature cooling speed and the lower characteristic temperature in the quenching technological process, and therefore the application range of the water-soluble quenching medium is widened, the quality of a quenched workpiece is improved, and the service life of the workpiece is prolonged. The composite additive disclosed by the invention not only solves the problem of low characteristic temperature of the existing water-soluble quenching medium, but also can enable the water-soluble quenching medium to keep proper maximum cooling speed and high characteristic temperature, and finally shows the cooling performance close to that of quenching oil.

A steel sheet including: a chemical composition containing, by mass %, C: 0.12-0.40%, Si: 1.5% or less, Mn: more than 1.7% and 3.5% or less, P: 0.05% or less, S: 0.010% or less, sol. Al: 1.00% or less, N: 0.010% or less, Ti: 0.002-0.080%, and B: 0.0002-0.0050%, with the balance being Fe and inevitable impurities; a metallic structure in which an area ratio of martensite to an entire microstructure is 85% or more, and a ratio LS / LB satisfies a predetermined formula (1), where LS denotes a length of a sub-block boundary and LB denotes a length of a block boundary; and a tensile strength of 1310 MPa or more.

The invention discloses a quenching device and method for steel ball production, and relates to the technical field of steel ball quenching, in particular to a quenching device and method for steel ball production. The quenching device comprises a base bin, a first quenching barrel and a second quenching barrel are arranged on the upper surface of the base bin, and a plurality of spiral sliding groove plates connected end to end are sequentially arranged in the first quenching barrel from top to bottom; a plurality of spiral chute plates connected end to end and spiral plates arranged on the inner walls of the spiral chute plates are matched with the synergistic effect of first air passages on the inner bottom surfaces of the spiral chute plates and second air passages on the upper surfaces of the spiral plates, so that a stable gradient field of which the temperature is gradually reduced from top to bottom can be constructed and maintained in a first quenching barrel; the steel balls are gradually cooled from gentle to violent in the rolling process along the spiral path, sudden change of the cooling rate is effectively avoided, concentration and superposition of thermal stress and structural stress are fundamentally restrained, and therefore the quenching hardness uniformity, the size stability and the product percent of pass of the steel balls are remarkably improved.

The invention discloses ultrahigh-hardness and high-purity stainless steel forging equipment and process, and relates to the field of stainless steel forging.The ultrahigh-hardness and high-purity stainless steel forging equipment comprises a heating furnace and a rotary supporting seat, a first roller conveying belt and a second roller conveying belt are installed on the two sides of the heating furnace correspondingly, and a first door assembly is installed on one side of the heating furnace; a second door assembly is mounted on the other side of the heating furnace; the top of the rotary supporting base is rotationally connected with a cooling station, a hydraulic lifting rod is installed in the center of the top of the rotary supporting base, and an electric chuck is installed at the other end of the hydraulic lifting rod. According to the ultrahigh-hardness high-purity stainless steel forging equipment and process, the temperature control and cooling process is optimized, and the final mechanical property of a product is ensured. The heating resistance wire is accurately controlled through the mechanical thermostat, the heating temperature is stabilized within the accurate range of 1000 + / -20 DEG C, the heat preservation time is set according to the thickness of a workpiece, and reliable guarantee is provided for the austenitizing process.

The invention relates to the technical field of heat treatment processes, and provides a heat treatment method of a forge piece for a submarine flange, which comprises the following steps: carrying out first normalizing treatment, second normalizing treatment, quenching treatment and tempering treatment on the forge piece, according to the first normalizing treatment, the forging is heated to 700-720 DEG C at a first heating rate, heat preservation is conducted for 1-2 h, then the forging is heated to 850-870 DEG C at a second heating rate, heat preservation is conducted for 2-4 h, and then the forging is cooled to 280-300 DEG C; wherein the first heating rate is greater than the second heating rate, and the normalizing parameters of the first normalizing treatment and the second normalizing treatment are different. According to the technical scheme, the problem that the forge piece for the submarine flange in the related technology is insufficient in strength is solved.

The invention discloses a cooling control system and method for salt bath quenching of bearing parts, and relates to the technical field of bearing heat treatment, and the cooling control system comprises a miniature simulation body which is arranged in a salt bath tank and comprises a sealing sleeve, a thermocouple temperature sensor and an electric heating element, and the thermocouple temperature sensor and the electric heating element are sealed in the sealing sleeve; the electric heating element is configured to be capable of actively heating the micro simulation body to a preset target temperature, immediately stopping heating and naturally cooling; and the thermocouple temperature sensor is configured to acquire temperature data of the miniature simulation body in a natural cooling process in real time. According to the cooling control system and method, the quenching intensity of salt bath quenching can be dynamically monitored in real time, a cooling characteristic curve is automatically generated through collected temperature data, a special control model is constructed by utilizing a self-learning algorithm, finally, the water supplementing amount is automatically and accurately adjusted according to the technological requirements, and the water supplementing efficiency is improved. And the cooling rate of the bearing part is stabilized in an ideal range.

The invention relates to the technical field of automobile chassis and material forming, and provides steel for preparing an anti-torsion pull rod integrated piece and application of the steel. The medium-carbon low-alloy steel with specific components is adopted, the tensile strength and low-temperature toughness can be improved, quenching deformation is effectively reduced, and the possibility is provided for forging of the torsion-resistant pull rod integrated piece; and further through a specific hardening and tempering method, the tensile strength and low-temperature toughness of the steel can be further improved, quenching deformation is reduced, and therefore forging of the torsion-resistant pull rod integrated piece is achieved.

A pre-hardened steel plate for a mirror-surface mold, comprising elements as follows: C: 0.28 to 0.36%, Si: 0.50 to 0.80%, Mn: 1.20 to 1.50%, P ≤ 0.020%, S ≤ 0.010%, Cr: 1.30 to 1.80%, Mo: 0.30 to 0.50%, Ni: 0.65 to 0.90%, V: 0.15 to 0.30%, H ≤ 1.5 ppm, and the balance is Fe and inevitable impurities. A pre-hardened steel plate with high hardenability for a mirror-surface mold having is obtained by using a manufacturing method comprising subjecting continuous casting billets to processes such as rolling, offline slow cooling, normalizing and tempering heat treatments. The advantages of the manufacturing method lie in that the production efficiency of continuous casting is high, the manufacturing costs are low. When not quenched-and-tempered, the hardness of the steel plate having a thickness of 20-180 mm reaches 38-42 HRC, the hardness fluctuation of the entire thickness ≤ 2 HRC, and the level of flaw detection satisfies the requirement of of level I in GB / T2970.

Provided are a high-strength thin-gauge checkered steel plate / strip comprising the following chemical elements in weight percentages: C: ≤0.06%, Si: ≤0.5%, Mn: 0.4-1.7%, P≤0.04%, S≤0.007%, N: 0.004-0.010%, Als: <0.001%, B: 0.001-0.006%, Mn / S≥250, total oxygen [O]T: 0.007-0.020%; Cu: 0.1-0.6% and / or Sn: 0.005-0.04%; and a balance of Fe and other unavoidable impurities, and a manufacturing method thereof. The resultant steel roll can be used directly as hot-rolled checkered plate / strip, or as a finished checkered plate / strip after being cut and finished, and is widely applicable to the fields of architecture, mechanical production, automobile, bridges, transportation, ship building, etc.

An annealing device for a metal strip (2) advancing in the longitudinal direction, said device comprising, in sequence: at least one preheating section (17); at least one heating section (3); at least one temperature maintenance section (4); at least one cooling section (23); wherein said at least one preheating section (17) comprises a plurality of heating rollers (16) for advancing said metal strip (2); wherein said at least one cooling section (23) comprises a plurality of cooling rollers (22) for advancing said metal strip (2), wherein a circuit of heat transfer fluid is provided, said circuit being configured to pass through the cooling rollers (22) of said at least one cooling section (23) in order to extract heat energy from the strip, thus obtaining a high-temperature heat transfer fluid, and through the heating rollers (16) of said at least one preheating section (17) in order to transfer heat energy to the strip, thus obtaining a low-temperature heat transfer fluid.

This traverse hardening device performs traverse hardening on a shaft-like body in which a large-diameter portion having a relatively large outer diameter and a small-diameter portion having a relatively small outer diameter are contiguous via a stepped portion, and comprises: a plurality of first coil sections arranged in a first position on a traverse central line, in an annular shape around the traverse central line; a plurality of second coil sections arranged in a second position different from the first position on the traverse central line, in an annular shape around the traverse central line; a first coil section driving unit that moves each of the first coil sections toward and away from the traverse central line; a second coil section driving unit that moves each of the second coil sections toward and away from the traverse central line; and a control unit that controls the first coil section driving unit and the second coil section driving unit.