69results about How to "Easy to smelt" patented technology

The present invention provides a dual phase steel sheet made up by using medium-thin sheet billet through a certain continuous-casting and continuous-rolling process. The component composition of said steel sheet includes (by wt%) 0.04%-0.11% of C, 0.02%-1.5% of Si, 0.6%-2.50% of Mn, 0.02%-2.0% of Cr, also can contain Mo or Ti, the rest is Fe and unavoidable impurity. The microscopic structure of said steel sheet includes: matrix phase is ferrite and second phase mainly is martensite. Besides, said invention also provides the concrete operation steps of its production method.

The invention discloses an alloy cast steel for a high speed train brake disc, a heat treatment method thereof and a high speed train brake disc manufactured by the alloy cast steel. The alloy cast steel is composed of the following components in percentage by weight: 0.18-0.26% of carbon, 0.16-0.50% of silicon, 0.55-1.40% of manganese, not larger than 0.03% of phosphorus, not larger than 0.03% of sulfur, 0.90-2.00% of chromium, 0.71-1.80% of nickel, 0.65-1.20% of molybdenum, 0.20-0.35% of vanadium, not larger than 0.30% of other components, smaller than 0.1% of tungsten and the balance of ferrum; and the heat treatment method comprises two steps of normalizing and tempering. The alloy cast steel disclosed by the invention has the beneficial effects that such alloy elements as manganese, nickel, chromium, molybdenum, vanadium, and the like, and such main components in the cast steel material as carbon, silicon and the like are reasonably mixed and are effectively thermally treated to refine the crystalline grain and improve the hardenability and heat resistant properties of the alloy cast steel material, and the normal temperature strength and the high temperature strength are greatly improved, so that the alloy cast steel material has excellent comprehensive mechanical properties. A brake disc manufactured by the alloy cast steel can meet the application requirements of high speed trains.

The invention provides a low-yield-ratio and high strength thick plate and a preparation process thereof. The thick plate comprises the following components in percentage by weight: 0.05-0.10 percent of C, 0.20-0.30 percent of Si, 1.60-1.80 percent of Mn, 0.05-0.07 percent of Nb, 0.30-0.40 percent of Ni, 0.30-0.40 percent of Cu, 0.15-0.30 percent of Cr, 0.20-0.40 percent of Mo, not more than 0.02 percent of Ti, not more than 0.045 percent of Al and the balance of iron and impurities. The preparation process adopts a rolling and cooling control process on the basis of the component design. The invention successfully solves the problems of contradiction and difficult accordancy of high strength and low yield ratio of a building thick plate, has simple process and wide application prospect, can effectively improve the yield and reduce the production cost and is suitable for industrialized large production and the fields of high-rise buildings, bridges, pipelines, and the like.

The invention belongs to the technical field of cold rolled steel and discloses zinc-plated double-phase steel and a production method of the zinc-plated double-phase steel. The zinc-plated double-phase steel comprises, by weight percentage, 0.085%-0.115% of C, 0.15%-0.24% of Si, 1.45%-1.55% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.025%-0.065% of Alt, 0.14%-0.24% of Cr, 0.24%-0.29% of Mo, not larger than 0.006% of N and the balance Fe and other inevitable impurities. The production method includes the steps of KR desulfuration, converter steelmaking, LF+RH refining treatment, RH calcium treatment, continuous steel casing, billet heating, rough rolling, finish rolling, laminar cooling and winding; unwinding, acid pickling, cold continuous rolling and winding; and unwinding, cleaning, annealing, zinc plating, finishing and winding. Through composition design and process control, the zinc-plated double-phase steel is suitable for annealing production lines having the rapid cooling segment or not.

The invention provides an alloy forged steel and its heat treatment method and use. The alloy forged steel comprises: by mass, 0.26 to 0.35% of C, 0.15 to 0.39% of Si, 0.85 to 1.50% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.80 to 2.00% of Cr, 0.70 to 2.00% of Ni, 0.35 to 1.00% of Mo, and the balance Fe and other elements. Through reasonable proportioning of alloy elements such as Mn, Ni, Cr and Mo, and main chemical components such as C and Si in forged steel materials, through appropriate heat treatment processes, grains are refined; hardenability and heat intensity properties of the alloy forged steel are improved; normal temperature strength and high temperature strength of the alloy forged steel are greatly improved; and excellent comprehensive mechanical properties of the alloy forged steel are obtained.

The invention discloses a method for leaching selenium in acid mud by using sodium sulfite. The method comprises the following steps: selenium-containing acid mud and industrial water are mixed into pulp, and the pulp is put into a stirring groove for water washing till the acid mud is neutral; the neutral acid mud is mixed with the sodium sulfite and the industrial water into pulp, the pulp is put into a high-pressure reactor, nitrogen is introduced for reaction, the pressure and the temperature are reduced after the reaction is finished, the material is taken out and filtered, and the filtrate is sodium selenate solution; the sodium selenate solution is put into an acidizing groove, and sulfuric acid is added under the stirring condition; after the acidification is finished, temperature rise is started, the mixture is continuously stirred and then filtered, and the filter residue is selenium powder with the content of more than or equal to 97.0%; the selenium is leached by using the industrial sodium sulfite in the process of extracting the selenium in the acid mud, and the leached selenium is acidized to obtain the selenium powder with the content of more than or equal to 97.0%; and sodium sulfate produced in the technical process is effectively recycled by a distillation and crystallization method. The method has the characteristics of low cost, easiness in industrialization and low-carbon environmental protection.

The invention discloses a high-strength anti-seismic steel bar. The steel bar comprises, by weight, 0.24-0.28% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, less than or equal to 0.040% of S, less than orequal to 0.040% of P, 0.120-0.160% of V, 0.010-0.030% of Nb, 0.0140-0.0220% of N, and the balance being Fe and inevitable impurities. The rolling process comprises the following steps: (1) preparingmaterials according to the components by weight; (2) preparing a steel billet of suitable size; (3) rolling, wherein heating temperature of the steel billet is 1000-1200 DEG C, soaking temperature is1150-1230 DEG C, and rolling temperature is 1100-1200 DEG C; and (4) treating on a cold bed for natural cooling after heating and rolling, and then carrying bundling and stacking. A steel bar alloy system is simple and is easy for blank smelting and continuous casting efficient production; precious alloys such as nickel and molybdenum are not adopted, the content of niobium and vanadium is low, and the product alloy cost is low; and the developed high-strength steel bar has excellent comprehensive performance and safety performance, the durability and the safety of key engineering buildings can be ensured, and the application and popularization prospects are good.

The invention provides a production technology of high purity silicon carbide, comprising the following steps of: mixing silicon dioxide and carbon black with the weight ratio of 1:1.2; preparing pulp from the mixture and sulfuric acid solution with the concentration of 60-80g/l according to the solid-liquid ratio of 1:4; putting the pulp in a pressurizing reactor; controlling the pressure in the reactor; stirring for 1-3h,and filtering to obtain mixing slag; washing the mixing slag to neutral; pelletizing the mixing slag, putting particles into an electric furnace; roasting the particles with the temperature of 1600 DEG C to 1800 DEG C; separating liquid and solid; cooling; crushing obtained silicon carbide; washing the crushed silicon carbide by sulfuric acid with the concentration of 80-120g/L; filtering, and drying to obtain the high purity silicon carbide with the impurity content less than 0.001 percent. The invention belongs to a smelting method for preparing the high purity silicon carbide by the silicon dioxide and the carbon black. After carrying out pressurization and acid leaching on the silicon dioxide and graphite, the electric furnace is utilized to roast, and the silicon dioxide and the graphite are separated, then the sulfuric acid is used to wash the silicon dioxide and the graphite to obtain the high purity silicon carbide. The invention has the advantages of simple equipment, short technological process, low production cost and environment protection.

The invention relates to Sn-Ag-Cu lead-free solder with oxidation resisting performance, and belongs to the manufacture technical field of lead-free solder for electronic assembly in microelectronics. The solder comprises the following components (mass percent): 0.1 percent to 5 percent is Ag, 0.1 percent to 1.5 percent is Cu, 0.01 percent to 1 percent is Ce, 0.01 percent to 0.5 percent is Ni, 0.0001 percent to 0.2 percent is P, or at the same time, 0.001 percent to 0.5 percent of Ge is added and the rest comprises Sn. The invention provides a method that microelements such as Ni, rare earth element CE, P, or at the same time Ge are added into the Sn-Ag-Cu solder alloy, the wet ability and the mechanical property of the alloy solder are further improved, and especially the oxidation resisting performance is greatly improved. The organism of the alloy solder of the invention is refined and uniform, no toxic element such as PB is included, the pollution to environment does not exist, the smelting is convenient, the invention can be processed into a great variety of production forms, the WEEE and RoHS instruction issued can be met, and the invention is the good low temperature lead-free solder.

The invention discloses a heat-resistant wear-resistant steel plate and a production method thereof. The heat-resistant wear-resistant steel plate consists of the following components in percentage byweight: 0.33%-0.40% of C, 0.2%-0.4% of Si, 0.80%-1.00% of Mn, 0.5-0.7% of Cr, 0.2-0.4% of Mo, 0.015%-0.03% of Nb, 0.0005-0.0022% of B, 0.10%-0.20% of Ti, 0.015%-0.045% of Als and the balance of Fe and inevitable impurities; and impurity elements in steel are controlled as follows: less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.0040% of [N] and less than or equal to 0.0020% of [O]. According to the heat-resistant wear-resistant steel plate and the production method thereof provided by the invention, the steel plate has surface hardness greater than HB400 after being tempered at a temperature lower than 500 DEG C; the production method is simple, and does not need special compound equipment; and residual stress is low, cracks are not liable togenerate, components are simple and common, and the cost is low.

The invention discloses a low-cost yield strength 400MPa-grade steel strip and a production method thereof. The steel strip contains the following components in percentage by weight: 0.18-0.22% of C, 0.20-0.40% of Mn, less than or equal to 0.020% of S, less than or equal to 0.025% of P, less than or equal to 0.03% of Si, 0.015-0.035% of Als, 0.0009-0.0030% of B and the balance being Fe and inevitable impurities. The steel strip, on the basis of low-silicon manganese and boron microalloying thinking, can reduce raw material cost, and can be produced through a thin slab casting and rolling process; thickness specification is 1.0-3.5mm; the steel strip has the characteristics of being simple to smelt, relatively low in cost, stable in physical performance and applicable to industrial mass production. The steel strip, by controlling smelting through low-silicon manganese and boron microalloying, reduces cost, improves utilization rate of lower equipment through continuous casting high pulling speed, reduces cost by directly charging a continuous casting slab, guarantees surface quality of product by controlling temperature of a heating furnace, and meets physical performance of the product by optimizing a hot rolling process; the steel strip has the characteristics of being simple in process, low in cost and applicable to industrial mass production.

The invention discloses alloy cast steel used for a high-speed train brake disc and the high-speed train brake disc manufactured through the alloy cast steel. The alloy cast steel in the claim 1 comprises, by weight percent, 0.18%-0.26% of carbon, 0.30%-0.50% of silicon, 0.68%-1.40% of manganese, smaller than or equal to 0.025% of phosphorus, smaller than or equal to 0.013% of sulfur, 1.10%-1.82% of chromium, 0.90%-1.50% of nickel, 0.65%-1.02% of molybdenum, 0.22%-0.34% of vanadium, smaller than or equal to 0.30% of the sum of the content of other components and the balance iron, wherein tungsten is smaller than 0.1%. The alloy cast steel has the main beneficial effects that grains are refined through reasonable matching and heat treatment of alloy elements such as manganese, nickel, chromium, molybdenum and vanadium and main components such as carbon and silicon in a cast steel material, hardenability and the thermal strength performance of the alloy cast steel material are improved, the constant-temperature strength and the high-temperature strength are greatly improved, and the good comprehensive mechanical property is achieved. The brake disc manufactured through the alloy cast steel can completely meet the technical requirement for use of high-speed trains under the working condition.

The RE containing SnZn-base lead-free brazing alloy for assembling in microelectronics contains Zn 5-9 wt%, Ag 0-1.5 wt%, Bi 3-5 wt% and marketable Er 0.05-1.0 wt% except Sn. The preparation process includes melting mixed salt of KCl and LiCl in the ratio of 1-1.6 to 0.8-1.2 and pouring the molten salt to Sn, melting Sn, adding Zn, Ag and Bi into Sn liquid to melt, pressing Er with holed bell jar into the mixed salt and SnZn-base alloy, rotating the bell jar, maintaining for 1-2 hr, stirring, letting stand and eliminating mixed salt in the surface after solidification. The brazing alloy has fined microscopic structure, low cost, no pollution, convenient smelting, and improved moistening technological performance and metallurgical quality.

The invention discloses a process for comprehensively utilizing vanadium-titanium magnetite through chain grate roasting, gas-based shaft furnace prereduction, and electric furnace deep reduction. Theprocess comprises the following steps: (1) oxidized pellet preparation: uniformly mixing vanadium-titanium magnetite concentrate, a binder and water in a ratio, pelletizing to obtain vanadium-titanium magnetite green pellets with qualified particle sizes, conveying the green pellets into a chain grate, and carrying out drying and oxidation roasting to obtain vanadium-titanium magnetite oxidized pellets; (2) gas-based shaft furnace prereduction; (3) electric furnace deep reduction: filing the vanadium-titanium magnetite prereduction pellets into an electric furnace and carrying out deep reduction, adding a flux and proportioned carbon, controlling a melting temperature to be 1550-1650 DEG C, and separating to obtain vanadium-containing molten iron and titanium-containing slag; and (4) using the obtained vanadium-containing molten iron for vanadium extraction in a converter, and carrying out titanium extraction on the titanium-containing slag through a sulfuric acid method. According tothe process, the reduction degradation rate for the oxidized pellets is greatly reduced, so that the requirement of the subsequent shaft furnace reduction can be met; and efficient and clean utilization for iron, vanadium and titanium is realized, and meanwhile, the cost is reduced, and the production efficiency is increased.

The invention relates to gray cast iron which is prepared by the following ingredients according to mass percent: 2.7 to 3.0 percent of C, 0.9 to 1.2 percent of Mn, 1 to 1.5 percent of Ni, 0.3 to 0.5 percent of Cr, 0.3 to 0.5 percent of Sn, 1.6 to 2.0 percent of core-spun yarns, not higher than 0.1 percent of P, not higher than 0.1 percent of S, and the balance ofiron and inevitable impurities. Powdery inner cores of the core-spun yarns contain light rare earth. Through the reasonable regulation of the proportioning of raw materials of the gray cast iron and the addition of inoculation, the strength and hardness of the gray cast iron are obviously improved. The gray cast iron is convenient in smelting and outstanding in casting property. After inoculation, the cast iron piece cannot be easily fractured. The gray cast iron casting smelted by the current materials has obviously-improved pressure resistant strength and hardness, lowers the production cost of the enterprise, increases the qualification rate of the product, enlarges the application scope of the casting, and has obvious economic benefits.

The invention relates to a carbon blowing technique for electric furnace smelting. The method comprises the following steps: a. filling carbon powder: screening carbon powder to obtain carbon powder of which the granularity phi is at most 3mm, the water content is at most 3% and the sulfur content is at most 2.5%, and filling the screened carbon powder in a supplementary blowing machine (1); b. adjusting pressure of compressed air: respectively adjusting the pressure of the supplementary blowing machine (1) and the pressure of the self-consumption carbon blowing gun (3) to 0.2-0.3 MPa; c. opening a carbon powder baiting valve of the supplementary blowing machine; d. inserting the self-consumption carbon blowing gun (3) into molten steel of an electric arc furnace melting bath (4) via a furnace slag layer (5); and e. electric arc furnace smelting by charging three times: when the temperature of the melting bath is increased, melting down scrap steel, starting the supplementary blowing machine to blow the carbon powder into the melting bath three minutes a time, and tapping after the steel meets the chemical composition requirement for steel grade Q235 and achieve the tapping conditions. The invention can save electric energy, increases the steel scrap recovery rate, is simple to operate, and has the advantages of simple equipment and strong feasibility. By adopting the carbon blowing technique, the electricity can be saved by 30 KWH per ton of steel, and the steel scrap recovery rate can be increased by more than 1%, the comprehensive economic benefit per ton of steel is more than 50 Yuan. If the technique is used for electric furnace smelting all over China, 10 billion Yuan can be saved every year.

The invention relates to an endogenous Cu6Sn5 particulate reinforced tin and silver based lead-free composite solder alloy and the preparation method, belonging to the technical field of manufacturing lead-free solder for electronic assembly in the microelectronic industry. The composite solder prepared by a traditional endogenous method has uneven distribution of the endogenous particles, and the technology and mechanical property of solder are influenced. The composite solder of the invention is composed of Cu6Sn5 reinforced particles and the eutectic alloy of Sn-3.5Ag; the volume percentages of the two components are respectively 20 percent and 80 percent. The invention is characterized in that potassium chloride and lithium chloride are mixed and melted according to the weight percentage of 1.3:1, and then poured on the eutectic alloy of Sn-3.5Ag; when the eutectic alloy of Sn-3.5Ag is melted, Cu and Sn particles are added; the mixture is preserved at the temperature of 450 DEG C, stirred and staying silently; then the mixture is rapidly cooled to room temperature at a rate of 20, 2, 0.6 or 0.1 DEG C/sec; the complex solder of the invention is obtained by removing mixed salt. The complex solder of the invention has the advantages of low cost, convenient smelting, and good mechanical property and creep resistance.

The invention discloses a permeable dry stamp mass for the furnace bottom of an intermediate frequency furnace. The permeable dry stamp mass is a uniform mixture of 89 percent by weight of refractory aggregate and 11 percent by weight of additive. The permeable dry stamp mass disclosed by the invention is stamped in an area with a diameter being 300-400mm and with an air brick as the center at a top of the air brick, wherein a stamping thickness is 100-250mm; and the whole furnace bottom can be stamped according to the size of the furnace body and a stamping thickness is 100-250mm. Compared with the prior art, a permeable stamp mass is stamped at the top of the air brick, so that the air brick is prevented from directly bearing the corrosion of liquid steel and the service life of the air brick is prolonged. The permeable dry stamp mass disclosed by the invention has the advantages of stable permeable performance, no blockage of an electric furnace subjected to stamping, easy operation, safe smelting and freeness of breakout accidents.

The invention discloses solid smelting pretreatment equipment comprising an installing base. A smelting box is fixedly connected to the upper surface of the installing base. The inner bottom wall of the smelting box is provided with a discharge outlet. The upper surface of the installing base is provided with a heating cavity. An electric heating wire is fixedly installed on the inner wall of theheating cavity. Through the solid smelting pretreatment equipment, the effect of primary crushing of solid smelting materials is achieved, the smelting materials are crushed into small shapes and small sizes after crushed by primary crushing teeth, smelting is convenient, the shapes and sizes of the smelting materials are further limited, and smelting is convenient. The smelting materials can be effectively crushed by the rectangular-pyramid-shaped primary crushing teeth and advanced crushing teeth, a crushing rotor can be located rotationally, the shake problem caused by too large stress on the crushing rotor during rotary crushing is avoided, and thus the problems that smelting efficiency is liable to be lowered due to different shapes and sizes of solid smelting objects are solved effectively.

The invention discloses a vacuum regenerative and reduction furnace system for metal smelting, which comprises a reduction furnace (1), a reduction kettle (2), a regenerative burning system and a liquid-state metal collection system. The reduction kettle with a bevel bottom structure is provided with a radiation pipe (3) penetrating in the reduction kettle and is arranged at the middle section of the reduction furnace to divide the reduction furnace into an upper or a left combustion chamber (4) and a lower or a right combustion chamber (5), and the two combustion chambers are communicated with each other through the radiation pipe (3), so that the hot smoke in the combustion chambers can pass through the radiation pipe (3). The two combustion chambers are respectively connected with each other a regenerative combustion system, which is used for storing the heat of smoke discharged from the reduction furnace after heating materials through the radiation pipe and for controlling the alternate combustion of the combustion chambers and the flow direction of the high-temperature gas in the radiation pipe. A reduction material in the reduction kettle produces a metal vapor after reduction reaction, and the metal vapor is collected by the liquid-state metal collection system and is directly cast or conveyed to a refining furnace. The invention has the advantages of high heat utilization rate, good power saving effect, complete combustion and short reduction reaction time.