60results about How to "Raise the finishing temperature" patented technology

The invention discloses free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod. The microstructure of the free-cutting medium-carbon non-quenching and tempering steel comprises ferrite and pearlite; the free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod comprises chemical elements according to mass percents: 0.2-0.55 % of C, 0.35-1.00 % of Si, 0.5-1.70 % of Mn, 0.01-0.09 % of S, 0.03-0.15 % of P, 0.05-0.50 % of Cr, 0.05-0.45 % of V, 0.005-0.030% of N, and the balance Fe and other inevitable impurities. The free-cutting medium-carbon non-quenching and tempering steel for a fracture splitting connecting rod has relatively high intensity; in addition, the steel material disclosed by the invention has excellent cutting machinability and good brittleness splitting decomposition performance, and is suitable for a connecting rod processing technology.

The invention discloses a method for producing a 65Mn hot rolled steel plate, which comprises the steps of smelting, refining, thin slab casting, soaking, high pressure water descaling, hot continuous rolling, cooling and reeling based on the process of thin slab casting and rolling. The molten steel superheat temperature is T superheat (30 DEG C <T superheat </= 45 DEG C), the charging temperature of casting blanks is T charging (900 DEG C </= T charging </= 1050 DEG C), the final rolling temperature is T final (850 DEG C </= T final </= 950 DEG C), the reeling temperature is T reeling ( 550 DEG C </= T reeling </= 650 DEG C), the liquid core pressure of casting blanks is L pressure (2 </= L pressure </= 20mm), and the depth of a single-surface decarburized layer is 0.3 to 0.9 percent of the depth of the steel plate. The chemical constitutes of molten steel after being alloyed in a refining process comprise 0.62-0.70 wt.% of C, 0.17-0.37 wt.% of Si, 0.90-1.20 wt.% of Mn, less than or equal to 0.035 wt.% of P, less than or equal to 0.035 wt.% of S, less than or equal to 0.25 wt.% of Cr, less than or equal to 0.25 wt.% of Ni and the balance of Fe and inevitable impurities. The 65Mn hot rolled steel plate produced in the method has the characteristics of uniform structure property, high thermal stability and high strength, and the quality of the 65Mn hot-rolled steel plate is obviously improved.

The invention discloses a manufacturing method for easily pickled steel with a low yield ratio by thin slab casting and rolling. The method comprises the steps of molten iron desulfurizing, converter smelting, refining, thin slab continuous casting, slab soaking, hot continuous rolling, laminar cooling, coiling and air-cooling, wherein the slab soaking temperature is 1160 DEG C to 1200 DEG C; finish rolling is directly carried out for seven times in the hot continuous rolling process, and screw-down rate for the seven times is as follows in sequence: 50-60%, 50-60%, 52-58%, 45-50%, 20-25%, 13-18% and 9-13%; the final rolling temperature is 870 DEG C to 890 DEG C; the temperature after laminar cooling is 580 DEG C to 610 DEG C; and the components of the slag are as follows in percentages by weight: 0.045-0.065% of C, not more than 0.05% of Si, 0.40-0.60% of Mn, not more than 0.015% of P, not more than 0.010% of S, and the balance of iron and inevitable impurities. According to the manufacturing method disclosed by the invention, the yield ratio of the easily pickled steel is effectively reduced without the addition of extra noble alloy elements.

The invention provides a production method of a high-strength saw bit steel coil. The production method is suitable for a rolled steel coil of saw bit or saw blade steel with the thickness of 3.0-14.0mm. The component design comprises 0.49-0.52 of C, 0.2-0.35 of Si, 1.45-1.60 of Mn, less than or equal to 0.015 of P, less than or equal to 0.005 of S, 0.2-0.25 of Cr, 0.12-0.16 of V, 0.020-0.025 of Al and less than or equal to 0.006 of N by weight percent. The production process adopts a converter smelting-LF (ladle furnace) refining-hot continuous rolling process and comprises slab continuous casting and segregation control in saw bit steel production, control of the slab continuous offline slow cooling temperature of the saw bit steel and the control of the roll rolling start temperature, the rolling finished temperature and the coiling temperature. The horizontal yield of the saw bit steel coil is MPa600-750, the horizontal tensile strength is MPa930-1040, the elongation is 19.5-26%, and the hardness of HRC is 20-28.

The invention discloses a non-annealed cold forging steel hot-rolled wire rod and a production method thereof. The method comprises the steps of continuous casting, heating, rolling, spinning and cooling. The non-annealed cold forging steel hot-rolled wire rod comprises 0.29-0.38wt% of C, 0.15-0.30wt% of Si, 0.70-0.90wt% of Mn, 0.03wt% or less of P, 0.03wt% or less of S, 0.30wt% or less of Cr, 0.0008-0.0050wt% of B, and the balance of Fe and residual elements. In the heating step, continuous cast billets are heated to 1100-1190DEG C; in the rolling step, the initial finish rolling temperature is 965-995DEG C; in the spinning step, the spinning temperature is 960-990DEG C; and in the cooling step, the cooling speed is 0.5-1.5DEG C/s. The method realizes production of the non-annealed cold forging steel hot-rolled wire rod through optimally designing chemical components, controlling the heating temperature, the initial finish rolling temperature, the spinning temperature and the cooling speed and controlling the amount and the grain size of ferrite by using present devices and technologies without increasing investment or production cost, so the non-annealing production and cost reduction demands of downstream users are met, and pollution of annealing to environment is avoided.

The invention relates to the technical field of hot-rolled ribbed steel bars, and discloses steel for a 635 MPa level high-strength hot-rolled steel bar. The steel is prepared from, by weight, 0.22-0.30% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, not larger than 0.025% of P, not larger than 0.025% of S, 0.015-0.035% of Nb, 0.105-0.145% of V, 0.15-0.35% of Cr, 0.018-0.025% of N and the balance Fe. According to the steel for the 635 MPa level high-strength hot-rolled steel bar and a machining method thereof, by adopting C, C is a cheap element, the strength of the steel can be remarkably improved, the extension performance of the steel can be lowered, meanwhile, the cold brittleness and aging sensitivity of the steel are improved, the integrated ingredients are reasonable, the comprehensive performance of the whole steel is improved, the stability of the steel performance is enhanced, the overall performance of the steel on the aspects of yield strength, tensile strength, the high yield ratio, the percentage elongation after fracture, the total elongation percentage under the maximum force and the like is good, meanwhile, the steel metallographic structure is ferrite+pearlite, the granularity is 11.5, the good fatigue resistance is achieved, the steel is suitable for large-scale industrial production, and benefits are remarkable.

The invention relates to a blade ring forged piece and a fabrication technology thereof. The fabrication technology comprises the following steps: 1, preparing materials; 2, cogging and forging, including heating, forging, and annealing; 3, baiting, and removing head and tail of a steel ingot; 4, molding and forging, including heating, forming, rolling and annealing; 5, carrying out thermal treatment, including normalizing, tempering for the first time, quenching, tempering for the second time, and tempering for the third time; 6, carrying out ultrasonic flaw detection; 7, carrying out physical and chemical testing; 8, carrying out finish machining; 9, packaging products. Thus, the blade ring forged piece obtains a good fine grain microstructure and high-temperature endurance property, and simultaneously has good tensile strength and yield strength.

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a preparation process of a high-strength 7150 aluminum alloy medium plate. Raw material ingredients comprise: Si <= 0.50%, Fe <= 0.50%, Cu: 2.10-2.20%, Mn <= 0.01%, Mg: 2.15-2.35%, Cr <= 0.02%, Zn <= 6.65%, Ti <= 0.03%, Zr: 0.10-0.12%, single impurity <= 0.01%, total <= 0.15%, and the balance Al. The product formulation and casting process are optimized, the homogenization system is improved, initial rolling temperature is improved, high rolling-reduction rolling is adopted, the solid solution processis optimized, quenching delay time is strictly controlled, the quenching speed is improved, stretching delay time is strictly controlled, the optimal amount of stretching is selected, the aging process is improved, and finally the 7150 medium plate with excellent properties is obtained.

The invention provides high-ductility FH500-grade ship plate steel and a preparation method thereof, and belongs to the technical field of metallurgy. The components of the ship plate steel are as follows in percentage by weight: 0.04-0.08% of C, 0.04-0.16% of Si, 1.20-1.40% of Mn, 0.03-0.04% of Nb, 0.01-0.02% of Ti, 0.02-0.04% of Als, less than or equal to 0.02% of P, less than or equal to 0.01%of S and the balance of Fe and inevitable impurities; the preparation method of the FH500-grade ship plate steel comprises the steps that billet steel with the thickness of 120-140 mm is adopted for being subjected to heating, thermal insulation, rough rolling, finish rolling and cooling to obtain the finished-product ship plate steel. According to the high-ductility FH500-grade ship plate steel and the preparation method thereof, by adopting a controlled rolling and controlled cooling technology, the ship plate steel with the texture including soft-phase ferrite and hard-phase bainite is obtained; moreover, elements such as Cr, Ni and Mo are not added, so that the cost is low; through a fast cooling method, the finishing temperature can be properly improved, the rolling mill load can be reduced, the rolling efficiency can be improved, and production, which is low in cost, easy to conduct rolling and high in efficiency, of the high-ductility FH500-grade ship plate steel is achieved.

The invention belongs to the technical field of production of hot rolling strip steel, and in particular relates to a hot rolling heating method for a low-carbon aluminum killed steel casting blank. The invention aims to solve the technical problem of providing a hot rolling heating method for the low-carbon aluminum killed steel casting blank, and the hot rolling heating method has low heating temperature and short heating time. To solve the technical problem, the invention uses the technical scheme that the temperature of a preheating section of a heating furnace is 1050-1150 DEG C, the temperature of a heating section is 1185-1230 DEG C, the temperature of a holding section is 1160-1200 DEG C, and the heating time of the heating furnace is 135-147min. By adopting the method of the invention for heating the low-carbon aluminum killed steel casting blank, the uniformity of the heating temperature of the low-carbon aluminum killed steel can be improved, the rolling process requirement is met, the heating temperature of the low-carbon aluminum killed steel casting blank is reduced by 40 DEG C averagely, low temperature heating is realized, the heating time is reduced by 10 minutes averagely, the yield and the heating quality of the heating furnace are improved, the fuel consumption of the heating furnace is reduced, and the comprehensive effects of increasing yield, guaranteeing quality, saving energy and reducing consumption are obtained.

The invention discloses large-section H-shaped steel and a production process thereof. The large-section H-shaped steel comprises the following chemical components in percentage by mass: 0.08-0.13% ofcarbon, 0.15-0.35% of silicon, 1.25-1.45% of manganese, 0.10-0.20% of vanadium, nitrogen not more than 0.012%, phosphorus not more than 0.01%, sulfur not more than 0.010%, 0.03-0.05% of niobium, 0.03-0.05% of thallium, 0.03-0.05% of polonium, 0.02-0.04% of terbium, 0.01-0.02% of nickel, and the balance of iron and impurity elements. The produced large-section H-shaped steel is lower in alloy content and high in final rolling temperature, reduces the load and the energy consumption of a rolling mill, and improves the production efficiency.

The invention discloses steel for nuclear-power containment with thickness of 6 mm and a manufacturing method of the steel. The low-C and low-Mn composition series design for the steel, extra alloyingcomponents are not added, and an irradiation effect is taken into consideration while yield strength stability is guaranteed. According to the manufacturing method, by means of optimization of blanktype, length of a rolled piece is effectively controlled in a rolling process, and larger temperature fluctuation caused by the too long rolled piece is avoided. With the adoption of superhigh-temperature heating mechanism, higher temperature for blanks is obtained during rolling, and higher final rolling temperature for a steel plate is guaranteed after the rolling is finished. By means of control for the rolling process, temperature drop in the process is reduced, and smaller temperature difference fluctuation of the head and the tail of the rolled piece is guaranteed. The length of the rolled piece is optimized and an area with poorer plate cut is cut off, and performance uniformity of a sampling position is ensured. The 6mm nuclear-power steel produced with the method has the advantages that yield strength is controlled stably, the toughness matching is excellent, and requirements for performance are met completely. The performance qualification rate of production reaches 94%, andthe steel is completely applicable to industrial mass production.

The invention discloses a stainless steel composite plate for a petroleum and natural gas conveying pipeline. The stainless steel composite plate comprises a base material and a covering material, andthe covering material is metallurgically bonded to the base material and made of austenitic stainless steel; the base material is prepared from, by weight, 0.03-0.09% of C, 0.2-0.4% of Si, 1.00-1.70%of Mn, 0-0.02% of P, 0-0.01% of S, 0.015-0.050% of Alt, 0.020-0.090% of Nb, 0-0.05% of V, 0.006-0.030% of Ti, 0.10-0.30% of Cr, 0-0.30% of Ni, 0-0.10% of Mo, 0-0.30% of Cu, 0-0.001% of B and the balance Fe and a few unavoidable impurities. The invention further provides a preparing method of the stainless steel composite plate for the petroleum and natural gas conveying pipeline. The preparing method is simple, feasible and low in cost; the prepared composite plate has good corrosion resistance and strong toughness, a compound interface is straighter, the thickness of the covering material ismore uniform, the surface quality is better, and the stainless steel composite plate can be directly used without annealing heat treatment.

The invention provides a new energy power battery shell, an aluminum alloy and a manufacturing method thereof. The aluminum alloy is prepared from the following components in percentage by weight: 0.17 to 0.30 percent of Si, 0.50 to 0.60 percent of Fe, 0.02 to 0.08 percent of Cu, 0.90 to 1.05 percent of Mn, 0.02 to 0.06 percent of Mg, less than or equal to 0.05 percent, 0.015 to 0.04 percent of Ti, and the balance of Al and the unavoidable impurities with the single element of less than or equal to 0.05 percent and the total amount of less than 0.15 percent. The aluminum alloy provided by theinvention has good plastic deformation capacity, and can meet the requirement on deep drawability and the requirement on surface quality of the battery shell.

The invention provides a hot rolling method for a non-oriented electrical steel thin strip. The electrical steel thin strip comprises, by weight, C<=0.003%, 3.5%-7.0% of Si, Al<=3.0%, 0.10%-1.50% of Mn, P<=0.03%, S<=0. 01%, N<=0.05%, and the balance Fe and unavoidable impurities. Before finish rolling, a plurality of slabs are stacked together to be rolled, the slabs are the same in thickness and component, and the thickness of each slab is 30-40 mm. The rolling starting temperature is controlled to be 950 DEG C or below. In the rolling process, cooling water in a rack is stopped. The final rolling temperature is controlled to be 800 DEG C or above. The coiling temperature is controlled to be 700 DEG C or below. Each roll of steel plate is rolled to be 0.2-0.7 mm. Slow cooling is conducted after coiling. After slow cooling, edge cutting and roll division are conducted. According to the hot rolling method, hot stacking continuous rolling is adopted, and the final rolling temperature is raised, so that a hot rolled plate is fully recrystallized, and the finished product iron loss is further reduced. The electromagnetic property is excellent, the production efficiency is improved, the steel plate is even in thickness, and the hot rolling method is suitable for high-speed stamping and automatic lamination.

A preparation method of a wide alloy plate comprises the following steps that a high-temperature alloy plate blank is subjected to first-fire rolling at the temperature of 1130-1150 DEG C and then subjected to material separation, then subjected to second-fire rolling at the temperature of 1130-1150 DEG C and then subjected to material separation, then subjected to third-fire rolling at the temperature of 1050-1080 DEG C and finally subjected to solid solution leveling treatment; wherein the total deformation of the first-fire rolling is 45%-55%, and the total deformation of the second-fire rolling is 45%-55%; and the total deformation of the third-fire rolling is 60-80%. According to the method, a multi-heating-number and multi-pass forming mode is adopted, firstly, small-deformation cogging is adopted, deformation resistance is reduced, the requirement for equipment is reduced, large-deformation reversing rolling is conducted after cogging is completed, all consistency of the plate structure is improved, and the structure uniformity and performance uniformity of the plate are guaranteed.