87results about How to "Improve plastic index" patented technology

The invention belongs to the metallurgy field and relates to a production process of a steel wire rod, particularly the steel wire rod for an annealing-free solder wire and a production process of the steel wire rod, wherein the steel wire rod comprises elements in weight percentage as follows: 0.07-0.1% of C, 1.25-1.4% of Mn, 0.4-0.6% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.2-0.55% of Mo, 0.5-1.0% of Ni, less than or equal to 0.2% of Cu, less than or equal to 0.2% of Ti and less than or equal to 0.1% of Al with the balance of Fe. The process comprises steps of detecting a blank, heating the steel blank, descaling by high-pressure water, roughly and intermediately rolling, pre-finishing rolling, cooling in a first section by water, finishing rolling bya unit, cooling in a second section by water, diameter reducing and sizing rolling, cooling in a third section by water, spinning, cooling by wind, finishing and delivering to a warehouse. The methodof the invention employs a rolling-controlled and cooling-controlled process to execute process control of the steel wire rod of the solder wire to obtain an F+P tissue appropriate to draw, and has advantages as follows: good comprehensive mechanical property is realized, a solder wire factory can avoid annealing and perform multi-pass drawing without wire breakage, the production efficiency is greatly increased and the production cost is reduced at the same time.

The invention provides strain design based economical pipe line steel and its manufacturing method. The steel comprises the following ingredients of: by weight, 0.06-0.10% of C, 0.1-0.6% of Si, 1.0-2.0% of Mn, P being less than or equal to 0.015%, S being less than or equal to 0.003%, 0.1-0.3% of Cr, 0.01-0.10% of Nb, 0.005-0.03% of Ti, 0.01-0.06% of Al, N being less than or equal to 0.012%, 0-0.5% of Cu, 0-0.5% of Ni and the balance being Fe. The method provided by the invention comprises steps of smelting, secondary refining, casting and hot rolling, and is characterized in that slab heating temperature is 1050-1280 DEG C; controlled rolling temperature in a recrystallization zone is 900-1250 DEG C; controlled rolling temperature in a non-recrystallization zone is 750-950 DEG C; initial cooling temperature is 680-800 DEG C; finish cooling temperature is 100-500 DEG C; and cooling rate is 5-35 DEG C/s. According to the invention, elements of Mo, V, B and the like are not added, and the total amount of Cu, Cr and Ni is low. In addition, subsequent heat treatment is not required, the process is simple and requires low cost, and production efficiency is high. The steel plate not only has high strength but also has low yield ratio and high uniform extension features. By the adoption of the steel, safety of pipeline operation and economy of pipeline construction can be greatly raised.

The invention discloses strain design based pipe line steel X70 and its manufacturing method. the steel comprises the following ingredients of: by weight, 0.06-0.10% of C, 0.1-0.6% of Si, 1.0-2.5% of Mn, P being less than or equal to 0.015%, S being less than or equal to 0.003%, Cr being less than 0.1%, 0.05-0.35% of Mo, 0.01-0.15% of Nb, 0.005-0.03% of Ti, 0.01-0.06% of Al, one or two components selected from 0-0.5% of Cu and 0-0.5% of Ni, and the balance Fe and unavoidable microscale impurities. The manufacturing method is characterized in that slab heating temperature is 1050-1280 DEG C by a controlled rolling and controlled cooling method; the temperature for controlled rolling in a recrystallization zone is controlled within the range of 900-1250 DEG C; the temperature for controlled rolling in a non-recrystallization zone is controlled within the range of 700-950 DEG C; initial cooling temperature is 650-800 DEG C; finish cooling temperature is 100-500 DEG C; and cooling rate is 5-35 DEG C/s. According to the invention, elements of V, B and the like are not added, and the total amount of Mo, Cu, Cr and Ni is low. In addition, subsequent heat treatment is not required, the process is simple and requires low cost, and production efficiency is high.

The embodiment of the invention provides a spring steel wire rod with cryogenic drawing performance, a spring steel wire, a spring and a manufacturing method thereof, and relates to the field of wirerods. The spring steel wire rod with cryogenic drawing performance comprises the following chemical components in percentage by mass: 0.32%-0.40% of Si and 0.016%-0.030% of Als. The manufacturing method of the spring steel wire comprises the steps that the spring steel wire rod is directly subjected to cold drawing, and the maximum reduction rate of drawing reaches 95%; the drawn steel wire is subjected to low-temperature stress relief annealing treatment, the percentage reduction of area is greater than or equal to 35% and the bending fatigue life is greater than or equal to 20 times. The low-alloy spring steel wire rod with good comprehensive mechanical properties is developed, the wire rod can be directly cold-drawn to produce a thin spring steel wire with large deformation without intermediate annealing, the cold-drawn steel wire can be directly wound into the spring without oil quenching and tempering treatment, the requirement for bending fatigue resistance of the steel wire canalso be met and the production cost is greatly reduced.

The invention belongs to the technical fields of metal materials and metallurgy and particularly relates to a magnesium alloy with warm extrusion property and a preparation method of a magnesium alloy extrusion material. The magnesium alloy is an Mg-Zn-Cu (or Mg-Zn-Ni) magnesium alloy and comprises the following components by weight percent: 3.0%-6.0% of Zn, 1.5%-5.0% of Cu or Ni, 0-1.0% of Y, Nd, Gd, Ce or MM and the balance Mg. The preparation method of the magnesium alloy extrusion material comprises the following steps: preparing magnesium alloy ingots by adopting a low-frequency electromagnetic oil lubricating semicontinuous casting method; performing warm extrusion to the Mg-Zn-Cu (or Mg-Zn-Ni) magnesium alloy ingots at 160-240 DEG C by using an indirect extrusion device, wherein the extrusion ratio is 8-20 and the extrusion speed is 4.5-8m/min; and thus obtaining Mg-Zn-Cu (or Mg-Zn-Ni) magnesium alloy extrusion bars. After the Mg-Zn-Cu (or Mg-Zn-Ni) magnesium alloy extrusion bars are subjected to T4 or T6 heat treatment, the elongation rate is 20%-35%.

The invention discloses a high-strength steel plate for ocean engineering and a production method thereof. The production method comprises the working procedures of smelting, continuous casting, heating, rolling, heat stacking and heat treatment, wherein the molten steel obtained in the smelting procedure comprises the following chemical ingredients with contents in percentage by mass: 0.05-0.09% of C, 0.10-0.30% of Si, 1.1-1.35% of Mn, not greater than 0.010% of P, not greater than 0.003% of S, 0.15-0.4% of Ni, 0.15-0.35% of Cr, 0.10-0.30% of Mo, 0.020-0.050% of Nb, 0.03-0.05% of V, 0.020-0.050% of TAl, and balance Fe and inevitable impurities; a quenching and tempering process is adopted in the heat treatment procedure; during the quenching process, a heating temperature is 880-910 DEG C, and a total heating time is PLC +(20-40) minutes; and during the tempering process, a heating temperature is 580-620 DEG C, a total heating time is 1.5-2 minutes per millimetre, and air cooling is carried out after discharge. According to the method disclosed by the invention, through adjustment and optimization for the proportion of alloy elements in the steel plate, and quenching and low-temperature short-time tempering, good mechanical properties of the steel plate can be guaranteed under a low-carbon-equivalent condition, and the steel plate is enabled to have good structure, comprehensive property and welding property.

The invention belongs to the technical field of steel rail manufacturing and in particular relates to a high strength tough pearlite steel rail and a manufacturing method thereof. In order to solve the problem that the obtained pearlite steel rail is poor in performance as the fracture surface performance of a railhead of the pearlite steel rail in the prior art is not uniform, the invention provides the manufacturing method of the high strength tough pearlite steel rail. The manufacturing method comprises the following steps of: a, performing hot rolling on a steel blank to a steel rail, wherein the finishing temperature is 900-1000 DEG C; b, spraying a cooling medium to the top surface of the railhead and two side faces of the railhead by means of finishing waste heat when the central temperature of the top surface of the steel rail is air-cooled to 800 DEG C and performing cooling till the central temperature of the top surface of the steel rail is 750 DEG C; and c, spraying the cooling medium to the top surface of the railhead, two side faces of the railhead and lower jaws of two sides of the railhead, and performing air-cooling to room temperature after the temperature of the surface layer of the railhead is smaller than or equal to 450 DEG C. By way of control of the components of steel and accelerated cooling in two sections, steel which is more excellent in performance is prepared. The method provided by the invention is simple to operate, not high in equipment demand and suitable for being popularized and used.

The invention relates to a steel strip, in particular to a medium-strength packaging steel strip and a production method thereof. The medium-strength packaging steel strip comprises the following components in percentage by weight: 0.05 to 0.10 percent of C, 0.10 to 0.15 percent of Si, 1.00 to 1.55 percent of Mn, less than or equal to 0.05 percent of P, less than or equal to 0.050 percent of S and the balance of Fe. The production method of the medium-strength packaging steel strip comprises the following steps: a) cold-rolled roll unrolling; b) steel strip longitudinal cutting and stripping; c) surface blueing; d) cooling and washing; e) painting; f), drying coatings; and g) rolling. The medium-strength packaging steel strip solves the technical problem that the packaging steel strip produced by using a cold-rolled roll with a carbon content of less than 0.10 percent has a tensile strength which cannot be kept over 800MPa stably and a breakage elongation of more than 6 percent.

The invention belongs to the technical field of ferrous metallurgy technology, and especially provides a production technology of finish-rolled ribbed bars. The technological line provided by the invention comprises steps of billet heating, rolling, on-line controlled cooling, cold bed natural cooling, scaling, and stack cooling. Medium-carbon steel is adopted in square billets with a dimension of 150mm*150mm. A three-stage heating method comprising preheating, heating, and soaking is adopted in the heating process. An initial rolling temperature is controlled at 1000 DEG C to 1100 DEG C in the rolling process. In the on-ling controlled cooling process, the temperature is controlled at 920 to 1000 DEG C when the billets are delivered into a water tank; a one-step cooling method is adopted; self-tempering temperatures of PSB785 and PSB830 are controlled at 480 to 550 DEG C; and a self-tempering temperature of PSB930 is controlled at 430 to 480 DEG C. The cooling speed is controlled at 1-5 DEG C/s in the cold bed natural cooling process. Off-line stack cooling under a temperature of 150 to 350 DEG C is carried out in the stack cooling process, wherein a stack cooling time is lower than 48 hours. Various properties of the finish-rolled ribbed bars provided by the invention can completely satisfy the requirements of users.

The invention provides hot rolled steel for a vehicle wheel steel ring, which comprises the following chemical components in percent by weight: 0.06-0.12 percent of C, not more than 0.10 percent of Si, 0.30-0.70 percent of Mn, not more than 0.030 percent of P, not more than 0.020 percent of S and 0.010-0.060 percent of Al. A production process of the hot rolled steel comprises the steps of: LF (Low Frequency) external refining on molten steel meeting the requirement of the chemical components and being obtained through smelting, slab continuous casting, heating of a step type heating furnace, continuous casting of a 2032mm hot continuous casting unit, laminar flow cooling, coiling, checking, storing and delivering. The hot rolled steel for the vehicle wheel steel ring is suitable for cold machining forming, and meets the demands on the cold machining forming.

The invention belongs to the technical field of steel rail manufacturing and particularly relates to an internal-damage-resistant pearlite steel rail and a manufacturing method thereof. For the problems that the performance of an on-line heat treatment pearlitic steel rail head prepared in the prior art is low in uniformity and poor in internal-damage-resistant performance. The invention providesthe manufacturing method of the internal-damage-resistant pearlitic steel rail. The manufacturing method comprises the following steps: a, conducting hot rolling on a steel billet to form a steel rail; b, when the center temperature of the top surface of the steel rail is air-cooled to 750-800 DEG C, utilizing final rolling waste heat to cool both sides of the rail head until the center temperature of the top surface is 700 DEG C; c, cooling the top surface of the rail head, the two side surfaces of the rail head and the lower jaws of the two sides of the rail head until the temperature of thesurface layer of the rail head is 520 -550 DEG C, then cooling the top surface of the rail head and the two sides of the rail head until the temperature is 400 -450 DEG C, and carrying out air cooling to the room temperature. The steel with better performance is prepared by controlling steel components and three-section accelerated cooling mode. The internal-damage-resistant pearlite steel rail and the manufacturing method are suitable for a large-transport-capacity railway with high requirements on the anti-fatigue performance of the steel rail.

The invention discloses a lead-free easily cut and deformed SnZnBi aluminum alloy. The alloy consists of the following components in percentage by weight: 8 to 12 percent of aluminum (Al), 0.8 to 1.5 percent of copper (Cu), 0.05 to 0.2 percent of bismuth (Bi), 0.05 to 0.15 percent of stannum (Sn) and the balance of Zn and inevitable impurities, wherein the content of the impurities is less than or equal to 0.05 percent. The alloy of the invention has excellent cutting property, good mechanical property and good machining and molding property, is easy to realize extrusion molding, can be prepared into rods and wires, and is particularly suitable for the machining and production fields having relatively high requirements on cutting, machining and molding; the raw materials are cheap and readily available; and the alloy contains no lead, is environment-friendly, is the lead-free easily cut and deformed SnZnBi aluminum alloy capable of substituting lead brass and has good application prospect.

The invention discloses a preparation method of a cup-shaped flexible wheel and a device thereof. A circular slab is tightened at the end of a core die by a tail top. A positive wire of a pulse powersupply is connected with the core die, and a negative wire is directly connected with each rotary wheel of a rotary wheel assembly. The circular slab is first spun and deformed into a cup-shaped workpiece with both inner and outer walls being straight walls by one rotary wheel. Then the cup-shaped workpiece is spun and deformed into two thickened cup-shaped workpieces with different straight wallthickness by another two rotary wheels, and a thicker smooth section is used as a tooth profile reserved section. Finally, the tooth profile reserved section is spun by one toothed rotary wheel to form a circle tooth profile around the outer circumference. At last, a small amount of cutting process is carried out to complete the processing process from the circular slab to the cup-shaped flexiblewheel workpiece. According to the cup - shaped flexible wheel manufacturing process based on plastic forming, streamline formed in the process of deformation can be completely retained, and the service life of parts is prolonged advantageously. The advantage of the method is more obvious for flexible wheels with an extremely small thickness.

The forging for heavy combustion vane uses ze pi 479 steel, with technical conditions being C 0.12%-0.18%, Cr 15%-16.5%, Ni 2.0%-2.5%, Mo 0.9%-1.3%, N 0.03%-0.10%. The final forging temperature is controlled within 1040deg.C-1160deg.C, with deformation ratio bigger than 25%. It determines the deformation temperature and heat treatment system to meet the production requirement for heavy combustion steel vanes.

The invention provides a high-pressure-resisting and low-carbon alloy steel material. According to the low-carbon alloy steel material, except Fe element, the other elements by weight percent are as follows: 0.15-0.2% of C, 0.15-0.35% of Si, 0.7-0.9% of Mn, 0.001-0.015% of S, 0.001-0.015% of P, 0.45-0.65% of Cr, 0.7-1.0% of Ni, 0.45-0.6% of Mo, 0.02-0.05% of Al, 0.003-0.008% of V and 0.02-0.05% of Nb. A smelting technology combining electric furnace treating and vacuum refining degassing with electroslag re-smelting is adopted. The content of C element is properly reduced in the material; the trace elements Nb, V and Al are increased; the effects of increasing the strength by 15% and refining grains for 2-3 levels by the material are achieved; the ductility and the toughness of the material are further increased; the dosage of rare elements, such as Cr, Ni and Mo, is reduced; and the material belongs to a resource-saving type material.

The invention belongs to the field of metal materials, and specifically discloses a steel wire rod for aluminum-containing steel fibers and used for deep drawing, and a rolling method thereof. A continuous casting billet comprising specific components is obtained according to an aluminum-containing pure steel smelting process, reasonable heating temperature and heating time of the continuous casting billet are controlled in a heating furnace, and the process parameters of the wire rod in a rolling process and the cooling process parameters of the wire rod on a Stelmor cooling line are optimized, so that the produced wire rod for the steel fibers is high in universality, uniform in structure, small in crystal grain, excellent in mechanical property, and good in plasticity index, and an ironoxide sheet has a thickness of 10-20[mu]m, and is suitable for mechanical shelling and low in wire fracture; and the wire rod produced by the method has tensile strength Rm of 350-390MPa, percentageelongation A of not less than 40% after fracture, area reduction Z of not less than 80%, and ferrite grain size of 7-8, the wire fracture in a drawing process of a user can be controlled to be less than 0.25 times per ton, and the technical requirement of a wire rod for high-grade steel fibers is completely met.