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616results about How to "High yield strength" patented technology

Tough ultra-strength stainless steel and method for manufacturing the same

The invention discloses a high-flexibility high-strength stainless steel and a method for making the same, wherein the method comprises the following steps of: 1) preparing parent alloy, the chemical compositions by weight percentage of which are: less than or equal to 0.03 percent of C, less than or equal to 0. 10 percent of Mn, less than or equal to 0.10 percent of Si, less than or equal to 0.002 percent of S, less than or equal to 0.006 percent of P, 6.0 to 13.0 percent of Cr, less than or equal to 0.05 percent of Al, less than or equal to 0.10 percent of Cu, less than or equal to 0.05 percent of Ti, the balance Fe and unavoidable impurities; 2) melting an electrode with a vacuum induction furnace, in which the parent alloy is prepared with pure iron, nickel, and other metal material for melting the electrode; 3) vacuum consumable remelting, at a melting speed of between 180 and 220 Kg/h; 4) forging, in which steel ingots are heated at a temperature of 1180+-20 DEG C, with the temperature maintained for 3 to 6 hours, and are upset and drawn twice, and the forging temperature is above 850 DEG C. The stainless steel of the invention has matched combination properties including 1800Mpa strength, 1400 Mpa yield strength, 50J impact ductility, more than 100 Mpa fracture toughness.
Owner:宝钢特钢有限公司

Low-cost non-quenched and tempered high-strength weathering steel with yield strength level of 700MPa and manufacturing method thereof

InactiveCN101921965AAdd corrosion resistant elementsLow costUltimate tensile strengthContinuous rolling
The invention provides low-cost non-quenched and tempered high-strength weathering steel with yield strength level of 700MPa for containers and a manufacturing method thereof. Based on the carbon manganese structural steel composition, the reinforcement effect is enhanced by adding a proper amount of micro-alloy elements such as Nb, Ti, Cu, Cr, Ni and the like, adopting a controlled rolling and controlled cooling technique, taking production characteristics of a normal hot continuous rolling machine into consideration and using a high-Ti component design. Meanwhile, Si content is reduced and high cold forming performance is ensured. The weathering steel for the containers comprises the following components in percentage by weight: 0.05 to 0.10 percent of C, less than or equal to 0.15 percent of Si, 1.5 to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, 0.3 to 0.8 percent o Cr, 0.2 to 0.4 percent of Cu, 0.15 to 0.4 percent of Ni, 0.09 to 0.15 percent of Ti, 0.02 to 0.08 percent of Nb, less than or equal to 0.005 percent of N, less than or equal to 0.002 percent of O and the balance of Fe and inevitable impurities. The yield strength is over 700MPa, the tensile strength is over 800MPa and the elongation is over 18 percent.
Owner:SHANDONG IRON & STEEL CO LTD

Method and die for forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets

InactiveCN101850376ASmall grain sizeSolve the problem of not being able to continuously prepare large-size semi-solid billetsExtrusion diesSemi solidLarge deformation
The invention discloses a method and a die for the forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets. The preparation method comprises a predeformation process and an isothermal spheroidizing heat treatment process, wherein in the predeformation process, uniform deformation of large deformation amount is realized by the die for the forward extrusion and variable diameter bending extrusion; cutting a magnesium alloy bar stock which is subjected to large deformation by a fixed size; heating the magnesium alloy bar stock cut by the fixed size at the temperature of between 520 and 580 DEG C under the protection of argon, and keeping the temperature of the obtained magnesium alloy bar stock for 10 to 30 minutes; and processing a bending extrusion angle of the die to be over 90 degrees. The method has the advantages of small predeformation resistance, large and uniform deformation, safety, reliability and no three-waste pollution. The grains of the prepared magnesium alloy semi-solid billets have fine size, are uniform and have a shape close to that of a sphere. The method solves the problem that the conventional SIMA method cannot continuously prepare the large-size semi-solid billets and meets the requirements of the semi-solid thixoforming workpieces for large-scale continuous production.
Owner:CHANGZHOU INST OF TECH

System and process for cooling after H-shaped steel is hot-rolled

The invention discloses a system and a process for cooling after H-shaped steel is hot-rolled. The cooling system comprises a control system, a cooling module, a water tank, a water inlet pipeline and a water outlet pipeline, wherein one side of the water inlet pipeline is connected with a water supply system, and the other side of the water inlet pipeline is connected with the water tank; and one side of the water outlet pipeline is connected with the water tank, and the other side of the water outlet pipeline is connected with the cooling module. The cooling process comprises the following steps of: feeding the hot-rolled H-shaped steel into the cooling system, aligning upper and lower R parts of the hot-rolled H-shaped steel with cooling nozzles arranged on the upper and lower sides, aligning flange centers on the left and right sides of the hot-rolled H-shaped steel with cooling nozzles arranged on the left and right sides, performing spray cooling, and controlling the pressure of cooling water to be between 8 and 10MPa, the flow of the cooling water to be between 400 and 600m<3>/h, the continuous cooling time of each cross section on section steel to be between 10 and 15 seconds and the cooling rate to be between 30 and 50 DEG C/s. The cooling system with small investment is particularly suitable for improving the strength of the hot-rolled H-shaped steel of small specification of below 400mm*200mm.
Owner:MAANSHAN IRON & STEEL CO LTD
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