Abstract: A nano-precipitate reinforced ultra-high-strength steel and manufacturing method therefor, wherein the ultra-high-strength steel comprises the following components in percentage by weight: C: 0.15~0.21%, Si: ?0.50%, Mn: 0.60~1.60%, Ti: 0.051~0.15%, V: 0.040~0.12%, Cr: 0.20~1.20%, B: 0.0005~0.0030%, Al: 0.02~0.06%, Ca: 0.0005~0.004%, N: ?0.005%, P: ?0.020%, S: ?0.0050%, O: ?0.0040%, Ti+V? 0.11%, the balance being Fe and inevitable impurities, and a nano-precipitate control index NPI is 5~26. The present invention also provides a manufacturing method for the above ultra-high-strength steel.

Abstract: The present invention provides an ultrahigh hole expansion steel and a method for manufacturing therefor. The steel comprises the following components in percentage by mass: C: 0.03-0.09%; Si?0.2%; Mn: 0.5-2.0%; P?0.02%; S?0.003%; Al: 0.2-1.2%; N?0.004%; Ti: 0.05-0.20%; Mo: 0.05-0.5%; Mg?0.005%; O?0.003%; B?0.001%; and the balance being Fe and inevitable impurities. wherein C, Mn, Mo and B in the steel satisfy the following formula: 0.25?2×C+Mn/3+Mo+150×B?1.5; wherein each chemical element in the formula represent the numerical value before the percentage sign of the percentage by mass of corresponding chemical elements. The steel according to the present invention has excellent matching of strength, plasticity and hole expansion performance, and can be applied in passenger vehicle chassis parts that require high strength and thickness reduction, such as a control arm and a subframe.

Abstract: The present invention provides a steel and a method for manufacturing therefor. The steel comprises the following components in the percentage by mass: C: 0.01-0.10%; Si: ?0.2%; Mn: 0.5-2.0%; P: ?0.02%; S: ?0.003%; Al: 0.01-0.08%; N: ?0.004%; V: 0.10-0.50%; O: ?0.003%; and the balance of Fe and inevitable impurities. The steel of the present invention can be applied in passenger vehicle chassis parts needing high strength and thickness reduction such as a control arm and a subframe.

Abstract: Provided in the present invention are a high-plasticity steel and a manufacturing method therefor. The steel comprises the following components in percentage by mass: C: 0.10-0.35%, Si: 0.8-2.0%, Mn: 1.0-3.0%, P: ?0.02%, S ?0.005%, Al: 0.1-2.0%, N: ?0.005%, with the balance being Fe and other inevitable impurities. The steel of the present invention can achieve good matching among a low yield strength, a low yield ratio, a high tensile strength and an ultrahigh elongation rate, and can be widely applied to components with complex shape requirements, or other parts that require thinning while maintaining high strength, such as those in commercial or passenger vehicles.

Abstract: The present invention provides a hot-rolled strip steel and manufacturing method therefor. The hot-rolled strip steel comprises the following components in mass percentage: C: 0.04 to 0.15%, Si?0.50%, Mn: 0.30 to 2.00%, Cr: 1.5 to 4.5%, Cu: 0.10 to 0.60%, P?0.03%, S?0.01%, and Al: 0.01 to 0.60%, with the balance being Fe and unavoidable impurities; and further satisfies: 2.5%?2Mn+Cr?6.0%, with elemental symbols being substituted with mass percentages of corresponding elements in the hot-rolled strip steel for calculation. The hot-rolled strip steel of the present invention exhibits excellent resistance to atmospheric corrosion and mechanical properties, and can be directly used for supporting bracket structural parts such as guardrails, mast towers and photovoltaics without coating on the surface.

Abstract: A 980 MPa-grade full-bainite ultra-high hole expansion steel and a manufacturing method therefor. The hole expansion steel has the following chemical compositions in percentage by weight: 0.05-0.10% of C, Si?2.0%, 1.0-2.0% of Mn, P?0.02%, S?0.003%, 0.02-0.08% of Al, N?0.004%, 0.1-0.5% of Mo, 0.01-0.05% of Ti, O?0.0030%, the remainder being Fe, and other inevitable impurities. The ultra-high hole expansion steel in the present invention has yield strength ?800 MPa, tensile strength ?980 MPa, and a hole expansion rate up to 60% or more, and can be applied in the parts of chassis components such as a control arm and an auxiliary frame, which require high strength thinning and complex forming, of passenger vehicles.

Abstract: A 780 MPa-grade ultra-high reaming steel having high surface quality and high performance stability, and a manufacturing method therefor. The ultra-high reaming steel comprises the following components in percentage by weight: 0.03-0.08% of C, Si?0.2%, 0.5-2.0% of Mn, P?0.02%, S?0.003%, 0.01-0.08% of Al, N?0.004%, 0.05-0.20% of Ti, 0.1-0.5% of Mo, Mg?0.005%, O?0.0030%, and the remainder being Fe and other inevitable impurities.

Abstract: A low-carbon martensitic high hole expansion steel with a tensile strength above 980 MPa, and a manufacturing method therefor, the weight percentage of the chemical components thereof being: C 0.03-0.10%, Si 0.5-2.0%, Mn 1.0-2.0%, P?0.02%, S?0.003%, Al 0.02-0.08%, N?0.004%, Mo 0.1-0.5%, Ti 0.01-0.05%, and O?0.0030%, and the remainder being Fe and other inevitable impurities. The high hole expansion steel of the present invention has a yield strength of ?800 MPa and tensile strength of ?980 MPa, a lateral extension rate A50?8%, and a hole expansion ratio of ?30%, passes cold bending performance tests (d?4a, 180°), and can be used for passenger car chassis parts that require high strength and thinning such as control arms and sub-frames.

Abstract: Disclosed are a 980 MPa-grade bainite high hole expansion steel and a manufacturing method therefor. The steel contains the following chemical components in percentages by weight: 0.05-0.10% of C, 0.5-2.0% of Si, 1.0-2.0% of Mn, P?0.02%, S?0.003%, 0.02-0.08% of Al, N?0.004%, Mo?0.1%, 0.01-0.05% of Ti, Cr?0.5%, B?0.002%, O?0.0030%, and the balance of Fe and other inevitable impurities. The high hole expansion steel of the present invention has a yield strength of ?800 MPa and a tensile strength of ?980 MPa, has a good elongation rate (the transverse A50 being ?11%) and hole expansion performance (the hole expansion ratio being ?40%), and can be applied to a position on a chassis part of a passenger car, such as a control arm and a vice frame, where high strength and thinning are required.

Abstract: A 980 MPa-grade ultra-low-carbon martensite and retained austenite ultra-high hole expansion steel and a manufacturing method therefor. The hole expansion steel comprises the following chemical components in percentage by weight: C 0.03%-0.06%, Si 0.8%-2.0%, Mn 1.0%-2.0%, P?0.02%, S?0.003%, Al 0.02%-0.08%, N?0.004%, Mo 0.1%-0.5%, Ti 0.01%-0.05%, and O?0.0030%. The high hole expansion steel of the present invention has the yield strength ?800 MPa, the tensile strength ?980 MPa, the elongation rate (horizontal A50?10%), the cold bending property (d?4a, 180°), and the hole expansion ratio ?80%, and can be applied to a chassis part of a passenger vehicle such as a control arm, an auxiliary frame and other parts that require high-strength thinning.

Abstract: Disclosed are a high-strength and high-toughness steel plate with an 800 MPa grade tensile strength and a method for manufacturing the same, the chemical composition of the steel plate in weight percentage being: C: 0.15-0.25%, Si: 1.0-2.0%, Mn: 1.2-2.0%, P?0.015%, S?0.005%, Al: 0.5-1.0%, N: ?0.006%, Nb: 0.02-0.06%, O?0.003%, and the balance being Fe and other inevitable impurities, and 1.5%?Si+Al?2.5%. By adopting an isothermal heat treatment a high-strength and high-toughness steel plate with an 800 MPa grade tensile strength, which has a microstructure mainly including bainite ferrite and residual austenite, is obtained impact energy.

Abstract: A 980 MPa-grade hot-rolled dual-phase steel and a manufacturing method therefor. The chemical components of the steel comprise, in percentage by weight, 0.10%-0.20% of C, 0.8%-2.0% of Si, 1.0%-2.0% of Mn, 0-0.02% of P, 0-0.005% of S, 0-0.003% of O, 0.02%-0.06% of Al, 0-0.006% of N, 0.01%-0.06% of Nb, 0.01%-0.05% of Ti, and the balance of Fe and inevitable impurities. In addition, the components need to meet the following relation: 0.05%?Nb+Ti?0.10. The microstructure of the steel is made of ferrite and martensite. The average grain size of the ferrite is 5-10 ?m, and the equivalent grain size of the martensite is 15-20 ?m.

Abstract: The present invention discloses a seawater-corrosion-resistant steel, the mass percentage of the chemical elements thereof being: 0.03-0.05% of C, 0.04-0.08% of Si, 0.8-1.2% of Mn, 0.1-0.2% of Cu, 2.5-5.5% of Cr, 0.05-0.15% of Ni, 0.15-0.35% of Mo, 1.5-3.5% of Al, 0.01-0.02% of Ti, 0.0015-0.003% of Ca, and the balance being Fe and other inevitable impurities. The present invention further discloses a method for manufacturing the seawater-corrosion-resistant steel. The method includes the following steps: (1) smelting and casting; (2) reheating: reheating a casting blank to 1200° C.-1260° C.; (3) rough rolling; (4) finish rolling; (5) coiling; and (6) cooling to room temperature. The seawater-corrosion-resistant steel has good seawater corrosion resistance and excellent mechanical properties.

Abstract: A 980 MPa-grade hot-rolled ferrite bainite dual-phase steel and a manufacturing method therefor. The chemical components of the steel comprise, in percentage by weight, 0.15-0.30% of C, 0.8-2.0% of Si, 1.0-2.0% of Mn, 0-0.02% of P, 0-0.005% of S, 0-0.003% of O, 0.5-1.0% of Al, 0-0.006% of N, 0.01-0.06% of Nb, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities. In addition, the chemical components meet the following relations: 0.05%?Nb+Ti?0.10%, and 2.5?Al/C?5.0. The microstructure of the steel is made of ferrite and bainite. The average grain size of the ferrite is 5-10 ?m, and the equivalent grain size of the bainite is less than or equal to 20 ?m. The yield strength of the steel is greater than or equal to 600 MPa, the tensile strength of the steel is greater than or equal to 980 Mpa, and the ductility is greater than or equal to 15%.

Abstract: Disclosed is provided a low yield ratio and superhigh-strength hot-rolled Q&P steel and a method for manufacturing the same, having the following chemical composition in weight percentage: C: 0.2-0.3%, Si: 1.0-2.0%, Mn: 1.5-2.5%, P: ?0.015%, S: ?0.005%, Al: 0.5-1.0%, N: ?0.006%, Nb: 0.02-0.06%, Ti: ?0.03%, O: ?0.003%, and the balance being Fe and inevitable impurities. The manufacture method comprises a stepped cooling process to finally obtain the steel with a three-phase structure containing a certain volume fraction of proeutectoid ferrite; martensite; and residual austenite, and having an excellent comprehensive performance with a yield strength of ?600 MPa, a tensile strength of ?1300 MPa, a good elongation, and a low yield ratio. The obtained Q&P steel also shows an excellent match of high plasticity suitable for easy deformabilities and wear-resistances.

Abstract: A high-strength steel having a yield strength at a level of 800 MPa and a method of manufacturing the same, with the components and amounts thereof by weight percentage being: C: 0.06-0.14%, Si: 0.1-0.30%, Mn: 0.8-1.60%, Cr: 0.2-0.70%, Mo: 0.1-0.40%, Ni: 0-0.30%, Nb: 0.01-0.030%, Ti: 0.01-0.030%, V: 0.01-0.05%, B: 0.0005-0.0030%, Al: 0.02-0.06%, Ca: 0.001-0.004%, N: 0.002-0.005%, P?0.02%, S?0.01%, O?0.008%, the balance of Fe and unavoidable impurities; wherein the above elements meet the following relationships: 0.40%<Ceq<0.50%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; 0.7%?Mo+0.8Ni+0.4Cr+6V?1.1%; 3.7?Ti/N?7.0; 1.0?Ca/S?3.0.

Abstract: The invention provides a highly corrosion-resistant, high strength, Al-containing weathering steel plate, wherein the chemical composition comprises in weight percentages (wt %) of: C: 0.02-0.07%, Si: 0.2-1.0%, Mn: 0.2-2.2%, P?0.01%, S?0.006%, Cu: 0.2-0.5%, Cr: 0.5-3.5%, Ni: 0.2-1.2%, Al: 0.4-4.0%, N?0.005%; selectively added one or more of Nb: 0.01-0.06%, Ti: 0.01-0.10%, V: 0.02-0.10%; the balance of Fe and unavoidable impurities, wherein Al/Cr is 0.5-8.0. The steel plate has a yield strength of 350-500 MPa, an elongation of 20% or more, a relative corrosion rate of 27% or less and a good impact toughness and a low yield ratio. The present application also provides a method for manufacturing the weathering steel plate.

Abstract: A 980 MPa-grade hot-rolled dual-phase steel and a manufacturing method therefor. The chemical components of the steel comprise, in percentage by weight, 0.10%-0.20% of C, 0.8%-2.0% of Si, 1.0%-2.0% of Mn, 0-0.02% of P, 0-0.005% of S, 0-0.003% of O, 0.02%-0.06% of Al, 0-0.006% of N, 0.01%-0.06% of Nb, 0.01%-0.05% of Ti, and the balance of Fe and inevitable impurities. In addition, the components need to meet the following relation: 0.05%?Nb+Ti?0.10. The microstructure of the steel is made of ferrite and martensite. The average grain size of the ferrite is 5-10 ?m, and the equivalent grain size of the martensite is 15-20 ?m.

Abstract: A 980 MPa-grade hot-rolled ferrite bainite dual-phase steel and a manufacturing method therefor. The chemical components of the steel comprise, in percentage by weight, 0.15-0.30% of C, 0.8-2.0% of Si, 1.0-2.0% of Mn, 0-0.02% of P, 0-0.005% of S, 0-0.003% of O, 0.5-1.0% of Al, 0-0.006% of N, 0.01-0.06% of Nb, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities. In addition, the chemical components meet the following relations: 0.05%?Nb+Ti?0.10%, and 2.5?Al/C?5.0. The microstructure of the steel is made of ferrite and bainite. The average grain size of the ferrite is 5-10 ?m, and the equivalent grain size of the bainite is less than or equal to 20 ?m. The yield strength of the steel is greater than or equal to 600 MPa, the tensile strength of the steel is greater than or equal to 980 Mpa, and the ductility is greater than or equal to 15%.

Abstract: A high-strength steel having a yield strength at a level of 800 MPa and a method of manufacturing the same, with the components and amounts thereof by weight percentage being: C:0.06-0.14%, Si: 0.1-0.30%, Mn: 0.8-1.60%, Cr: 0.2-0.70%, Mo: 0.1-0.40%, Ni: 0-0.30%, Nb: 0.01-0.030%, Ti: 0.01-0.030%, V: 0.01-0.05%, B: 0.0005-0.0030%, Al: 0.02-0.06%, Ca: 0.001-0.004%, N: 0.002-0.005%, P?0.02%, S?0.01%, O?0.008%, the balance of Fe and unavoidable impurities; wherein the above elements meet the following relationships: 0.40%<Ceq<0.50%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; 0.7%?Mo+0.8Ni+0.4Cr+6V?1.1%; 3.7?Ti/N?7.0; 1.0?Ca/S?3.0.