Baoshan Iron & Steel Co., Ltd.

Fengming Song

Xiaoping Hu

Donghui Wen

Ana Yang

Zigang Li

Gang Liu

Jianye Li

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&#x2264;0.02%, S&#x2264;0.01%, O&#x2264;0.008%, the balance of Fe and unavoidable impurities; wherein the above elements meet the following relationships: 0.40%&#x3c;Ceq&#x3c;0.50%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; 0.7%&#x2264;Mo+0.8Ni+0.4Cr+6V&#x2264;1.1%; 3.7&#x2264;Ti/N&#x2264;7.0; 1.0&#x2264;Ca/S&#x2264;3.0.

High-strength steel with yield strength of 800 MPa and production method therefor

There is disclosed in the disclosure a protective steel plate with excellent cold roll formability, comprising: three soft steel layers () and two hard steel layers (), wherein the three soft steel layers () and the two hard steel layers () are positioned alternately, and face layers of the protective steel plate are soft steel layers (), wherein the hard steel layers () and the soft steel layers () are atomically bonded by rolling cladding; wherein the soft steel layers () comprise chemical elements in percentage by mass of: C: 0.001-0.01%, 0&#x3c;Si&#x2264;0.005%, Mn: 0.05-0.15%, 0&#x3c;Al&#x2264;0.005%, Ti: 0.01-0.10%, with a balance of Fe and other unavoidable impurities.

Protective steel plate with excellent cold-bend processing performance and method for manufacturing same

There is disclosed in the disclosure a protective clad steel plate, comprising hard steel layers () and soft steel layers () arranged alternately, wherein face layers of the protective clad steel plate are hard steel layers (), wherein the hard steel layers () and soft steel layers () are atomically bonded by rolling cladding; wherein the soft steel layers () comprise chemical elements in percentage by mass of: C: 0.001-0.01%, 0&#x3c;Si&#x2264;0.005%, Mn: 0.05-0.15%, 0&#x3c;Al&#x2264;0.005%, Ti: 0.01-0.10%, with a balance of Fe and unavoidable impurities.

Protective composite steel plate and method for manufacturing same

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&#x2264;0.01%, S&#x2264;0.006%, Cu: 0.2-0.5%, Cr: 0.5-3.5%, Ni: 0.2-1.2%, Al: 0.4-4.0%, N&#x2264;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.

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Shanghai, China

Fengming Song