Baoshan Iron & Steel Co., Ltd.

Xinyan Jin

Li Ping Wang

Yong Zhong

Guangkui Hu

Qi Yang

Yulong Zhang

Hui Wang

Hao Liu

Shu Zhou

Cheng Wang

Yong Qing Lu

Li Wang

Lei Yu

Jun Shen

Shanqing Li

Hao Xu

Bing Yang

Yueming Zhou

Yong Lu

Yanliang Zhao

Hanlong Zhang

Yiqiang Sun

Ning Tan

Xiaoguang Hou

Hongwei Qian

Cunbing Wang

Tingquan Gu

Xinping Mao

Shuize Wang

Jiyao Hong

Disclosed are a low-cost ultra-high-strength multiphase steel plate/steel strip and its manufacturing method. Said steel plate/steel strip comprises the following components in percentage by weight: 0.03 to 0.07% of C, 0.1 to 0.5% of Si, 1.3 to 1.9% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.01 to 0.05% of Al, 0.2 to 0.5% of Cr, 0.07 to 0.14% of Ti, less than 0.03% of (Ni+Nb+Mo+V), and the balance being Fe and other inevitable impurities; and Mn+1.5Cr+5 (Ti+Al+Cu)+10(Mo+Ni)+20(Nb+V)<3.0; Mn+2Cr+4Ti+4Nb+4V+4Mo—Si/3+2C≤3.0. The steel plate is mainly used for the manufacturing of automotive chassis and suspension system parts.

Low-carbon low-cost ultra-high-strength multiphase steel plate/steel strip and manufacturing method therefor

Disclosed are a method and a device for controlling flow of liquid zinc () in a zinc pot () for hot-dip galvanization. Under the blowing effects of an air knife above the zinc pot () for hot-dip galvanization onto strip steel (), the liquid zinc () diffuses and flows outwards to zones (zones I, II, III and IV) comprising the left side, the right side, the front end of the zinc pot, respectively, and a zone between the strip steel () and a furnace snout (), and surface dross rapidly generated on the surface of the liquid zinc () is driven to flow outwards to the zones (zones I, II, III and IV). On edge sides of the zones (zones I, II, III and IV), travelling magnetic field generators () are arranged in multiple sections above the surface of the liquid zinc () in the zinc pot (), so as to excite a travelling magnetic field to generate an electromagnetic driving force on the liquid zinc () to drive the flow of the liquid zinc (). The flow of the liquid zinc () caused by the travelling magnetic field generators () is engaged with the blowing flow of the air knife, driving the surface liquid zinc () in the zinc pot () to flow in order towards a rear end (zone V) of the zinc pot (). The surface dross floating on the surface of the liquid zinc () is driven by the flowing liquid zinc () to flow in a controlled direction.

Method and device for controlling flow of liquid zinc in zinc pot for hot-dip galvanization

A cold-rolled high-strength steel plate having excellent phosphating performance and formability and a manufacturing method therefor. The chemical composition of the steel plate is, in percentage by weight, C-%, Si-%, Mn-%, P&#x2264;%, S&#x2264;%, Al-%, N&#x2264;%, the remainder being Fe and impurities. The surface layer of the steel plate has an inner oxide layer with a thickness of-&#x3bc;m, and there is no enrichment of Si and Mn on the surface of the steel plate. The steel plate has tensile strength of &#x2265;MPa and an elongation of &#x2265;%. The structure at the room temperature contains retained austenite, ferrite, and martensite and/or bainite.

Cold-rolled high-strength steel plate having excellent phosphating performance and formability and manufacturing method therefor

A cold-rolled steel plate () and a manufacturing method therefor. The chemical composition of the steel plate () in percentage by weight is: C 0.15-0.25%, Si 1.50-2.50%, Mn 2.00-3.00%, P&#x2264;0.02%, S&#x2264;0.01%, Al 0.03-0.06%, N&#x2264;0.01%, with the balance being Fe and impurities. The surface layer has an inner oxide layer () with a thickness of 1-5 &#x3bc;m, and there is no enrichment of Si or Mn on the surface. The steel plate () has good phosphating performance and formability, with a tensile strength of &#x2265;1180 MPa and an elongation of &#x2265;14%, and has a complex-phase structure of ferrite, martensite, and retained austenite, the content of the retained austenite being not lower than 5%. A dew point is at &#x2212;25&#xb0; C. to 10&#xb0; C. in continuous annealing, such that external oxidation transitions to internal oxidation.

A hot dipped high manganese steel and a manufacturing method therefor. The high manganese steel comprises a steel base plate and a coating on the surface of the steel base plate. The core of the steel base plate is austenite. The surface layer of the steel base plate is a ferrite fine grain layer. The ferrite fine grain layer comprises an oxide of Al. Furthermore, the steel base plate of the hot dipped high manganese steel comprises, in mass percentages, 10 to 30% of Mn element, 1 to 2% of Al element, and 0.4 to 0.8% of C element. The manufacturing method comprises: 1) manufacturing strip steel; 2) primary annealing and acid washing; 3) secondary annealing and hot dipping.

Hot dipped high manganese steel and manufacturing method therefor

A cold-rolled low-density steel sheet having excellent phosphorability is provided. An iron particle layer is disposed on the surface of the cold-rolled low-density steel sheet, and dispersed iron particles exist in the iron particle layer. The cold-rolled low-density steel sheet comprises 3.0% to 7.0% of element Al by mass percentage.

Cold-rolled low-density steel sheet having excellent phosphorability, and manufacturing method therefor

Low-density hot dip galvanized steel, comprising a steel substrate () located at a core portion and a coating layer () located on the surface. An interface layer is disposed between the steel substrate () and the coating layer (), the interface layer comprises an iron particle layer (), iron particles dispersed on the steel substrate () and covering the steel substrate () are disposed in the iron particle layer (), and the iron particles are covered by a first inhibition layer (). The low-density hot dip galvanized steel contains element Al in a mass percentage of 3.0% to 7.0%. Correspondingly, the present invention also comprises a manufacturing method for the low-density hot dip galvanized steel. The low-density hot dip galvanized steel has a low density, a high strength and high galvanizability and coating layer adhesion.

Low-density hot dip galvanized steel and manufacturing method therefor

A hot dipped medium manganese steel and a manufacturing method therefor. The medium manganese steel comprises a steel base plate and a coating on the surface of the steel base plate; the mass percentages of the components in the hot dipped medium manganese steel are: C: 0.1 to 0.3%, Si: 0.1 to 2.0%, Mn: 5 to 12%, Al: 1 to 2%, P&#x2264;0.02%, S&#x2264;0.02%, N&#x2264;0.005%, and the remaining being Fe and unavoidable impurities; the core structure is ferrite and austenite, and the surface layer of the steel base plate is a ferrite layer.

Hot dipped medium manganese steel and manufacturing method therefor

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Shanghai, China

Xinyan Jin