公开(公告)号：US20220072592A1

公开(公告)日：2022-03-10

申请号：US17417225

申请日：2019-11-14

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Xiaojun LIANG ,  Sihai JIAO ,  Jianhua DING ,  Xiangqian YUAN ,  Qing SHI ,  Wanxiao LAI ,  Suoquan ZHANG ,  Zhiyu WANG ,  Yingmin HAO ,  Xiaoyong TAO

IPC分类号： B21B1/46 ,  C21D1/02 ,  C21D6/00 ,  C21D9/46

摘要： Disclosed are a corrosion-resistant marine composite steel plate and a manufacturing method therefor. The corrosion-resistant composite steel plate has a two-layer structure, wherein one layer is duplex stainless steel, and the other layer is marine carbon steel; said duplex stainless steel comprises the following components by weight: C≤0.03%, Mn≤2.00%, Si≤1.00%, Cr: 21.0-23.0%, Ni: 4.5-6.5%, Mo: 2.5-3.5%, N: 0.08-0.20%, P≤0.02%, S≤0.025%, and the balance being Fe and inevitable impurities; and said marine carbon steel comprises the following components by weight: 0.03%≤C≤0.13%, Si≤0.50%, Mn: 0.90-1.60%, P≤0.020%, S≤0.025%, Cu≤0.035%, Cr≤0.20%, Ni≤0.40%, Nb: 0.02-0.05%, Ti≤0.02%, Mo≤0.08%, Al≥0.015%, and the balance being Fe and inevitable impurities. A rolled composite steel plate is produced by using a double-barrier vacuum assembly method, so that a reduction in structure weight is achieved while a good structural strength and an excellent corrosion resistance are obtained

公开(公告)号：US20220010393A1

公开(公告)日：2022-01-13

申请号：US17413781

申请日：2019-12-27

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Suoquan ZHANG ,  Sihai JIAO ,  Jianhua DING ,  Xiaojun LIANG

IPC分类号： C21D8/02 ,  C22C38/04 ,  C22C38/02

摘要： Provided are a gradient steel material having a surface layer with ferrite and an inner layer with ferrite+pearlite, and a manufacturing method, the weight percentages of the components are: C≤0.15%, Si≤1%, Mn≤1.5%, the balance of Fe and inevitable impurities, and the surface layer of the steel material is ferrite, the inner layer is ferrite+pearlite. The manufacturing method thereof includes: smelting, casting, rolling, heat treatment; wherein, in the heat treatment step, the steel material is heated above the austenitizing temperature Ac3, and hold at the temperature more than 3 min to ensure that the material is completely austenitized; subsequently, it is cooled to a temperature below Ar1 at a cooling rate lower than 0.5° C./s. The present steel material does not need to be obtained by means of the compound preparation of different materials, and is only processed and prepared by a single material, the process is short, the procedure is simple, and the cost is low.