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1. 发明授权

US09663840B2 500 MPA grade longitudinally-welded steel pipe with low yield ratio and manufacturing method therefor 有权
公开(公告)号：US09663840B2
公开(公告)日：2017-05-30
申请号：US14761365
申请日：2013-10-09
申请人： BAOSHAN IRON & STEEL CO., LTD.
发明人： Qingchao Tian , Hongde Shi , Huaizhong Wang , Qijiang Wang
IPC分类号： C21D8/10 , C21D9/08 , C21D6/00 , C22C38/02 , C22C38/14 , C22C38/06 , C22C38/04 , F16L9/02 , B23K31/02 , B21C37/08 , F16L9/17 , C22C38/12 , C21D8/04 , C21D9/50
CPC分类号： C21D8/105 , B21C37/0811 , B23K31/027 , C21D6/005 , C21D6/008 , C21D8/0463 , C21D8/10 , C21D9/08 , C21D9/085 , C21D9/50 , C21D2211/004 , C21D2211/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , F16L9/02 , F16L9/17
摘要： A 500 MPa grade longitudinally welded steel pipe with a low yield ratio and a manufacturing method therefor, the components thereof by weight percentages being as follows: C 0.11%-0.16%, Si 0.15%-0.35%, Mn 0.8%-1.5%, V 0.06%-0.15%, Al 0.002%-0.04%, Ti 0%-0.05%, Nb 0%-0.05%, the balance being Fe and inevitable impurities, and the carbon equivalent Ceq being not more than 0.4%. According to the above component design, molten steel is subjected to smelting in a converter or electric furnace, and is cast into a slab; the slab is heated at 1,200° C.-1,300° C. and rolled into a plate strip, with the finished rolling temperature of the plate strip being between 840° C.-940° C.; the rolled plate strip is subjected to laminar flow cooling with a water curtain, the laminar flow cooling adopting the manner of rear-section cooling, and is coiled into a plate roll when being cooled to the temperature interval of 500° C.-560° C.; and after welding formation, a heat treatment on the welding seams is carried out at a heating temperature of 950° C.±50° C. The steel pipe of the present invention has the characteristics of an excellent welding property, a high strength and toughness, a low yield ratio and the like, and the yield strength thereof is greater than 500 MPa and the yield ratio thereof is less than 0.85.

2. 发明申请

US20180187277A1 HIGH-TOUGHNESS SEAMLESS STEEL TUBE FOR AUTOMOBILE SAFETY AIRBAG AND MANUFACTURING METHOD THEREFOR 审中-公开
公开(公告)号：US20180187277A1
公开(公告)日：2018-07-05
申请号：US15321189
申请日：2015-01-14
申请人： BAOSHAN IRON & STEEL CO.,LTD.
发明人： Guoli Zhai , Qingchao Tian , Qijiang Wang , Cailing Liu
IPC分类号： C21D8/10 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/58 , C22C38/42 , C22C38/06 , C22C38/02 , C21D9/08
CPC分类号： C21D8/105 , C21D9/08 , C21D2211/002 , C21D2211/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/32 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/58
摘要： A high strength and toughness seamless steel tube for an automobile airbag, comprising the following elements, by wt %: C: 0.05-0.15%; Si: 0.1-0.45%; Mn: 1.0-1.9%; Ni: 0.1-0.6%; Cr: 0.05-1.0%; Mo: 0.05-0.2%; Cu: 0.05-0.50%; Al: 0.015-0.060%; Nb: 0.02-0.1%; V: 0.02-0.15%; and the balance being Fe and other inevitable impurities. A method for manufacturing the seamless steel tube comprises the steps: (1) heating a tube blank and then soaking; (2) hot piercing, reducing the diameter and the wall thickness of the tube blank with a stretch reducer and then cooling naturally; (3) annealing, pickling, phosphating and saponifying; (4) cold working to obtain a finished product size; and (5) carrying out stress relief annealing treatment.

3. 发明申请

US20150361518A1 500 MPa GRADE LONGITUDINALLY WELDED STEEL PIPE WITH LOW YIELD RATIO AND MANUFACTURING METHOD THEREFOR 有权
标题翻译： 500MPa等级长期焊接钢管，低成型钢管及其制造方法
公开(公告)号：US20150361518A1
公开(公告)日：2015-12-17
申请号：US14761365
申请日：2013-10-09
申请人： BAOSHAN IRON & STEEL CO., LTD.
发明人： Qingchao Tian , Hongde Shi , Huaizhong Wang , Qijiang Wang
IPC分类号： C21D8/10 , C21D9/08 , C21D6/00 , C22C38/02 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , F16L9/02 , B23K31/02
CPC分类号： C21D8/105 , B21C37/0811 , B23K31/027 , C21D6/005 , C21D6/008 , C21D8/0463 , C21D8/10 , C21D9/08 , C21D9/085 , C21D9/50 , C21D2211/004 , C21D2211/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , F16L9/02 , F16L9/17
摘要： A 500 MPa grade longitudinally welded steel pipe with a low yield ratio and a manufacturing method therefor, the components thereof by weight percentages being as follows: C 0.11%-0.16%, Si 0.15%-0.35%, Mn 0.8%-1.5%, V 0.06%-0.15%, Al 0.002%-0.04%, Ti 0%-0.05%, Nb 0%-0.05%, the balance being Fe and inevitable impurities, and the carbon equivalent Ceq being not more than 0.4%. According to the above component design, molten steel is subjected to smelting in a converter or electric furnace, and is cast into a slab; the slab is heated at 1,200° C.-1,300° C. and rolled into a plate strip, with the finished rolling temperature of the plate strip being between 840° C.-940° C.; the rolled plate strip is subjected to laminar flow cooling with a water curtain, the laminar flow cooling adopting the manner of rear-section cooling, and is coiled into a plate roll when being cooled to the temperature interval of 500° C.-560° C.; and after welding formation, a heat treatment on the welding seams is carried out at a heating temperature of 950° C.±50° C. The steel pipe of the present invention has the characteristics of an excellent welding property, a high strength and toughness, a low yield ratio and the like, and the yield strength thereof is greater than 500 MPa and the yield ratio thereof is less than 0.85.
摘要翻译：具有低屈服比的500MPa级纵向焊接钢管及其制造方法，其重量百分比如下：C 0.11％-0.16％，Si 0.15％-0.35％，Mn 0.8％-1.5％， V 0.06％-0.15％，Al 0.002％-0.04％，Ti 0％-0.05％，Nb0％-0.05％，余量为Fe和不可避免的杂质，碳当量Ceq不大于0.4％。根据上述部件设计，钢水在转炉或电炉中进行熔炼，铸造成板坯; 将板坯在1200℃-1.300℃下加热并轧制成板条，板条的成品轧制温度在840℃-940℃之间。轧制板条用水幕进行层流冷却，层流冷却采用后段冷却方式，当冷却至500℃-560℃的温度区间时，卷取成板卷 C。; 在焊接成形之后，在950℃±50℃的加热温度下对焊缝进行热处理。本发明的钢管具有焊接性优异，强度高，韧性好的特点，低屈服比等，屈服强度大于500MPa，屈服比小于0.85。

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