High-tensile-strength steel and method of manufacturing the same
    1.
    发明授权
    High-tensile-strength steel and method of manufacturing the same 有权
    高强度钢及其制造方法

    公开(公告)号:US06245290B1

    公开(公告)日:2001-06-12

    申请号:US09380254

    申请日:1999-08-25

    IPC分类号: C21D800

    摘要: A high-tensile-strength steel having excellent toughness throughout its thickness, excellent properties at welded joints, and a tensile strength (TS) of at least about 900 MPa (130 ksi), and a method for making such steel, are provided. Steels according to this invention preferably have the following composition based on % by weight: carbon (C): 0.02% to 0.1%; silicon (Si): not greater than 0.6%; manganese (Mn): 0.2% to 2.5%; nickel (Ni): 0.2% to 1.2%; niobium (Nb): 0.01% to 0.1%; titanium (Ti): 0.005% to 0.03%; aluminum (Al): not greater than 0.1%; nitrogen (N): 0.001% to 0.006%; copper (Cu): 0% to 0.6%; chromium (Cr): 0% to 0.8%; molybdenum (Mo): 0% to 0.6%; vanadium (V): 0% to 0.1%; boron (B): 0% to 0.0025%; and calcium (Ca): 0% to 0.006%. The value of Vs as defined by Vs=C+(Mn/5)+5P−(Ni/10)−(Mo/15)+(Cu/10) is 0.15 to 0.42. P and S among impurities are contained in an amount of not greater than 0.015% and not greater than 0.003%, respectively. The carbide size in the steel is not greater than 5 microns in the longitudinal direction.

    摘要翻译: 提供了其整个厚度具有优异的韧性,在焊接接头处具有优异性能以及至少约900MPa(130ksi)的拉伸强度(TS))的高强度钢及其制造方法。 根据本发明的钢优选具有以重量%计的以下组成:碳(C):0.02%至0.1%; 硅(Si):不大于0.6%; 锰(Mn):0.2〜2.5% 镍(Ni):0.2〜1.2% 铌(Nb):0.01〜0.1% 钛(Ti):0.005〜0.03% 铝(Al):不大于0.1%; 氮(N):0.001〜0.006% 铜(Cu):0〜0.6% 铬(Cr):0〜0.8% 钼(Mo):0〜0.6% 钒(V):0%至0.1%; 硼(B):0〜0.0025% 和钙(Ca):0〜0.006%。 由Vs = C +(Mn / 5)+ 5P-(Ni / 10) - (Mo / 15)+(Cu / 10)定义的Vs的值为0.15〜0.42。 杂质中的P和S的含量分别不大于0.015%且不大于0.003%。 钢中的碳化物尺寸在纵向上不大于5微米。

    High-toughness, high-tensile-strength steel and method of manufacturing the same
    2.
    发明授权
    High-toughness, high-tensile-strength steel and method of manufacturing the same 有权
    高韧性,高抗拉强度的钢及其制造方法

    公开(公告)号:US06183573B2

    公开(公告)日:2001-02-06

    申请号:US09482527

    申请日:2000-01-14

    IPC分类号: C22C3808

    摘要: High-tensile-strength steel having excellent arrestability and a TS of not less than 900 MPa, as well as a method of manufacturing the same. The steel of the invention has the following composition (% by weight): C: 0.02% to 0.1%; Si: not greater than 0.6%; Mn: 0.2% to 2.5%; Ni: greater than 1.2% but not greater than 2.5%; Nb: 0.01% to 0.1%; Ti: 0.005% to 0.03%; N: 0.001% to 0.006%; Al: not greater than 0.1%; and optional elements. Ceq of the B-free steel is 0.53-0.7%, and Ceq of the B-bearing steel is 0.4-0.58%. The microstructure of the steel may be a mixed structure of martensite (M) and lower bainite (LB) occupying at least 90 vol. % in the microstructure, LB occupying at least 2 vol. % in the mixed structure, and the aspect ratio of prior austenite grains is not less than 3.

    摘要翻译: 具有优异的阻滞性和TS不低于900MPa的高强度钢及其制造方法。 本发明的钢具有以下组成(重量%):C:0.02〜0.1% Si:不大于0.6%; Mn:0.2〜2.5% Ni:大于1.2%但不大于2.5%; Nb:0.01〜0.1% Ti:0.005〜0.03% N:0.001〜0.006% Al:不大于0.1%; 和可选元素。 B型钢的Ceq为0.53〜0.7%,B轴钢的Ceq为0.4〜0.58%。 钢的微观结构可以是马氏体(M)和下部贝氏体(LB)的混合结构,其占据至少90体积%。 微观结构中的%,LB占至少2体积。 混合结构中的%,前奥氏体晶粒的纵横比不小于3。

    High-toughness, high-tensile-strength steel and method of manufacturing
the same
    3.
    发明授权
    High-toughness, high-tensile-strength steel and method of manufacturing the same 失效
    高韧性,高抗拉强度的钢及其制造方法

    公开(公告)号:US6045630A

    公开(公告)日:2000-04-04

    申请号:US28574

    申请日:1998-02-24

    摘要: High-tensile-strength steel having excellent arrestability and a TS of not less than 900 MPa, as well as a method of manufacturing the same. The steel of the invention has the following composition (% by weight): C: 0.02% to 0.1%; Si: not greater than 0.6%; Mn: 0.2% to 2.5%; Ni: greater than 1.2% but not greater than 2.5%; Nb: 0.01% to 0.1%; Ti: 0.005% to 0.03%; N: 0.001% to 0.006%; Al: not greater than 0.1%; and optional elements. Ceq of the B-free steel is 0.53-0.7%, and Ceq of the B-bearing steel is 0.4-0.58%. The microstructure of the steel may be a mixed structure of martensite (M) and lower bainite (LB) occupying at least 90 vol. % in the microstructure, LB occupying at least 2 vol. % in the mixed structure, and the aspect ratio of prior austenite grains is not less than 3.

    摘要翻译: 具有优异的阻滞性和TS不低于900MPa的高强度钢及其制造方法。 本发明的钢具有以下组成(重量%):C:0.02〜0.1% Si:不大于0.6%; Mn:0.2〜2.5% Ni:大于1.2%但不大于2.5%; Nb:0.01〜0.1% Ti:0.005〜0.03% N:0.001〜0.006% Al:不大于0.1%; 和可选元素。 B型钢的Ceq为0.53〜0.7%,B轴钢的Ceq为0.4〜0.58%。 钢的微观结构可以是马氏体(M)和下部贝氏体(LB)的混合结构,其占据至少90体积%。 微观结构中的%,LB占至少2体积。 混合结构中的%,前奥氏体晶粒的纵横比不小于3。