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常看到石油管线钢用X65、X75、X120等表示等级,这是美国石油学会(API)规定的以管线钢屈服强度(σ(?))的高低表示的,X95表示其屈服强度极限达到95 000磅/平方英寸(约667 MPa).X120管线钢的屈服极限应达到120 000磅/平方英寸(约827 MPa).屈服强度越高,表明管线钢的性能越好.目前,日本森美孚化工(ExxonMobil)公司和新日铁正在共同进行超高强度X120管线钢的开发,以大幅度提高强度来达到降低管线钢成本的目的.
Often see the oil pipeline steel with X65, X75, X120 grade, which is the American Petroleum Institute (API) to the pipeline steel yield strength (σ (?)) Said the level of X95 said its yield strength limit of 95 000 psi (about 667 MPa). The yield limit of X120 pipeline steel should reach 120,000 psi (about 827 MPa). Higher yield strength indicates better performance for pipeline steels. Currently, Japan’s Mobil Chemical ExxonMobil Corporation and Nippon Steel are jointly developing the ultra-high-strength X120 pipeline steel to achieve the purpose of reducing the cost of pipeline steel by greatly increasing the strength.