一种X100管线钢埋弧焊丝的研究与开发

从高强度低合金钢(HSLA)焊缝熔敷金属中的针状铁素体和贝氏体形核机理出发,选择Mn-Ni-Mo-Cr作为焊丝设计的主要合金系,以微合金元素Ti,B,Ce促进针状铁素体形核,降低C,Si,P,S,N元素的影响,并将碳降至超低碳水平,以适应大热输入焊接;与此同时保证Mn,Mo,Cr元素含量以弥补降低碳、硅带来的强度损失....

Research and development of a new submerged arc welding wire for X100 pipeline steel

According to the nucleate mechanics of acicular ferrite and bainite in high strength low alloy steels(HSLA) welded deposit,Mn-Ni-Mo-Cr was chosen as main alloy elements and Ce,Ti,B as micro-alloy elements which accelerate the nucleate of acicular ferrite.The content of C,Si,P,S,N elements was reduced and C to be the level of ultra-low carbon to meet the large energy input welding,and to ensure the content of Mn,Mo,Cr to compensate for intensity loss brought by reduced C,Si.By in addition,Ti and B were added to avoid producing excessive acicular ferrite which would reduce the intensity or cause segregation of alloy elements to decrease the toughness of weld joint and proper Cu to enhance the ability of weld joint to resist the atmospheric corrosion.As the results,the developed welding wire matching flux SJ101-G,had the microstructure of deposited metal was acicular ferrite and lath bainite mainly in which a small amount of granular bainite precipitated and dispersed.