高强高韧性管线钢埋弧用焊丝的研制

Development of Submerged Arc Welding Wire for High Strength and High Toughness Pipeline Steel

研制的高强高韧性管线钢用埋弧焊丝与SJ10 1和SJ10 2焊剂匹配后的熔敷金属不仅具有很高的强度 (σs≥ 5 4 0MPa) ,而且还具有优良的低温韧性 (AKv - 1 0℃ ≥ 12 0J)。该焊丝的研制满足了屈服强度超过 5 0 0MPa以上管线钢对焊缝熔敷金属性能的要求。研究结果表明 ,要保证熔敷金属具有较佳的强韧性匹配 ,熔敷金属中的合金元素总量必须满足Ceq≥ 0 .38,Pcm≥ 0 .17,才能保证熔敷金属的强度 ,以及具有以针状铁素体为主焊缝组织 ;在文中的合金系统下 ,随着熔敷金属中C、Mn元素含量的增加 ,熔敷金属的针状铁素体组织的含量增加 ,韧性得到提高。随着焊剂碱度值的增加 ,熔敷金属中的氧含量降低 ,C、Mn元素增加 ,使得熔敷金属中的合金元素更趋向于最佳的配比 ,从而提高了韧性。

The wire for high strength and toughness pipeline steel submerged arc welding is developed in this paper,the deposited metals obtained by matching SJ101 and SJ102 type flux,has not only high strength( σ s≥540MPa) and also has high low temperature toughness ( A KV 10 ℃ ≥120 J).This wire fulfills the requirement of high strength( σ s>500 MPa) pipeline steel to the properties of the deposited metals.Experimental results show that C eq and P cm should be higher than 0.38 and 0.17 respectively,which can ensure the high strength and high toughness of the deposited metals.With increasing C,Mn content,the acicular ferrite is increased,and the toughness is improved. is deleterious to the toughness of deposited metals,with the increasing content,the toughness is lowered.Higher basicity flux increased the C,Mn contents and lowered the contents,which made the deposited wetals chemical composition to tend to more suitable and improved the toughness.