A submerged arc welding wire for X80 hot-ironing pipe weld seam with tensile strength of 650 MPa or more than 650 MPa for submerged arc welding wire for X80 hot-ironing pipe welding seam is composed of C:0.04-0.10%, Si:0.16-0.35%, Si:0.16-0.35%, Mn:1.60-2.10%, P<0.015%, P<0 0 0 0 0 0 0 0 0 0 0 0 0.015%, S<0.01%, Ni:0.20-0.50%, Mo:0.25-0.45%, Cu:0.01-0.01-0 0.2%, Ti:0.05-0.05-0.15%, Nb:0.035-0.035%, Nb:0.035 005-0.02%, and to meet: 0.10% less than Ti+Nb+V less than 0.20%. After heating, water quenching and tempering, the tensile strength of the weld seam reaches 630 MPa and the impact energy of the weld seam is much higher than 80J at 20 C. The weld metal has acicular ferrite, a small amount of pre eutectoid ferrite and bainite structure, and precipitates at nano (< 100Na), nano (< 100Na~micron) and micron levels, which prevents the weld grain from coarsening and keeps the weld seam still. It can maintain excellent strength and toughness, and reduce the cost of welding wire.
【技术实现步骤摘要】
一种X80热煨管用焊缝抗拉强度≥650MPa的埋弧焊丝
本专利技术涉及一种埋弧焊丝,确切地属于一种X80热煨管用的埋弧焊丝。适用于X80级管线钢埋弧焊及随后的加热水淬回火工艺制作热煨管,也可用于同强度级别钢(Rm630MPa)类似工艺焊件的制作。
技术介绍
石油天然气管道是国家能源最为重要的设施之一,长输管道要通过许多地形起伏弯折地带,因此需要大量弯管。目前热弯管普遍采用直缝焊管经在线加热后进行煨制,然后进行管内外水淬,再回火处理,保证煨制后的弯管具有良好的强韧性匹配。焊态焊缝是铸态组织,煨制过程中焊缝经历了奥氏体化、快速冷却及回火,其组织和性能将发生变化,在经这种煨制工艺处理,钢管上经焊缝仍需具有满足技术要求的强韧性,对于X80管线来说,煨制后焊缝需满足强度Rm≥630MPa,韧性-20℃KV2≥80J。这给焊缝带来了很大的挑战。经检索:中国专利公开号为CN103240512的文献,其公开了一种K65耐低温热煨管母管生产的焊接工艺,其包括预焊、内焊和外焊,采用混合焊丝焊接,第一、三丝为H08MnMoTiB,第二、四丝为SANi3。其中H08MnMoTiB为国标焊丝,SANi3外标焊丝,查得SANi3焊丝成分为(wt%)C≤0.13,Si0.05~0.30,Mn0.60~1.20,Ni3.10~3.80,Cr≤0.15,Cu≤0.35。钢管采用JCO成型后,用气保焊预焊,内焊及外焊均为四丝埋弧焊,第一丝直流反接,第二至四丝为交流。焊缝成分为(wt%)C0.04~0.05,Mn1.60~1.80,Ni0.20~0.70,Mo0.007~0.10,Ti0.00 ...
【技术保护点】
1.一种X80热煨管用焊缝抗拉强度≥650MPa的埋弧焊丝,其组分及重量百分比含量为:C:0.04~0.10%,Si:0.16~0.35%, Mn:1.60~2.10%, P≤0.015%, S≤0.01%, Ni:0.20~0.50%, Mo:0.25~0.45%, Cu:0.01~0.2%, Ti:0.05~0.15%, Nb:0.035~0.085%,B:0.002~0.008%%, V:0.005~0.02%, 并要满足:0.10%≤Ti+Nb+V≤0.20%, 其余为Fe及不可避免的杂质元素。
【技术特征摘要】
1.一种X80热煨管用焊缝抗拉强度≥650MPa的埋弧焊丝,其组分及重量百分比含量为:C:0.04~0.10%,Si:0.16~0.35%,Mn:1.60~2.10%,P≤0.015%,S≤0.01%,Ni:0.20~0.50%,Mo:0.25~0.45%,Cu:0.01~0.2%,Ti:0.05~0.15%,Nb:0.035~0.085%,B:0.002~0.008%%,V:0.005~0.02%,并要满足:0.10%≤Ti+Nb+V≤0.20%,其余为Fe及不可避免的杂质元素。2.如权利要求1所述的一种X80热煨管用焊缝抗拉强度≥650MPa的埋弧焊丝,其特征在于:所述Mn的重量百分比含量在1.68~2.0%。3.如权利要求1所述的一种X80热煨...
【专利技术属性】
技术研发人员:黄治军,牟文广,方要治,徐进桥,刘文艳,郑绍鹏,何嘉,
申请(专利权)人:武汉钢铁有限公司,
类型:发明
国别省市:湖北,42
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