The invention relates to a steel pipe used for drilling rod with yield strength greater than 1138MPa and its manufacturing method. The steel is made into billet according to the following components. The composition is composed of C:0.22 to 0.28%, Si:0.15 to 0.20%, Mn:0.4 to 0.7%, Cr:1.3 to 1.6%, Mo:0.7 ~ 1%, Ni:1.5 to 1.9%, Nb:0.07 by mass percentage. 0.15%, S < 0.004% and P less than 0.01%, the rest are iron and unavoidable impurities; the steel billet is heated evenly, and the steel pipe is obtained. The steel pipe is heat treated, water cooling to room temperature, and the steel pipe of drill rod with yield strength greater than 1138MPa is obtained. Through reasonable control of the content of C, Si, Cr, Mn, Mo, Ni, Nb, S and P elements, the invention ensures the uniform and fine structure of the tissue by water cooling. At the same time, the deformation and residual stress are controlled in a very low range, so that the high strength and toughness of the drill pipe can be matched.
【技术实现步骤摘要】
一种屈服强度大于1138MPa的钻杆用钢管及其制造方法
本专利技术涉及一种钻杆用钢管及其制造方法,尤其涉及一种屈服强度大于1138MPa的钻杆用钢管及其制造方法。
技术介绍
钻杆是石油天然气钻井作业的一种重要工具。为了满足深层油气钻井开发的需求,钻杆制造商相继设计开发了强度达1138MPa(165ksi)的高强度钻杆。专利CN103938095B提出一种165ksi钢级高强度高韧钻杆及其制造方法,其成分质量百分比为C:0.20-0.40%,Mn:0.50-1.40%,Cr:0.50-1.40%,Mo:0.60-2.10%,Ti:0.005~0.025%,Nb:0.03~0.10%,V:0.02~0.15%,Si:0.20~0.40%,Al≤0.05%,N≤0.10%,P≤0.015%,S≤0.008%,其余为铁和不可避免的杂质。且Mn减小值=(3~6)×C增加值,[Nb]+[V]+[Ti]≤0.25%,5≤[Nb]/[Ti]≤10,1%≤[Cr]+[Mo]≤3%,钻杆屈服强度可达1138MPa(165ksi)。专利CN102268609A提出了一种超高强度高韧性钻杆管体及其热处理工艺,采用低Mn元素含量,通过添加V元素(0.1~0.3%)进行微合金化,钻杆管体的化学成分为C:0.20~0.28%,Mn:0.50~0.6%,P≤0.010%,S≤0.005%,V:0.1~0.3%,Al≤0.03%,1.5%≤Cr+Mo+Ni≤3.0%,其余为Fe及痕量元素,其热处理工艺包括两次淬火和一次回火,其屈服强度可达150~180ksi(1033~1240MPa)。采 ...
【技术保护点】
1.一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:按质量百分比计,其成分组成为:C:0.22~0.28%、Si:0.15~0.20%、Mn:0.4~0.7%、Cr:1.3~1.6%、Mo:0.7~1.0%、Ni:1.5~1.9%、Nb:0.07~0.15%、S≤0.004%和P≤0.01%,其余为铁和不可避免的杂质。
【技术特征摘要】
1.一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:按质量百分比计,其成分组成为:C:0.22~0.28%、Si:0.15~0.20%、Mn:0.4~0.7%、Cr:1.3~1.6%、Mo:0.7~1.0%、Ni:1.5~1.9%、Nb:0.07~0.15%、S≤0.004%和P≤0.01%,其余为铁和不可避免的杂质。2.根据权利要求1所述的一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:该钢管的屈服强度大于1138MPa,抗拉强度大于1206MPa,伸长率大于13%,-20℃条件下的冲击吸收能大于100J。3.根据权利要求1或2所述的一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:该钢管的屈服强度在1208~1255MPa,抗拉强度在1290~1315MPa,伸长率在19~20%,-20℃条件下的冲击吸收能在110~117J。4.根据权利要求1所述的一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:按质量百分比计,其成分组成为:C:0.25~0.28%、Si:0.16~0.18%、Mn:0.49~0.61%、Cr:1.20~1.42%、Mo:0.79~0.86%、Ni:1.50~1.72%、Nb:0.07~0.10%、S≤0.004%和P≤0.01%,其余为铁和不可避免的杂质。5.根据权利要求1所述的一种屈服强度大于1138MPa的钻杆用钢管,其特征在于:按质量百分比计,...
【专利技术属性】
技术研发人员:李方坡,王建军,冯耀荣,韩礼红,
申请(专利权)人:中国石油天然气集团有限公司,中国石油天然气集团公司管材研究所,
类型:发明
国别省市:北京,11
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。