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对三种高钢级油井管(C90、G105、P110)的应力松弛特性进行了研究,并测量了这些材料制造的无缝钢管经不同温度温矫后残余应力的变化。结果表明,钢材的化学成分对其应力松弛特性有明显的影响,含碳量低及合金元素铬、钼高的C90钢中的残余应力不易消除,而P110的应力稳定性最低。所以在制订钢管的温矫工艺时,材料的化学成分是不容忽视的因素。
The stress relaxation characteristics of three kinds of high-grade oil well pipe (C90, G105, P110) were studied and the variation of residual stress of the seamless steel pipe made of these materials after being temperature-transformed by different temperature was measured. The results show that the chemical composition of steel has a significant effect on its stress relaxation properties. The residual stress in C90 steel with low carbon content and high chromium and molybdenum alloying elements is not easily eliminated, while the stress stability of P110 is the lowest. Therefore, in formulating the temperature correction of steel pipe technology, the chemical composition of the material can not be ignored.