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STEEL PIPE AND STEEL SHEET

机译:钢管和钢板

摘要

This steel pipe has a base material portion composed of a tubular steel plate having a predetermined chemical composition and a welded part that is provided at a butt portion of the steel plate and extends in the longitudinal direction of the steel plate, an internal microstructure includes 85% or more of one or both of granular bainite and bainite in terms of the total area ratio and includes 1.0% or less of an MA in terms of the area ratio, the internal microstructure has a maximum hardness of 248 Hv or less and an average hardness of 170 to 220 Hv, the base material portion has a texture having an integration degree of {100} of 1.5 or more in a plane parallel to a plate surface at a 1/4 position of a plate thickness from the surface in a plate thickness direction, a surface layer area microstructure includes 95% or more of one or both of granular bainite and tempered bainite in terms of the total area ratio, the surface layer area microstructure has a maximum hardness of 250 Hv or less, and the steel plate has a plate thickness of 15 mm or less.
机译:该钢管具有由具有预定化学组成的管状钢板构成的基材部分,该管状钢板构成具有预定的化学组成和设置在钢板的对接部分处并且在钢板的纵向方向上延伸,内部微观结构包括85粒状贝氏体和贝氏体中的一个或两个在总面积比上的百分比和贝氏体中的一个或两个或更多的mA在面积比下包括1.0%或更少,内部微观结构的最大硬度为248 HV或更低,平均值硬度为170至220HV,基材部分的纹理在平行于板厚度的板厚度的平行于板表面的平面中具有1.5或更多的{100}的整合度。厚度方向,表面层区域微结构包括粒状贝氏体和脾贝氏体中的一个或两种以上的95%或更多,表面层区域微结构的最大硬度为250 HV或L. ESS,钢板的板厚为15mm或更小。

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