2、管线管（Line pipe）产品标准：API SPEC 5L 用途：用于石油、天然气工业中的气、水、油输送标准Standard钢级Grade抗拉强度(MPa)Tensile Strength屈服强度(MPa)Yield Strength延伸率(%)ElongationAPI SPEC 5LPSL1查API Spec 5L表3See API Spec 5L, Table 3A25310172A331207B414241X42414290X46434317X52455359X56490386X60517414X65531448X70565483PSL2 min.max.min.max.B414758241448X42414758290496X46434758317524X52455758359531X56490758386544X60517758414565X65531758448600X70565758483621X80621827552690