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API 5L PSL2 X42 X52 NACE seamless steel pipe 219 273 325mm NACE MR 0175 steel tube Specification Standard ASTM A182-2001, JIS G3454-2007 Grade Cr5Mo, 12CR2MO, 34CrMo4, Cr5MoG, Cr17Ni8, 1Cr13Mn9Ni1N, ...