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seamless steel pipes factory STD API-5L API-5CT GB/T8162-1999 GB/T8163-1999 GB/T3087-1999 GB/T5310-1995 SY/T5037-2000 MAT 10# 20# 45# 15CrMo 1Cr18Ni9Ti H40 J55 K55 N80 P110 Gr B Grade X42~X70 W.T 6...