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API 5L ASTM A 106 16 to 30 grade B sch 40 80 120 seamless steel tubesSeamless steel pipes black varnishing, US $ 0.85 - 1.25 / Kilogram, API, ASTM, ASTM A 106 grade A sch std 4080, API 5CT, ANSI A213-2001, 10#-45#.Source from Wenzhou Design Trade Co., Ltd. on Waimaotong.com.