API 5L / ASTM A106 /a179 q345b A53 42CrMo 15CrMo 4130 grad b 30 inch carbon seamless galvanized carbon steel pipe
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API 5L / ASTM A106 /a179 q345b A53 42CrMo 15CrMo 4130 grad b 30 inch carbon seamless galvanized carbon steel pipe