Kaalaman sa steel pipe: API 5L seamless steel pipe ay seamless steel pipe API 5L seamless steel pipe ay seamless steel pipe, seamless steel pipe, pipeline steel material: GR.B, X42, X46, 52, X56, X60, X65, X70.Ang linyang tubo ay ginagamit upang maghatid ng langis, gas at tubig na binomba o...
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