Report copyright - BESTAR STEEL CO., LTD. · BESTAR STEEL CO., LTD. Seamless Steel Tubes from Heat-resisting Steels. Seamless steel tubes from heat-resisting steels Size: ∮10.3-720mm*1.2-120mm . Grade:St35.8、St45.8、17Mn4、19Mn5、15Mo3、13CrMo44、
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