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17
YRS
Shandong Zhongzheng Steel Pipe Manfucaturing Co., Ltd.
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seamless steel pipe-API 5L GRB ST44 ST42
Black Steel Pipe-ASTM A53 GRB
Mechanical tubes ASTM A106 ,STPG370,ST52
Fluid Pipe-ASTM A106 GRB,API 5L GRB
High press boiler pipe
Alloy seamless steel pipe
Large-diameter thick-walled seamless tube