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steel pipe 1. Grade: 10#-45#,16Mn,A53-A369,Q235,STB35, 2. Section Shape:Round 3. Standard: ASTM A500,JG 178-2005,JIS G3466,EN10210,GB/T6728-2002,GB/T6725-2002, GBT3094-2000 4. Certification: ISO9001, ...