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BK/BKW/BKS/GBK/NBK Cold Drawn Seamless Steel Tube 1. Implementation of standards: DIN2391-1, EN10305-1, GB8163, ASTMA179, ASTMA192 etc 2. Material: Steel No. 10#, 20#, 35#, 45#, St37, St45, St52, 40cr...