Product name ERW carbon steel pipe (HFW/HFI) Out Diameter 21.3mm ... SCH60, SCH80S, XS, SCH80 etc. Length 1m-24m Standard API 5L, API 5CT, ASTM A53, ASTM A252, ASTM A500, ASTM A795 ... class, prime, newly produced, secondary , stock etc. Material/Steel grade A, B, X42, X46, X52, X56, X60, ... , STK500, STK540,STPG370, STPG410 etc. Certificate EN10217, EN10219, API 5L PSL1/ PSL2, KS 4602, KS3583, GB/T9711.1/2 ...