ELBOW size:1/2"-80" material: carbon standards:ASTM,JIS,DIN,GB 1. Name: Carbon seamless elbow2. Standards: AMSE,JIS,DIN,GB124593. Size: 1/2''- 80''4. Material: carbon steel:20#,A3,Q235 A,20G,16Mn,ASTM A105,etc alloy steel:16Mn R,12cr1Mov,10CrMo910,15CrMo,12Cr2Mo1,A335 P225. Application range: Petroleum,chemical,power,gas,metallurgy,shipbuilding,construction,etc.6. CE and certification: ISO 9001: ...