... .8-111, DIN 17175, GB8163-2008, GB9948-2006, GB8162-20082. Carbon Material:20#, 35#,45#,CK45,ST45,ST55,SA106B3. Alloy Material ... , Wb364. Surface: black painting (or red ) , polished white, hot dipped zinc galvanizing, 3pe, 2pe, 1pe.5. Process Method: hot rolled, cold ... hoop,or as per customer's requirement Best quality Q235 carbon steel pipe Oil gas