... . EN10216-2 Carbon Steel Seamless Pipes/Tubes: 1.API 5CT 2.API 5L 3.ASTM A53 ,A106, A179,A192,A199,A210,A213,A333,A334,A556 4 ... .DIN 17175,1629,2391,2440,2393 5. BS 970,3059 Carbon Steel ... Welded Pipes/Tubes: 1. API 5CT 2. API 5L 3. ASTM A135,A53,A252,A500 4. DIN ...