1. Size range: 1/2"-28" are made by seamless pipes, above up to 72" are made by welded pipes
2. Thickness: SCH20 SCH40 STD SCH60 SCHXS SCH80 SCH160 SCHXXS etc are available
3. International standards:
American standard: ASTM A234 WPB ANSI B16.9 ,ANSI B16.5 ,API 5L
Japanese standard: JIS B2311, JIS B2312
Germany standard: DIN2605
4. Material: Carbon steel & alloy steel & stainless steel
WPB A234, A106, Q235, ST37.2, GB10#, GB20# ,A304 ,A304L,and alloy steel.
Use: Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc