... tube per ASTM A106B 2)Size: 1/4"-28"*SCH20\30\STD\60\80\100\120\140\ ... \XXS steel tube per ASTM A106/A53/API-5L.GR.B 2) Application: pipes for usual structure and machines 3) Model ... No.: ASTM A106 grade A/B, API 5L, X52, X42, ST52, K55, STK490, STPG, C20,etc ... implemented: DIN, JIS, ASTM (ASME),etc 1)Seamless steel tube per ASTM A106B2)Size: 1/4"-28"*SCH20\30\STD\60\80 ...