... inch to 20 inch SKP: crossapplegbm carbon steel pipe OD1/4"-40",13mm-1000mmWTSCH5,SCH10,SCH20,,SCH60,SCH80,SCH100,SCH120,SCH160 ... ; STB42; STS42; STS49; STPT493. DIN:ST33;ST38ST35;ST42;ST45;ST52.4;ST52; TT St35N;10Ni14;15Mo34. API:APL 5LAPI 5CT ;API ... both ends5. galvanizedUsage Range1. structral pipe2. oil or gas transportation3. fluid pipe4. line pipe5. drill pipe6. boiler pipe7. other uses we ...