What material is STK 400 erw pipe
STK400 electric resistance welded pipe is a carbon structural steel pipe that complies with Japanese Industrial Standard (JIS).
What are the mechanical properties of STK400 electric resistance welded pipe?
The mechanical properties of STK400 meet the requirements of JIS standards:
- Tensile strength: ≥400 MPa, which can meet the load-bearing requirements of general structural parts.
- Yield strength: ≥245 MPa, providing stable deformation resistance.
- Elongation: ≥17%, indicating that the material has good plastic deformation ability before breaking and can adapt to impact or vibration environments.
In addition, its Brinell hardness (HB) is usually in the range of 120-160, balancing wear resistance and processing convenience.
What is the difference between STK400 and SS400?
SS400: hot-rolled steel plate/profile, with the same tensile strength of 400MPa, but STK400 refers specifically to electric resistance welded pipes (ERW pipes);
Process difference: STK400 uses high-frequency resistance welding to roll and weld steel strips into pipes, while SS400 is a rolled plate.
