ASTM A358 CL1 TP304 TP304H TP316L TP317L TP347 Stainless Steel Welded Pipe
ASTM A358 CL1 TP304 TP304H TP316L TP317L TP347 Stainless Steel Welded Pipe
ASTM A358 CL1 Stainless Steel Welded Pipe
Standard: ASTM A358/A358M – Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service
Grade: CL1 (Class 1)
Application: High-temperature service in pressure systems (e.g., boilers, heat exchangers, petrochemical plants).
Type: Electric-fusion-welded (EFW) austenitic stainless steel pipes.
2. Material Grades
ASTM A358 CL1 typically uses 304/304L or 316/316L stainless steel. Key chemical compositions (approximate):
| Grade | Cr (%) | Ni (%) | Mo (%) | C (%) |
|---|---|---|---|---|
| 304 | 18-20 | 8-10.5 | – | ≤0.08 |
| 304L | 18-20 | 8-12 | – | ≤0.03 |
| 316 | 16-18 | 10-14 | 2-3 | ≤0.08 |
| 316L | 16-18 | 10-14 | 2-3 | ≤0.03 |
3. Mechanical Properties
| Property | Requirements | Test Standard |
|---|---|---|
| Yield Strength (MPa) | ≥205 (304/304L) / ≥205 (316/316L) | ASTM E8/E8M |
| Tensile Strength (MPa) | ≥515 (304/304L) / ≥515 (316/316L) | ASTM E8/E8M |
| Elongation (%) | ≥35 (min) | ASTM E8/E8M |
4. Dimensions & Tolerances
Size Range: Typically ½" to 24" nominal diameter.
Wall Thickness: Varies per schedule (e.g., Sch 40, Sch 80).
Tolerances: Conforms to ASTM A403/A403M for welded pipe dimensions.
5. Surface Finish
Welded Joint: May require post-weld heat treatment (PWHT) or pickling/passivation to ensure corrosion resistance.
General Finish: Smooth internal/external surfaces, free of defects.
6. Special Requirements
Pressure Testing: Hydrostatic or non-destructive testing (NDT) per ASTM A370.
Heat Treatment: Solution annealing for 304/316 grades to optimize corrosion resistance.
7. Applications
High-temperature and high-pressure pipelines.
Power generation (boilers, condensers).
Petrochemical and chemical processing.
Food and pharmaceutical equipment (when polished).
