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Seamless 304 stainless steel pipe is a hollow cross-section, seamless round or special-shaped steel pipe, made of steel ingot or solid tube billet through perforation, hot rolling/cold rolling/cold drawing process, containing 18-20% chromium, 8-11% nickel, carbon content ≤0.08%, forming a stable austenite structure, non-magnetic.
304 stainless steel cold-rolled pipe performs well in air, water, steam and weakly corrosive media (such as nitric acid), but its pitting resistance in chloride ion environment is inferior to that of molybdenum-containing 316 series, and its high temperature resistance range is -196°C to 800°C.
|
Material Grade |
TP304 (ASTM A312 / ASTM A213/EN 10216-5) |
|
Nominal Pipe Size (NPS) |
1/8" to 24" (0.25" to 24") |
|
Outer Diameter (OD) |
6 mm to 610 mm (0.236" to 24") |
|
Wall Thickness |
Schedule 5S, 10S, 20, 30, 40S, 60, 80S, 100, 120, 140, 160, XXS (varies by size) |
|
Length |
Standard: 6 m (20 ft) or custom |
|
Tolerances |
OD: ±0.2 mm; Wall Thickness: ±10%; Length: ±0.5 mm |
|
Surface Finish |
Annealed, pickled, polished (e.g., 2B, BA, mirror) |
|
Testing Standards |
EN 10204/3.1B, NACE MR0175, PMI testing |
|
Grade |
C (Max) |
Si (Max) |
Mn (Max) |
P (Max) |
S (Max) |
Cr |
Ni |
N (Max) |
|
304 |
0.08 |
1.00 |
2.00 |
0.045 |
0.030 |
18.0-20.0 |
8.0-11.0 |
0.10 |
|
Property |
Value |
|
Tensile Strength (MPa) |
≥515 |
|
Yield Strength (0.2% Offset, MPa) |
≥205 |
|
Elongation (%) |
≥35 |
|
Hardness (HRB) |
≤90 |
- GNEE has passed ASTM A312, ASME SA312, EN 10216-5 and other certifications, and complies with FDA and 3A sanitary standards (suitable for food contact).
- Strict testing process: Including ultrasonic testing (UT), magnetic particle testing (MT), and spectral analysis (PMI) to ensure that there are no defects such as cracks and inclusions.
- Traceability management: Provide furnace number and batch report to support full process quality traceability.
Q: Is 304 stainless steel completely rust-proof?
A: No, it will still rust under certain conditions (such as long-term contact with chloride ions or acidic substances) and requires regular maintenance.
Q: Can 304 stainless steel replace 316L?
A: No. 316L contains molybdenum (Mo) and has a stronger resistance to chloride ion corrosion. It is suitable for marine or medical equipment. 304 cannot meet the needs of these scenarios.
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