ALLOYS
304/304L
304/304L is a variation of the basic 18-8 grade, Type 302, with a higher chromium and lower carbon content. Lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. It is the most versatile and widely used of all the stainless steels.
UNS: S30400/S30403
Stock Sizes: 1/8” – 8” OD
Specifications:
- Seamless Tube: ASTM A213/A269
- Welded Tube: ASTM A249/A269
- Seamless Mechanical Tube: ASTM A511
- Welded Mechanical Tube: ASTM A554
- Welded & Seamless Pipe: ASTM A312
- NACE MR0175/MR0103
Available Processing:
- Cold Worked and Bright Annealed
- Cold Worked, Annealed, and Pickled
- Cold Worked
- Hot Finished
Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification
Chemical Composition (%)
| Chemical | Percentage |
|---|---|
| Iron (Fe) | Balance |
| Chromium (Cr) | 18-20% |
| Nickel (Ni) | 8-12% |
| Nickel (Ni) - A554/A511 | 8-11% |
| Molybdenum (Mo) | – |
| Manganese (Mn) | 2% Max |
| Silicon (Si) | 1% Max |
| Carbon (C) | 0.035% Max |
| Chemical | Percentage |
|---|---|
| Sulfur (S) | 0.030% Max |
| Phosphorus (P) | 0.045% Max |
| – | – |
| – | – |
| – | – |
| – | – |
| – | – |
| – | – |
Physical Properties
| Property | Measurement |
|---|---|
| Density (lb/in3) | 0.285 |
| Elongation (min %) | 35 |
| Minimum Yield (psi) | 30,000 |
| Minimum Tensile (psi) | 75,000 |
| Max Hardness (HRB) | 90 |