Grade 304H has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 500°C and up to about 800°C. 304H will become sensitized in the temperature range of 425-860°C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.
The outer diameter of 304H stainless steel pipes typically ranges from 1/8 inch (3.175 mm) to 48 inches (1219.2 mm) or even larger. The common standard sizes for industrial applications are often available in increments of 1/8 inch or 1/4 inch.
| UNS | JIS | WERKSTOFF NR. | EN | GB | AFNOR |
|---|---|---|---|---|---|
| S30409 | SUS304H | 1.4948 | X6CrNi18-10 | 0Cr18Ni9 | Z7CN18-09 |
Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| - | Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Nickel |
|---|---|---|---|---|---|---|---|
| min. (%) | 0.04 | - | - | - | - | 18.00 | 8.00 |
| max. (%) | 0.10 | 2.00 | 0.045 | 0.030 | 0.75 | 20.00 | 10.50 |
| - | Tensile Strength | Yield Strength [%0.2] | Elongation | Hardness (Rockwell B) |
|---|---|---|---|---|
| min. | 75 ksi [517 MPa] | 30 ksi [205 MPa] | 40% | - |
| max. | - | - | - | 92 HRB |
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