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Chemical Composition
The following table shows the chemical composition of grade 347H stainless steel.
| Element | Content (%) |
|---|---|
| Iron, Fe | 62.83 - 73.64 |
| Chromium, Cr | 17 - 20 |
| Nickel, Ni | 9 - 13 |
| Manganese, Mn | 2 |
| Silicon, Si | 1 |
| Niobium, Nb (Columbium, Cb) | 0.320 - 1 |
| Carbon, C | 0.04 - 0.10 |
| Phosphorous, P | 0.040 |
| Sulfur, S | 0.030 |
The physical properties of grade 347H stainless steel are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.7 – 8.03 g/cm3 | 0.278 – 0.290 lb/in³ |
The mechanical properties of grade 347H stainless steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate | 480 MPa | 69600 psi |
| Tensile strength, yield | 205 MPa | 29700 psi |
| Rupture strength (@750°C/1380°F, time 100,000 hours) | 38 - 39 MPa, | 5510 - 5660 psi |
| Elastic modulus | 190 – 210 GPa | 27557 – 30458 ksi |
| Poisson’s ratio | 0.27 – 0.30 | 0.27 – 0.30 |
| Elongation at break | 29% | 29% |
| Hardness, Brinell | 187 | 187 |
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