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Stainless steels are high-alloy steels which have high corrosion resistance than other steels owing to the presence of large amounts of chromium in the range of 4 to 30%.
Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. In addititon, they form another group known as precipitation-hardened steels, which are a combination of martensitic and austenitic steels.The following datasheet will provide more details about grade 329H stainless steel, which has slightly lower alloy content than grade 2205, and is inexpensive.
The following table shows the chemical composition of grade 329H stainless steel.
| Element | Content (%) |
|---|---|
| Iron, Fe | 63 |
| Chromium, Cr | 28 |
| Nickel, Ni | 4.5 |
| Manganese, Mn | 2 |
| Molybdenum, Mo | 1.5 |
| Silicon, Si | 1 |
| Carbon, C | 0.10 |
| Phosphorous, P | 0.040 |
| Sulfur, S | 0.030 |
The physical properties of grade 329H stainless steel are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm3 | 0.282 lb/in³ |
The mechanical properties of annealed grade 329H stainless steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate | 725 MPa | 105000 psi |
| Tensile strength, yield (@0.2%) | 550 MPa | 79800 psi |
| Charpy impact | 54 J | 39.8 ft-lb |
| Elastic modulus | 190 – 210 GPa | 27557 – 30458 ksi |
| Poisson’s ratio | 0.27 – 0.30 | 0.27 – 0.30 |
| Elongation at break (in 50 mm) | 25% | 25% |
| Hardness, Brinell | 230 | 230 |
| Hardness, Knoop (converted from Brinell hardness) | 253 | 253 |
| Hardness, Rockwell B | 96 | 96 |
| Hardness, Rockwell C (converted from Brinell hardness) | 20 | 20 |
| Hardness, Vickers (converted from Brinell hardness) | 242 | 242 |
The following table outlines the thermal properties of grade 329H stainless steel.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-815°C/68-1500°F) | 14.4 µm/m°C | 8 µin/in°F |
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