Introduction
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 347H stainless steel, which is slightly tougher than grade 304 steel.
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 |
Physical Properties
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 |
Mechanical Properties
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 |
Post time: Mar-30-2023