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Introduction
Stainless steels are high-alloy steels that have excellent corrosion resistance in comparison with other steels as they contain more chromium.
Based on their crystalline structure, stainless steels are divided into three groups, namely, martensitic, austenitic and ferritic steels. A combination of martensitic and ferritic steels forms a fourth group known as precipitation-hardened steels.
The following datasheet provides an overview of grade 444 stainless steel.
The chemical composition of grade 444 stainless steel is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 77.475 |
| Chromium, Cr | 18.5 |
| Molybdenum, Mo | 2 |
| Nickel, Ni | 1 |
| Manganese, Mn | 1 |
| Silicon, Si | 1 |
| Carbon, C | 0.025 |
The following table shows the physical properties of grade 444 stainless steel.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm3 | 0.282 lb/in³ |
The mechanical properties of grade 444 stainless steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 415 MPa | 60200 psi |
| Yield strength (@strain 0.200%) | 275 MPa | 39900 psi |
| Elastic modulus | 200 GPa | 29000 ksi |
| Shear modulus | 80-83 GPa | 11600-12000 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 20% | 20% |
| Hardness, Rockwell B | 95 | 95 |
The thermal properties of grade 444 stainless steel are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient | 10 µm/m°C | 5.56 µin/in°F |
| Thermal conductivity | 26.8 W/mK | 186 BTU in/hr.ft².°F |
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