309S
309S is a free-cutting stainless steel containing sulfur, used where easy cutting and high surface finish are primarily required. 309s are lower in carbon content
A variant of 309 stainless steel used where welding is required. Lower carbon content allows carbonization to precipitate in the heat-affected zone close to the weld The precipitation of carbides may cause intergranular corrosion (welding corrosion) of stainless steel in certain environments.
Its high chromium content and nickel content ensure good corrosion resistance and oxidation resistance. Compared with austenitic 304 alloy, it The intensity should be higher.
Content
Chemical composition of 309S(%)
| Element | Minimun % | Maximum % |
|---|---|---|
| Cr | 17 | 19 |
| C | - | 0.08 |
| Mn | - | 2 |
| Si | - | 1 |
| P | - | 0.035 |
| S | - | 0.03 |
| Ni | 9 | 12 |
| Ti | 5*C% | - |
Physical properties of 309S
| Tensile Strength σb MPa | ≥520 |
|---|---|
| Yield Strength σ0.2MPa | ≥205 |
| Elongation δ5% | ≥40 |
| Section shrinkage ψ (%): | ≥50 |
| Hardness: | ≤187HB;≤90HRB;≤200HV |
Applications of 309S
Widely used in important fields such as boilers, energy (nuclear power, thermal power, fuel cells), industrial furnaces, incinerators, heating furnaces, chemical industry, petrochemical industry, etc.domain.
