2101 Duplex vs 2304 Duplex
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
2101 Duplex
Stainless Steel
2101 is a lean duplex stainless in which manganese and nitrogen replace most of the nickel, giving roughly twice the yield strength of 304 at a stable, lower price. Corrosion resistance is comparable to 316L in many mild environments, with far better stress-corrosion resistance.
Standards: DIN 1.4162 · AISI UNS S32101
2304 Duplex
Stainless Steel
2304 is a lean duplex grade with corrosion resistance comparable to 316L and roughly double its yield strength, without the molybdenum cost of 2205. It is used for tanks, structural parts and bridges in mildly aggressive environments.
Standards: DIN 1.4362 · AISI UNS S32304 · GB 022Cr23Ni4MoCuN
Chemical composition compared (%)
| Element | 2101 Duplex | 2304 Duplex |
|---|---|---|
| C | ≤0.040 | ≤0.030 |
| Si | ≤1.00 | ≤1.00 |
| Mn | 4.00–6.00 | ≤2.50 |
| P | ≤0.040 | ≤0.040 |
| S | ≤0.030 | ≤0.030 |
| Cr | 21.00–22.00 | 21.50–24.50 |
| Ni | 1.35–1.70 | 3.00–5.50 |
| Mo | 0.10–0.80 | 0.05–0.60 |
| Cu | ≤1.00 | 0.05–0.60 |
| N | 0.20–0.25 | 0.05–0.20 |
Properties compared
| Property | 2101 Duplex | 2304 Duplex |
|---|---|---|
| Delivery condition | Solution annealed | Solution annealed |
| Hardness | ≤290 HB | ≤290 HB |
| Tensile strength | 650–880 MPa | 600–820 MPa |
| Yield strength | ≥450 MPa | ≥400 MPa |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Magnetic | Yes | Yes |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 2101 Duplex · 2304 Duplex. Substitution decisions for certified parts stay with the design authority.