2101 Duplex
Data verified2101 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.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.040 |
| Si | ≤1.00 |
| Mn | 4.00–6.00 |
| P | ≤0.040 |
| S | ≤0.030 |
| Cr | 21.00–22.00 |
| Ni | 1.35–1.70 |
| Mo | 0.10–0.80 |
| Cu | ≤1.00 |
| N | 0.20–0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Solution annealed |
| Hardness | ≤290 HB |
| Tensile strength | 650–880 MPa |
| Yield strength | ≥450 MPa |
| Density | 7.80 g/cm³ |
| Magnetic | Yes |
Heat treatment
Solution anneal 1020–1100 °C, rapid cool (water). Keep the ferrite-austenite balance near 50/50; avoid prolonged heating at 300–950 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4162 |
| aisi | UNS S32101 |
Compare side by side: 2101 Duplex vs 2304 Duplex · 2101 Duplex vs 2205 Duplex
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Storage tanks, structural sections, bridges, water treatment, pulp and paper, handrails.
Processing: Weldable with duplex fillers and controlled heat input; high strength raises forming forces and springback; pickling after welding restores corrosion performance.
FAQ
- What does lean duplex mean?
- A duplex grade with low nickel and molybdenum (nickel replaced by manganese and nitrogen). It cuts cost and price volatility while keeping duplex strength and stress-corrosion resistance.
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Ask for a quotationVisit NasteelSource: ASTM A240 published ranges (UNS S32101) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.