1.3964, X2CrNiMnMoNNb21-16-5-3, S20910, XM-19
XM-19 (UNS S20910), also known as 1.3964 (DIN), X2CrNiMnMoNNb21-16-5-3 (EN), is a high-nitrogen, austenitic stainless steel with exceptional strength, corrosion resistance, and weldability. It is widely used in aerospace, chemical processing, and marine applications.
Table of Contents
What is 1.3964, X2CrNiMnMoNNb21-16-5-3, S20910, XM-19?
Discover the properties of XM-19 (1.3964, X2CrNiMnMoNNb21-16-5-3, S20910) stainless steel, including chemical composition, mechanical performance, welding, and global equivalents.
Applications
- Aerospace components
- Chemical processing equipment
- Marine fasteners & valves
- Nuclear reactor parts
- High-strength structural applications
Chemical Composition (%)
| Element (%) | XM-19 (S20910) |
X2CrNiMnMoNNb21-16-5-3 (EN) |
1.3964 (DIN) |
|---|---|---|---|
| Carbon (C) | ≤0.06 | ≤0.06 | ≤0.06 |
| Chromium (Cr) | 20.5–23.5 | 20.5–23.5 | 20.5–23.5 |
| Nickel (Ni) | 11.5–13.5 | 11.5–13.5 | 11.5–13.5 |
| Manganese (Mn) | 4.0–6.0 | 4.0–6.0 | 4.0–6.0 |
| Molybdenum (Mo) | 1.5–3.0 | 1.5–3.0 | 1.5–3.0 |
| Nitrogen (N) | 0.20–0.40 | 0.20–0.40 | 0.20–0.40 |
| Niobium (Nb) | 0.10–0.30 | 0.10–0.30 | 0.10–0.30 |
| Silicon (Si) | ≤1.0 | ≤1.0 | ≤1.0 |
| Phosphorus (P) | ≤0.045 | ≤0.045 | ≤0.045 |
| Sulfur (S) | ≤0.030 | ≤0.030 | ≤0.030 |
Material Properties
| Property | XM-19 (S20910) | X2CrNiMnMoNNb21-16-5-3 | 1.3964 |
|---|---|---|---|
| Tensile Strength (MPa) | 690–895 | 690–895 | 690–895 |
| Yield Strength (0.2% Offset, MPa) | ≥415 | ≥415 | ≥415 |
| Elongation (% in 50mm) | ≥30 | ≥30 | ≥30 |
| Hardness (Rockwell B) | ≤100 HRB | ≤100 HRB | ≤100 HRB |
High-Temperature & Creep Performance
- Oxidation Resistance: Good up to 925°C (1697°F).
- Creep Strength: Superior to standard 300-series stainless steels due to nitrogen strengthening.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.9 |
| Melting Range (°C) | 1400–1450 |
| Thermal Conductivity (W/m·K at 20°C) | 15 |
| Electrical Resistivity (Ω·m) | 0.85 × 10⁻⁶ |
| Magnetic Permeability | Non-magnetic (annealed) |
Heat Treatment
- Solution Annealing: 1050–1150°C (1922–2102°F), followed by rapid cooling (water or air).
- Stress Relieving: Not typically required but can be done at 400–600°C (752–1112°F).
Processing Performance
Fabrication & Welding
- Machinability: Similar to 304/316 but harder; use carbide tools.
- Welding: Excellent weldability via TIG, MIG, or SAW. No preheating required.