X17CrNi16-2
1.4057Martensitic CrNi stainless — AISI 431. Best corrosion resistance of ALL martensitic stainless steels due to high Cr (15-17%) + Ni (1.5-2.5%). Hardenable to HRC 46-50. Used for shafts, bolts, valve stems, pump components, fasteners in marine/offshore environments. Also aerospace (WL4044) and medical instruments. Service to 400°C.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 431 / UNS S43100 | S43100 | REF |
| 🇪🇺 | EN | Europe | X17CrNi16-2 / 1.4057 | 1.4057 | 100% |
Sources: ASTM A276, EN 10088-3
Chemical composition comparison (wt%)
Side-by-side: X17CrNi16-2 (EN) (EN 10088-3) vs X17CrNi16-2 / 1.4057 (EN) (EN 10088-3)
| Element | X17CrNi16-2 (EN) | X17CrNi16-2 / 1.4057 (EN) | Overlap |
|---|---|---|---|
| C | 0.12–0.22% | 0.12–0.22% | OK |
| Si | 0–1% | 0–1% | OK |
| Mn | 0–1.5% | 0–1.5% | OK |
| Cr | 15–17% | 15–17% | OK |
| Ni | 1.5–2.5% | 1.5–2.5% | OK |
Mechanical properties
QT800
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 800–950 | MPa |
| Yield Strength | ≥ 600 | MPa |
| Elongation | ≥ 14 | % |
| Hardness HRC | 46–50 | HRC |
| Elastic Modulus | ≥ 215 | GPa |
| Density | ≥ 7.7 | g/cm3 |
Compatibility verdict
X17CrNi16-2 and X17CrNi16-2 / 1.4057: 100% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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