440B / X90CrMoV18
1.4112High-carbon martensitic stainless steel with molybdenum and vanadium. Hardenable to 58+ HRC while maintaining moderate corrosion resistance. Used for cutlery, surgical instruments, valve components, bearings, and pump parts where hardness and corrosion resistance are both needed.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 440B | S44004 | REF |
| 🇪🇺 | EN | Europe | X90CrMoV18 | 1.4112 | 100% |
| 🇯🇵 | JIS | Japan | SUS440B | — | 88% |
Sources: ASTM A276, EN 10088-2, JIS G4303
Chemical composition comparison (wt%)
Side-by-side: 440B / X90CrMoV18 (EN) (EN 10088-2) vs SUS440B (JIS)
| Element | 440B / X90CrMoV18 (EN) | SUS440B (JIS) | Overlap |
|---|---|---|---|
| C | 0.85–0.95% | — | — |
| Si | 0–1% | — | — |
| Mn | 0–1% | — | — |
| P | 0–0.04% | — | — |
| S | 0–0.015% | — | — |
| Cr | 17–19% | — | — |
| Mo | 0.9–1.3% | — | — |
| V | 0.07–0.12% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 56–60 | HRC |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.7 | g/cm3 |
Annealed
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 285 | HB |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 1030–1060 °C | oil | 20-30 min | Preheat to 850°C first |
| tempering | 150–400 °C | air | 2x 60 min | Low temp (150-200°C) for max hardness, higher for toughness |
| annealing | 800–850 °C | furnace | 2-4 hours | Slow furnace cool |
Compatibility verdict
440B / X90CrMoV18 and SUS440B: 88% 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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