X4CrNiMo16-5-1
1.4418Supermartensitic stainless steel with high Ni and Mo. Excellent combination of high strength (up to 1000 MPa) and good corrosion resistance. Superior to CA6NM (1.4313). Used for offshore flow lines, subsea Christmas trees, hydraulic cylinders, and pump shafts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS S41800 (approx) | — | REF |
| 🇪🇺 | EN | Europe | X4CrNiMo16-5-1 | 1.4418 | 100% |
Sources: ASTM A240, EN 10088-3
Chemical composition comparison (wt%)
Side-by-side: X4CrNiMo16-5-1 (EN) (EN 10088-3) vs X4CrNiMo16-5-1 (EN) (EN 10088-3)
| Element | X4CrNiMo16-5-1 (EN) | X4CrNiMo16-5-1 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.06% | 0–0.06% | OK |
| Si | 0–0.7% | 0–0.7% | OK |
| Mn | 0–1.5% | 0–1.5% | OK |
| P | 0–0.04% | 0–0.04% | OK |
| S | 0–0.015% | 0–0.015% | OK |
| Cr | 15–17% | 15–17% | OK |
| Mo | 0.8–1.5% | 0.8–1.5% | OK |
| Ni | 4–6% | 4–6% | OK |
Mechanical properties
QT900
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 900–1100 | MPa |
| Yield Strength | ≥ 700 | MPa |
| Elongation | ≥ 12 | % |
| Elastic Modulus | ≥ 215 | GPa |
| Density | ≥ 7.7 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 950–1020 °C | air | 30-60 min | Air hardening |
| tempering | 580–630 °C | air | min 2 hours | Double temper recommended for NACE compliance |
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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