X3CrNiMo13-4
1.4313Low-carbon martensitic stainless steel with nickel (3.5–4.5%) and molybdenum (0.3–0.7%) for improved toughness, weldability, and corrosion resistance. Available in QT650, QT780, and QT900 conditions. Primary material for hydraulic turbine runners (Francis, Kaplan), pump impellers, compressor components, and offshore parts. Service range -60°C to 300°C. Also known as F6NM (ASTM cast) and UNS S41500.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | S41500 | S41500 | REF |
| 🇺🇸 | ASTM | USA | F6NM (cast) | — | 95% |
| 🇫🇷 | AFNOR | France | Z6CN13-04 | — | 95% |
Sources: ASTM A182, ASTM A743, NF EN 10088
Chemical composition comparison (wt%)
Side-by-side: X3CrNiMo13-4 (EN) (EN 10088-2:2005) vs F6NM (cast) (ASTM)
| Element | X3CrNiMo13-4 (EN) | F6NM (cast) (ASTM) | Overlap |
|---|---|---|---|
| C | ≤ 0.05% | — | — |
| Si | ≤ 0.7% | — | — |
| Mn | ≤ 1.5% | — | — |
| P | ≤ 0.04% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 12–14% | — | — |
| Mo | 0.3–0.7% | — | — |
| Ni | 3.5–4.5% | — | — |
| N | ≤ 0.02% | — | — |
Mechanical properties
QT780
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 780–980 | MPa |
| Yield Strength | ≥ 620 | MPa |
| Elongation | ≥ 15 | % |
| impact_kv | ≥ 40 | J |
| Hardness HB | 230–300 | HB |
| Density | ≥ 7.7 | g/cm3 |
| Elastic Modulus | ≥ 215 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 950–1050 °C | air | — | Air or oil quench |
| tempering | 550–700 °C | air | — | QT650: 650-700°C, QT780: 550-600°C, QT900: 520-580°C. Double temper recommended. |
| annealing | 600–650 °C | furnace | — | Soft annealing ≤320 HB, do not exceed 825°C |
Compatibility verdict
X3CrNiMo13-4 and F6NM (cast): 95% 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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