625
High-Temp Steel625
Ni-Cr-Mo-Nb alloy, corrosion & high-temp resistant. (ASTM B637; equiv UNS N06625 / AMS 5666 / EN 2.4856 / GB 0Cr20Ni65Mo10Nb4). Nominal values—confirm mill certificate.
Chemical Composition (%)
| NI | 58 |
|---|---|
| CR | 20 |
| MO | 8 |
| NB+TA | 3.15 |
| FE | 5 |
| C | 0.1 |
| MN | 0.5 |
| SI | 0.5 |
| AL | 0.4 |
| TI | 0.4 |
| P | 0.015 |
| S | 0.015 |
Mechanical Properties
Tensile:≥830 MPa;Yield:≥415 MPa;Elong:≥30%;Hardness:≤240 HB
Chinese Standard
ASTM B637 625
Equivalent Standards
AMS 5666
Equivalent Grades
Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.
Applications
镍铬钼铌，耐蚀耐高温。,"Bar
Available Forms
Plate
Uses
Wire"
Heat Treatment
Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.
Precautions
Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.
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