AISI 17-4PH Precipitation Hardening Edelstahl — Properties, Heat Treatment & Equivalents
ASTM A564 Grade 630 (UNS S17400) · Published: 2026-06-14 · Updated: July 2026
17-4PH is the most widely used precipitation hardening stainless steel, combining high strength (comparable to many alloy steels), excellent corrosion resistance (approaching 304 in many environments), and good fabrication characteristics. Its...
17-4PH ist der meiste widely used precipitation hardening stainless steel, combining hoch strength (comparable zu viele alloy steels), excellent corrosion widerstand (approaching 304 in viele environments), und gut fabrication characteristics. Sein unique combination von properties comes von ein martensitic matrix strengthened durch copper-rich precipitates formed während aging.
Der H900 condition (aged bei 480°C/900°F) delivers der highest strength — approximately 1,240 MPa yield — but mit reduced toughness und increased susceptibility zu stress corrosion cracking in chloride environments. Der H1150 condition (aged bei 620°C/1150°F) sacrifices approximately 25% von der peak strength but dramatically improves toughness, ductility, und stress corrosion cracking widerstand. Meiste aerospace applications specify H1025 oder H1075 als ein balanced compromise.
Key applications: aerospace structural components, pumpe shafts, ventil stems, marine propeller shafts, nuclear waste containers, und food processing ausrüstung wo beide strength und corrosion widerstand sind erforderlich. Nicht recommended für service über 315°C (600°F) — der copper precipitates coarsen und strength drops rapidly.
Quick Facts
| Kategorie | Edelstahl |
| Norm | ASTM A564 Grade 630 (UNS S17400) |
| Density | 7750 |
| Yield Strength | 1,100-1,240 MPa (H900 to H1150 conditions) |
| Tensile Strength | 1,310-1,380 MPa |
Global Equivalents & Cross-Reference
| Alternative Norm / Güte | Action |
|---|---|
| EN 1.4542 | Compare |
| X5CrNiCuNb16-4 | Compare |
| JIS SUS630 | Compare |
| GB 0Cr17Ni4Cu4Nb | Compare |
Verwandt Materials
🧮 Material Weight Calculator
Calculate the weight based on this material's density: 7750
Frequently Asked Questions
17-4PH vs 15-5PH — was's der difference?
15-5PH (UNS S15500) ist ein variant mit ein modified composition das improves transverse toughness — der Cr und Ni sind adjusted zu eliminate delta ferrite stringers das reduce toughness in der kurz-transverse direction. Für applications wo der material werden sein stressed in multiple directions (e.g., fittings, forgings mit complex geometry), 15-5PH ist preferred. Für simpler geometries loaded primarily in der longitudinal direction, 17-4PH performs equivalently bei unter kosten.
Können 17-4PH sein used in contact mit salt wasser?
Es depends ein der aging condition und der spezifisch environment. In der H1150 condition, 17-4PH hat gut widerstand zu marine atmospheric corrosion. However, es ist susceptible zu pitting und crevice corrosion in stagnant seawater und zu stress corrosion cracking in warm chloride environments — particularly in der higher-strength H900 condition. Für kritisch marine fasteners, consider Nitronic 50 (UNS S20910) oder ein duplex stainless steel instead.
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu