17-4PH
1.4542The most widely used precipitation-hardening stainless steel. Combines high strength (up to 1310 MPa UTS) with corrosion resistance comparable to 304. Delivered solution-annealed and hardened by simple low-temperature aging. Used in aerospace, medical, oil & gas, and nuclear applications.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 630 | S17400 | REF |
| 🇪🇺 | EN | Europe | X5CrNiCuNb16-4 | 1.4542 | 100% |
| 🇯🇵 | JIS | Japan | SUS630 | — | 98% |
| 🇫🇷 | AFNOR | France | Z6CNU17.04 | — | 97% |
| 🇨🇳 | GB | China | 05Cr17Ni4Cu4Nb | — | 95% |
Sources: ASTM A564, EN 10088-3, JIS G4303, NF EN 10088-3, GB/T 1220
Chemical composition comparison (wt%)
Side-by-side: 17-4PH (EN) (EN 10088-3) vs SUS630 (JIS)
| Element | 17-4PH (EN) | SUS630 (JIS) | Overlap |
|---|---|---|---|
| C | 0–0.07% | — | — |
| Si | 0–0.7% | — | — |
| Mn | 0–1.5% | — | — |
| P | 0–0.04% | — | — |
| S | 0–0.03% | — | — |
| Cr | 15–17% | — | — |
| Ni | 3–5% | — | — |
| Cu | 3–5% | — | — |
| Nb | 0.15–0.45% | — | — |
Mechanical properties
H900
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 1310 | MPa |
| Yield Strength | ≥ 1170 | MPa |
| Elongation | ≥ 10 | % |
| Hardness HRC | 40–48 | HRC |
H1025
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 1070 | MPa |
| Yield Strength | ≥ 1000 | MPa |
| Hardness HRC | 33–39 | HRC |
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 363 | HB |
| Elastic Modulus | ≥ 196 | GPa |
| Density | ≥ 7.78 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1030–1050 °C | air | 30 min minimum | Condition A: Cool to below 16°C for full martensite transformation |
| aging_H900 | 480–480 °C | air | 1 hour | H900: Highest strength, 40-48 HRC |
| aging_H1025 | 550–550 °C | air | 4 hours | H1025: Best balance of strength and toughness, 33-39 HRC |
| aging_H1150 | 620–620 °C | air | 4 hours | H1150: Maximum toughness, 28-33 HRC |
Compatibility verdict
17-4PH and SUS630: 98% 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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