Project Description
Introduction
1.4542 (X5CrNiCuNb16-4, AISI 630, 17-4 PH, UNS S17400) is a copper-bearing precipitation hardening stainless steel. With 15–17% Cr, 3–5% Ni, and 3–5% Cu, it achieves exceptional strength levels after aging treatment while retaining good corrosion resistance and toughness. It is a primary material in the aerospace, oil & gas, chemical processing, medical, and nuclear industries.
Precipitation Hardening Bar
Similar Grades & Standards
| Standard | Designation | Document(s) |
|---|---|---|
| AISI / UNS | 630 / 17-4 PH / S17400 | — |
| ASTM | Grade 630 | A564, A693, A705 |
| AMS | — | AMS 5604, 5622, 5643, 5825 |
| EN | X5CrNiCuNb16-4 / 1.4542 | EN 10088-1, EN 10088-3 |
| DIN | X5CrNiCuNb17-4 / 1.4542 | DIN 17440 |
| JIS | SUS630 | JIS G4303 |
| BS | 17/4 PH | BS 7252-4 |
| ISO | X5CrNiCuNb16-4 | ISO 683-17 |
Applications
| Industry | Typical Parts & Components |
|---|---|
| Aerospace | Aircraft frames, wing fittings, gears, shafts, bulkhead fasteners, helicopter rotor heads |
| Oil & Gas | Pump shafts, valve bodies, valve stems, wellhead components, subsea connectors |
| Chemical Processing | Pump impellers, agitator shafts, centrifuge drums, pressure vessel nozzles |
| Medical & Dental | Orthopedic implants, surgical drill sleeves, dental instrument bodies |
| Nuclear | Reactor vessel bolts, control rod drive mechanisms, fuel assembly springs |
| Semiconductor & Electronics | CMP retaining rings, vacuum chamber parts, precision instrument housings |
| Marine & Defence | Naval deck fittings, torpedo components, gun parts, anchor chain links |
Supply Forms & Sizes
| Form | Typical Size Range | Common Condition |
|---|---|---|
| Round Bar | Ø 6 – 800 mm | Cond. A, H900–H1150 |
| Flat Bar | T 3–100 mm × W 10–300 mm | Cond. A, Annealed |
| Sheet / Plate | T 0.5–50 mm, W up to 2000 mm | Cond. A, 2B, BA |
| Seamless Tube / Pipe | OD 10 – 200 mm | Cond. A, Annealed |
| Wire | Ø 0.10 – 16 mm | Cond. A, Cold-drawn |
| Forgings / Rings | Per order | Cond. A + aged |
Chemical Composition
Per EN 10088-3 — cast analysis (mass %)
| C max | Si max | Mn max | P max | S max | Cr | Ni | Cu | Nb |
|---|---|---|---|---|---|---|---|---|
| 0.07 | 0.70 | 1.50 | 0.040 | 0.015 | 15.0–17.0 | 3.0–5.0 | 3.0–5.0 | 0.15–0.45 |
Mechanical Properties
Per ASTM A564 / A693 (bar & plate); aging designations per common AMS / ASTM practice
| Condition | Aging Temp. | Rm (MPa) | Rp0.2 (MPa) | A (%) | Hardness |
|---|---|---|---|---|---|
| Cond. A (solution) | — | ≥ 1000 | ≥ 793 | ≥ 8 | ≤ 38 HRC |
| H900 | 482 °C / 1 h | ≥ 1310 | ≥ 1170 | ≥ 10 | ≥ 375 HB / ~40 HRC |
| H1025 | 552 °C / 4 h | ≥ 1170 | ≥ 1000 | ≥ 12 | 331–363 HB / ~35 HRC |
| H1075 | 579 °C / 4 h | ≥ 1070 | ≥ 1000 | ≥ 13 | 311–352 HB / ~33 HRC |
| H1150 | 621 °C / 4 h | ≥ 862 | ≥ 655 | ≥ 16 | 277–352 HB / ~28 HRC |
Solution treatment: 1020–1060 °C, air cool to below 32 °C. H900 delivers peak strength; H1150 offers best toughness and corrosion resistance. Service temperature limit approx. 315 °C (H900) to 370 °C (H1150).