1.4542 stainless steel: Mechanical properties , Applications
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What is 1.4542 stainless steel?
EN 1.4542 (X5CrNiCuNb16-4) is the European standard grade for 17-4PH stainless steel (UNS S17400). It belongs to the martensitic precipitation-hardening stainless steel series, strengthened by the precipitation of copper during the aging process. Unlike traditional austenitic stainless steels, 1.4542 achieves its excellent properties through controlled heat treatment, allowing for adjustable strength and hardness as needed without sacrificing corrosion resistance. It can be processed into various practical product forms, including plates, coils, tubes, bars, and wires.
What is 1.4542 stainless steel equivalent to?
1.4542 stainless steel (also known as X5CrNiCuNb16-4) is a precipitation-hardening stainless steel, equivalent to 17-4 PH, AISI 630, and UNS S17400 grades. It possesses high strength, high hardness, and good corrosion resistance, and is commonly used in industries such as aerospace, medical, and petrochemicals.
| AISI 630 | ASTM A693 (630) | AMS 5342 | MIL-S-81506 |
| AMS 5604 | ASTM A705 (630) | AMS 5343 | SAE J467 (17-4PH) |
| AMS 5622 | MIL C-24111 | AMS 5344 | ASME SA705 |
| AMS 5643 | MIL P-47183 | AMS 5355 | ASME SA564 |
| ASTM A564 (630) | MIL S-81591 | AMS 5825 |
Chemical Composition of 1.4542 Stainless Steel
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 15.0 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Niobium + Tantalum (Nb+Ta) | 0.15 – 0.45 |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
Mechanical Properties of 1.4542 Stainless Steel
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Hardness |
|---|---|---|---|
| Solution Annealed | ≥ 930 | ≥ 725 | ≤ 35 HRC |
| H900 | ≥ 1310 | ≥ 1170 | 40–44 HRC |
| H1025 | ≥ 1070 | ≥ 1000 | 35–38 HRC |
| H1150 | ≥ 860 | ≥ 725 | 28–32 HRC |
Applications of 1.4542 Stainless Steel
1.4542 stainless steel is widely used where strength, precision, and reliability are critical:
Aerospace fittings and structural components
Oil & gas valve parts and pump shafts
Power generation and turbine components
High-load mechanical fasteners
Precision CNC-machined parts
Defense and nuclear-related equipment
Is 1.4542 stainless steel stronger than 316?
Yes, 1.4542 (17‑4PH) is significantly stronger than 316 in the peak-aged condition: 1.4542 can achieve tensile strength ≥ 1310 MPa and yield strength ≥ 1170 MPa (H900 temper), whereas 316/316L typically has tensile strength 515–620 MPa and yield strength ≥ 205 MPa, due to its precipitation-hardening martensitic structure.
Can 1.4542 stainless steel be welded?
Yes, 1.4542 can be welded using TIG, MIG, and resistance methods, but precipitation heat treatment should be done after welding to restore strength; if welded in the aged condition, avoid overheating to prevent loss of mechanical properties.
What heat treatment is best for 1.4542 stainless steel?
The optimal heat treatment is solution annealing at 1040–1065 °C followed by rapid cooling (water quench) and aging at 480–620 °C (commonly 482 °C for H900 temper) to develop the highest strength and hardness (up to 38 HRC).
Is 1.4542 stainless steel corrosion resistant?
1.4542 offers good general corrosion resistance in mildly acidic and chloride-containing environments, but its PREN ≈ 20–22 is lower than 316 (PREN ≈ 24–26), making it less resistant to pitting and crevice corrosion in aggressive chloride media; it is not recommended for prolonged exposure to seawater or strong acids.
1.4542 stainless steel supplier-GNEE
If you have project requirements for 1.4542 stainless steel bars, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
Available Product Forms of 1.4542 Stainless Steel
| Product Type | Common Supply |
|---|---|
| Round / Hex / Square Bars | Hot rolled, cold drawn, peeled |
| Plates & Sheets | Solution annealed |
| Forgings | Custom shapes |
| Machined Components | Heat-treated as required |
| Standards | EN 10088, ASTM A564, AMS 5643 |
