Views: 16 Author: Shirley Publish Time: 2025-07-14 Origin: Site
17-4PH is a martensitic precipitation hardening stainless steel with high strength, high hardness, good welding performance and corrosion resistance. It is commonly used in strong parts that need some resistance to corrosion. This includes areas like aerospace, petrochemical, and marine engineering.
Our factory supplies 17-4PH material in different forms. We offer 17-4PH bars, plates, seamless pipes, fittings (socket weld/threaded), and flanges. All products meet ASTM A564/A693, AMS 5604, and similar global standards.
17-4PH processing characteristics:
Hot processing: Easy to forge, complete hot processing includes solution annealing, cooling and ripening.
Cold processing can only be done on plates that are soft. The conditions for this process are quite strict.
Easy to process: If you need higher hardness and strength, you can use aging treatment. If you want better ductility and plasticity, you can use solution treatment.
17-4PH advantages:
High Strength-to-Weight Ratio: Achieves tensile strength up to 1,310 MPa in H900 condition, surpassing many carbon steels.
High strength:
After processing and heat treatment, 17-4PH (UNS S17400) is much stronger than traditional austenitic stainless steels. It is 2-3 times stronger than steels like 304 and 316L.
Corrosion resistance: 17-4PH has good corrosion resistance in various corrosive media, especially for chlorides, sulfides and acidic media. It also has some resistance to stress corrosion. It is good for use in high temperature and high pressure environments. In a mildly corrosive environment, its stress corrosion cracking resistance is equivalent to 304 H1150 steel.
Heat treatability: Through a reasonable heat treatment process, 17-4PH can obtain good mechanical properties and corrosion resistance. Common heat treatment methods include solution treatment and aging treatment.
Weldability: 17-4PH welds very well. It can be joined using standard welding methods for various projects.
17-4 ph Chemical Composition
The 17-4PH chemical composition mainly includes Cr, Ni, Cu, Nb, Si, P, S and others.
| Grades | 0Cr17Ni4Cu4Nb | 630 | 17-4ph | 1.4542 |
| C | ≤0.07 | ≤0.07 | ≤0.07 | ≤0.07 |
| Si | ≤1.00 | ≤1.00 | ≤1.00 | ≤0.70 |
| Mn | ≤1.00 | ≤1.00 | ≤1.00 | ≤1.50 |
| P | ≤0.035 | ≤0.040 | ≤0.040 | ≤0.040 |
| S | ≤0.030 | ≤0.030 | ≤0.030 | ≤0.015 |
| Cr | 15.5-17.5 | 15-17 | 15-17 | 15-17 |
| Ni | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 |
| Cu | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 | 3.0-5.0 |
| Nb | 0.15-0.45 | 0.15-0.45 | 0.15-0.45 | ≤0.45 |
| Mo | - | - | - | ≤0.6 |
17-4 ph Physical Properties
| Properties | Value |
| Density | 7.80 g/cm³ |
| Melting Point | 1400-1440°C |
| Magnetic Response | Magnetic (Martensitic) |
| Thermal Conductivity | 18.4 W/m·K (at 100°C) |
17-4 ph Mechanical Properties
17-4PH UNS S17400 has high strength and corrosion resistance. Common mechanical properties include tensile strength, yield strength, elongation, impact toughness, etc. These properties parameters can be adjusted according to specific requirements:
| Condition | Annealed | H900 | H1150 |
| 0.2% YS (MPa) | 725 | 1170 | 1000 |
| UTS (MPa) | 1000 | 1310 | 1070 |
| Hardness (HRC) | 28 | 44 | 33 |
| Elong. (%) | 15 | 10 | 12 |
| Charpy Impact (J) | 55 | 18 | 40 |
Standard | USA (UNS/ASTM) | Europe (EN) | UK (BS) | Germany (DIN/WNr) | Russia (GOST) | Japan (JIS) |
Designation | S17400 / A564 | 1.4542 / X5CrNiCuNb16-4 | 17-4PH | X5CrNiCuNb16-4 / 1.4542 | 09Ch16N4Yu | SUS 630 |
Aerospace
17 4PH is strong and lightweight. It is often used in aerospace. This includes parts for aircraft, satellite components, engines, and other important parts.
Marine Engineering
Because it resists seawater corrosion well, 17 4PH is often used in marine engineering. This includes offshore oil platforms and wind power equipment.
Petrochemicals
17 4PH can keep strong mechanical properties in high temperature, high pressure, and corrosive environments. Because of this, it is widely used in pipelines, valves, pressure vessels, and other equipment in the petrochemical field.
Medical Devices
Because it is biocompatible, 17 4PH can be used to make medical devices. This includes artificial joints and surgical tools.
17-4PH is the mark precipitation-hardening alloy where calibrated strength, corrosion resistance, and reliability are non-negotiable. We are a manufacturer with IATF 16949 certification. We ensure precise metallurgy in all our products. Our team provides helpful technical support and quick logistics.
