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Views: 10 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 widely used in high-strength parts with certain corrosion resistance requirements, such as aerospace, petrochemical and marine engineering. Our factory supplies 17-4PH material product forms: 17-4ph bars, plates, seamless pipes, fittings (socket weld/threaded), and flanges – all manufactured to ASTM A564/A693, AMS 5604, and equivalent global standards.
17-4PH processing characteristics:
Hot processing: Easy to forge, complete hot processing includes solution annealing, cooling and ripening.
Cold processing: Cold processing can only be performed on plates in a soft temper, and the conditions are relatively strict.
Easy to process: If higher hardness and strength are required, aging treatment can be performed; if better ductility and plasticity are required, solution treatment can be performed.
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, the strength of 17-4PH (UNS S17400) is 2-3 times higher than traditional austenitic stainless steels such as 304, 316L, etc.
Corrosion resistance: 17-4PH has good corrosion resistance in various corrosive media, especially for chlorides, sulfides and acidic media. At the same time, it also has certain stress corrosion resistance and is suitable 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 has excellent welding performance and can be welded by conventional welding methods to meet the needs of different 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 has high strength and lightweight characteristics and is widely used in the aerospace field, including aircraft parts, satellite components and engines and other key components.
Marine Engineering
Due to its excellent resistance to seawater corrosion, 17 4PH can be widely used in marine engineering projects, such as offshore oil platforms, offshore wind power generation equipment, etc.
Petrochemicals
17 4PH can maintain good mechanical properties in high temperature, high pressure and highly corrosive media environments, so it is widely used in pipelines, valves, pressure vessels and other equipment in the petrochemical field.
Medical Devices
Due to its good biocompatibility, 17 4PH can be used to manufacture medical devices such as artificial joints and surgical instruments.
17-4PH is the mark precipitation-hardening alloy where calibrated strength, corrosion resistance, and reliability are non-negotiable. As a vertically integrated manufacturer with IATF 16949 certification, we guarantee metallurgical precision across all product forms – backed by actionable technical support and agile logistics.
