17-4PH (UNS S17400) is a martensitic precipitation-hardening stainless strengthened by copper. Machined in the solution-annealed state and given a single low-temperature age (H900–H1150), it reaches 930–1310 MPa tensile and HRC 30–45, balancing strength with corrosion resistance.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Stainless Steel 17-4PH as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), forgings & rolled rings (up to 7500 kg, 3500 mm OD), machined parts to your drawings — all with EN 10204 3.1 certified material test reports.
Stainless Steel 17-4PH Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Fe (铁) | Balance | Nb+Ta (铌+钽) | 0.15–0.45 |
| Cr (铬) | 15.0–17.5 | Mn (锰) | ≤ 1.00 |
| Ni (镍) | 3.00–5.00 | Si (硅) | ≤ 1.00 |
| Cu (铜) | 3.00–5.00 | C (碳) | ≤ 0.070 |
Stainless Steel 17-4PH Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 1310 MPa（H900） |
| Yield strength (Rp0.2) | ≥ 1170 MPa（H900） |
| Elongation (A) | ≥ 10 % |
| Hardness | ≥ 40 HRC |
| Density | 7.80 g/cm³ |
| Melting range | 1404–1440 °C |
| Thermal conductivity | 17.9 W/m·K |
| Young's modulus | 196 GPa |
| Max service temperature | 300 °C (caution above H900) |
Key Advantages
- Aged tensile up to 1310 MPa with hardness above HRC 40
- Simple heat treatment — a single low-temperature age with minimal distortion
- Corrosion resistance close to 304
- Ageing temperature tunes the strength/toughness balance
Relevant Standards
- ASTM A564
- ASTM A693
- AMS 5604
- UNS S17400
Typical Applications
- Aerospace structures and engine parts
- Valves, pump shafts and fasteners
- Oilfield machinery and downhole tools
- Moulds and extruder screws
- Medical and surgical instruments
Why Buy from Hangbo Alloy?
- Factory-direct manufacturer — founded 2012, headquartered in Shanghai Qingpu
- Full product range — bar, plate, sheet, strip, tube, forging, welding wire, flanges and machined parts
- Certified quality — ISO 9001:2015, GB/T 19001-2016, GJB 9001C-2017, EN 10204 3.1 mill test certificates with third-party inspection (SGS / BV / TUV) available on request
- Complete mill documentation — chemical analysis, mechanical test, ultrasonic test (UT), hardness and grain-size reports with every shipment
Contact Us — Shanghai Hangbo Alloy Group Co., Ltd.
Shanghai Hangbo Alloy Group Co., Ltd.
📍 No. 388 Songhuang Road, Qingpu District, Shanghai, China
📞 Tel / WhatsApp: +86 15618279078
✉️ Email: demi@nickel-alloy.com
🕒 Available 24 hours a day, 7 days a week — enquiries answered around the clock.
Send your drawing or enquiry (grade, form, size, quantity, standard) for a same-day quotation.
Frequently asked questions
Should I choose 17-4PH in H900 or H1150 condition?
H900 (482 °C for 1 h) gives maximum strength (tensile ≥ 1310 MPa, HRC 40+) but the lowest toughness and higher stress-corrosion susceptibility. H1150 (621 °C for 4 h) is weaker (about 1000 MPa tensile, HRC 31) but has the best toughness and SCC resistance. In chloride or sulphide service prefer H1100 or H1150.
What forms and sizes are available?
We supply Stainless Steel 17-4PH as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), forgings & rolled rings (up to 7500 kg, 3500 mm OD), machined parts to your drawings. Custom lengths, tolerances and machining to drawing are available on request.
What is the MOQ and lead time?
MOQ is flexible — trial orders from a single piece are welcome. Stock sizes ship in 3–7 days; custom forgings and machined parts typically 15–35 days depending on quantity and process.
Can you provide third-party inspection and shipping to my port?
Yes. SGS / BV / TUV or your nominated inspector can witness all tests before shipment. Full export documentation is provided, and we ship worldwide by sea or air on FOB, CIF or DDP terms.