Hot Rolled Bright Surface 17-4PH Stainless Steel Bar with OD 6-300mm for High Strength Applications
17-4 Precipitation Hardening (Type 630) is a chromium-copper precipitation hardening stainless steel designed for applications requiring high strength and moderate corrosion resistance. This alloy maintains high strength up to approximately 600°F (316°C).
Alloy 17-4 PH is a precipitation hardening martensitic stainless steel with copper and niobium additions. This grade combines high strength, hardness (up to 572°F / 300°C), and excellent corrosion resistance.
Mechanical properties can be optimized through heat treatment, achieving very high yield strength up to 1100-1300 MPa (160-190 ksi). The grade should not be used above 572°F (300°C) or at very low temperatures.
- Offshore applications (foils, helicopter deck platforms)
- Food processing industry
- Pulp and paper industry
- Aerospace components (turbine blades)
- Mechanical components
- Nuclear waste casks
- ASTM A693 grade 630 (AMS 5604B) UNS S17400
- EURONORM 1.4542 X5CrNiCuNb 16-4
- AFNOR Z5 CNU 17-4PH
- DIN 1.4542
| Element | Content (%) |
|---|---|
| C | 0.07 max |
| Mn | 1.0 max |
| Si | 1.0 max |
| P | 0.04 max |
| S | 0.030 max |
| Cr | 15.0 - 17.5 |
| Ni | 3.0 - 5.0 |
| Cu | 3.0 - 5.0 |
| Nb+Ta | 0.15 - 0.45 |
| Condition | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell C |
|---|---|---|---|---|
| Solution Treated | 1105 typ | 1000 typ | 15 typ | 38 max |
| Condition 900 | 1310 min | 1170 min | 10 min | 40 min |
| Condition 1150 | 930 min | 724 min | 16 min | 28 min |
| Property | Value |
|---|---|
| Density | 7750 kg/m³ |
| Thermal Expansion (0-100°C) | 10.8 µm/m/°C |
| Thermal Conductivity (100°C) | 18.4 W/m·K |
| Specific Heat (0-100°C) | 460 J/kg·K |
| Electrical Resistivity | 800 nΩ·m |
Alloy 17-4 PH provides superior corrosion resistance compared to standard hardenable stainless steels and is comparable to Alloy 304 in most media. For applications with stress corrosion cracking risks, aging temperatures above 1022°F (550°C) are recommended.
The alloy demonstrates excellent resistance in chemical, petroleum, paper, dairy, and food processing industries, equivalent to 304L grade performance.
Solution Treatment (Condition A): Heat to 1040°C for 0.5 hours, then air-cool to 30°C. Small sections may be oil quenched.
Age Hardening: Performed at low temperatures to achieve required mechanical properties with minimal distortion (0.10% shrinkage for H1150, 0.05% for H900).
| Condition | Hardening Temp (°C) | Time (h) | Typical Hardness (HRC) | Tensile Strength (MPa) |
|---|---|---|---|---|
| A | Ann | - | 36 | 1100 |
| H900 | 482 | 1 | 44 | - |
| H925 | 496 | 4 | 42 | 1170-1320 |
| H1025 | 552 | 4 | 38 | 1070-1220 |
| H1075 | 580 | 4 | 36 | 1000-1150 |
| H1100 | 593 | 4 | 35 | 970-1120 |
| H1150 | 621 | 4 | 33 | 930-1080 |
| Alternative Grade | Selection Considerations |
|---|---|
| 431 | Higher toughness than 17-4PH, better availability in some sizes |
| 416 | Free-machining martensitic stainless steel, better for repetition machining, lower cost |
| 316 | Higher corrosion resistance for severe environments, but with much lower strength |
| 2205 | Much better corrosion resistance with lower strength (not as low as 316) |
Welding: Grade 630 can be welded using all conventional methods without pre-heating requirements.
Machining: Best performed in solution-treated condition with machining rates similar to grade 304 stainless steel.
- Engine components
- High-strength boat propeller shafts
- Plastic molding dies
- Valves and gears
- Aerospace turbine blades
- Nuclear waste containment
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