1.4542 / 17-4PH / 630 Material Specification
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what is 17-4ph stainless steel ?
1.4542 / 17-4PH / 630 refers to the same precipitation-hardening martensitic stainless steel (X5CrNiCuNb16-4), known for combining high strength, good toughness, and decent corrosion resistance, achieved via heat treatment (aging) after initial solution annealing, making it suitable for aerospace, oil & gas, and mechanical components needing high performance with minimal distortion after fabrication. Key elements include ~17% Chromium, ~4% Nickel, ~4% Copper, and Niobium/Tantalum, with mechanical properties varying significantly by heat treatment condition (e.g., H900, H1025, P960).
What is 1.4542 stainless steel equivalent to?
1.4542 stainless steel is primarily equivalent to 17-4 PH, also known as AISI 630, UNS S17400, and by its chemical name X5CrNiCuNb16-4, offering high strength, hardness, and good corrosion resistance through precipitation hardening.
| Standard System | Designation |
|---|---|
| UNS | S17400 |
| AISI/SAE | 630 |
| EN/DIN | 1.4542 |
| ISO | X5CrNiCuNb16-4 |
| JIS | SUS630 |
| AFNOR | Z7 CNU 16-04 |
chemical composition of 17-4PH stainless steel
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Carbon (C) | – | 0.07 |
| Chromium (Cr) | 15.0 | 17.5 |
| Nickel (Ni) | 3.0 | 5.0 |
| Copper (Cu) | 3.0 | 5.0 |
| Niobium (Columbium) + Tantalum (Nb+Ta) | 0.15 | 0.45 |
| Manganese (Mn) | – | 1.0 |
| Silicon (Si) | – | 1.0 |
| Phosphorus (P) | – | 0.04 |
| Sulfur (S) | – | 0.03 |
| Iron (Fe) | Balance | – |
17-4PH stainless steel Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ (0.282 lb/in³) |
| Melting Range | 1404-1440°C (2560-2625°F) |
| Modulus of Elasticity | 196 GPa (28.5 × 10⁶ psi) |
| Electrical Resistivity at 20°C | 0.80 Ω·mm²/m (31.5 μΩ·in) |
| Thermal Conductivity at 100°C | 18.3 W/m·K (10.6 BTU·in/ft²·hr·°F) |
| Coefficient of Thermal Expansion (20-100°C) | 10.8 × 10⁻⁶ /K (6.0 × 10⁻⁶ /°F) |
| Specific Heat Capacity at 20°C | 460 J/kg·K (0.11 BTU/lb·°F) |
| Magnetic Permeability | Ferromagnetic in all conditions |
17-4PH stainless steel Mechanical Properties
| Condition | Ultimate Tensile Strength, MPa (ksi) | 0.2% Yield Strength, MPa (ksi) | Elongation in 50mm (2″), % | Hardness, HBW (HRC) |
|---|---|---|---|---|
| Solution Annealed (Condition A) | 1030 (150) | 760 (110) | 8 | 330 (33) |
| H900 (aged at 482°C/900°F) | 1310-1380 (190-200) | 1170-1280 (170-185) | 10-14 | 388-444 (40-44) |
| H925 (aged at 496°C/925°F) | 1310 (190) | 1210 (175) | 14 | 388-444 (40-44) |
| H1025 (aged at 552°C/1025°F) | 1170 (170) | 1140 (165) | 15 | 331-388 (36-40) |
| H1075 (aged at 580°C/1075°F) | 1140 (165) | 1030 (150) | 16 | 321-375 (35-38) |
| H1150 (aged at 621°C/1150°F) | 1000 (145) | 860 (125) | 19 | 311 (33) |
| H1150D (double aged at 621°C/1150°F) | 965 (140) | 827 (120) | 22 | 294 (31) |
17-4 PH Machinability
In the annealed condition, 17-4 PH has good machinability, similar to that of 304 stainless steel. After hardening heat treatment, machining is difficult but possible.
Carbide or high speed steel tools are normally used with standard lubrication. When strict tolerance limits are required, the dimensional changes due to heat treatment must be taken into account
17-4PH stainless steel Heat Treatment (Aging)
Solution Annealing (Condition A): Soft, machinable state (e.g., heat at 1040°C, air cool).
Aging (H-Conditions): Low-temperature heat treatment to harden; H900, H1025, H1150 are common, with higher numbers generally yielding lower strength but better ductility.
What is 17-4 PH stainless steel used for?
Due to the high strength of precipitation hardening stainless steels, most applications are in aerospace and other high-technology industries.
Applications include:
~ Gears
~ Valves and other engine components
~ High strength shafts
~ Turbine blades
~ Moulding dies
~ Nuclear waste casks
If you have project requirements for 1.4542 17-4ph 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.
17-4PH stainless steel Plate and Sheet
| Product Form | Thickness | Width | Length |
|---|---|---|---|
| Plate | 4.0 mm – 100 mm (0.157″ – 4″) | Up to 2,500 mm (98″) | Up to 10,000 mm (394″) |
| Sheet | 0.5 mm – 4.0 mm (0.020″ – 0.157″) | Up to 1,500 mm (59″) | Up to 6,000 mm (236″) |
| Strip | 0.1 mm – 3.0 mm (0.004″ – 0.118″) | Up to 500 mm (20″) | Coil form or cut lengths |
17-4PH stainless steel Bar and Rod
| Product Form | Diameter/Dimension | Length |
|---|---|---|
| Round Bar | 5 mm – 300 mm (0.197″ – 12″) | Up to 6,000 mm (236″) |
| Square Bar | 10 mm – 150 mm (0.394″ – 6″) | Up to 6,000 mm (236″) |
| Flat Bar | Thickness: 5 mm – 50 mm (0.197″ – 2″) Width: 10 mm – 200 mm (0.394″ – 8″) |
Up to 6,000 mm (236″) |
| Hexagonal Bar | 10 mm – 100 mm (0.394″ – 4″) across flats | Up to 6,000 mm (236″) |
| Wire | 0.5 mm – 12 mm (0.020″ – 0.472″) | Coil form or cut lengths |
17-4PH stainless steel Tube and Pipe
| Product Form | Outside Diameter | Wall Thickness | Length |
|---|---|---|---|
| Seamless Tube | 6 mm – 150 mm (0.236″ – 6″) | 0.5 mm – 10 mm (0.020″ – 0.394″) | Up to 12,000 mm (472″) |
| Welded Tube | 10 mm – 300 mm (0.394″ – 12″) | 0.5 mm – 10 mm (0.020″ – 0.394″) | Up to 12,000 mm (472″) |
All of the above products come with product quality inspection certificates. If you need them, please contact us!Email: info@gneestainless.com
