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Home > Stainless Steel > Stainless Steel Garde > 17-4 PH (630) Stainless Steel
17-4 PH (630) Stainless Steel, also known as AISI 630, is a martensitic precipitation-hardening alloy known for excellent corrosion resistance, high strength, and durability across various conditions. It contains approximately 17% chromium, 4% nickel, and added copper for improved strength after heat treatment. This alloy can achieve remarkable hardness and strength with low-temperature aging, making it ideal for applications requiring minimal distortion and high reliability.
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| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 15.00 – 17.50 |
| Nickel (Ni) | 3.00 – 5.00 |
| Copper (Cu) | 3.00 – 5.00 |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Niobium (Nb) | 0.15 – 0.45 |
| Iron (Fe) | Balance |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.75 g/cm³ | 0.280 lb/in³ |
| Thermal Expansion | 10.8 x10⁻⁶/K | 6 x 10⁻⁶/°F |
| Modulus of Elasticity | 196 GPa | 28.5 x 10⁶ psi |
| Thermal Conductivity | 18.4 W/m·K | 10.6 BTU/hr·ft·°F |
| Electrical Resistivity | 0.8 µΩ·m | 31.5 µΩ·in |
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (Rockwell C) |
|---|---|---|---|---|
| Solution Annealed (Cond. A) | 1050 | 725 | 15 | 38 max |
| H900 | 1310 min | 1170 min | 10 min | 40 min |
| H1025 | 1060 min | 960 min | 12 min | 34-42 |
| H1075 | 1000 min | 860 min | 13 min | 31-38 |
| H1150 | 930 min | 725 min | 16 min | 28-35 |
| Property | Metric | Imperial |
|---|---|---|
| Thermal Conductivity (at 100°C) | 18.4 W/m·K | 10.6 BTU/hr·ft·°F |
| Coefficient of Thermal Expansion | 10.8 x10⁻⁶ /K | 6 x 10⁻⁶ /°F |
| Specific Heat | 460 J/kg·K | 0.110 BTU/lb·°F |
| Property | Value |
|---|---|
| Electrical Resistivity | 0.8 µΩ·m (31.5 µΩ·in) |
| Product Type | Standards | Sizes | Types | Applications |
|---|---|---|---|---|
| Sheets & Plates | ASTM A564 | Thickness: 1mm – 100mm | Hot Rolled, Cold Rolled | Aerospace, marine, oil & gas, nuclear |
| Pipes & Tubes | ASTM A564 | Diameter: 6mm – 500mm | Seamless, Welded | Chemical processing, oil rigs, heat exchangers |
| Bars | ASTM A564 | Diameter: 6mm – 200mm | Round, Square, Hex | High-strength shafts, fasteners, turbine parts |
| Angles, Channels, Beams | ASTM A564 | Custom sizes available | L-Angles, U-Channels | Structural frameworks in aerospace, marine |
| Fittings | ASTM A564 | Size: 1/2″ – 36″ | Buttweld, Socket Weld | Precision parts for aerospace, nuclear |
17-4 PH (630) Stainless Steel is ideal for high-stress, high-strength applications across industries:
Comparative Insight: Compared to 304 stainless, 17-4 PH offers higher yield strength and can withstand higher stress loads post-age-hardening. However, 17-4 PH is more limited at high temperatures compared to fully austenitic grades.
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