Hot Rolled Bright Surface AISI 630 Stainless Steel Round Bar with OD 6-300mm
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).
Note: This grade should not be used at temperatures above 572°F (300°C) or at very low temperatures.
- Offshore equipment (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 | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | - | 0.07 |
| Manganese (Mn) | - | 1.00 |
| Silicon (Si) | - | 1.00 |
| Phosphorus (P) | - | 0.04 |
| Sulfur (S) | - | 0.030 |
| Chromium (Cr) | 15.0 | 17.5 |
| Nickel (Ni) | 3.0 | 5.0 |
| Copper (Cu) | 3.0 | 5.0 |
| Niobium+Ta (Nb+Ta) | 0.15 | 0.45 |
| Condition | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell C (HRC) |
|---|---|---|---|---|
| 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 Conductivity at 100°C | 18.4 W/m·K |
| Thermal Conductivity at 500°C | 22.7 W/m·K |
| Specific Heat (0-100°C) | 460 J/kg·K |
| Electrical Resistivity | 800 nΩ·m |
Grade 630 stainless steels are typically solution treated at 1040°C for 0.5 hours followed by air cooling. Age hardening at various temperatures achieves the required mechanical properties with minimal distortion.
| 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 |
Machining: Can be machined in solution-treated condition with rates similar to grade 304 stainless steel.
Welding: Can be welded using all conventional methods without pre-heating requirements.
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