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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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Chemical Composition of 17-4 PH (630) Stainless Steel

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

Technical Specifications of 17-4 PH (630) Stainless Steel

Physical Properties

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

Mechanical Properties by Condition

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

Thermal Properties

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

Electrical Properties

Property Value
Electrical Resistivity 0.8 µΩ·m (31.5 µΩ·in)

Product Specifications by Solitaire Steel & Engineering LLP

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

Processing Properties

  • Heat Treatment:
    • Solution Treatment (Condition A): 1040°C for 0.5 hours, air cool.
    • Age Hardening: Low-temperature hardening for enhanced mechanical properties.
    • Aging Temperatures: Various aging treatments (e.g., H900, H1025, H1075) create differing strengths and hardnesses.
  • Machining: Machinable in annealed condition, similar to grade 304 stainless steel. Carbide tools recommended due to hardness.
  • Welding: Can be welded by all common processes without pre-heating; filler rods with similar composition advised. Post-weld aging recommended to match parent metal properties.
  • Hot Working: Perform at 950°-1200°C; requires solution treatment post-hot working for optimal properties.

Applications of 17-4 PH (630) Stainless Steel

17-4 PH (630) Stainless Steel is ideal for high-stress, high-strength applications across industries:

  • Aerospace: Turbine blades, gears, fasteners.
  • Oil & Gas: Valves, shafts, and engine parts.
  • Marine: High-strength structural parts resistant to corrosion.
  • Nuclear: Waste casks and high-strength containment applications.

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.