What is Stainless Steel Grade 17-4PH or Grade 630?

Grade 17-4PH stainless steels are martensitic stainless steels. They are precipitation hardened for excellent mechanical properties. Heat treatment creates high strength and hardness. Heat and corrosion profiles are similar to grade 304 steels.

Available in solution treated conditions, 14-4PH is easily machined and age-hardened for high strength. Age treatment is handled at low temperatures to avoid distortion.

The following datasheet provides an overview of stainless steel-grade 17-4PH.

Chemical Composition

ElementContent
Chromium (Cr)15-17%
Nickel (Ni)3-5%
Copper (Cu)3-5%
Manganese (Mn)< 1%
Silicone (Si)< 1%
Nb + Ta0.15-0.45%
Carbon (C)< 0.07%
Phosporus (P)< 0.04%
Sulfur (S)< 0.03%

 

Physical Properties

PropertiesMetricImperial
Density7750 kg/cm³

 

Mechanical Properties

PropertiesMetricImperial
Tensile Strength930-1310 MPa
Yield Strength (@ strain 0.200%)724-1170 MPa
Elastic Modulus197 GPa
Hardness, Brinell277-363
Hardness, Rockwell C (converted from Brinell)28-40

 

Thermal Properties

PropertiesMetricImperial
Thermal Expansion (@100-315°C/212-599°F)10.8-11.6µm/m°Cµin/in°F
Thermal Conductivity (@100-500°C/212-932°F)18-4-22.7 W/mKBTU in/hr.ft².F

 

Fabrication and Heat Treatment

Machinability

17-4PH stainless steels can be machined in the solution-treated condition. Machining rates are similar to 304 steels.

Welding

Grade 17-4PH stainless steels can be welded with all conventional methods without pre-heating. High strength steels should be designed and welded with care to prevent weldment stresses.

Heat Treatment

Condition A: Heat to 1040°C for 0.5 h. Air cool to to 30°C. Small sections can be oil quenched.

Hardening:  Age-hardened at low temperatures. Some superficial discoloration can occur, followed by shrinkage at 0.1- 0.05%.

Applications

Grade 17-4PH steel can be used in the following applications:

  • Engine components
  • High strength and boat propeller shafts
  • Plastic molding dies
  • Valves and gears

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