What is Stainless Steel Grade 15-5 (UNS S15500)?

Stainless Steel Grade 15-5 (UNS S15500)

Stainless steel-grade 15-5 is a precipitation hardening, martensitic, chromium-nickel-copper stainless steel. This steel has transverse toughness and ductility, hardness capability, good strength and corrosion resistance.

The following datasheet provides an overview of stainless steel-grade 15-5. 

Chemical Composition

ElementContent(%)
Iron (Fe)75
Chromium (Cr)14.8
Nickel (Ni)4.5
Copper (Cu)3.5
Silicon (Si)1
Manganese (Mn)1
Nb + Ta0.3
Carbon (C)0.070
Phosphorous (P)0.040
Sulfur (S)0.030

 

Physical Properties

PropertiesMetricImperial
Density7.80g/cm³0.282 lb/in³

 

Mechanical Properties

PropertiesMetricImperial
Tensile Strength1380 MPa200000 psi
Yield Strength (@ strain 0.200%)1275 MPa184900 psi
Elastic Modulus196 GPa28427 ksi
Poisson’s Ratio0.27-0.300.27-0.30
Elongation at Break10%10%
Hardness, Brinell420420
Hardness, Knoop (converted from Brinell)451451
Hardness, Rockwell B (converted from Brinell)104104
Hardness, Rockwell C (converted from Brinell)44.244.2
Hardness, Vickers (converted from Brinell)445445

 

Thermal Properties

PropertiesMetricImperial
Thermal Expansion (@-73-21°C/-99.4-69.8°F)10.4µm/m°C5.78µ/in°F
Thermal Conductivity (@150°C/302°F)17.8 W/mK124 BTU in/hr.ft².°F

 

Fabrication and Heat Treatment

Machinability

15-5 steels can be machined in all conditions. To obtain best tool life, machine in H1150M.

Welding

Grade 15-5 steel can be welded by shielded fusion or resistance methods. AWS E/ER630 is the filler metal.

Forming

Stainless steel-grade 15-5 can only be formed mildly. Form while overaged for best results.

Heat Treatment

Stainless steel-grade 15-5 can be heat treated as follows:

  • CONDITION A: Soak for 0.5 h at 1038°C (1900°F). Cool in air.
  • CONDITION H 900: Soak condition A material for 1 h at 482°C (900°F). Cool in air.
  • CONDITION H 925, H 1025, H1075, H 1100, H 1150: Soak Condition A material for 4 h at temperature. Cool in air..
  • CONDITION H 1150M: Soak Condition A material for 2 h at 760°C (1400°F). Cool in air. Also heat for 4 h to 621°C (1150°F). Cool in air.

Hot Working

Stainless steel-grade 15-5 can be worked hot with all methods. Anneal afterward for good heat treat response.

Cold Working

Grade 15-5 steel is not suitable for cold working.

Annealing

Stainless steel-grade 15-5 is annealed at 1038°C (1900°F) for 1 h followed by rapid cooling.

Applications

Stainless steel-grade 15-5 is used in fabricated parts in high pressure corrosive environments including:

  • Gears
  • Valves
  • Fittings
  • Fasteners
  • Shafts
  • Aircraft components



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