What is Stainless Steel Grade 15-7 (UNS S15700)?

Grade 15-7 stainless steel is a semi-austenitic precipitation hardening stainless steel. It has high strength and moderate corrosion resistance.

The following datasheet gives an overview of grade 15-7 stainless steel.

Chemical Composition

ElementContent (%)
Iron (Fe)74.9
Chromium (Cr)15
Nickel (Ni)7
Molybdenum (Mo)2
Aluminum (Al)1.1

 

Physical Properties

PropertiesMetricImperial
Density7.81g/m³0.282 lb/in³

 

Mechanical Properties

PropertiesMetricImperial
Tensile Strength900 MPa131000 psi
Yield Strength (@ strain 0.200%)380 MPa55100 psi
Elastic Modulus190-210 GPa27557-30458 ksi
Poisson’s Ratio0.27-0.300.27-0.30
Elongation at Break30%30%
Hardness, Rockwell B (converted from Brinell Hardness)8888

 

Thermal Properties

PropertiesMetricImperial
Thermal Expansion (a21-93°C/199°F)9µm/m°C5µin/in°F
Thermal Conductivity (@21°C/70°F)15.1 W/mK105 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

When hardened, grade 15-7 stainless steel has good machinability.

Welding

Use common arc and resistance methods. Do not use Inert gas shielding to prevent aluminum oxidation.

Heat Treatment

Cold work solution treated material for condition C material. Heat condition C material at 482°C (900°F) for 1 h before cooling.

Heat solution treated material at 955°C (1750°F) for 10 min in A1750 condition followed. R100 condition is cooled at -73°C (-100°F) for 8 h within 1 h of treating to A1750 condition. Heat again at 510°C (950°F) for 1 h in the RH 950 condition.

Heat at 760°C (1400°F) after fabrication for 90 min in the condition T. Cool again at 13°C (55°F) for 0.5 h within 60 min. Heated at 565°C (1050°F) for 90 min in TH1050 condition. Cool in airr.

Hot Working

15-7 stainless steel hot works well. Anneal afterward to respond to heat treatment.

Cold Working

Grade 15-7 stainless steel is limited to cold working.

Annealing

Anneal at 1038°C (1900°F). Cool rapidly.

Applications

Grade 15-7 stainless steel is used in the following applications:

  • Diaphragms
  • Welded and brazed honeycomb panels
  • Retaining rings
  • Aircraft bulkheads
  • Springs
  • Other applications requiring high strength at elevated temperatures

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