Stainless Steel Grade 15-5 (UNS S15500)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Cold Working
Welding
Forming
Machinability
Heat Treatment
Hot Working
Applications

Introduction

Stainless steels are known as high-alloy steels with good corrosion resistance thanks to the large amounts of chromium available in these steels. Most of the stainless steels contain about 10% of chromium.

Stainless steels are available in three different groups based on their crystalline structure. These groups include martensitic, austenitic and ferritic. The combination of martensitic and ferritic steels forms a fourth group of stainless steels known as precipitation-hardened steels.

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

The chemical composition of stainless steel-grade 15-5 is outlined in the following table.

Element Content (%)
Iron, Fe 75
Chromium, Cr 14.8
Nickel, Ni 4.5
Copper, Cu 3.5
Silicon, Si 1.0
Manganese, Mn 1.0
Nb + Ta 0.3
Carbon, C 0.070
Phosphorous, P 0.040
Sulfur, S 0.030

Physical Properties

The following table shows the physical properties of stainless steel-grade 15-5.

Properties Metric Imperial
Density 7.80 g/cm3 0.282 lb/in³

Mechanical Properties

The mechanical properties of stainless steel-grade 15-5 are displayed in the following table.

Properties Metric Imperial
Tensile strength 1380 MPa 200000 psi
Yield strength (@strain 0.200 %) 1275 MPa 184900 psi
Elastic modulus 196 GPa 28427 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 10.00% 10.00%
Charpy impact 10.0 J 7.38 ft-lb
Hardness, Brinell 420 420
Hardness, Knoop (converted from Brinell hardness) 451 451
Hardness, Rockwell B (converted from Brinell hardness) 104 104
Hardness, Rockwell C (converted from Brinell hardness) 44.2 44.2
Hardness, Vickers (converted from Brinell hardness) 445 445

Thermal Properties

The thermal properties of stainless steel-grade 15-5 are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@-73.0-21.0°C/-99.4-69.8°F) 10.4 µm/m°C 5.78 µin/in°F
Thermal conductivity (@150°C/302°F) 17.8 W/mK 124 BTU in/hr.ft².°F

Other Designations

Equivalent materials to stainless steel-grade 15-5 are:

  • AMS 5659
  • AMS 5826
  • AMS 5862
  • ASTM A564 (XM-12)
  • ASTM A693 (XM-12)
  • ASTM A705 (XM-12)

Fabrication and Heat Treatment

Annealing

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

Cold Working

Stainless steel-grade 15-5 is not suitable for cold working though it can be formed in a moderate manner.

Welding

Stainless steel-grade 15-5 is welded by shielded fusion or resistance methods and AWS E/ER630 is the filler metal used for this process.

Forming

Stainless steel-grade 15-5 is capable of being formed only in a mild manner. Best results can be obtained when this alloy is formed in the overaged condition.

Machinability

Stainless steel-grade 15-5 can be machined in all attainable conditions and machining in H1150M is recommended for this alloy to obtain best tool life.

Heat Treatment

Stainless steel-grade 15-5 can be heat treated in the following conditions:

  • CONDITION A: Soak the material for 0.5 h at 1038°C (1900°F) and then cool the material in air.
  • CONDITION H 900: The Condition A material is soaked for 1 h at 482°C (900°F) and cooled in air.
  • CONDITION H 925, H 1025, H1075, H 1100, H 1150: Soak Condition A material for 4 h at desired temperature and air cool.
  • CONDITION H 1150M: Soak Condition A material for 2 h at 760°C (1400°F) and air cool. This material is also heated for 4 h to 621°C (1150°F) and finally cooled in air.

Hot Working

All common hot working methods can be used for hot working stainless steel-grade 15-5. After being hot worked, the material is annealed to obtain good heat treat response.

Applications

Stainless steel-grade 15-5 is used in fabricated parts in high pressure corrosive environments including gears, valves, fittings, fasteners and shafts and in aircraft components.

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