Stainless Steel - Grade 301 1/2 Hard (UNS S30100)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Stainless steels are known as high-alloy steels. They contain about 4-30% of chromium. They are further divided into martensitic, austenitic, and ferritic steels. Another group of stainless steels are known as precipitation-hardened steels. They are a combination of austenitic and martensitic steels.

Grade 301 1/2 hard stainless steel has high strength. The following datasheet gives an overview of grade 301 1/2 hard stainless steel.

Chemical Composition

The following table shows the chemical composition of grade 301 1/2 hard stainless steel.

Element Content (%)
Iron, Fe 73
Chromium, Cr 16.0-18.0
Nickel, Ni 6.0-8.0
Manganese, Mn 2.0
Silicon, Si 0.75
Carbon, C 0.15
Nitrogen, N 0.10
Phosphorous, P 0.045
Sulfur, S 0.030

Physical Properties

The physical properties of grade 301 1/2 hard stainless steel are displayed in the following table.

Properties Metric Imperial
Density 8.03 g/cm3 0.290 lb/in³

Mechanical Properties

The following table outlines the mechanical properties of grade 301 1/2 hard stainless steel.

Properties Metric Imperial
Tensile strength 1034 MPa 150000 psi
Yield strength (@ strain 0.200%) 758 MPa 110000 psi
Compressive yield strength (longitudinal) 621 MPa 90100 psi
Compressive yield strength (transverse) 979 MPa 142000 psi
Fatigue strength 379 MPa 55000 psi
Charpy impact 150 J 111 ft-lb
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (in 2" (50 mm)) 18% 18%
Hardness, Brinell 297 297
Hardness, Rockwell C (converted from Brinell hardness) 32 32

Thermal Properties

The thermal properties of grade 301 1/2 hard stainless steel are displayed in following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-100°C/68-212°F) 16.6 µm/m°C 9.22 µin/in°F
Thermal conductivity (@ 100°C/212°F) 16.3 W/mK 113 BTU in/hr.ft².°F

Other Designations

Other designations equivalent to grade 301 1/2 hard stainless steel include AMS 5518.


Grade 301 1/2 hard stainless steel is used in the following applications:

  • Wheel cover
  • Kitchen equipment
  • Hose clamps
  • Roof draining systems
  • Conveyor belts
  • Truck and trailer bodies
  • Springs
  • Automobile molding and trim
  • Railway and subway cars

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