303/304 Stainless Steel

 

 
303/304 Stainless Steel represents the premium in machinability among the austenitic stainless steels. It is used in cases where production involves extensive machining in automatic screw machines. It is non-magnetic in the annealed condition and not hardenable by heat treatment. Tensile strength and hardness can be increased by cold working. Slight magnetism can be detected by cold working. 303 has excellent scale resistance at temperatures up to 1600° F in continuous service. It is manufactured by the electric-furnace process and meets the exacting requirements of the aircraft industry.

    Chemical Composition:

  • Sulfur 0.15%
  • Carbon 0.15%
  • Manganese 2.00%
  • Chromium 17.00-19.00%
  • Nickel 8.00-10.00%
  • Phosphorus 0.20%
  • Silicon 0.15%

    Typical Applications:

  • Aircraft fittings
  • Valves, and valve trims
  • Screw machine products
  • Bolts, and screws
  • Architectural purposes
  • Electrical switchgear components
  • Gears
  • Bushings

Thermal Properties

CTE, linear 20°C 17.2 µm/m-°C 9.56 µin/in-°F from 0-100°C
CTE, linear 250°C 17.8 µm/m-°C 9.89 µin/in-°F at 0-315°C (32-600°F)
CTE, linear 500°C 18.4 µm/m-°C 10.2 µin/in-°F at 0-540°C, 18.7 µm/m-C at 0-650°C

Heat Capacity 0.5 J/g-°C 0.12 BTU/lb-°F from 0-100°C (32-212°F)
Thermal Conductivity 16.2 W/m-K 112 BTU-in/hr-ft²-°F at 100°C (212°F), 21.5 W/m-K at 500°C (930°F)
Melting Point 1400 – 1420 °C 2550-2590 °F
Solidus 1400 °C 2550 °F
Liquidus 1420 °C 2590 °F

Physical Properties

Density 8 g/cc 0.289ib/in³

Electrical Properties

Electrical Resistivity 7.2e-005 ohm-cm
Magnetic Permeability 1.008 (at RT)