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Stainless Steel - AISI 302HQ / 1.4567

Description

AISI 302HQ, also known as Grade 302HQ/1.4567, is a specialized austenitic stainless steel alloy with excellent cold formability and corrosion resistance. It is widely used for manufacturing stainless steel fasteners such as self-tapping screws, machine screws, bolts, and rivets.

Chemical Composition

Element Min Max
Carbon (C) - 0.03
Manganese (Mn) - 2.00
Phosphorus (P) - 0.045
Phosphorus (P) - 0.030
Silicon (Si) - 1.00
Chromium (Cr) 17.0 19.0
Nickel (Ni) 8.0 10.5
Copper (Cu) 2.0 4.0

Mechanical Properties (Annealed)

Property Value
Tensile Strength, min 515 MPa
Yield Strength (0.2% Proof), min 205 MPa
Elongation in 50 mm, min 40%
Hardness, max 201 HB

Thermal & Physical Properties

  • Density: 8.03 g/cm³ (0.29 lb/in³)
  • Modulus of Elasticity: 200 GPa (29 x 10⁶ psi)
  • Mean Coefficient of Thermal Expansion: 20-100°C (68-212°F): 16.6 x 10⁻⁶ cm/cm°C (9.2 x 10⁻⁶ in/in/°F)
  • Thermal Conductivity at 100°C (212°F): 16.3 W/m•K (9.4 Btu/(hr•ft²•°F/ft))
  • Specific Heat: 500 J/kg•K (0.12 Btu/lb/°F)
  • Other Designations

  • UNS S30430
  • WNR 1.4567
  • XM-7
  • 304Cu
  • 304HQ
  • Fabrication and Heat Treatment

  • Solution Treatment (Annealing): Heat to 1010-1120°C (1850-2050°F) and cool rapidly. This grade cannot be hardened by thermal treatment.
  • Welding: Use Grade 308L rods or electrodes. Excellent weldability by all standard fusion methods, both with and without filler metals.
  • Machining: Possible but not often done due to low sulfur content for improved formability.
  • Applications

  • Food processing equipment
  • Transport and storage equipment (e.g., beer brewing, milk processing, wine making)
  • Kitchen benches, sinks, troughs, equipment, and appliances
  • Architectural paneling, railings, and trim
  • Chemical containers, including for transport
  • Heat exchangers
  • Woven or welded screens
  • Threaded fasteners
  • Springs
  • Supplied Forms

  • Wire
  • Bar
  • Fasteners (e.g., self-tapping screws, machine screws, bolts, rivets)
  • Features

  • Excellent corrosion resistance, equal to or exceeding that of Grade 304
  • Resistance to pitting and crevice corrosion in warm chloride environments
  • Resistance to stress corrosion cracking above 50°C (122°F)
  • Good oxidation resistance in intermittent service to 870°C (1600°F) and continuous service to 925°C (1700°F)
  • Continuous use in the 425-860°C (800-1600°F) range is usually safe due to low carbon content
  • Lowest work hardening rate among common austenitic stainless steels, resulting in a tensile strength increase of approximately 8 MPa per 1% reduction of area during cold work