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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