SUS 304 is a highly versatile and widely used austenitic stainless steel. Known for its excellent corrosion resistance, mechanical strength, and adaptability, it is often referred to as 18-8 stainless steel due to its composition of approximately 18% chromium (Cr) and 8% nickel (Ni). This material is extensively employed in industries such as construction, food processing, and chemicals.
Material Characteristics of SUS 304
- Corrosion Resistance: SUS 304 performs exceptionally well against water, acids, and alkalis, making it ideal for corrosive environments.
- Machinability: It is easy to cut, form, and weld, making it suitable for various machining processes.
- High-Temperature Resistance: It remains stable under high temperatures, making it useful for heat exchangers and burner components.
- Low Magnetism: At room temperature, it is nearly non-magnetic, which is important for electronics and medical devices.
Chemical Composition of SUS 304
- Chromium (Cr): ~18%, enhancing corrosion resistance.
- Nickel (Ni): ~8%, improving corrosion resistance and structural stability.
- Carbon (C): Less than 0.08%, minimizing carbide precipitation during welding.
- Iron (Fe): Base element providing structural stability.
304 Chemical Properties (%)
|
ITEM
|
C |
SI |
MIN |
P |
S |
CR |
NI |
N |
OTHERS |
|---|---|---|---|---|---|---|---|---|---|
| Min | === | === | === | === | === | 17.50 | 8.00 | === | === |
| Max | 0.03 | 0.75 | 2.00 | 0.45 | 0.030 | 19.50 | 12.00 | === | === |
Mechanical Properties of SUS 304
- Tensile Strength: 520-600 MPa, providing strong structural support.
- Yield Strength: 205-240 MPa, ensuring resilience under stress.
- Elongation: Over 40%, indicating excellent ductility.
304 Mechanical Properties
| MIN | MAX | ||
|---|---|---|---|
| Yield Strength (N/mm2) | 0.20% Y.S. | 205 | N/mm2 |
| 1% Y.S. | === | ||
| Tensile Strength (N/mm2) | 520 | N/mm2 | |
| Elongation % | 40 | === | |
| Hardness Test | HRB | === | 90 |
| HV | === | 200 |
Physical Properties of SUS 304
- Density: ~7.93 g/cm³, balancing strength and weight.
- Thermal Conductivity: ~16.3 W/m·K, enabling effective heat transfer.
- Electrical Conductivity: Moderate, making it suitable for electrical applications.
Corrosion Resistance of SUS 304
- Water and Humid Environments: Highly resistant, making it common in construction, kitchen equipment, and water systems.
- Chemical Environments: Resistant to various chemicals, suitable for tanks, pipelines, and chemical equipment.
- Food Processing: Ensures no impact on food quality or taste, ideal for processing and storage.
- Pharmaceutical Use: Non-contaminating, making it suitable for lab and pharmaceutical equipment.
Applications of SUS 304
- Construction: Used in architectural structures, exterior finishes, and roofing.
- Food and Beverage Industry: Found in kitchen utensils, food processing equipment, and containers.
- Chemical Industry: Ideal for tanks, pipelines, and valves.
- Medical Equipment: Common in surgical instruments and laboratory tools.
- Automotive Sector: Used in exhaust systems, drive shafts, and fasteners.
- Energy and Environmental Protection: Employed in solar panels, energy systems, and wastewater treatment facilities.
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