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304 Stainless Steel Sheet & Plate
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304 stainless steel sheet and plate is the most widely used austenitic stainless steel in industrial, architectural, and commercial applications. It offers an excellent balance of corrosion resistance, formability, weldability, and cost efficiency, making it a general-purpose stainless steel material for a wide range of environments.
1. What Is 304 Stainless Steel?
304 stainless steel belongs to the austenitic stainless steel family. It is primarily composed of chromium and nickel, which provide strong corrosion resistance and good mechanical properties.
Main characteristics of 304 stainless steel:
- Excellent corrosion resistance in most environments
- Good formability and deep drawing performance
- Strong weldability without significant performance loss
- Non-magnetic in annealed condition
- Stable mechanical properties at both low and high temperatures
Because of these properties, 304 stainless steel is widely considered the “standard grade” for stainless steel applications.
2. Chemical Composition of 304 Stainless Steel
Typical composition includes:
- Chromium (Cr): ~18–20%
- Nickel (Ni): ~8–10.5%
- Carbon (C): ≤0.08%
- Manganese (Mn): improves strength and hot working performance
- Silicon (Si): improves oxidation resistance
The combination of chromium and nickel is the key factor behind its corrosion resistance and toughness.
3. Main Applications of 304 Stainless Steel
304 stainless steel sheet and plate are widely used in:
- Food processing equipment
- Kitchen and catering equipment
- Chemical containers and tanks
- Architectural decoration panels
- Industrial machinery parts
- Water treatment systems
- General fabrication and structural parts
4. 304 vs 316 Stainless Steel
316 stainless steel is an upgraded version of 304 with added molybdenum (Mo), improving corrosion resistance, especially in chloride and marine environments.
| Property | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|
| Corrosion Resistance | Good | Excellent (especially chloride resistance) |
| Chemical Resistance | Suitable for general use | Better for chemical and marine environments |
| Cost Level | Lower | Higher |
| Molybdenum (Mo) | None | Present (~2–3%) |
| Application Environment | Indoor, general industry | Marine, chemical, coastal areas |
Key difference:
316 is chosen when corrosion conditions are more aggressive, especially in seawater or chemical exposure environments.
5. 304 vs 430 Stainless Steel
430 stainless steel is a ferritic stainless steel, which is very different from 304.
| Property | 304 Stainless Steel | 430 Stainless Steel |
|---|---|---|
| Structure | Austenitic | Ferritic |
| Nickel Content | High | Very low or none |
| Magnetism | Non-magnetic | Magnetic |
| Corrosion Resistance | Strong | Moderate |
| Formability | Excellent | Good but lower than 304 |
| Cost | Higher | Lower |
Key difference:
430 is more economical but has lower corrosion resistance compared with 304. It is often used in decorative and household appliance applications.
6. Processing Performance of 304 Stainless Steel
304 stainless steel is easy to process and widely used in fabrication:
- Laser cutting with clean edges
- CNC bending with good ductility
- TIG/MIG welding with stable joints
- Stamping and deep drawing for complex shapes
- Polishing and brushing for decorative surfaces
Its excellent formability makes it suitable for both industrial and decorative products.
7. Surface Finishes of 304 Stainless Steel
Common surface finishes include:
- 2B finish: smooth industrial surface
- BA finish: bright annealed surface
- No.4 finish: brushed decorative surface
- Mirror finish: high reflectivity decorative surface
Different finishes are selected based on appearance and application requirements.
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