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Technical Specifications
Product Overview
304 #4 (Brushed) Stainless Steel Sheet is manufactured from premium grade 304 stainless steel with a distinctive brushed finish. The #4 finish provides a uniform, directional satin appearance achieved through progressive polishing with abrasives, making it ideal for architectural and decorative applications where aesthetics are important.
Key Features:
- Attractive brushed satin finish with uniform grain pattern
- Excellent corrosion resistance in most environments
- Easy to clean and maintain surface
- Good formability for fabrication operations
- Non-magnetic in annealed condition
- FDA approved for food contact applications
Manufacturing Process: Hot rolled and cold rolled to final thickness, followed by annealing and descaling. The #4 brushed finish is achieved through mechanical polishing with 150-180 grit abrasives in a unidirectional pattern.
Applications: Kitchen equipment, food processing machinery, architectural panels, elevator interiors, restaurant equipment, decorative trim, appliance components, and general fabrication where an attractive finish is required.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A240 Requirement |
|---|---|---|---|---|
| Carbon (C) | - | 0.080 | 0.045 | ≤ 0.08 |
| Chromium (Cr) | 18.0 | 20.0 | 18.5 | 18.0-20.0 |
| Nickel (Ni) | 8.0 | 12.0 | 9.2 | 8.0-12.0 |
| Manganese (Mn) | - | 2.00 | 1.45 | ≤ 2.00 |
| Silicon (Si) | - | 0.75 | 0.42 | ≤ 0.75 |
| Phosphorus (P) | - | 0.045 | 0.028 | ≤ 0.045 |
| Sulfur (S) | - | 0.030 | 0.015 | ≤ 0.030 |
| Nitrogen (N) | - | 0.10 | 0.06 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance | 70.1 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 515 MPa min | 580 MPa | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 205 MPa min | 240 MPa | ASTM A370 | Room Temp |
| Elongation | 40% min | 50% | ASTM A370 | Room Temp |
| Hardness (Brinell) | 201 HB max | 170 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | 92 HRB max | 85 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 200 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 300+ J | ASTM E23 | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 8.00 | g/cm3 | 20°C | ASTM B311 |
| Melting Point | 1400-1450 | °C | - | DSC Analysis |
| Thermal Conductivity | 16.2 | W/m·K | 100°C | ASTM E1461 |
| Specific Heat | 500 | J/kg·K | 0-100°C | ASTM C351 |
| Linear Expansion | 17.2 | μm/m·K | 0-100°C | ASTM E228 |
| Electrical Resistivity | 720 | n|°¤m | 20°C | ASTM B193 |
| Magnetic Permeability | 1.02 | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | None | - | - | Non-magnetic |
📏 Product Specifications
| Specification | Available Range | Standard Size | Custom Available | Tolerance |
|---|---|---|---|---|
| Thickness | 0.3mm - 50mm | 1.0mm - 6.0mm | Yes | ±0.05mm |
| Width | 100mm - 2000mm | 1000mm, 1219mm, 1500mm | Yes | ±3mm |
| Length | 500mm - 6000mm | 2000mm, 2438mm, 3000mm | Yes | ±5mm |
| Surface Finish | #4 Brushed (Satin) | #4 Brushed | No | Ra 0.4-0.8μm |
| Grain Direction | Longitudinal, Transverse | Longitudinal | Yes | Uniform |
| Edge Condition | Mill Edge, Slit Edge | Mill Edge | Both | ASTM A480 |
| Standards Compliance | ASTM A240, A480, JIS G4305 | ASTM A240 | Multiple | Full compliance |
| Flatness | ≤ 3mm/m | ≤ 2mm/m | Yes | ASTM A480 |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Wooden Crates, Steel Pallets | Wooden Crates | Custom | Export standard |
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Our Advantages in Processing 304-#4 (ขัดเงา) แผ่นสแตนเลส
Professional #4 Brushing Process
Our advanced linear brushing technology creates a uniform, fine-grained satin finish on 304 stainless steel surfaces, ensuring consistent appearance and optimal scratch resistance while maintaining the material's inherent corrosion resistance properties.
Precise Surface Treatment
The specialized brushing process is carefully controlled to achieve a specific roughness value, resulting in a sophisticated metallic appearance that effectively masks fingerprints and minor scratches while preserving the steel's protective passive layer.
Quality Grade 304 Base
Manufacturing begins with premium grade 304 stainless steel, ensuring excellent formability and weldability during the brushing process, while maintaining superior mechanical properties and chemical resistance in the final product.
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