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Technical Specifications
Product Overview
304 Stainless Steel Round Bar is manufactured from premium grade 304 austenitic stainless steel, providing excellent corrosion resistance, formability, and weldability. This versatile round bar is ideal for machining, fabrication, and structural applications across various industries.
Key Features:
- Excellent corrosion resistance in mild to moderate environments
- Superior machinability and formability
- Non-magnetic in annealed condition
- FDA approved for food contact applications
- High strength-to-weight ratio
- Excellent weldability without pre-heating
Manufacturing Process: Produced through hot rolling followed by cold drawing and annealing processes to achieve precise dimensional tolerances and superior surface finish. Available in both annealed and cold worked conditions.
Applications: Machined components, fasteners, shafts, food processing equipment, pharmaceutical equipment, chemical processing components, marine hardware, architectural applications, and general engineering applications requiring corrosion resistance.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A276 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 | 620 MPa | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 205 MPa min | 310 MPa | ASTM A370 | Room Temp |
| Elongation | 40% min | 50% | ASTM A370 | Room Temp |
| Hardness (Brinell) | 201 HB max | 180 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | 92 HRB max | 88 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 200 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 325+ 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 Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Diameter | 3mm - 300mm | Various | Yes | h9 (±0.1mm) |
| Length | 1m - 12m | 6m | Yes | +50mm/-0mm |
| Surface Finish | Hot Rolled, Cold Drawn, Bright | Cold Drawn | Yes | Ra ≤ 0.8μm |
| Condition | Annealed, Cold Worked | Annealed | Both | ASTM A276 |
| Straightness | 1mm/m max | Standard | Precision | ±0.5mm/m |
| End Finish | Cut, Machined, Chamfered | Cut | Yes | Square ±1° |
| Standards Compliance | ASTM A276, A479, A582 | A276 | Multiple | Full compliance |
| Size Tolerance | h8 to h11 | h9 | Yes | ISO 286-2 |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Hexagonal, Individual | Bundles | Custom | Export standard |
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Our Advantages in Processing บาร์กลมสแตนเลส 304
Precision Cold Drawing Process
Advanced cold drawing manufacturing technique ensures precise dimensional accuracy and superior surface finish on the round bar. This process enhances material strength while maintaining tight diameter tolerances throughout the entire length.
Controlled Heat Treatment
Specialized heat treatment process optimizes the microstructure of 304 stainless steel, resulting in excellent corrosion resistance and mechanical properties. This ensures consistent quality and performance across all production batches.
Surface Finishing Excellence
Multi-stage polishing and surface treatment process delivers a smooth, glossy finish with minimal surface defects. This ensures both aesthetic appeal and optimal resistance to environmental factors in various applications.
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