304 / 304L Stainless Steel Flat Bar
Stellanox Steel offers precision-engineered 304 / 304L Stainless Steel Flat Bars, known for their versatility, corrosion resistance, and excellent mechanical properties. Ideal for structural reinforcement, fabrication, bracing, and architectural frameworks, these flat bars are widely used across industries such as construction, food processing, marine, and pharmaceuticals.
Available in a range of thicknesses and widths, 304/304L flat bars offer excellent workability, strength, and aesthetic appeal.
What is 304 / 304L Stainless Steel Flat Bar?
304 / 304L Stainless Steel Flat Bar is a solid rectangular section made from austenitic stainless steel with 18–20% chromium and 8–12% nickel. The “L” version (304L) has a reduced carbon content, improving weldability and minimizing the risk of carbide precipitation, especially in high-temperature welding zones.
These flat bars are supplied in hot-rolled, pickled, annealed, or cold-drawn finishes, depending on application requirements.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 304 / 304L Stainless Steel Flat Bar
- Excellent Corrosion Resistance: Performs well in moisture-rich and mildly acidic environments.
- High Weldability (304L): Ideal for structural applications requiring welding without post-treatment.
- Good Strength-to-Weight Ratio: Suitable for bracing, supports, and reinforcement.
- Non-Magnetic (Annealed): May become slightly magnetic after cold working.
- Highly Machinable and Formable: Great for CNC and custom fabrication.
- Clean Surface Finish: Preferred for architectural and sanitary uses.
Specification Chart – 304 / 304L Stainless Steel Flat Bar
| Property | Details |
|---|---|
| Grade | 304 / 304L (UNS S30400 / S30403) |
| Standards | ASTM A276, ASTM A484, EN 10088-3 |
| Thickness Range | 3 mm – 50 mm |
| Width Range | 12 mm – 300 mm |
| Length | Up to 6 meters or custom-cut |
| Finish | Hot Rolled, Cold Drawn, Polished |
| Tolerance | As per ASTM or custom requirements |
Chemical Composition – 304 / 304L Stainless Steel Flat Bar
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 12.0 |
| Carbon (C) | ≤ 0.08 (304), ≤ 0.03 (304L) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties – 304 / 304L Stainless Steel Flat Bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 (Annealed) |
| Density | 8.00 g/cm³ |
Equivalent Grades – 304 / 304L Stainless Steel Flat Bar
| Standard | Grade |
|---|---|
| ASTM | 304 / 304L |
| EN | 1.4301 / 1.4307 |
| JIS | SUS 304 / 304L |
| UNS | S30400 / S30403 |
| DIN | X5CrNi18-10 / X2CrNi18-9 |
Applications of 304 / 304L Stainless Steel Flat Bar
- Structural Bracing and Framework
- Food Processing and Packaging Equipment
- Marine and Coastal Architectural Elements
- Pharmaceutical Equipment and Storage
- Support Plates and Mounting Brackets
- Decorative Trim and Rails
Benefits of 304 / 304L Stainless Steel Flat Bar
- Excellent corrosion resistance across a wide range of environments
- Readily machinable and formable
- Superior aesthetic finish for exposed or decorative use
- High weldability for fabrication without cracking
- Versatile use in hygienic, structural, and commercial applications
- Long service life with minimal maintenance
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