SS 304 Flat Bars (UNS S30400) offer a balance of corrosion resistance, formability and weldability for structural supports, brackets and fabricated components. SS 304L Flat Bars (UNS S30403) have a lower carbon limit, helping reduce sensitisation during welding and making them suitable for welded assemblies requiring improved resistance to intergranular corrosion.
Metalloy Steel supplies SS 304 / 304L Flat Bars in India for fabrication, machining and industrial projects. Buyers can enquire about ASTM A240 / ASME SA240 plate-derived flat products or ASTM A276 / ASTM A479 bar products, depending on the required form and specification. Share your thickness, width, length, grade and quantity to request a quotation.
Comprehensive standard parameters and dimensions for SS 304 / 304L flat bar products.
| Specification | Details |
|---|---|
| Product Name | SS 304 / 304L Flat Bars |
| Material Grades | SS 304, SS 304L |
| UNS Designation | S30400, S30403 |
| Applicable Standards | ASTM A240 / ASME SA240, ASTM A276, ASTM A479 |
| Thickness Range | 1 mm to 100 mm, subject to product availability and specification |
| Dimensions | As per agreed width, thickness and length requirements |
| Product Form | Stainless steel flat bars / flats |
| Supply Length | Standard or cut-to-length, subject to availability |
| Chemical Composition & Mechanical Properties | Tested and certified to relevant ASTM / ASME specifications |
International standard designations corresponding to UNS S30400 and UNS S30403.
| Standard | UNS | AFNOR | Werkstoff No. | BS | EN | GOST | JIS |
|---|---|---|---|---|---|---|---|
| SS 304 | S30400 | Z7CN18-09 | 1.4301 | 304S31 | X5CrNi18-10 | 08Х18Н10 | SUS 304 |
| SS 304L | S30403 | Z3CN18-10 | 1.4306 / 1.4307 | 304S11 | X2CrNi18-9 / X2CrNi19-11 | 03Х18Н11 | SUS 304L |
| Chemical Element | SS 304 (UNS S30400) | SS 304L (UNS S30403) |
|---|---|---|
| Carbon (C) | 0.08% max | 0.035% max |
| Manganese (Mn) | 2.00% max | 2.00% max |
| Silicon (Si) | 0.75% max | 1.00% max |
| Phosphorus (P) | 0.045% max | 0.045% max |
| Sulphur (S) | 0.030% max | 0.030% max |
| Chromium (Cr) | 18.00–20.00% | 18.00–20.00% |
| Nickel (Ni) | 8.00–11.00% | 8.00–13.00% |
| Property | Value |
|---|---|
| Density | 7.93 g/cm³ |
| Melting Point | 1400°C |
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% offset) | 205 MPa |
| Elongation | 35% |
For other stainless steel grades and product forms, explore our Flat Bars range.
Estimate real-time linear mass and total order weight for SS 304 / 304L and other stainless steel flat bars with our live 3D visualizer engine.
Metalloy Steel supplies SS 304 / 304L Flat Bars in hot-rolled, cold-finished, and cut-to-length formats to suit specific manufacturing and fabrication needs.
Suitable for structural fabrication and applications where further machining or finishing may be required.
Used where tighter dimensional control and a more uniform surface are specified.
Supplied in specified lengths to suit fabrication and machining requirements.
* Availability of each condition, size and finish should be confirmed before ordering.
Engineered for versatility, formability, and reliable corrosion resistance across diverse engineering applications.
Suitable for cutting, forming and welding using appropriate procedures.
SS 304 performs well in many atmospheric and general industrial environments with suitable surface care.
SS 304L's lower carbon content helps reduce the risk of intergranular corrosion associated with sensitisation after welding.
The rectangular cross-section suits brackets, support frames, mounting plates and fabricated sections.
Typical components and industrial sectors relying on SS 304 and 304L stainless steel flats.
| Industry | Typical Applications |
|---|---|
| Construction & Fabrication | Brackets, supports and frames |
| Food Processing | Equipment supports and fabricated components |
| Chemical Processing | Structural fittings and equipment parts |
| Automotive & Machinery | Mounting plates, spacers and machine components |
| Pharmaceutical | Fabricated supports and equipment structures |
| General Engineering | Base plates, fixtures and custom-fabricated parts |
Metalloy Steel can discuss inspection and documentation requirements for SS 304 / 304L Flat Bars according to the purchase specification and order scope.
Can be requested, subject to availability, documenting heat analysis and verified properties.
Can help verify alloy grade and ensure conformance with UNS S30400 / S30403 standards.
Verification against specified composition requirements for chromium, nickel, and carbon.
Subject to the applicable standard and order requirements including tensile, yield, and elongation.
Checks for thickness, width, length, edge condition and visible surface defects.
Can be arranged subject to availability and project requirements with accredited inspection agencies.
Clear technical answers to frequent queries regarding SS 304 / 304L flat bar supply and specifications.
SS 304 has a carbon limit of 0.08% maximum, while SS 304L has a lower limit of 0.035% maximum. SS 304L is often preferred for welded assemblies where reduced sensitisation is important.
ASTM A240 / ASME SA240, ASTM A276 and ASTM A479 may apply depending on the actual product form and intended service. Confirm the required specification when ordering.
The supplied reference lists a thickness range of 1–100 mm. Confirm the required thickness, width and length for availability.
Yes. Both grades are generally weldable using suitable procedures. SS 304L is often selected when its lower carbon content benefits the welded assembly.
They may suit some applications, but prolonged chloride exposure can cause pitting or crevice corrosion. Grade selection should reflect the actual service conditions.
Provide the grade, thickness, width, length, quantity and required standard. Include any inspection or documentation requirements.
Contact Metalloy Steel with your required grade, dimensions and quantity to enquire about SS 304 / 304L Flat Bars in India. Product availability, applicable standards and documentation can be confirmed against your requirements.
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