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Stainless Steel Flat Bar
| MOQ: | 5ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Stainless Steel Flat Bar
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies stainless steel flat bar for frames, supports, brackets, base plates, machine components and architectural fabrication. The term “flat bar” can describe several different manufacturing routes, and these routes do not produce identical edge quality, surface, dimensional tolerance or mechanical condition. Shangyou therefore identifies whether the order requires true flat bar, sheared-and-edged flat, slit flat or plate-cut flat.
| Purchase Item | Supply Information |
|---|---|
| Grades | 304/304L, 316/316L, 321, 347, 410, 430, 2205, 2507 |
| Forms | True flat bar, sheared and edged, slit, plate-cut or machined flat |
| Typical Scope | Thickness 3–100 mm; width 10–300 mm; heavier sections by plate cutting |
| Length | 3 m, 6 m, 12 ft, 20 ft or cut to drawing |
| Surface | Hot rolled, pickled, 2B-derived, brushed, polished or machined |
| Edges | Mill edge, sheared edge, slit edge, deburred, rounded or machined |
| Standards | ASTM A276 for true bar where applicable; ASTM A240/A480 for plate-cut routes |
| Testing | PMI, dimensions, surface, hardness and mechanical tests as ordered |
| Processing | Sawing, shearing, laser/plasma/waterjet cutting, drilling and polishing |
| Documents | EN 10204 3.1 with route and source material identified |
True flat bar is produced as a bar product and is preferred when consistent bar geometry and rounded or mill-formed edges are required. Sheared-and-edged flat is cut from sheet or plate and may show shear deformation or edge camber unless additional edging is performed. Plate-cut flat allows broad grade and size flexibility, especially for duplex, high-alloy and heavy sections, but the cut edge and heat-affected condition depend on the cutting method. Waterjet or machining may be selected when thermal influence must be minimized.
For a useful quotation, specify thickness × width × length, grade, source route, edge condition, flatness, straightness and surface. If the flat will be visible in an architectural assembly, confirm grain direction, polishing grade and protective film. If it will be machined, state the minimum finished size and required machining allowance. ASTM A276 applies to bar products, while plate-cut flats originate from plate or sheet standards such as ASTM A240 with general requirements under ASTM A480.
Cutting options include cold sawing, band sawing, shearing, laser, plasma and waterjet. Edge deburring, radius grinding, hole drilling, slotting and surface polishing can be added. Austenitic flats can distort after asymmetric machining or heavy material removal; stress distribution, cut sequence and clamping should be planned. Duplex plate-cut flats should receive controlled thermal processing and appropriate post-cut cleaning to protect corrosion performance.
Do not treat all flat-bar routes as interchangeable. A plate-cut strip is not automatically an ASTM A276 true flat bar. Sheared edges may not meet a machined-edge requirement, and nominal thickness from plate may not provide the same tolerance as a cold-finished bar. The RFQ must identify the final use, acceptable edge profile and whether the stated dimensions are raw or finished dimensions.
| Grade / Designation | Key Chemistry (wt.%) | Density g/cm³ | Tensile MPa | Yield MPa | Elong. % | Hardness | Heat Treatment / Condition |
|---|---|---|---|---|---|---|---|
| 304 / S30400 / 1.4301 | C≤0.08; Cr 18–20; Ni 8–10.5 | 7.93 | ≥515 | ≥205 | ≥40 | ≤201 HB | Solution annealed; not hardenable by heat treatment |
| 316L / S31603 / 1.4404 | C≤0.03; Cr 16–18; Ni 10–14; Mo 2–3 | 8.00 | ≥485 | ≥170 | ≥40 | ≤217 HB | Solution annealed; rapid cooling after hot work |
| 2205 / S32205 / 1.4462 | C≤0.03; Cr 21–23; Ni 4.5–6.5; Mo 2.5–3.5; N 0.08–0.20 | 7.80 | 680–880 | ≥450 | ≥30 | ≤28 HRC | Solution annealed 1020–1100°C, water quenched |
| 410 / S41000 / 1.4006 | C≤0.15; Cr 11.5–13.5 | 7.75 | ≥450 | ≥275 | ≥20 | ≤207 HB annealed | Annealed or hardened and tempered to order |
Values are representative engineering references for common conditions. The applicable ASTM/EN standard, section size, ordered condition and MTC control acceptance. Grade 303 is frequently hardness-controlled under ASTM A582, so tensile values should not be assumed without the certified heat data.
| Process / Inspection | Purpose | Ordering Note |
|---|---|---|
| Saw cutting / cold sawing | Fixed lengths and production blanks | State length tolerance, squareness and burr requirement |
| Peeling / turning | Remove hot-worked surface and improve diameter | State final raw size and machining allowance |
| Centerless grinding | Control diameter, roundness and surface | State ISO tolerance, straightness and Ra separately |
| Chamfering / facing | Improve loading, assembly and length control | Provide angle, width, radius or finished length |
| PMI / chemistry verification | Confirm alloy family and heat identity | XRF does not independently confirm L-grade carbon |
| Hardness / mechanical tests | Verify condition and grade requirements | Test method, sampling and condition must match the standard |
| UT / third-party inspection | Evaluate internal quality and witness compliance | Define method, acceptance class, coverage and report |
- Frames and support structures
- Machine bases and guide strips
- Brackets and stiffeners
- Food-equipment frames
- Architectural trim and handrails
- Chemical and marine fabrication
Send thickness × width × length, grade, required manufacturing route, edge condition, surface, tolerance and quantity. A drawing is recommended for slots, holes, radiused edges or finished dimensions.
Request a Quote · Send Your Size List · Upload Drawing or MTO · Confirm Grade and Condition
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What is true stainless steel flat bar?
True flat bar is produced as a bar product rather than simply cut from plate. It normally has bar-type geometry and edge characteristics, but exact tolerances still depend on the ordered standard and condition.
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What is sheared-and-edged flat bar?
It is cut from sheet or plate by shearing and then edge-conditioned. It offers economical widths but can differ from true flat bar in edge shape, camber and dimensional tolerance.
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Can flat bar be cut from plate?
Yes. Plate cutting provides broad grade and thickness availability. The order should identify the plate standard, cutting method, edge finish and whether thermal cut zones must be removed.
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Which standard applies to stainless flat bar?
ASTM A276 can apply to true bar products. Plate-cut or sheared products generally originate from ASTM A240/A480 plate or sheet. The manufacturing route should be shown on the quotation and certificate.
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Can the edges be rounded or deburred?
Yes. Edge deburring, radius grinding and machining can be supplied. State the maximum edge break or required radius on the drawing.
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Can you supply polished flat bar?
Yes. Brushed and polished finishes are available. The required grit, grain direction, Ra target and protective film should be specified.
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How do I prevent distortion during machining?
Choose appropriate stock allowance, remove material symmetrically where possible and consider stress-relieved or stabilized routes for critical parts. Final flatness should be defined after machining, not only on raw stock.
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Is 316L flat bar suitable for seawater?
316L performs better than 304 in chloride exposure but is not immune to pitting or crevice corrosion. Temperature, stagnant crevices, chloride level and cleaning conditions must be evaluated.
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Can holes and slots be produced before delivery?
Yes. Drilling, laser cutting, milling and slotting can be arranged from a drawing. Hole tolerance and edge quality depend on the selected process.
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What should be included in an RFQ?
Provide grade, route, thickness, width, length, quantity, edge profile, flatness, straightness, surface finish, processing, inspection documents and end application.
