ASTM A276 A479 304 316L 310S Stainless Steel Bright Bar
Feb 24, 2026
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With stable inventory and extensive export experience, GNEE provides Material Test Certificates (MTC/EN 10204 3.1), chemical composition analysis, mechanical property testing, hardness testing, and third-party inspection services. Our products are designed to meet the requirements of sectors such as petrochemicals, pressure equipment, food machinery, mold manufacturing, automotive components, and high-temperature industrial applications.
We supply 304, 316L, and 310S stainless steel bright bars compliant with ASTM A276 and ASTM A479/A479M standards. Available shapes include round, square, hexagonal, and flat bars, with diameters ranging from 3 mm to 500 mm and lengths from 1,000 mm to 6,000 mm (custom processing also available). Manufactured using cold-drawing, cold-rolling, peeling, and precision polishing processes, the bars come in various surface finishes-such as Bright, BA, Polished, and No. 4-and feature dimensional tolerances that meet the requirements of precision machining.
For assistance, please provide the following information:
The grade and shape you require (e.g., 304 round bar, 316L hexagonal bar)
Dimensions and length
Intended use
I can help you determine the appropriate standards and specifications.
A276 vs. A479: Key Difference
| Standard | Scope | Key Requirements |
| ASTM A276 (ASME SA-276) | General engineering bar & shapes | General corrosion resistance; machined parts, shafts, fasteners, structural components |
| ASTM A479 (ASME SA-479) | Boilers & pressure vessels | Mandatory solution annealing, per-bar end hardness testing, stricter traceability; adopted by ASME BPVC |
"Black" vs. "Bright" - What the Finishes Mean
| Finish | Manufacturing Process | Surface | Typical Use |
| Black (Hot-Rolled) | Hot-rolled, as-rolled or pickled/descaled | Dark oxide scale; rough; no machining allowance | Forging stock, heavy structural parts, further machining |
| Bright (Cold-Drawn / T&P) | Cold-drawn, peeled, turned & polished, or centreless ground | Smooth, bright, tight tolerances (h8–h11) | Precision shafts, pump/valve components, final-dimension parts |
Grade-Specific Details
| Parameter | 304 (S30400) | 316L (S31603) | 310S (S31008) |
| Composition | 18Cr-8Ni | 16-18Cr-10-14Ni-2-3Mo, low C | 24-26Cr-19-22Ni, low C |
| Tensile (min, ksi) | 75 (hot) / 90 (cold, ≤½") | 70 (hot) / 85 (cold, ≤½") | 75 (hot) |
| Yield (min, ksi) | 30 (hot) / 45 (cold, ≤½") | 30 (hot) / 40 (cold, ≤½") | 30 (hot) |
| Elongation (min, %) | 40 (hot) / 30 (cold) | 35 (hot) / 30 (cold) | 40 (hot) |
| Max Service Temp | ~1,500 °F (815 °C) | ~1,500 °F (815 °C) | ~2,500 °F (1,370 °C) |
| Key Advantage | General purpose, best weldability | Superior chloride/pitting resistance | Exceptional high-temperature oxidation resistance |
| Magnetic | No (annealed) | No (annealed) | No (annealed) |
Size Ranges & Tolerances
| Product Form | Black (Hot-Rolled) | Bright (Cold-Drawn / T&P) |
| Round Bar | ½" – 12" (13–305 mm) dia. | ⅛" – 3" (3–75 mm) dia.; Peeled & Polished up to 6" (150 mm) |
| Square Bar | ¼" – 8" (6–200 mm) | ⅛" – 4" (3–100 mm) |
| Hex Bar (A/F) | ⅜" – 4" (10–100 mm) | ⅛" – 4" (3–100 mm) |
| Flat Bar | ⅜" – 4" thick × ⅜" – 20" wide | ⅛" – 2" thick × ⅜" – 12" wide |
| Tolerance | ±0.5 mm (25–50 mm dia.); ±1.0 mm (50–100 mm) | h8–h11 (ISO 286); turned: +0 to −0.070 mm (6–18 mm) up to +0 to −0.250 mm (>400 mm) |
| Standard Length | 3–6 m random; cut-to-length +2/−0 mm | 3–6 m / exact length |
304 vs.316Lvs.316L ：Bright Bar Applications
| Grade | Black Bar Applications | Bright Bar Applications |
| 304 | Forging stock, structural frames, general fabrication | Pump shafts, food processing equipment, architectural hardware, general mechanical parts |
| 316L | Marine structural stock, chemical plant frames | Marine hardware, chemical processing shafts, medical/surgical components, pharmaceutical equipment, desalination systems |
| 310S | Furnace components, heat exchanger tubes, flue gas ducts, kiln furniture | High-temperature shafts, burner tips, exhaust system components, catalytic converter supports |
A479 Vs. A276: How to choose?
A479 (SA-479): Bar is going Inside A Pressure Vessel Or Boiler - staybolts, nozzle internals, flange ring segments, baffles. ASME code stamp requires it.
A276 (SA-276): Everything else - machined parts, shafts, fasteners, structural components, general corrosion-resistant applications.
In practice, most 304/316L/310S bar in the US market is ordered to A276. A479 is specified when the part is a pressure-retaining component per ASME Section I or VIII.
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