ASTM A276 Type 302 Stainless Steel Round Bar
Certification: ISO, AISI, ASTM, GB, EN, DIN, JIS
Technique: Cold Rolled
Thickness: 2mm-300mm
Width:1000mm-2000mm
Length:as Your Requirements
Diameter Tolerance:H9, H11, H13, K9, K11, K13 etc
Sample:Free-Sample
Surface:Lack, Peeled, Polishing, Bright, Sand Blast,
Transport Package: Wooden Package
SS 302 Round Bar Supplier
ASTM A276 Type 302 round bar is a classic high-strength austenitic stainless steel characterized by a carbon content of ≤0.15%, along with 17%–19% chromium (Cr) and 8%–10% nickel (Ni); the material combines superior mechanical strength and work-hardening characteristics with good corrosion resistance. In the annealed condition, its tensile strength (Rm) exceeds 515 MPa, yield strength (Rp0.2) exceeds 205 MPa, and hardness does not exceed 201 HBW; cold drawing significantly enhances its strength, making it ideal for manufacturing springs, bolts, fasteners, shafts, and high-strength mechanical components.
To fulfill global engineering procurement and machining requirements, GNEE supplies ASTM A276 Type 302 stainless steel bars covering a diameter range from 4 mm to 500 mm. Delivery conditions include hot-rolled (black bar), pickled, cold-drawn (H8/H9 tolerance precision), and precision ground/peeled bright bars (polished surface roughness Ra ≤0.8 µm), with lengths available in fixed or multiple lengths (3 to 6 meters). All materials undergo solution annealing at 1050°C–1100°C to ensure optimal toughness and corrosion resistance, and are individually subjected to ultrasonic testing (UT), hardness testing, PMI (positive material identification) spectral analysis, and dimensional tolerance inspection.
Our Products
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ASTM A276 Type 302 Round Bar Specifications
| Item | Details |
| Standard | ASTM A276 / A276M |
| Grade | Type 302 |
| UNS Designation | UNS S30200 |
| Condition | Condition A (Annealed) or Condition B (Cold Worked) |
| Shape | Round Bar |
Size Range & Dimensional Specifications
| Parameter | Metric | Imperial |
| Diameter Range | 3.0 mm – 450 mm | 1/8" – 18" |
| Standard Length | 3000 mm / 6000 mm | 10 ft / 20 ft |
| Length Tolerance | -0 / +50mm | -0 / +2 inch |
| Straightness | 1.5 mm / 1000 mm | 1/16" per 5 feet |
Dimensional Tolerances - Cold Finished & Hot Rolled
| Diameter | Cold Finished | Hot Rolled |
| d < 12.7 mm (1/2") | ± 0.05 mm | ± 0.20 mm |
| 12.7 ≤ d < 25.4 mm | ± 0.08 mm | ± 0.25 mm |
| 25.4 ≤ d < 50.8 mm | ± 0.10 mm | ± 0.30 mm |
| 50.8 ≤ d < 101.6 mm | ± 0.15 mm | ± 0.40 mm |
| d ≥ 101.6 mm (4") | ± 0.20 mm | ± 1.0% of Diameter |
Chemical Composition
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Nitrogen (N) |
| Value (%) | ≤ 0.15 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 17.0-19.0 | 8.0-10.0 | ≤ 0.10 |
Mechanical Properties
| Property | Value |
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 40 % |
| Reduction of Area | ≥ 50 % |
| Brinell Hardness | ≤ 201 HBW |
ASTM A276 Type 302 Stainless Steel Bar Applications:
Fasteners: Bolts, nuts, and screws.
Springs: High-strength corrosion-resistant springs.
Machined Parts: Shafts, valves, and pump components.
Architecture: Decorative trim and moldings.
Food & Dairy: Processing equipment.
Please let me know the following details if you require specific information:
The required shape and dimensions (diameter or thickness), as well as the intended application or operating environment.
I can assist you in determining appropriate tolerances or comparing Type 302 and Type 304 to see which better suits your needs.
Quality Inspection
ASTM A276 Type 302 Stainless Steel Round Bars are inspected according to applicable ASTM requirements to verify chemical composition, mechanical properties, dimensions, surface quality, and straightness. Each batch can undergo PMI/spectrochemical analysis, tensile testing, hardness testing, dimensional inspection, and visual examination. When required, ultrasonic testing can be performed to detect internal discontinuities. Test results are documented in an EN 10204 3.1 Material Test Certificate (MTC), providing traceability from raw material to finished bar.
GNEE Product Packaging
ASTM A276 Type 302 Stainless Steel Round Bars are carefully packaged to prevent scratches, deformation, moisture, and contamination during transportation. Bars are normally bundled with steel straps and separated with protective materials, then secured on strong wooden pallets or in wooden cases. Each bundle is clearly marked with grade, size, heat number, quantity, and order information. For export shipments, waterproof wrapping and reinforced packaging can be used to maintain surface condition during sea, truck, or container transportation.
FAQ
What is the main difference between Type 302 and Type 304?
The primary difference is the Carbon content. Type 302 has a higher carbon content (up to 0.15%) compared to Type 304 (max 0.08%).
Impact: This makes Type 302 slightly stronger and more prone to work-hardening. While 304 has slightly better corrosion resistance and is easier to weld, 302 is often chosen when higher strength and spring-like properties are required.
Is ASTM A276 302 stainless steel magnetic?
In the Annealed (Condition A) state, Type 302 is non-magnetic (austenitic structure). However, due to its chemical composition, it becomes magnetically attracted after cold working (such as cold drawing or machining) more significantly than Type 304.
Why is Type 302 often used for springs?
Due to its higher carbon content, Type 302 has a very high work-hardening rate. When cold-drawn into wire or small diameter bars, it achieves high tensile strength and excellent fatigue resistance, making it ideal for corrosion-resistant springs.
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