The 304 stainless steel round bar, produced to ASTM A276 / GB standards, is the solid-section counterpart to stainless steel round tube in the same 304 grade — select bar for solid structural members and round tube for hollow, weight-sensitive, or flow-carrying applications.
| Element | Content (%) |
|---|---|
| C | ≤0.08 |
| Cr | 18.0–20.0 |
| Ni | 8.0–10.5 |
| Mn | ≤2.0 |
| Si | ≤1.0 |
| P | ≤0.045 |
| S | ≤0.030 |
Physical Properties
Density: 7.93 g/cm³
Melting Point: 1398–1454°C
Thermal Conductivity: 16 W/(m·K) at 20°C
Thermal Expansion Coefficient: 17.3×10⁻⁶/°C (0–100°C)
Magnetism: Non-magnetic (may become slightly magnetic after cold working)
Chemical Properties
Acid Resistance: Corrosion rate ≤0.1 mm/year in 5% H₂SO₄ at 25°C; excellent resistance to nitric acid ≤30% concentration.
Alkali Resistance: Stable in 10% NaOH at 25°C, with no significant corrosion.
Intergranular Corrosion: No cracking observed in ASTM A262 E test, meeting intergranular corrosion resistance requirements.
Diameter Range & Tolerance
5–10mm: ±0.05mm
10–50mm: ±0.1mm
50–200mm: ±0.2mm
Length
Standard 6m/bar, customizable cut-to-length (tolerance ±5mm), minimum order 1 bar
Surface Finish
Black (Hot-Rolled): Suitable for rough machining and further processing
Bright (Cold-Drawn): Ra ≤1.6μm, suitable for high surface precision components
Supply Condition
Annealed
Use the table below to estimate bar weight before requesting a quote. Formula: W (kg/m) = D² × 0.00623, based on 304 SS density 7.93 g/cm³.
| Diameter (mm) | Weight per Meter (kg/m) | Typical Application |
|---|---|---|
| 10 | 0.62 | Fasteners, small hinges |
| 16 | 1.60 | Food equipment shafts |
| 20 | 2.49 | Structural connectors |
| 25 | 3.89 | Architectural fittings |
| 32 | 6.38 | Food pipeline supports |
| 40 | 9.97 | Mid-duty machine shafts |
| 50 | 15.58 | Gear shafts, rollers |
| 60 | 22.43 | Revolving door shafts |
| 80 | 39.87 | Heavy structural bars |
| 100 | 62.30 | Industrial drive shafts |
Diameter tolerance per ASTM A276: ±0.1 mm (10–50 mm), ±0.2 mm (50–200 mm). For non-standard diameters or custom lengths, use the pricing calculator below.
Stainless Steel Bar Inventory Racking System
Spectrometer for Alloy Composition Analysis
Finished Stainless Steel Bars on Storage Racks
Palletized Stainless Steel Bars on Workshop Floor
Secured Stainless Steel Bar Bundles for Shipment
Forklift Loading Bundled Stainless Steel Bars into Freight Truck
Diameter Selection: Φ20–Φ100mm
Key Advantages: Tensile strength ≥520MPa, wear-resistant
Typical Case: Motor shafts (Φ45mm), gear shafts used in machinery manufacturing workshops.
Diameter Selection: Φ8–Φ50mm
Key Advantages: Non-magnetic, FDA compliant
Typical Case: Milk pipeline (Φ32mm), food mixer shafts used in pharmaceutical and food production areas.
Diameter Selection: Φ10–Φ80mm
Key Advantages: Surface Ra ≤1.6μm, corrosion-resistant
Typical Case: Hotel revolving door shafts (Φ60mm), curtain wall connectors used in architectural facades.
Diameter Selection: Φ5–Φ30mm
Key Advantages: Machining precision ±0.05mm, easy cutting
Typical Case: High-strength bolts (Φ12mm), furniture hinge shafts used in hardware processing facilities.
Use carbide tools for cutting, cutting speed 80–120 m/min, feed rate 0.1–0.3 mm/rev, with coolant to avoid work hardening.
Clean surface oils before welding; recommended TIG welding at 100–150A. No post-weld heat treatment required.
Standard diameters (Φ10–Φ100mm) in stock; diameters above 200mm are customizable. Lead time: 7–15 days.
Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.
