Description
Global Standards & Certifications
| Region | Standard | Designation |
|---|
| USA | ASTM A276/A479 | UNS S30400 |
| Europe | EN 1.4301 | X5CrNi18-10 |
| China | GB/T 1220 | 06Cr19Ni10 |
| Japan | JIS SUS 304 | - |
| India | IS 6601 | SS304 |
Chemical Composition (Weight %)
| Element | Content | Role |
|---|
| Carbon (C) | ≤0.08% | Balances strength & weldability |
| Chromium (Cr) | 18.0–20.0% | Enhances oxidation resistance |
| Nickel (Ni) | 8.0–10.5% | Stabilizes austenitic structure |
| Manganese (Mn) | ≤2.0% | Improves hot workability |
| Silicon (Si) | ≤0.75% | High-temperature strength |
| Phosphorus (P) | ≤0.045% | - |
| Sulfur (S) | ≤0.03% | - |
| Iron (Fe) | Balance | Base metal |
Mechanical & Physical Properties
Mechanical (ASTM A276)
Tensile Strength: 515–720 MPa
Yield Strength (0.2% Offset): ≥205 MPa
Elongation at Break: ≥40%
Hardness: ≤90 HRB (Annealed)
Modulus of Elasticity: 193 GPa
Physical
Density: 8.0 g/cm³
Melting Point: 1.400–1.450°C
Thermal Conductivity: 16.2 W/m·K (at 100°C)
Electrical Resistivity: 0.72 μΩ·m
Top 4 Industrial Advantages
Corrosion Resistance: Resists oxidation, acids, and chloride exposure (e.g., coastal or chemical environments).
Machinability & Weldability: Performs well with standard fabrication techniques; no post-weld annealing required.
Temperature Tolerance: Operates reliably from -196°C (cryogenic) to 870°C (intermittent heat).
Aesthetic Versatility: Polishes to mirror finishes for architectural or sanitary applications.
Key Applications
| Industry | Typical Uses |
|---|
| Construction | Bolts, shafts, structural supports, bridges |
| Food & Beverage | Processing equipment, tanks, conveyor systems |
| Automotive | Exhaust systems, fasteners, engine components |
| Pharmaceuticals | Hygienic piping, reactor vessels |
| Energy | Heat exchangers, turbine parts |
FAQs for Engineers & Buyers
Q1: How does 304 differ from 304L round bars?
A: 304 has a higher carbon content (≤0.08% vs. 304L’s ≤0.03%), making 304L preferable for heavy welding. 304 offers better strength for non-welded applications.
Q2: Can 304 round bars be used in marine environments?
A: Suitable for short-term exposure; for prolonged saltwater contact, consider 316/L grades.
Q3: Is 304 stainless steel magnetic?
A: Non-magnetic in annealed state; slight magnetism may occur after cold working.
Why Partner With Us?
Full Traceability: Mill Test Certificates (EN 10204 3.1) with chemical/mechanical data.
Custom Solutions: Diameters 3mm–300mm, lengths up to 6m (±0.1mm tolerance).
Fast Turnaround: 15–25 days global delivery (FOB, CIF, DDP terms available).
Sustainability: 70% recycled content, ISO 14001-certified production.
Keywords: 304 Stainless Steel Round Bar Supplier, Austenitic Alloy, ASTM S30400. Corrosion-Resistant Steel, Machinable Stainless Steel
