304 Supplier | Bar, Tube, Plate - Hangbo Alloy
Date: 2026年1月29日 Categories: Stainless Steel Views: 368
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of 304 stainless steel (UNS S30400 / EN 1.4301 / GB 06Cr19Ni10) round bars, plates, sheets, strips, seamless and welded tubes, pipes, forgings and wire. As the most widely used austenitic "18/8" stainless steel, 304 offers an unmatched combination of corrosion resistance, formability, weldability and cost-effectiveness — the default choice for food processing, chemical storage, cryogenic and general industrial service.
Standards
- ASTM A240 / A240M — Plate, Sheet, Strip
- ASTM A276 — Bar, Rod, Shapes
- ASTM A312 / A213 — Seamless & Welded Pipe / Tube
- ASTM A182 / A182M — Forgings & Flanges
- ASME SA240 / SA276 / SA312
- UNS S30400 / EN 1.4301 / DIN X5CrNi18-10 / GB 06Cr19Ni10
Precise ASTM Chemical Composition (%)
| Element | Range / Max |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 0.75 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
Physical & Mechanical Properties
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength (Annealed, ASTM A240) | 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) |
| Elongation (in 2") | 40% |
| Hardness | ≤ 201 HB / ≤ 92 HRB |
| Density | 7.93 g/cm³ |
| Melting Range | 1400 – 1450 °C |
| PREN (Pitting Resistance Equivalent) | ≈ 19 |
| Service Temperature | –196 °C to 870 °C (intermittent) |
Depth Characteristics
- All-Round Corrosion Resistance: Superior resistance to atmospheric corrosion, fresh water, foodstuffs, organic acids and mild chemical media.
- Outstanding Formability: Excellent deep-drawing, bending and spinning characteristics for complex fabricated parts.
- Cryogenic Toughness: Retains high impact toughness down to –196°C, ideal for LNG and cryogenic equipment.
- Excellent Weldability: Weldable by all standard processes; low-carbon 304L variants prevent sensitization in heavy sections.
- Cost-Effective Workhorse: The best value-to-performance ratio in the austenitic family with a vast global supply base.
Manufacturing Process — Melting & Rolling
304 is melted in EAF (electric arc furnace) and refined by AOD (Argon Oxygen Decarburization) to precisely control carbon and nitrogen. Slabs are continuously cast, hot-rolled, then solution annealed at 1010–1120°C and rapidly water quenched to keep the fully austenitic, carbide-free structure. Coils and plates are pickled and passivated for a clean corrosion-resistant surface; bars are annealed, peeled and straightened with tight dimensional control.
Testing & Inspection Methods — 100% PMI / UT
- PMI (Positive Material Identification): 100% XRF verification of Cr, Ni and Mo on every heat before dispatch.
- UT (Ultrasonic Testing): Full-length ultrasonic examination of bar per ASTM A388/E2375 where specified.
- Mechanical & Chemical: Tensile and hardness per ASTM A370/A240; chemical analysis per ASTM E353 with EN 10204 3.1 certificates.
- Plus: intergranular corrosion test (ASTM A262) on request, hydrostatic testing of pipe, and 100% dimensional inspection.
High-Frequency Application Scenarios
- Food & Beverage: Tanks, piping and processing equipment for dairy, brewing, edible oil and meat plants.
- Chemical Storage: Tanks and vessels for organic acids, alcohols and mild chemicals.
- Heat Exchangers: Tube bundles and shells for general process heating and cooling.
- Cryogenic Industry: LNG tanks, piping and valves operating down to –196°C.
- Architecture & Sanitary: Cladding, railings, kitchen equipment and hospital fixtures.
6+ Professional FAQs
1. What is the difference between 304 and 304L?
Carbon content: 0.08% max for 304 vs 0.03% max for 304L. 304L avoids chromium-carbide precipitation (sensitization) during welding of heavy sections.
2. Is 304 stainless steel magnetic?
In the annealed condition it is essentially non-magnetic; slight magnetism may develop after heavy cold working.
3. What is the maximum service temperature of 304?
About 870°C for intermittent service; for continuous service above 425°C, consider stabilized grades (321) or low-carbon (304L) to avoid sensitization.
4. How does 304 compare with 316?
316 adds 2–3% molybdenum, giving significantly better resistance to chlorides, pitting and marine environments. Choose 316 for coastal or chloride service.
5. Is 304 food-grade?
Yes — 304 ("18/8") is the standard stainless grade for food contact and hygienic applications worldwide.
6. Which product forms are available?
Round bar, plate, sheet, strip, seamless and welded tube/pipe, forgings, flanges and wire — with EN 10204 3.1 certificates and full traceability.
Supply List
- Round Bar: Φ6mm – Φ500mm, peeled / ground
- Plate / Sheet: Thickness 0.3mm – 120mm, cut-to-size
- Seamless Tube: OD 6mm – 219mm
- Welded Pipe: OD 19mm – 1016mm
- Forgings / Flanges: Custom per drawings
- Wire: Φ0.05mm – 12mm
Need certified 304 stainless steel for your project? Contact Shanghai Hangbo Alloy Group for instant quotations, stock availability and mill certificates — quick response within 10 minutes. Email: sales@hangboalloy.com / Tel: +86 13611656360.
