Stainless 304 (UNS S30400) is the most widely used 18-8 austenitic stainless with 18% chromium and 8% nickel. It offers good corrosion resistance, formability and weldability, making it the standard for food equipment, kitchenware, chemical vessels and architectural decoration.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Stainless Steel 304 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), flanges & pipe fittings (Class 150–2500, DN15–DN1200) — all with EN 10204 3.1 certified material test reports.
Stainless Steel 304 Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Fe (铁) | Balance | Si (硅) | ≤ 1.00 |
| Cr (铬) | 18.0–20.0 | C (碳) | ≤ 0.080 |
| Ni (镍) | 8.0–10.5 | P (磷) | ≤ 0.045 |
| Mn (锰) | ≤ 2.00 | S (硫) | ≤ 0.030 |
Stainless Steel 304 Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 515 MPa |
| Yield strength (Rp0.2) | ≥ 205 MPa |
| Elongation (A) | ≥ 40 % |
| Hardness | ≤ 201 HB |
| Density | 7.93 g/cm³ |
| Melting range | 1398–1454 °C |
| Thermal conductivity | 16.2 W/m·K |
| Young's modulus | 193 GPa |
| Max service temperature | 870 °C |
Key Advantages
- The 18-8 workhorse — most widely used austenitic grade
- Good formability and weldability
- Resists atmosphere, fresh water and food media
- More prone to pitting than 316 in chloride service
Relevant Standards
- ASTM A276
- ASTM A240
- ASTM A312
- ASTM A182
- UNS S30400
Typical Applications
- Food processing and kitchen equipment
- Architectural decoration and cladding
- Atmospheric chemical vessels and piping
- Drinking and domestic water systems
- Household appliances and tableware
Why Buy from Hangbo Alloy?
- Factory-direct manufacturer — founded 2012, headquartered in Shanghai Qingpu
- Full product range — bar, plate, sheet, strip, tube, forging, welding wire, flanges and machined parts
- Certified quality — ISO 9001:2015, GB/T 19001-2016, GJB 9001C-2017, EN 10204 3.1 mill test certificates with third-party inspection (SGS / BV / TUV) available on request
- Complete mill documentation — chemical analysis, mechanical test, ultrasonic test (UT), hardness and grain-size reports with every shipment
Contact Us — Shanghai Hangbo Alloy Group Co., Ltd.
Shanghai Hangbo Alloy Group Co., Ltd.
📍 No. 388 Songhuang Road, Qingpu District, Shanghai, China
📞 Tel / WhatsApp: +86 15618279078
✉️ Email: demi@nickel-alloy.com
🕒 Available 24 hours a day, 7 days a week — enquiries answered around the clock.
Send your drawing or enquiry (grade, form, size, quantity, standard) for a same-day quotation.
Frequently asked questions
What is the difference between 304 and 304L?
304L reduces carbon from ≤0.08% to ≤0.03%, so chromium carbides do not precipitate at grain boundaries during welding or high-temperature (450–850 °C) service. Intergranular corrosion resistance is markedly better than 304 and post-weld annealing is normally unnecessary. Strength is slightly lower but ductility and toughness are higher. Prefer 304L for pressure equipment and welded structures.
What forms and sizes are available?
We supply Stainless Steel 304 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), flanges & pipe fittings (Class 150–2500, DN15–DN1200). Custom lengths, tolerances and machining to drawing are available on request.
What is the MOQ and lead time?
MOQ is flexible — trial orders from a single piece are welcome. Stock sizes ship in 3–7 days; custom forgings and machined parts typically 15–35 days depending on quantity and process.
Can you provide third-party inspection and shipping to my port?
Yes. SGS / BV / TUV or your nominated inspector can witness all tests before shipment. Full export documentation is provided, and we ship worldwide by sea or air on FOB, CIF or DDP terms.