304 Stainless Steel
304 is an 18% chromium, 8% nickel austenitic stainless steel with EN designation 1.4301, ASTM type 304, and UNS S30400. This page states the composition figures, EN 10088-2 mechanical property limits by product form, and physical properties, and notes that cross-reference tables are comparisons only, not direct equivalents. It closes with the 304 coil that ZIVO STEEL supplies.
- Designation
- 304
- Family
- Austenitic stainless
EN 1.4301
EN steel number
S30400
UNS number
18% Cr
Chromium, nominal
8% Ni
Nickel, nominal
Representative view: close-up of a 304 stainless steel sheet corner with a clean cut edge.
What 304 Stainless Steel Is
304 is an 18% chromium, 8% nickel austenitic stainless steel. It is an all-purpose grade with good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability.
Designations & Standards
304 has EN designation 1.4301, ASTM type 304, and UNS S30400. The BSSA grades table lists 304-related designations in the same row; these cross-reference tables are comparisons only and cannot be assumed to be direct equivalent grades.
| System | Designation | Standard | Note |
|---|---|---|---|
| EN | 1.4301 | EN 10088 | Listed in BSSA grades table |
| ASTM | 304 | Core type designation | |
| UNS | S30400 | Core UNS designation | |
| BS (wrought) | 304S31 | BS | Listed in BSSA grades table |
| En | 58E | En | Listed in BSSA grades table |
| German name | X5CrNi18-10 | Listed in BSSA grades table | |
| SS | 2333 | SS | Listed in BSSA grades table |
| EN (cast) | 1.4308 | EN 10283 | Listed in same row as 1.4301 |
| BS (cast) | 304C15 | BS | Listed in same row as 1.4301 |
Composition
The composition figures below for 304 (1.4301) and 304L (1.4307) are typical or representative values, not specification limits. Outokumpu typical values and BSSA composition guide entries are listed separately.
| Source | Designation | C (% by mass) | Cr (% by mass) | Ni (% by mass) |
|---|---|---|---|---|
| Outokumpu typical composition | Core 304/4301 | 0.04 | 18.1 | 8.1 |
| Outokumpu typical composition | Core 304L/4307 | 0.02 | 18.1 | 8.1 |
| BSSA composition guide | 1.4301 | 0.07x | 18 | 8 |
| BSSA composition guide | 1.4307 | 0.030x | 18 | 8 |
In the BSSA composition guide, x indicates a maximum. The BSSA Composition Guide is intended to represent the composition only; it does not show the specified or typical compositions of commercially available steels. Its figures are representative of the grade, not typical. The Outokumpu figures are typical composition values, not specified limits.
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Mechanical Property Limits by Product Form
Listed values are EN 10088-2 limits as tabulated by Outokumpu.
| Grade | Product form | Rp0.2 min (MPa) | Rp1.0 min (MPa) | Rm (MPa) | Elongation A80 min (%) |
|---|---|---|---|---|---|
| 304 | Cold rolled coil and sheet | 230 | 260 | 540–750 | 45 |
| 304 | Hot rolled coil and sheet | 210 | 250 | 520–720 | 45 |
| 304 | Quarto plate | 210 | 250 | 520–720 | 45 |
| 304L | Cold rolled coil and sheet | 220 | 250 | 520–700 | 45 |
| 304L | Hot rolled coil and sheet | 200 | 240 | 520–700 | 45 |
| 304L | Quarto plate | 200 | 240 | 500–700 | 45 |
Physical Properties
EN 10088-1 gives these physical properties for 304. 304 is not magnetizable.
7.9 kg/dm³
Density
200 GPa
Modulus of elasticity
16.0 × 10⁻⁶/K
Thermal expansion, 20–100 °C
15 W/(m·K)
Thermal conductivity
500 J/(kg·K)
Thermal capacity
0.73 Ω·mm²/m
Electrical resistivity
304 vs 304L
304L is a low-carbon alternative to 304; the lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion. 304L is suitable for a wide variety of applications that require good formability and weldability.
Designations of 304L listed together in the BSSA grades table (cross-references, not equivalents):
| System | Designation | Standard |
|---|---|---|
| EN | 1.4307 | EN 10088 |
| ASTM | 304L | ASTM |
| UNS | S30403 | UNS |
| AISI | 304L | AISI |
| BS (wrought) | 304S11 | BS |
| SS | 2352 | SS |
| BS (cast) | 304C12 | BS |
304 Coil From ZIVO
ZIVO STEEL supplies 304 coil in the finishes and sizes below. The 304 Stainless Steel Coil page covers the quote basis and traceability.
| Product page | Grade | Finish | Thickness | Width |
|---|---|---|---|---|
| 304 Stainless Steel Coil | 304 | 2B | 0.3–3.0 mm | 1219 / 1500 mm |
| 304 Stainless Steel Coil | 304 | BA | 0.3–2.0 mm | 1219 mm |
| 304 Stainless Steel Coil | 304 | No.1 | 3.0–6.0 mm | 1219 / 1250 / 1500 mm |
| 304 Stainless Steel Coil | 304 | No.4 | 0.3–3.0 mm | 1219 / 1500 mm |
| 304 Stainless Steel Coil | 304 | HL | 0.3–3.0 mm | 1219 / 1250 / 1500 mm |
| 304 Stainless Steel Coil | 304 | 8K | 0.26–2.5 mm | 1000 / 1219 / 1250 mm |
| 304 Stainless Steel Coil | 304 | 2D | — | — |
Frequently Asked Questions
No single specified composition is given on this page. Outokumpu lists the typical composition of Core 304/4301 as C 0.04, Cr 18.1, Ni 8.1 by mass; the BSSA Composition Guide gives representative figures of C 0.07x maximum, Cr 18, Ni 8. Composition Guide figures are representative of the grade, not typical, and the guide is intended to represent composition only.
ZIVO supplies grade 304 stainless steel coil in multiple conditions: cold rolled 2B, 2D, 8K, BA, HL, and No.4 finishes, hot rolled No.1 finish, and 304 DDQ cold rolled 2B finish. Dimensions and coil weights vary by finish; for example, 2B is 0.3–3.0 mm thick, 1219 or 1500 mm wide, with coil ID 508 or 610 mm and coil weight 3–10 t.
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