This website uses cookies to improve service quality. You will find more information about cookies on the privacy policy page.

AISI 304 (1.4301) Stainless Steel

What is AISI 304?

AISI 304 (1.4301) is a widely-used austenitic chromium-nickel stainless steel. It has excellent drawing properties and very good formability, while it is also highly corrosion-resistant. Typical uses of 304 stainless steel include sinks, kitchen equipment such as pans, tubing and much more.

Tap/faucet AISI 304 stainless steel

Chemical Composition

AISI 304 typically contains 17.5-19.5% Chromium, 8-10.5% Nickel, 2% Manganese, 1% Silicon, 0.11% Nitrogen, 0.07% Carbon, 0.05% Phosphorus and 0.03% Sulphur.

Table

Element

Weight

Iron

66.74 - 71.24% (Balance)

Chromium

17.5 - 19.5%

Nickel

8 - 10.5%

Manganese

2%

Silicon

1%

Nitrogen

0.11%

Carbon

0.07%

Phosphorus 

0.05%

Sulphur

0.03%

Equivalents and other designations

The following are all equivalents of AISI 304:

X5CrNi18-10, EN 1.4301, DIN 1.4301, UNS S30400, BS 304S15, BS 304S16, BS 304S31, BS EN58E

AISI 304 tubing

Properties

 

304

(Typical values at 20°C)

304 Annealed

(Typical values at 20°C)

Density

8 g/cm³

 

Elastic modulus

193 GPa

200 GPa

Hardness, Brinell

215 HB

 

Tensile strength

500-700 MPa

590 MPa

Yield strength

190 MPa

240 MPa

Elongation

40%

 

Coefficient of thermal expansion

1.72E-5 1/K

 

Thermal conductivity

16.2 W/(m·K)

 

Melting point

1450°C

 

Specific heat capacity

500 J/(kg·K)

 

Electrical resistivity

0.73 x 106 Ω·m

 

Corrosion resistance

AISI 304 is highly corrosion resistant to most oxidizing acids. However, corrosion can occur in environments containing chlorides. 304 stainless steel is not as corrosion-resistant as 316 stainless steel.

Machinability

AISI 304 has good machinability, however its low thermal conductivity means coolants and lubricants should be used liberally, especially on the cutting edges.

AISI 304 (1.4301) vs 316 (1.4401)

AISI 304 and 316 have similar values for hardness (Brinell), elastic modulus and tensile strength. AISI 316 has slightly higher yield strength at 200 MPa (vs. 190 MPa for 304), while AISI 304 has a slightly higher melting point (1450°C vs. 1400°C for 316). Due to the AISI 316 generally has better corrosion-resistance than 304.

Compare 304 and 316 stainless steel in more detail here:

304 vs. 316 stainless steel comparison

 

Equivalent materials

AISI 304 equivalents include X5CrNi18-10, EN 1.4301, DIN 1.4301, UNS S30400, BS 304S15, BS 304S16, BS 304S31, BS EN58E.