316 Stainless Steel

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EN 1.4401 grade 316 stainless steel (16% chromium, 10% nickel and 2% molybdenum) is the second most important austenitic Stainless Steel compared to 304.

316 added molybdenum and higher nickel content gives it greater corrosion resistance in many aggressive environments compared to 304.

EN 1.4401 has increased strength and greater creep resistance at higher temperatures compared to 304 and also retains excellent mechanical and corrosion properties at temperatures below 0°C (32°F)

Corrosion and Oxidisation Resistance of 1.4401

316 Stainless Steel shows excellent corrosion and oxidisation resistance in a range of atmospheric environments and many corrosive substances and is generally provides more resistant than 304.

316 is vulnerable to stress corrosion cracking above about 60°C (140°F) and to pitting and crevice corrosion in warm chloride environments.

It is resistant to potable water containing up to approximately 1000mg/L chlorides at room temperature 20°C (68°F) to 25°C (77°F), this reduces to about 500mg/L at around 60°C (140°F).

Chemical Composition of 1.4401

°

C

Mn

Si

P

S

Cr

Mo

Ni

N

Min

 

 

 

 

 

16.0

2.0

10.0

 

Max

0.08

2.0

0.75

0.045

0.03

18.0

3.0

14.0

0.10

 

Welding

1.4401 Stainless Steel provides excellent welding with and without filler metals using standard fusion methods. Heavy welded sections require post-weld annealing for optimal corrosion resistance.

For optimal annealing heat to 1010-1120°C (1850-2048°F) and cool rapidly with air or water.

EN 1.4401 316 Stainless Steel cannot be hardened by thermal treatment.

Mechanical Properties of 1.4401

Yield Strength

0.2% (MPa) min

Tensile strength

(MPa) min

Elongation (% in 50mm) min

Rockwell B (HR B) max

Brinell (HB) max

205

515

40

95

217

 

Physical Properties of 1.4401

Density

(kg/ m cube)

Elastic Modulus

(GPa)

Specific heat

0-100°C (J/kg.K)

Electrical resistivity

(nΩ.m)

8000

193

500

740

Mean Coefficient of Thermal Expansion (μm/m/°C)

0-100°C

0-315°C

0-538°C

15.9

16.2

17.5

Thermal Conductivity (W/m.K)

at 100°C

at 500°C

16.3

21.5

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