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304 / 304L 1.4307
Technical Data
304 is the most common 18/8 austenitic stainless steel, very widely used in the food, pharmaceutical, breweries and chemical industries. 304 stainless is very popular in the building and domestic appliance sectors. The 304L grade has a reduced carbon content. The lower carbon content will help improve corrosion resistance after welding, and minimise carbide precipitation during the welding operation. As a stainless steel 304 has very good welding characteristics. Though continuous use of 304 stainless as high temperature is not recommended occasional service of 304 stainless up to 870ºC will give good oxidation resistance.
Typical Analysis
304
C.
Mn.
P.
S.
Si.
Cr.
Ni.
0.08%
2.00%
0.045%
0.03%
1.00%
18.00-
8.00-
max.
max.
max.
min.
max.
20.00%
10.50%
304L grade limits carbon to 0.03% and increased nickel to 12%
Physical Properties 304
Temperature
20ºC
200ºC
400ºC
800ºC
Modulus of elasticity
20000
18500
17000
13500
kg/mm
Specific heat
0.105
0.125
0.135
0.15
kcal/ºC
Specific electrical resistance
0.7
0.8
1.0
1.15
(resistivity)
Mean value for:
20-100ºC
20-200ºC
20-400ºC
20-800ºC
Coefficient of Thermal Expansion
17
17.5
18
19.5
x10-6 per ºC
Density g/cm3 at 20ºC
7.9
Scaling temperature ºC
875ºC