ASTM A240 309S stainless steel is a kind of austenitic stainless steel, which is mainly used in high temperature environment. Its high chromium content and nickel content guarantee good corrosion resistance and oxidation resistance. Compared with 304 stainless steel, ASTM A240 309S stainless steel has higher strength at room temperature.
ASTM A240 309S chemical composition
|
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
N |
|
A240 309S |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
22.0-24.0 |
12.0-15.0 |
2.00-3.00 |
0.10 |
ASTM A240 309S mechanical properties
|
Grade |
Tensile strength, min Mpa |
Yield strength, min Mpa |
Elongation in 2 in % |
Hardness, max |
|
Brinell |
Rockwell B |
|
A240 309S |
515 |
205 |
40 |
217 |
95 |
ASTM A240 309S stainless steel has good high temperature strength, creep resistance and environmental corrosion resistance. Therefore, ASTM A240 309S stainless steel widely used in the furnace parts of heat treatment industry, such as conveyor belts, drums, furnace heads, fire-resistant pads, hangers and so on. ASTM A240 309S stainless steel is also used in chemical processing industries to carry hot concentrated acids, ammonia water and disulfides. In the food processing industry, ASTM A240 309S stainless steel is used for the contact with thermoacetic acid and citric acid.
