Type 309S Stainless Steelis identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially nonmagnetic as annealed and become lightly magnetic when cold worked.
ASTM A240 309S Chemical Composition
Grade
|
The Element Max (%)
| ||||||
C
|
Mn
|
P
|
S
|
Si
|
Cr
|
Ni
| |
ASTM A240 30908
|
0.08
|
2.00
|
0.045
|
0.030
|
0.75
|
22.0-24.0
|
12.0-15.0
|
Mo
|
N
|
Cu
| |||||
Mechanical Property of ASTM A240 309S
Grade
|
ASTM A240 309S Mechanical Property
| ||||
Yield
|
Tensile
|
Elongation
|
Hardness, max
| ||
ASTM A240 30908
|
Min Mpa
|
Mpa
|
Min %
|
Brinell
|
Rockwell B
|
205
|
515
|
40%
|
217
|
95
| |
ASTM A240 S30908 Stainless Steel Application
1,Machinery and Hardware Industries
2, Construction field, shipping building industry
3: Food and Mechanical Industries
4: Boiler Heat Exchange
2, Construction field, shipping building industry
3: Food and Mechanical Industries
4: Boiler Heat Exchange
ASTM A240 309S Processing:
Type309S Stainless Steel are not harden by heat treatment. Anneal at 1900 - 2050°F (1038 - 1121°C), then water quench or rapidly air cool.
ASTM A240 309S Forming:
Types 309 and 309S Stainless Steels can be roll formed, stamped and drawn readily. In-process annealing is usually required to reduce hardness and increase ductility.
Type 309 is generally considered to have weldability nearly equivalent to the most common alloys of this class, Types 304 and 304L.
Types 309 and 309S provide excellent general corrosion resistance. They are more resistant to marine atmospheres than Type 304. They exhibit high resistance to sulfite liquors and are useful for handling nitric acid, nitric-sulfuric acid mixtures.
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