CHEMICAL COMPOSITION OF SS 309 / 309S SHEETS & PLATES
309 stainless steel is an austenitic stainless steel that machines comparably to 304. However, 309 has superior corrosion resistance and strength. Cold working 309 will increase both strength and hardness and this stainless steel does not respond to heat treating.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 309 | 0.20 max | 2 max | 1 max | 0.045 max | 0.030 max | 18.0 – 23 | – | 8.0 -14 | – |
| SS 309S | <=0.080 max | <=2.00 max | <=0.75 max | <=0.040 max | <=0.015 max | 22.00-24.00 max | – | 12.00-14.00 | – |
Grade | Mechanical Property | ||||
Yield | Tensile | Elongation | Hardness, max | ||
ASTM A240 309S | Min Mpa | Mpa | Min % | Brinell | Rockwell B |
Features
Ease of Fabrication
Good Sulfidation Resistance
Good Weldability
Moderate Strength at High Temperature
Oxidation Resistant to 1900°F
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