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ASTM A240 Grade 321(S32100) Stainless Steel Additional Properties
Type 321 is an austenitic chromium-nickel stainless steel containing Titanium. Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
Chemistry Typical of ASTM A240 Grade 321
Carbon: 0.08 max
Manganese: 2.00 max
Silicon: 0.75 max
Chromium: 17.00-19.00
Nickel: 9.00-12.00
Molybdenum: 0.75 max
Phosphorus: 0.045 max
Sulfur: .030 max
Copper: 0.75 max
Nitrogen: .010 max
Titanium: 5x (Carbon + Nitrogen) min-0.70 max
Iron: Balance
Mechanical properties of 321 grade stainless steel
Grade |
Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness |
|
|
Rockwell B (HR B) max |
Brinell (HB) max |
||||
|
321 |
515 |
205 |
40 |
95 |
217 |
|
321H |
515 |
205 |
40 |
95 |
217 |
|
347 |
515 |
205 |
40 |
92 |
201 |
Possible alternative grades to 321 grade stainless steel
Grade |
Why it might be chosen instead of 321 |
|
304L |
The requirement is for resistance to intergranular corrosion, not for high temperature strength |
|
3CR12 |
Only mild "high temperature" environment is present… up to about 600°C. |
|
304H |
Only mild "high temperature" environment is present… up to about 800°C. |
|
310 |
The temperature of the operating environment is up to about 1100°C - too high for 321 or 321H. |
|
S30815 |
The temperature of the operating environment is up to about 1150°C- too high for 321 or 321H. |
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