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You are here: Home- NewsASTM A240 Grade 321(S32100) Stainless Steel Additional Properties

ASTM A240 Grade 321(S32100) Stainless Steel Additional Properties

Posted:2017/2/7 3:29:10

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
(253MA)

The temperature of the operating environment is up to about 1150°C- too high for 321 or 321H.

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