Type 309 (UNS S30900) Stainless Steel

Type 309 (UNS S30900) Stainless Steel

Type 309 (UNS S30900) Stainless Steel Description Type 309 is a high temperature chromium nickel austenitic stainless steel that resists oxidation at temperatures up to 1900˚F in dry air at constant temperature. Under thermal cycling conditions this grade resists oxidation up to a temperature of...
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Product Details

Type 309 (UNS S30900) Stainless Steel

Description

Type 309 is a high temperature chromium nickel austenitic stainless steel that resists oxidation at temperatures up to 1900˚F in dry air at constant temperature. Under thermal cycling conditions this grade resists oxidation up to a temperature of approximately 1850˚F. Type 309 has good sulfidation resistance but low resistance to carburization and should not be used in highly carburizing atmospheres. Type 309 is non-magnetic in the annealed and cold worked conditions and is as resistant to corrosion as Type 304/304L.


Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A167*

Element

309

Carbon

0.20

Chromium

22.0-24.0

Nickel

12.0-15.0

Manganese

2.00

Silicon

0.75

Phosphorus

0.045

Sulfur

0.030

* Maximum, unless range is indicated


Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A167.

Property

309

Yield Strength, min. (ksi)

30

Tensile Strength, min. (ksi)

75

Elongation, min. (%)

40

Hardness, max. (Rb)

95


Physical Properties
Physical properties for Type 309 stainless steel

Property

309

Density, lb/in3

0.285

Modulus of Elasticity, psi

29.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

8.7 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

9.0

Specific Heat, Btu/lb ˚F

0.12

Electrical Resistivity, Microohm-in

30.7


Standards
Typical standards for Type 309 stainless steel

Property

309

Density, lb/in3

0.285

Modulus of Elasticity, psi

29.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

8.7 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

9.0

Specific Heat, Btu/lb ˚F

0.12

Electrical Resistivity, Microohm-in

30.7


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