ASTM A240 309/ UNS S30900 Stainless Steel 2B Surface Cold Rolled Sheet
Stainless steel ASTM A240 309/ UNS S30900 sheet is available in 2B, 2D, Bright Annealed(BA), mirror, 8K or polished surface finish. ASTM A240 309 stainless steel cold rolled sheet is mainly used for pressure vessel application or any other fields.
Type 309/ UNS S30900 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. ASTM A240 309/ UNS S30900 stainless steel 2B surface cold rolled sheet is non-magnetic in the annealed and cold worked conditions and is as resistant to corrosion as Type 304/304L.
309/ UNS S30900 Stainless Steel 2B Surface Cold Rolled Sheet Mechanical Properties:
Yield Strength, min. (ksi): 30
Tensile Strength, min. (ksi): 75
Elongation, min. (%): 40
Hardness, max. (Rb): 95
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
309/ UNS S30900 Stainless Steel Cold Rolled Sheet Chemical Requirements(by weigth %):
Carbon: 0.20 max.
Chromium: 22.0-24.0
Nickel: 12.0-15.0
Manganese: 2.00 max.
Silicon: 0.75 max.
Phosphorus: 0.045 max.
Sulfur: 0.030 max.
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