305 Stainless Steel
Type 305 Stainless Steel is an austenitic chromium nickel stainless steel that can be cold worked and deep drawn more readably than Type 302 and Type 304 due to an increased nickel content that decreases the work hardening rate of the material. It is nonmagnetic and cannot be hardened by thermal treatment.
ASTM A240, AMS 5514
Deep drawn or spun components, eyelets, electronic enclosure applications
Chemical Composition: (ASTM A240)
|Chromium||17.0 – 19.0|
|Nickel||10.5 – 13.0|
Mechanical Properties: (ASTM A240)
|Type||Yield Strength 0.2% offset (KSI)||Tensile Strength (KSI)||% Elongation (2" Gauge length)||Hardness Rockwell|
|305 Ann||30 min.||70 min.||40 min.||HRB 88 max.|
|Density (lb./ in^2) @ RT||0.29|
|Modulus of Elasticity in Tension (psi x 10^6)||28.0|
|Specific Heat (BTU/o F/lb.)||32 to 212 oF||0.12|
|Thermal Conductivity (BTU/hr/ft^2/ft)||212oF||9.4|
|Mean Coefficient of Thermal Expansion (in. x 10^-6 per o F)||32 to 212oF||9.6|
|32 to 600oF||9.9|
|32 to 1,000oF||10.2|
|32 to 1,200oF||10.4|
|Electrical Resistivity (micro ohms - cm)||at 70oF||28.4|
|Melting Point Range (oF)||2550 - 3650|
|Oxidation Resistance - Continuous Service(oF)||1650|
|Oxidation Resistance - Intermittent Service(oF)||1500|
Type 305 is not hardenable by heat treatment. Anneal at 1850 - 2050°F (1010 - 1121°C), then water quench or rapid air cool.
Type 305 Stainless Steel is more readily formed, deep drawn and spun than Types 302 and 304 due to its lower work hardening rate.
This particular alloy is generally considered to have comparable weldability to Types 304 and 304L, but autogenous arc welding sometimes causes hot cracking. Annealing after welding will be needed to offset any chromium carbide precipitation which might occur. When a filler is needed, AWS E/ER 308 is most often specified.
Type 305 is similar to Type 304 with respect to corrosion resistance. It offers good protection from a wide variety of solutions used in the chemical, textile, petroleum, dairy and food industries.