302 Stainless Steel Specifications: Sheet, Bar, Rod
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What is 302 Stainless Steel ?
302 stainless steel is an austenitic chromium-nickel stainless steel with a composition very similar to 304, but with a slightly higher carbon content. It typically contains 17–19% chromium, 8–10% nickel, and up to 0.15% carbon, which gives it improved strength and hardness compared to 304, especially after cold working. 302 stainless steel offers excellent corrosion resistance, good formability, and high tensile strength, making it suitable for applications like springs, wire products, fasteners, and medical instruments.
302 Stainless Steel Specifications
ASTM A240/A240M, Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
ASTM A480/A480M, Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
ASTM A666, Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
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302 Stainless Steel Composition
| Element | Percent |
|---|---|
| Carbon | 0.15 |
| Chromium | 17.0-19.0 |
| Nickel | 8.0-10.0 |
| Manganese | 2.00 |
| Silicon | 0.75 |
| Nitrogen | 0.10 |
| Phosphorus | 0.045 |
| Sulfur | 0.030 |
302 Stainless Steel Mechanical Properties
| Mechanical Property | Value |
|---|---|
| Yield Strength, min. (Mpa) | 205 |
| Tensile Strength, min. (Mpa) | 515 |
| Elongation, min. (%) | 40 |
| Hardness, max. (Rb) | 92 |
302 Stainless Steel Physical Properties
| Physical Properties | Value |
|---|---|
| Density, lb/in3 | 0.29 |
| Modulus of Elasticity, psi | 29.0 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 9.2 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 9.4 |
| Specific Heat, Btu/lb ˚F | 0.12 |
| Electrical Resistivity, Microohm-in | 27.4 |
What is the difference between 302 and 316 stainless steel?
Type 316 stainless steel generally offers superior corrosion resistance, especially in chloride-rich environments, compared to Type 302. This is due to the addition of molybdenum in 316, which enhances its resistance to pitting and crevice corrosion. While both are austenitic stainless steels and non-magnetic in their annealed state, they can become slightly magnetic when cold-worked. 316 is often favored in marine and chemical applications due to its enhanced corrosion protection.
Is SS 302 magnetic?
Type 302 is non-magnetic in the annealed condition but becomes magnetic as a result of cold working.
Can you harden 302 stainless steel?
Hardening Type 302 can only be hardened by cold working. Annealing: Heating at 1850-2050°F and rapid cooling. Light gauges (up to 16 gauge) can be air-cooled. Heavier gauges require a water quench from the annealing temperature.
What is the difference between SS 302 and 303 stainless steel?
302 and 303 stainless steel both have excellent mechanical properties. They are both strong, durable, and easy to work with. However, 303 stainless steel is slightly tougher than 302 stainless steel, making it the better choice for applications where high strength is required.
