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304 / 304L
Product Information
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304 is the original "18-8" stainless. It is produced in greater quantity than any other austenitic stainless steel. 304 provides useful resistance to corrosion in many environments ranging from moderately reducing to moderately oxidizing. Through the controlled addition of nitrogen, it is common for 304L to meet the mechanical properties of 304 straight grade. As a result, most products are dual certified as 304 and 304/304L.
Common Trade Names
304 Stainless, 304L Stainless
Inventory
304 / 304L Plate, 304 / 304L Sheet, 304 / 304L Coil, 304 / 304L Round Bar, 304 / 304L Hex Bar, 304 / 304L Welding Products, 304 / 304L Pipe, 304 / 304L Flanges, 304 / 304L Tees, 304 / 304L Stub Ends
Specifications
UNS S30400, UNS S30403, Werkstoff 1.4307, EN 1.4307
ASTM: A 240, A 276, ASTM A 312, A 479
ASME: SA-240
Chemical Composition, %
| Ni | Cr | Mn | Si | C | S | P | N | Fe | |
|---|---|---|---|---|---|---|---|---|---|
| MIN | 8.0 | 18.0 | - | - | - | - | - | - | - |
| MAX | 10.5 | 20.0 | 2.0 | 0.75 | 0.03 | 0.03 | 0.045 | 0.10 | Balance |
Features
- Good general corrosion resistance
- Ease of cleaning
- Excellent strength and toughness at cryogenic temperatures
- Good formability
- Good weldability
Applications
- Food processing and handling
- Heat exchangers
- Chemical process vessels
- Conveyors
- Architectural
Physical Properties
Density: 0.285 lb/inch3
Melting Range: 2550-2590°F
Poisson's Ration: 0.3
Electrical Resistivity: 433Ohm-circ mil/ft
| Temperature, °F | 70 | 212 | 932 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 9.2 | - |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
- | 9.4 | 12.4 |
| Modulus of Elasticity Dynamic, psi x 106 | 29 | - | - |
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties
| Ultimate Tensile Strength, ksi | 75 |
| 0.2% Yield Strength, ksi | 30 |
| Elongation, % | 40 |
| Hardness MAX, Brinell | 201 |
Typical Tensile and Impact Properties
| Temperature, °F | -425 | -320 | -100 | 70 | 400 | 800 | 1200 |
| Ultimate Tensile Strength, ksi | 250 | 230 | 150 | 90 | 70 | 66 | 48 |
| 0.2 % Yield Strength, ksi | 100 | 70 | 50 | 35 | 23 | 19 | 15.5 |
| Charpy Impact V-notch, ft-lbs | 85 | 85 | - | 150 | - | - | - |
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