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.
Chemistry
| | 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 |
Specifications
AMS 5511, AMS 5513, AMS 5639, AMS 5647
ASME SA 240, ASME SA 312, ASME SA 479
ASTM A 240, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 312, ASTM A 479
UNS S30400, UNS S30403
W. NR./EN 1.4301, W. NR./EN 1.4307
Inventory
304 / 304L Coil, 304 / 304L Flanges, 304 / 304L Hex Bar, 304 / 304L Pipe, 304 / 304L Plate, 304 / 304L Round Bar, 304 / 304L Sheet, 304 / 304L Stub Ends, 304 / 304L Tees, 304 / 304L Welding Products
Common Trade Names
304 Stainless, 304L Stainless
Features
Good general corrosion resistance
Ease of cleaning
Excellent strength and toughness at cryogenic temperatures
Good formability
Good weldabilit
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 | – | – | – |
We can provide 304L material in the form of flange, fittings, pipes, fasteners.
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ASTM A182 F304L WN SO SW blind plate lap joint flange Images
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