304 / 304L

304 / 304L

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

 NiCrMnSiCSPNFe
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 Fittings, 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 - - -