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304 Stainless Steel and 304L Stainless Steel Sheet, Coil, & Bar - AMS 5513, 5511, 5647


304 / 304L stainless steel, also known as 18/8 stainless and often referred to as 302, is the most common stainless steel.  304 stainless steel contains a higher chromium and lower carbon content than other variations of type 302. It can be used in an "as welded" condition, while 302 must be annealed.  AISI 304 is used in a variety of household and industrial applications.  304L is an even lower carbon version of 304 stainless steel and can be used in more corrosive environments such as salt water and chemical containers.  

Both 304 and 304L can be used in the welded condition as opposed to the annealed condition and still maintain resistance to corrosion and lend themselves to many types of fabrication.  These grades resist corrosion and are often used in the food industry.


  • 304 / 304L Stainless Steel
    304 / 304L Stainless Steel

304 / 304L Coil
304 / 304L Sheet
304 / 304L Bar

Standard Inventory Specifications 

  • UNS S30403
  • UNS S30400
  • AMS 5513
  • AMS 5511
  • AMS 5647
  • ASTM A 240
  • ASME SA 240
  • W.NR 1.4307
  • PWA-LCS
  • GE-S400/1000
  • RR SABRe Edition 2
  • DFARS Compliant
  • SAE AMS 5513

Common Trade Names

  • ATI 304L (™ Allegheny Technologies)
  • ATI 304 (™ Allegheny Technologies)

Inventory Size Range

  • Sheet : 0.018" - 0.130"
  • Bar : 2.000", 4.000", 7.250"

Please contact us for more details.

Also Available 304 9% Nickel in the following thicknesses:

  • .008 (in)
  • .010 (in)
  • .012 (in)

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.

For a deeper understanding of the difference between 304 and 316, request our white paper on the topic.

304 Chemical Composition

Element Percent By Weight
Type 304 stainless
C Carbon 0.080 (304)
Mn Manganese 2.000
P Phosphorus 0.045
S Sulfur 0.030
Si Silicon 0.750
Cr Chromium 18.000 - 20.000
Ni Nickel 8.000 - 10.500
Al Aluminum 0.100

304L Chemical Composition

Element Percent By Weight
Type 304L stainless
C Carbon 0.030 (304L)
Mn Manganese 2.000
P Phosphorus 0.045
S Sulfur 0.030
Si Silicon 0.750
Cr Chromium 18.000 - 20.000
Ni Nickel 8.000 - 12.000
Al Aluminum 0.100
 

Common Applications of 304 & 304L Stainless Steel

  • Aerospace structures
  • Base plates
  • Food and beverage industry
  • Pressure containing applications
  • Architectural structures and design features, moldings and trims
  • Sanitary or cryogenic applications
  • Chemical industry processing equipment
 

304 / 304L Physical Properties

  • Density: 0.29 lb/in³ (8.03 g/cm³)
  • Modulus of Elasticity in Tension 29 x 106 psi (200 GPa)

Linear Coefficient of Thermal Expansion

Temperature Range Mean Coefficient of Thermal Expansion
°C °F mm/mm/°C in/in/°F · 10⁶
20 - 100 68 - 212 16.6 · 10-6 9.2 · 10-6
20 - 870 68 - 1600 19.8 · 10-6 11 · 10-6

 

Thermal Conductivity

Temperature Range W/m · K Btu/(hr/ft²/in/°F)
°C °F
100 212 16.3 9.4
500 932 21.4 12.4

Specific Heat

°C °F J/kg °K Btu/lb/°F
0-100 32-212 500 0.12

Magnetic Permeability

  • H/m Annealed
  • 1.02 Max @ 200 H

Electrical Resistivity

°C °F Microhm-cm MIcrohm-in.
20 68 72 28.3
100 212 78 30.7
200 392 86 33.8
400 752 100 39.4
600 1112 111 43.7
800 1472 121 47.6
900 1652 126 49.6

Mechanical Properties and Yield Strength of 304 / 304L

 
Property 302,304 304L 305
0.2% Offset Yield Strength, psi (MPa) 30,000 (205) 25,000 (170) 25,000 (170)
Ultimate Tensile Strength, psi (MPa) 75,000 (515) 70,000 (485) 70,000 (485)
Percent Elongation in 2 in. (51 mm) 40.0 40.0 40.0
Hardness, Max., Brinell (RB) 201 (92) 201 (92) 183 (88)

 

304 stainless steel decimal chart

Additional information about 304L

The most common Austenitic grade is Type 304/304L.  All other grades are developed from the 18-8 base by adding alloying elements to provide special corrosion-resistance, improved properties or better weldability.  Type 304/304L makes up over 60% of all the stainless steel made in world today. 

The wide usage of 304/304L stainless steel in food and beverage and pharmaceutical applications reflects the corrosion resistance qualities of these materials.  These industries demand that materials do not release significant quantities of contaminants into the product. They must also be easily cleaned.  For example, liquid blending and storage tanks are readily cleaned, providing proper hygiene in food prep as well as food and beverage handling.  Commercial dishwashing detergents eliminate 97% of microorganisms adhering to stainless steel surfaces.  Flavor and color are kept intact, with no impact from contact with the tank material.

Another innovative use of 304/304L can be found in architectural planning.  Sustainable engineering provides for a building's longevity and safety.  Design guidance for stainless steel structures incorporates the ability to hold up against the most severe natural disasters and even considers the resilience to withstand what we consider normal weather impact over time.  One example of sustainable engineering can be found in the National Archives of Canada in Gatineau, Quebec.  This impressive structure was designed to withstand flooding and seismic events.  The characteristics of nickel-containing Type 304L used in the structure provide safe-keeping for the country's most precious historical documents.  

 


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