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302 Stainless Steel

Penn Stainless inventory now includes Alloy 302 (UNS S30200) in sheet, sheet coil, plate, round bar, processed flat bar and tubular products.

 

General Properties

Alloy 302 is a variations of the 18% chromium / 8% nickel austenitic alloy, which is the most familiar and the most frequently used in the stainless steel family. Alloy 302 is a slightly higher carbon version of 304, often found in strip and wire forms. It is a tough, ductile grade that demonstrates comparable corrosion resistance, is non-magnetic, and is not hardenable by heat treatment. Alloy 302 is usually used in its annealed condition and has a high ease of fabrication and formability.

Specifications: UNS S30200

Applications:

Although many applications have shifted to 304 and 304L due to advances in melting technology, availability, and cost, Alloy 302 is still used in a variety of industries. Some examples include:

  • Stamping
  • Spinning
  • Wire forming
  • Formed into all types of washers, springs, screens, and cables
  • Food and beverage industry
  • Pressure containing applications
  • Sanitary or cryogenic applications

Some examples of products that are partially or completely constructed of 302 include:

  • Blenders
  • Counters
  • Dish racks
  • Dishwashers
  • Refrigerators
  • Washing machines

 

Standards:

  • ASTM/ASME: UNS S30200
  • EURONORM: FeMi35Cr20Cu4Mo2
  • DIN: 2.4660

Corrosion Resistance

  • Provides useful resistance to corrosion on a wide range of moderately oxidizing to moderately reducing environments
  • The 18 -19% of chromium which this alloy contains provides resistance to oxidizing environments such as dilute nitric acid.
  • Resistant to moderately aggressive organic acids such as acetic, and reducing acids such as phosphoric.
  • The 9-11% of nickel contained in this alloy provides resistance to moderately reducing environments.

Machinability

  • Slow speeds and high feeds will overcome this alloy’s tendency to work-harden
  • Due to gummy chips, it is recommended that chip breakers are used on all tooling

Weldability

  • Can best be welded by resistance or shielded fusion methods
  • Post weld annealing dissolves the chromium carbide and is recommended for maximum resistance to intergranular attack

Hot Working

  • Uniform heating to 2100oF will allow this allow to be forged, upset and headed successfully
  • Do not work below 1700oF 

Cold Working

  • Will dramatically increase the hardness of this material; however, it is quite ductile and may readily be drawn, spun and upset
  • Causes alloy 302 to become magnetic
  • Post-fabrication annealing is necessary to retain maximum corrosion resistance and a non-magnetic condition

Chemical Properties:

C Mn Si P S Cr Ni N
302 max: 0.15 max:2.0 max: 0.75 max: 0.045 max: 0.03 min: 17.0 max: 19.0 min: 8.0 max: 10.0 max: 0.10

Mechanical Properties:

Grade Tensile Strength ksi (min) Yield Strength 0.2% ksi (min) Elongation % Hardness (Rockwell B) MAX
302 75 30 40 92

Physical Properties:

Density
lbm/in3
Thermal Conductivity
(BTU/h ft. °F)
Electrical
Resistivity
(in x 10-6)
Modulus of
Elasticity
(psi x 106
Coefficient of
Thermal Expansion
(in/in)/
°F x 10-6
Specific Heat
(BTU/lb/
°F)
Melting
Range
(°F)
at 68°F: 0.285 9.4 at 212°F 72.0 at 70°F 28 9.6 at 32 – 212°F 0.1200 at 32°F to 212°F 2500 to 2590
12.4 at 932 °F 10.2 at 32 – 1000°F
10.4 at 32 – 1500°F

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