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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.

Overview

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
Resistence

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.
Processing

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
Properties

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 10(6))		 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

Alloy 302 PDF
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