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Type 430 Stainless Steel
Description
Type 430 (UNS S 43000) stainless is a corrosion and heat resistant chromium steel, nonhardenable by heat treatment. It has good ductility and excellent resistance to atmospheric corrosion. Its oxidation resistance is superior to Type 304 in intermittent service, but somewhat lower than Type 304 in continuous service. Type 430 is magnetic in all conditions.

Product Forms
Ingots, Slabs, Hot bands, Sheet, Strip

Typical Applications

  • Architectural applications
  • Automotive trim
  • Bank vaults
  • Cooking utensils
  • fasteners
  • Food processing
  • Nitric acid processing and transportation
  • Nitrogen fixation equipment
  • Oil burner parts
  • Petroleum refining equipment
  • Recuperators
  • Skewers
  • Tanks
  • Television cones
  • Tobacco machinery
  • Tubing

Chemical Composition
Carbon Manganese Silicon Chromium Other
0.12 max. 1.00 max. 1.00 max. 16/18 Ti/Cb

Typical Mechanical Properties
Finish/
Condition		 Yield
Strength
psi		 Tensile
Strength
psi		 Elongation
in 2 in.,
%		 Hardness
Rockwell
B
No. 1/2D Finish,
annealed		 48,000 73,000 29 80
No. 2/2B Finish,
skin passed		 50,000 74,000 27 85

Processing

  • Annealing
    Heat to 1400-1500°F and air-cool to relieve hot rolled or cold worked stresses and restore ductility.
  • Hardening
    Type 430 cannot be hardened by heat treatment. Its work hardening rate is lower than austenitic 300 series stainless steels. See table of Typical Mechanical Properties.

Hot Working

  • Initial forging and pressing temperature - 1900-2050°F.
  • Finishing temperature - 1400°F.
  • Finishing temperature should be such as to ensure a fine grain, which can then be annealed to produce desired ductility and toughness.

Forming
Type 430 has excellent ductility and can be formed readily into most desired shapes by rolling, bending, drawing, etc.

Physical Properties
Density
lb./cu. in.		 Modulus of
Elasticity
in Tension
x 10^6, psi		 Specific
Heat
Btu/°F/lb		 Thermal
Conductivity
Btu/hr/ft^2/ft/		 Mean Coefficient
of Thermal Expansion
per °F(x 10^-6)		 Melting
Point
Range		 Electrical
Resistivity
microohn-cm
32-212 °F °F °F °F @ 70 °F
0.29 28.0 0.12 212 932 32-212 32-600 32-1000 32-1200 2600/
2750		 60
15.1 15.2 5.8 6.1 6.3 6.6

Elevated Temperature Strength
Creep Strength,
load for 1% elong
10,000 hr,psi		 Temperature
1000 °F 1100 °F 1200 °F 1300 °F
8400 4900 2200 1400

Welding
Type 430 can be joined by electric arc welding, using Type 430 electrodes. In some application, Types 309 or 310 electrodes may be used. Such welds should not be used where severe impact loads will be encountered. Spot welding may be used where service requirements, such as load and shock, are light. In certain cases, welds may be made by gas welding. Some toughness can be obtained in the weld zone by reheating after welding to 1400-1500°F.
For corrosive service in moist environments, as welded Type 430 may be subject to heat affected zone corrosion unless subsequently annealed. Stabilized ferritic grades such as Types 439 and 444 avoid the problem.

Corrosion
While Type 430 does not have the very high corrosion resistance of the higher chromium or the chromium-nickel steels, it does have excellent resistance to atmosphere, mild acids (most organic acids), nitric acid and alkalies.

Oxidation
Type 430 has excellent resistance to oxidation in elevated temperatures, being satisfactory up to 1600°F for intermittent service and 1600°F for continuous service. This grade forms a tightly adhering scale which is not easily dislodged during changes in temperature. The low coefficient of thermal expansion is the reason the scale remains intact during heating and cooling. Type 430 has very good resistance to sulfur-bearing gases within the temperature range recommended.
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