Type 430F (UNS S43020/1.4104)

  • Provides excellent machinability, due to added sulfur.
  • Poor weldability.
  • Does not respond to heat treatment.
  • Cold worked by moderate operations.
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Type 430F stainless steel is ferritic straight chromium steel. Type 430F provides moderate resistance to corrosion and moderate strength. It does not provide good welding properties, but it can be welded, if necessary. Type 430F cannot be processed by heat treatment.

Grade 430F stainless steel typically available in bar form and mostly used in automatic screw machines. Due to its resistance to nitric acid it be can used in some chemical applications.

Type 430F is the free-machining version of type 430. Due to the addition of sulfur, it provides better machinability than type 430.

Common Names:

Stainless steel type 430F is commonly known as Chromium steel.

Executive Standards/Grades:

  • JIS: SUS 430F
  • EN: X10CrS17
  • ASTM: A314
  • UNS: S43020
  • DIN: 1.4104

Chemical Properties:

Type 430F stainless steel has the following chemical composition:

  • Carbon – 0.12%
  • Manganese – 1.25%
  • Chromium – 16%
  • Sulfur – 0.15%
  • Molybdenum – 0.60%
  • Silicon – 1.00%
  • Potassium – 0.06%
  • Iron – 81%

Mechanical Properties:

  • Hardness (HRB) – 86
  • Elongation (%) – 25
  • Poisson’s Ratio – 0.27-0.30
  • Tensile Strength (Mpa) – 550

Physical Properties:

  • Density (x1000 kg/cm3) – 7.8
  • Elastic modulus (GPa) – 200
  • Specific Heat (Btu/lb/oF – [32-212 oF]) – 0.11
  • Electrical Resistivity (microhm-cm (at 68 oF)) – 360
  • Specific gravity – 7.7
  • Melting point – 2700 oF

Key Features:

  • Straight chromium stainless steel with moderate corrosion resistance
  • Good machining properties, due to added sulfur
  • Moderate strength
  • Not usually welded, but can be if necessary
  • Does not respond to heat treatment
  • Moderate operations for cold forming

Forms Available:

Stainless steel type 430F is available in different forms such as:

  • Round bar
  • Flat bar
  • Inglot
  • Billet


Because of its properties, stainless steel type 430F has a wide range of applications including:

  • Gears
  • Shafts
  • Pinions
  • Fasteners

Possible Alternatives Grades:

Type 430F stainless steel has some possible alternatives that can be used. Such as:

  • 303 – Better corrosion resistance
  • 304 – Better weldability and cold forming
  • 430 – Good formability and corrosion
  • 316L – Better corrosion and pitting resistance


  • Can type 430F stainless steel be welded?

Due to the added sulfur content, type 430F stainless steel is not usually welded. Yet, it can be welded, if necessary, at low heat and using AWS E/ER430 filler metal.

  • How type 430F is hot work?

To be hot worked, type 430F stainless steel needs to be brought at a temperature of 1500 oF and then slowly heated at 1950-2100 oF.

  • Can type 430F be annealed?

The temperature range for the annealing of type 430 oF stainless steel is 1250 to 1400 oF. Then, it needs to be air-cooled.

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