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Stainless Steel 420F

Stainless Steel 420F, designated as UNS S42020, is a high-carbon martensitic stainless steel known for its outstanding strength and hardness. The addition of sulfur in its composition significantly improves machinability, making it an ideal choice for precision machining applications. This variant of 420 stainless steel retains all the beneficial properties of its standard counterpart, including excellent corrosion resistance in mild environments, while offering enhanced machinability.

Ferrobend’s Stainless Steel 420F is meticulously manufactured to meet stringent quality standards, ensuring consistent performance and reliability. This material can be heat-treated to achieve higher levels of strength and hardness, making it suitable for a variety of demanding applications. Its excellent corrosion resistance and ability to withstand high wear make it ideal for use in cutlery, surgical instruments, and other tools that require high durability and precision.

The material's enhanced machinability allows for easy fabrication into complex shapes and components, meeting the specific requirements of various engineering applications. The alloy’s ability to maintain high strength and hardness after heat treatment further enhances its suitability for demanding industrial tasks. Whether used in shafts, fasteners, or structural components, Stainless Steel 420F provides uniform strength and stability.

Choosing Ferrobend’s Stainless Steel 420F guarantees a robust and reliable solution for your industrial needs. Our commitment to quality and customer satisfaction ensures that you receive materials that perform exceptionally well, reducing maintenance costs and downtime. With Ferrobend, you can trust that our stainless steel products will deliver long-lasting performance and reliability in the most challenging environments.

Chemical Properties:

Elements Cr Ni C Si Mn P S Mo Fe
% min: 17.0 ,max:19.0 min: 8.0 ,max: 10.0 0.15 max 1.00 max 2.0 max 0.20 max 0.15 min 0.75 balance

Mechanical Properties:

Tensile Strength ksi (min.) Yield Strength 0.2% Offset ksi (min.) Elongation - % in 50 mm (min.) Hardness (Brinell) MAX Hardness (Rockwell B) MAX
75 30 35 228 -

Physical Properties:

Denstiy lbm/in3 Coefficient of Thermal Expansion (min/in)-°F Electrical Resistivity mW-in Thermal Conductivity BTU/hr-ft-°F Melting Range
at 68 °F at 68 – 212°F at 68 – 932°F at 68 – 1450°F at 68°F at 212°F at 392°F at 752°F at 1112°F at 1472°F at 68 – 212°F -
0.29 9.2 10.4 10.9 28.3 30.7 33.8 39.4 43.7 47.6 113.2 2552°F

Equivalent Grades and Designations:

SAE / AISI 303
UNS S30300
EN Material Number 1.4305
EN Material Name X8CrNiS18-9
DIN Material Name X8CrNiS18-9
JIS SUS 303
BS 202S 21 En58M

Heat Resistance:

  • Good oxidation resistance at temperatures up to 1700oF (927 oC)
  • Continuous use at temperatures above 1400oF (760oC) is not usually recommended due to carbide precipitation which can lead to irregular scaling
  • Does not have a low carbon content so it is also vulnerable to sensitization

Welding Characteristics:

  • Not generally recommended, but may be welded with some difficulty
  • May be welded with Alloy 310 electrodes
  • Should be annealed after welding to re-dissolve precipitated carbides

Machinability:

  • High machining rates can be obtained in the annealed condition with hardness in the range of 200 to 240 Brinell
  • Will work harden; therefore, it should be machined at reduced surface feet per minute and heavier feeds to prevent glazing at the tool interface.

Applications:

  • Nuts and bolts
  • Aircraft fittings
  • Gears
  • Screws
  • Shafts
  • Electrical switchgear components
  • Bushings