420F

UNS #S42020

420F is a hardenable 12% chrome steel with higher strength, hardness, and wear resistance than 410. The free-machining variation of standard 420, it is easy to machine, grind, and polish and has certain nongalling or nonseizing properties in service. Used mainly for machined parts requiring high hardness and good corrosion resistance, it is not recommended for vessels containing gases or liquids under high pressure or for plastic mold cavities where a high mirror finish is essential.

Type Analysis

  • Carbon (Maximum) 0.15
  • Phosphorus (Maximum) 0.06
  • Silicon (Maximum) 1
  • Manganese (Maximum) 1.25
  • Sulfur (Maximum) 0.15
  • Chromium (Nominal) 12.00-14.00
  • Molybdenum (Nominal) 0.6
  • Iron (Nominal) Balance

Applications

valve trim, pump shafts, needle valves, ball check valves, gears, cams, pivots

Applicable Specifications

  • AMS 5620
  • QQ-S-764
  • ASTM A582

Bar

Billet

Rod

Rounds

Wire

RELATED RESOURCES

Browse our growing library of resources including case studies, product brochures, technical data sheets, product selection guides and more.