High Carbon Spring Steels

Supporting a Wide Range of Spring Applications


  • Leaf Springs
  • Latches
  • Electrical Contacts
  • Straps and Clamps
  • Applications in virtually all industries

Common Alloys:

  • 1050 High Carbon Spring Steel - contains 0.47% to 0.55% carbon.  As-quenched hardness of RC58.
  • 1074/1075 High Carbon Spring Steel - contains 0.70% to 0.80% carbon.  As-quenched hardness of RC64.
  • 1095 High Carbon Spring Steel - contains 0.90% to 1.03% carbon.  As-quenched hardness of RC66.
  • High Carbon Spring Steels are most commonly supplied in annealed condition.  Manufacturing processes are followed by heat treating to obtain part design and performance characteristics.
  • 1074/1075 & 1095 High Carbon Spring Steels may be purchased from the mill as Blue Tempered Spring Steel, which is pre-heat treated and blued for corrosion resistance.  These materials are ideal for simple leaf springs.

Characteristics and Other Things to Know:

  • Easy to form.
  • Basic Heat Treating:
    • Step 1) Harden by heating to 1,450-1,550 degrees F and quench to obtain as-quenched, full hardness.
    • Step 2) Temper by heating to a target temperature within a range lower than the hardening temperature, which draws the hardness back to desired spring performance characteristics.
    • As tempered parts are very brittle and allow little or no flex without breaking.
  • Heat treat quenching may cause certain part configurations to warp, specifically relatively large, flat sections in thinner gauges.  Warping can be counteracted to a limited extent, by restraining during the tempering process (clamp tempering).
  • Requires surface finish treatment for corrosion resistance.