ISO 9001:2008

Dual Hardness/Multiple Hardness Jobs

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Many jobs today require a single part to have multiple hardnesses on the same part. A job may have two specific hardness requirements or it may have certain areas that want to be hard or remain soft. Superior Heat Treat LLC can help you develop an approach that will meet your requirements. More than any other type of job, consultation with our staff to "game plan" how to meet process these jobs is extremely important. Techniques used to accomplish these jobs include, Carburize Only, Harden Only, Salt Hardening, Flame Hardening, and Flame Annealing or Drawing. Superior Heat Treat does not do induction hardening, but we can partner with outside firms to offer a turnkey solution on these types of jobs.

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Dual Hardness/Multiple Hardness Jobs
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Project Specifications

Product Lines

  • Tool Holders
  • Drive Shafts
  • Spindles
  • Retention Knobs


  • Carburize and Harden
  • Carburize Only
  • Flame Hardening
  • Flame Tempering
  • Harden Only
  • Quench and Temper
  • Martempering
  • Straightening


  • Carburizing Grades (8620, 9310, 4320, 4820, 1018, 1020, 12L14)
  • Alloy Steels
  • Tool Steels
  • Stainless Steels

Industries Served

  • Automotive
  • Aerospace
  • Farm Equipment
  • Heavy Machinery
  • Machine Tool
  • Military
  • Mining

Equipment List and Size Capabilities

  • 6 Internal Quench Ipsen Furnaces (Max Size at 36" x 36" x 48")
  • 10 Tempering Furnaces (Max Size at 48" x 48" x 48")
  • 1 Salt Bath (Max Size at 21" diameter x 30")

Industry Standards/Certifications

  • ISO 9001:2008 Registered
  • MIL-H-6875
  • AMS 2579
  • ANSI 3549

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