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Heat Treating Steel

Heat Treating Steel. By: Louie Mysse Brandon Okerlund. Heat Treatment Processes. Tempering Annealing Stress Relieving Normalizing Quenching. Tempering. Reheating a Hardened Material Increases Ductility and Toughness Three Components Temperature Time Cooling Rate.

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Heat Treating Steel

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  1. Heat Treating Steel By: Louie Mysse Brandon Okerlund

  2. Heat Treatment Processes • Tempering • Annealing • Stress Relieving • Normalizing • Quenching

  3. Tempering • Reheating a Hardened Material • Increases Ductility and Toughness • Three Components • Temperature • Time • Cooling Rate

  4. Annealing • Heating and holding a suitable temperature followed by an appropriate cooling rate. • Quenching has to occur • Produces desirable changes in the material properties or microstructure

  5. Stress-Relief • Relieves stresses that remain locked in a structure as a consequence of a manufacturing sequence • Welding • Cutting with a torch • Machining

  6. Normalizing • Both Thermal and Microstructure point of view • Thermal • Heating then cooled in still or slightly agitated air

  7. Quenching • Rapid cooling of steel from an elevated temperature • Typical Quenching techniques • Water • Oil • Air

  8. How To Heat Treat In Shop • What is the hardness required? • Refer to Heat Treater’s Guide • How Deep do You Need the Treatment? • Case • Through • What type of Heat Treatment is required? • Tempering, Annealing, Stress-Relief, Normalizing, Quenching

  9. How To Heat Treat In Shop • Turn On Furnace • Set To Appropriate Temperature • Determine from references • Place Metal In Furnace When Up to Temperature • Leave for determined time • Remove and Immediately Quench • Quench in appropriate fluid • Oil, Water, Air • Re-Set Furnace Temperature (Tempering) • Place Metal Back in Furnace (Tempering) • Leave for determined time • Remove and Cool at Designated Rate (Tempering)

  10. Sample Annealing Video

  11. Ordering Heat Treating Processes • Establish the type of steel that will be used • Determine the desired properties • Hardness • Case/Through • Choose the proper quenching technique

  12. References • Metals Handbook Desk Edition, Second Edition. • JR Davis, Davis and Associates, 1998, ASM International • Steel Aluminum Stock List and Reference Book, • Jorgensen Steel, Earle M. Jorgensen Co., 1998. (Section S.)

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