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  • 1.  Tempering temperature for low plain carbon steel and low alloy steel

    Posted 06-13-2020 11:11
    Hi everyone!

    I'm material science engineer and work as quality engineer at heat treatment company. Besides I'm master of student at Gebze Technical University at Turkey. My department is material science and engineering. 

    I want to know, how can I calculate tempering temperature for plain carbon steel and low alloy steel. I know that have many parameters. Which one should I use TTT diagram or CCT diagram. I know that have many parameters.

    Thank you!

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    Burak Turk
    Material Science Engineer
    trburakturk@yahoo.com
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  • 2.  RE: Tempering temperature for low plain carbon steel and low alloy steel

    Posted 06-15-2020 08:28
    For tempering temperatures there is no use neither of TTT nor of CCT diagrams, which are useful only to assess steel quenching parameters or microstructure foreseeing during quenching different dimensions pieces.
    Instead, mechanical properties vs. tempering temperature diagrams for various carbon or alloy steels should be used to decide which tempering temperature is to be selected.
    If diagrams of the above type lack, the article by Grange et al. on Met. Trans., Nov. 1977, can be used to calculate hardness at various tempering temperatures of steel pieces with a given composition.

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    Donato Firrao FASM
    Professor
    Politecnico di Torino
    Torino
    +393351494032
    Italy
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    Original Message


  • 3.  RE: Tempering temperature for low plain carbon steel and low alloy steel

    Posted 06-15-2020 08:29
    ASM Heat Treaters Guide provides information on tempering temperature vs Hardness data for various grades of Metals.
    You can refer as per the grade you want to refer to .It is offered free online for members.
    However practically it may differ by  +-  5o degrees due to hardenability of the material .

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    N. Sampathkumar
    CEO
    Ambattur Metal Treaters.
    chennai
    9841035501
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    Original Message


  • 4.  RE: Tempering temperature for low plain carbon steel and low alloy steel

    Posted 06-15-2020 14:51
    I agree with the other answer. I will also add that, when in doubt and when it is critical, temper at a lower temperature first and measure hardness. If it is too high, temper again at 25°F to 50°F higher (about 15°C to 30°C higher). As a rule of thumb, every 25°F (15°C) will lower hardness about 1 point on the HRC scale.

    Note: Conversions approximated to nearest multiples of 5. These are rules of thumb, not exact.

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    Ken Kirby
    Snap-on, Inc.
    Kenosha WI
    (262) 748-3836
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    Original Message