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wpearson

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Posts posted by wpearson

    Annealing VS Normalizing

    in Heat Treating, general discussion

    Posted

    Can someone help me understand the difference between annealing and normalizing carbon steel. From my understanding both require the stock to be heated to the critical temperature and then cooled slowly. As far as I know in both cases the particles realine and the lattice is refined yielding a soft workable piece. Is normalizing just only used the context before heat treating versus before further working?

    Is their a difference and what is it? This may be a newbie question but maybe you guys can help me understand!

    Thanks! Caintuckrifle

    The difference is the rate of cooling. normalizing= cooling in still air. annealing= cooling in dry wood ash or vermiculite.

    Carburizing steel question

    in Knife Making

    Posted

    found this

    ThomasPowers

    • Senior Moment Member; Master Curmudgeon
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    Posted 11 Jan 2007 · Report post

    From a post I saved away years ago:

    "American Railway Engineering Association's Specifications for Soft-Steel Track Spikes. Original document, 1926, revised last in 1968

    Two classes of track spikes are given specifications, both low carbon and high c
    arbon. Two sizes of track spike are identified, one of 5/8 inch square shaft and
    one of 9/16 inch.

    Page 5-2-1. "A low carbon track spike will not contain greater than 0.12% carbon
    nor greater than 0.20% copper.

    Page 5-2-2. Section 6a.
    Bending properties: The body of a full size finished spike shall stand being ben
    t cold through 180 degrees flat on itself without cracking on the outside portio
    n of the bent portion.

    Page 5-2-2 Section 11. Marking. A letter or brand indicating the manufacturer sh
    all be pressed on the head of each spike while it is being formed. When copper i
    s specified, the letters "CU" shall be added.

    Page 5-2-3: Specifications for high carbon steel track spikes 1968. Carbon not g
    reater than 0.30%, nor greater than 0.20% copper. Page 5-2-4. Section 6a. Bendin
    g properties: The body of a full size finished spike shall stand being bent cold
    through 120 degrees around a pin, the diameter of which is not greater than the
    thickness of the spike without cracking on the outside portion of the bent port
    ion.

    Page 5-2-5 Section 11. Marking: A letter or brand indicating manufacturer and also the letters "HC" indicating high carbon, shall be pressed on the head of each spike while it is being formed. When copper is specified, the letters "CU" shall be added."

    Additionally included in a fax to Mike Blue by the gentleman at Wellington industries, a division of Sheffield Steel:
    "Because of the bending tests required, the carbon content will not be greater than 0.30%. After all, brittle spikes would not be desirable as a track spike. Abent spike still holds the rail while a fractured spike would not. The consequences for the industry would be too great to consider. However, we refer to them as high carbon, they are not within the range of steels known as high carbon or hypereutectoid according to the steel industry standards, and have not been since at least 1926, when most track spikes were previously manufactured from wrought iron.""

    I'd go with the spring stock myself!

    Thomas

    AMT standing drill press

    in Drills, Post drills, Mag drills, etc

    Posted

    The quill is the part of the drill press that holds the chuck and moves up and down while turning the chuck. A quill lock can be tightened to prevent the quill from moving. There is a stop on the side with the advance handle and this can be set to stop downward movement "Feed" at a preset depth.

     

    or you could spin it around and stop upward movement.

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