This particularly becomes and issue with thinner sections of steel. Your work piece is thicker and may not be affected by moving air, though atmospheric air has oxygen that can de-carburize the surface, leaving a softer "skin". May recommend still air quench in replaced atmosphere like nitrogen. Joined Feb 7, Messages I couldn't get the file Daryl posted to open.
It has been a long time since I made anything out of A2. As I remember, hardening A2 in small sections is pretty easy. Heat with a torch using a reducing flame to the right color. Hold to equalize and let it cool. The darned stuff hardens real nice. I wouldn't blow air on it for fear it would warp. The real tricky thing with A2 is you have to be sure you don't need to do any more machine operations. Annealing the stuff is nearly impossible without a proper furnace. Joined Jan 26, Messages 1, All of the A2 I have heat treated through the years has been in a furnace.
And then it was put in either a stainless steel bag or packed in cast iron chips to reduce the oxygen. Then left out to cool on it's own. Then put back into the oven for annealing to hardness wanted according to specs. I could not get that file to open either. I get the specific message "The file is damaged". Tried it 3 times to ensure it wasn't corrupted in download. Joined Dec 7, Messages The process for A-2 is heated in controlled atmosphere thus the stainless wrap is used to make a bag and place a small piece of paper in bag with part being hardened it will ignite in bad and burn up the oxygen in bag.
If you don't it will decarb and will scale up bad. I've worked in a tooling shop for many years and have done A-2 a lot. If I remember correctly temp should be for 1 hour per inch of cross section. Then remove from heat remove bag and let it cool without any air movement on it.
Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch To minimize internal stresses in cross sections greater than 6 inches Cryogenic Treatment: Some prefer to do cryogenic treatment as an extension of the quench from the austenitizing treatment.
Others prefer to cryogenically treat after tempering. Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of HBW. California Accept Read More. Chemical Composition The following table list A2 steel chemical composition. Alloy Steel Tool Steel. Next Post Stainless Steel Machinability. You might also like More from author. Prev Next. Leave A Reply.
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