Originally, this process used bone charcoal heated to an exact temperatureâ¦ PLAY. Case â¦ Process Nature of case Process temperature C F Typical case depth Case hardness, HRC Typical base metals Process characteristics Carburizing Pack Diffused carbon 815â1090 1500â2000 125 mmâ1.5 mm (5â60 mils) 50â63(a) Low-carbon steels, low-carbon alloy steel Low equipment costs; difï¬cult to control case â¦ materials. For Example: 4320 carburized at 1700ºF for 11 hours at temperature would attain âcase depthâ of 0.083 inches. Carbon Steel Typical Heat Treatments Case Hardening Grade Table Chart. No hardening would result, as 1200°F â¦ Surface Hardening: Surface hardening is done by heating the steel up to austenitizing temperature while keeping the core below that temperature â¦ Engineering Materials Applications & Design. Case hardening processes harden only the exterior of the steel part, creating a hard, wear resistant skin (the "caseâ¦ Case hardening steel grades depend on the temperature used during the treatment process. Hardening, Case Hardening and Tempering. 1425°F is the minimum recommended case hardening temperature and it takes a lot less time at the maximum of 1625°F. A method for case hardening a chromium bearing nickel or ferrous based alloy, for example stainless steel, article, the method including the steps of activating the surface of the article; and carburizing the activated surface at a temperature below that temperature â¦ Amrit Kumar. Heat Treatment: In â¦ Reading Time: 5 minutes. Table of Contents show. You can initially set the temperature 10 degrees above if you have a â¦ Heat Treatment Process-Annealing, Normalizing, Hardening, Tempering, Nitriding, Cyaniding Process, PDF. If you heated AISIC 1080 steel to 1200°F (649°C) and quenched it in water, what would happen? The theory is this: When low-carbon steel reaches a certain temperatureâ¦ STUDY. Case Hardening: Case hardening is done by red heating the steel, infusing carbon onto the surface and quickly quenching. For example, an initial carbon temperature ranging between 1650 to 1700 °F produces an SAE steel â¦ If 0.100 inches were specified it would require 16 hours. Source: Metal Progress, August 1943. Carbonnitriding is done by using a liquid salt bath (cynaide was commonly used) and the time/temperature ratio is supposed to be more or less the same for case hardening â¦ To case harden a part, the finished low-carbon steel part is heated, and then packed with a high-carbon compound, like Rose Mill's Cherry Red instant hardening compound. Keeping the correct temperature is key to preventing case hardening. Color case hardening (sometimes referred to as case-hardening, case color hardening, or surface hardening) is a heat treating process and one of the earliest ways of hardening lower-grade steel. How to Prevent Case Hardening Use the correct temperature.