HEAT TREATMENT.
Heat slowly to Low Red heat, approximately 1375 degrees Fahrenheit (the higher the carbon the lower the heat). Care not to over-heat. Quench in good clean luke warm water. Draw to not over 350 degrees Fahrenheit.
TYPICAL ANALYSIS OF NON-SHRINKING OIL HARDENING STEEL.
| Carbon | . | 91 | % |
| Phosphorus | . | 016 | % |
| Sulphur | . | 019 | % |
| Manganese | 1. | 62 | % |
| Silicon | . | 31 | % |
| Iron (by deduction) | 97. | 125 | % |
USES.
Threading dies, chasers, taps, reamers, and all master tools. For gauges, plugs, etc. Especially adapted for stamping, punching, trimming dies and many other uses where it is necessary to overcome shrinking, warping or change of shape.
HEAT TREATMENT.
Heat very slowly to pre-heating temperature of 1200 degrees Fahrenheit, then to hardening temperature from 1360 degrees Fahrenheit to 1425 degrees Fahrenheit, depending upon size of piece being treated.
Harden in lard, linseed or cottonseed oil; preferably fish oil. Do not quench in water.
Draw cutting tools, taps and reamers at 250 degrees to 300 degrees Fahrenheit. Large tools such as blanking and stamping dies at 400 degrees to 450 degrees Fahrenheit.