A2 Tool Steel Heat Treat Chart

A2 tool steel is an air hardening cold work chromium alloy die steel that is preferable to o1 tool steel in applications requiring greater size stability machinability and safer hardening.

A2 tool steel heat treat chart. A2 tool steel is a 5 chromium medium alloy cold work tool steel possessing sufficient hardenability to be air hardened to 60 rc surface hardness level with good depth of hardening. A2 tool steel properties. The wear resistance properties and cost place a2 between that of o1 and d2 tool steel making it a good all purpose grade for many applications. A2 tool steel can be difficult to heat treat.

A2 air hardening tool steel annealing heat uniformly to 1650 f. Steel composition harden f temper f anneal f normalize f quench atmosphere. Generally supplied annealed to hb 231 max. A2 is also an air hardening tool steel but includes less than half the chromium 4 75 5 50 and a bit less carbon 0 95 1 05 than d2.

A 5 chromium steel which provides high hardness after heat treatment with good dimensional stability. Stress relieving when heavy machining cuts are employed the resultant stresses may be relieved by heating the material to 1200 f to 1250 f for one hour and cooling in still air. The heat treat process results in unavoidable size increases in tool steels because of the changes in their microstructure. It is heat treatable and will offer a hardness in the range 57 62 hrc.

A2 steel is an air hardening cold work tool steel. Like d2 it is incredibly resistant to distortion during heat treating and is moderately machinable and grindable. The chart below describes various types of tool steels their composition and appropriate heat treating applications. This widely used tool steel has low distortion in heat treatment good machinability good toughness for severe service high abrasion resistance and deep.

Most tool steels grow between about 0 0005 and 0 002 inch per inch of original length during heat treatment. This varies somewhat based on a number of theoretical and practical factors. The steel is composted of 1 percent carbon 3 percent silicon 6 percent manganese 5 3 percent chromium 1 1 percent molybdenum and 2 percent vanadium.