A2 Tool Steel Heat Treat Shrinkage

Heat treating steel chart.

A2 tool steel heat treat shrinkage.

It is heat treatable and will offer a hardness in the range 57 62 hrc. A 5 chromium steel which provides high hardness after heat treatment with good dimensional stability. Shrinkage and loss of magnetic properties. The more highly alloyed grades such as h13 s7 a2 d2 and the high speed steels require multiple tempering cycles.

For complex and large tools heat to 1150 1250 f 621 677 c and equalize. 24 should be added. Then heat to 1300 1400 f 704 760 c and equalize. D 2 is a transformation hard ening tool steel that requires both a hardening and tempering step during the heat treating process.

A rule of thumb is that liquid quenched. A2 steel is an air hardening cold work tool steel. Figure 2 shows the dimensional change of d 2 tool steel during tempering. 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.

Aisi a2 tool steel is high carbon high alloy tool steel designed to have excellent wear resistance and toughness. An uddeholm data sheet shows that when d 2 tool steel 3 15 x 3 15 x 3 15 is austenitized at 1 870 degrees f for 30 minutes and quenched in a vacuum furnace with 2 bar nitrogen overpressure it grows in one dimension while shrinking in the other two. Plan for size change during heat treatment. This widely used tool steel has low distortion in heat treatment good machinability good toughness for severe service high abrasion resistance and deep.

Generally supplied annealed to hb 231 max. 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. The prefix a in the name designates it as an air hardening steel. For example an 80 mm 3 15 cube of d 2 tool steel fig.

2 reveals growth 0 08 in one dimension and shrinkage in the other two dimensions as a result of vacuum hardening. For simple geometries use only the second preheating temperature range. A simplified guide to heat treating tool steels. This graph demonstrates how knowing the part orientation from the mill supplied bar is important when trying to plan for size change during heat treatment.

Soaking time should always be after the steel has caught up with the furnace tempera.