A2 Tool Steel Heat Treat Shrinkage

Shrinkage and loss of magnetic properties.

A2 tool steel heat treat shrinkage.

For example an 80 mm 3 15 cube of d 2 tool steel fig. Figure 2 shows the dimensional change of d 2 tool steel during tempering. This widely used tool steel has low distortion in heat treatment good machinability good toughness for severe service high abrasion resistance and deep. For complex and large tools heat to 1150 1250 f 621 677 c and equalize.

2 reveals growth 0 08 in one dimension and shrinkage in the other two dimensions as a result of vacuum hardening. Heat treating steel chart. D 2 is a transformation hard ening tool steel that requires both a hardening and tempering step during the heat treating process. 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. Heat at a rate not exceeding 400 f per hour 222 c per hour. The prefix a in the name designates it as an air hardening steel. A 5 chromium steel which provides high hardness after heat treatment with good dimensional stability.

The dimensional changes on hardening figure 1 and tempering figure 2 p. Then heat to 1300 1400 f 704 760 c and equalize. 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. Soaking time should always be after the steel has caught up with the furnace tempera.

Plan for size change during heat treatment. It is heat treatable and will offer a hardness in the range 57 62 hrc. 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. Generally supplied annealed to hb 231 max.

A rule of thumb is that liquid quenched. The more highly alloyed grades such as h13 s7 a2 d2 and the high speed steels require multiple tempering cycles. A2 steel is an air hardening cold work tool steel. For simple geometries use only the second preheating temperature range.

A2 tool steel is a versatile air hardening tool steel that is characterized by good toughness and excellent dimensional stability in heat treatment a2 is intermediate in wear resistance between o1 oil hardening tool steel and d2 high carbon high chromium tool steel.