A2 Tool Steel Heat Treat Shrinkage

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.

A2 tool steel heat treat shrinkage.

Shrinkage and loss of magnetic properties. Heat treating steel chart. Heat at a rate not exceeding 400 f per hour 222 c per hour. A2 steel is an air hardening cold work tool steel.

A 5 chromium steel which provides high hardness after heat treatment with good dimensional stability. The more highly alloyed grades such as h13 s7 a2 d2 and the high speed steels require multiple tempering cycles. A rule of thumb is that liquid quenched. Figure 2 shows the dimensional change of d 2 tool steel during tempering.

For simple geometries use only the second preheating temperature range. 2 reveals growth 0 08 in one dimension and shrinkage in the other two dimensions as a result of vacuum hardening. The dimensional changes on hardening figure 1 and tempering figure 2 p. Aisi a2 tool steel is high carbon high alloy tool steel designed to have excellent wear resistance and toughness.

24 should be added. For complex and large tools heat to 1150 1250 f 621 677 c and equalize. Soaking time should always be after the steel has caught up with the furnace tempera. 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.

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. 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. Plan for size change during heat treatment. A simplified guide to heat treating tool steels.

For example an 80 mm 3 15 cube of d 2 tool steel fig. It is heat treatable and will offer a hardness in the range 57 62 hrc. D 2 is a transformation hard ening tool steel that requires both a hardening and tempering step during the heat treating process. 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.