A2 Tool Steel Heat Treat Shrinkage

Heat at a rate not exceeding 400 f per hour 222 c per hour. 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. 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.

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Dimensional Changes After Heat Treatment

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For example an 80 mm 3 15 cube of d 2 tool steel fig.

A2 tool steel heat treat shrinkage.

Heat treating steel chart. For simple geometries use only the second preheating temperature range. For complex and large tools heat to 1150 1250 f 621 677 c and equalize. Generally supplied annealed to hb 231 max.

Plan for size change during heat treatment. 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. Shrinkage and loss of magnetic properties. D 2 is a transformation hard ening tool steel that requires both a hardening and tempering step during the heat treating process.

2 reveals growth 0 08 in one dimension and shrinkage in the other two dimensions as a result of vacuum hardening. 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. A 5 chromium steel which provides high hardness after heat treatment with good dimensional stability. Then heat to 1300 1400 f 704 760 c and equalize.

Aisi a2 tool steel is high carbon high alloy tool steel designed to have excellent wear resistance and toughness. This widely used tool steel has low distortion in heat treatment good machinability good toughness for severe service high abrasion resistance and deep. The prefix a in the name designates it as an air hardening steel. A2 steel is an air hardening cold work tool steel.

A simplified guide to heat treating tool steels. The dimensional changes on hardening figure 1 and tempering figure 2 p. Figure 2 shows the dimensional change of d 2 tool steel during tempering. The more highly alloyed grades such as h13 s7 a2 d2 and the high speed steels require multiple tempering cycles.

24 should be added. A rule of thumb is that liquid quenched. 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.

It is heat treatable and will offer a hardness in the range 57 62 hrc.

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