Heat treatment of dies of steel Kh12
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The use of austempering permits a substantial increase in the strength and toughness of steel Kh12, with retention of high hardness (HRC 60–63).
The optimal austempering temperature is in the range of 250–350°; increasing the austempering time (up to 40 min) leads to an increase of strength but does not change the toughness or hardness.
The quenching temperature for obtaining high strength is 1000°, and for obtaining high toughness 1050°.
It is recommended that extrusion dies be quenched from 1000° in a salt bath at 300–350° for 40 min and tempered at 240° for 1 h. This increases the service life of dies by 300–400% as compared with dies quenched in oil.
For minimal distortion with retention of high strength, hardness, and toughness it is recommended that dies be quenched from 1025° in a salt bath at 350° and tempered at 250°.
KeywordsHeat Treatment Service Life High Hardness Austempering Salt Bath
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