Method for refining grain and primary carbide at edge of stainless steel cutter

Method for refining grain and primary carbide at edge of stainless steel cutter

  • CN 108,588,383 B
  • Filed: 03/20/2018
  • Issued: 08/03/2021
  • Est. Priority Date: 03/20/2018
  • Status: Active Grant
First Claim
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1. A method for refining grain and primary carbide at the edge of a stainless steel cutter is characterized in that the edge of the cutter is heated to be above austenitizing temperature and kept warm for a period of time, then the cutter is discharged, multi-pass roll forging is applied to the edge of the cutter, and then recrystallization annealing and secondary quenching are carried out to refine the grain and the primary carbide at the edge of the cutter;

  • the method specifically comprises the following steps;

    heating the edge part of the cutter to 1000-1075 ℃

    , preserving heat for 5-10 minutes, discharging the cutter from a furnace, performing roll forging to reduce the thickness of the cutter edge to 1.0-1.5mm, and then performing air cooling to room temperature;

    carrying out recrystallization annealing on the cutter subjected to roll forging at the annealing temperature of 750-800 ℃

    , and preserving heat for 2-3 hours;

    air cooling the annealed blade part after secondary quenching is carried out, and refining the crystal grains and primary carbide of the blade part of the cutter is completed;

    the roll forging conditions are as follows;

    the roll forging temperature is 600-750 ℃

    , the pass of the roll forging is 5-7 times,the cutter blank of the stainless steel cutter is processed by high-carbon martensitic stainless steel.

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