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Boron-containing die steel and heat treatment method thereof

A heat treatment method and die steel technology, applied in heat treatment equipment, manufacturing tools, quenching agents, etc., can solve the problems of high brittleness and excessive carbides in die steel, and achieve high production efficiency, good fatigue resistance and spalling performance, good toughness

Inactive Publication Date: 2012-02-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness and toughness of this die steel reaches or even exceeds Cr12MoV or Cr12Mo1V1, and the cost is lower than that of Cr12MoV or Cr12Mo1V1, and the service life is long. It is especially suitable for making high-precision and high-life cold work dies. Big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The heat treatment process of boron-containing die steel of the present invention is as follows:

[0027] 1) Put the boron-containing mold steel into the heating furnace, heat it up to 920°C and keep it for 4 hours; then cool the furnace to 500°C and then take it out of the furnace and air cool;

[0028] 2) Heat the mold steel treated in step 1) to 1080°C in a heating furnace, and keep it warm for 2 hours; then cool the furnace to 950°C and keep it warm for 3 hours; then cool it in quenching oil at a temperature of 30-60°C , wherein the mass ratio of quenching oil to die steel is 15:1;

[0029] 3) The mold steel treated in step 2) is heated to 250°C in a heating furnace and then kept for 8 hours; then the furnace is cooled to 150°C and then air-cooled, and finally finished to the specified size and precision.

Embodiment 2

[0031] 1) Put the boron-containing mold steel into the heating furnace, heat it up to 880°C and keep it warm for 8 hours; then cool the furnace to 500°C and take it out of the furnace for air cooling;

[0032] 2) Heat the mold steel treated in step 1) to 1050°C in a heating furnace, and keep it warm for 4 hours; then cool the furnace to 980°C and keep it warm for 1 hour; then, heat it in quenching oil at a temperature of 30-60°C Cooling, wherein the mass ratio of quenching oil to die steel is 15:1;

[0033] 3) The mold steel treated in step 2) is heated to 220°C in a heating furnace and then kept for 15 hours; then the furnace is cooled to 150°C and then air-cooled, and finally finished to the specified size and precision.

Embodiment 3

[0035] 1) Put the boron-containing mold steel into the heating furnace, heat it up to 900°C and keep it warm for 6 hours; then cool the furnace to 500°C and then take it out of the furnace and air cool;

[0036] 2) Heat the mold steel treated in step 1) to 1060°C in a heating furnace, and keep it warm for 3 hours; then cool the furnace to 960°C and keep it warm for 2 hours; then, heat it in quenching oil at a temperature of 30-60°C Cooling, wherein the mass ratio of quenching oil to die steel is 15:1;

[0037] 3) The mold steel treated in step 2) is heated to 240°C in a heating furnace and then kept for 10 hours; then the furnace is cooled to 150°C and then air-cooled, and finally finished to the specified size and precision.

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Abstract

The invention provides a boron-containing die steel and a heat treatment method thereof. The boron-containing die steel comprises the following chemical compositions in percentage by mass: 0.35 to 0.45 percent of C, 1.2 to 1.6 percent of B, 0.6 to 0.8 percent of Al, 1.8 to 2.5 percent of Cr, 0.4 to 0.6 percent of Mo, 0.3 to 0.5 percent of Ni, 0.05 to 0.30 percent of Ti, 0.02 to 0.15 percent of Ta, 0.05 to 0.20 percent of Nb, 0.5 to 1.0 percent of Mn, 0.3 to 0.5 percent of Si, 0.03 to 0.06 percent of Y, 0.008 to 0.020 percent of Ca and the balance of Fe, wherein Ti+Ta+Nb is greater than 0.30 and less than 0.55; S is less than 0.03; and P is less than 0.03. The heat treatment method of the boron-containing die steel of the invention comprises the following steps: heating the die steel in a heating furnace to the temperature of between 880 DEG C and 920 DEG C and then carrying out heat preservation for 4 to 8 hours; then continuously heating the die steel at the temperature of between 1,050 DEG C and 1,080 DEG C, carrying out heat preservation for 2 to 4 hours, carrying out furnace cooling to the temperature of between 950 DEG C and 980 DEG C and carrying out heat preservation for 1 to 3 hours; next, cooling the die steel in quenching oil; and finally, heating the processed die steel in the heating furnace to the temperature of between 220 DEG C and 250 DEG C, carrying out heat preservation for 8 to 15 hours, carrying out furnace cooling to the temperature of 150 DEG C, discharging the processed die steel and carrying out air cooling on the processed die steel. The die steel of the invention has the advantages of low cost and better toughness. The heat treatment method has simple process.

Description

【Technical field】 [0001] The invention relates to a die steel and a heat treatment method thereof, in particular to a boron-containing die steel and a heat treatment method thereof. 【Background technique】 [0002] With the development of the mechanical processing industry, more and more parts are manufactured by cold working dies in production, and more and more types of cold deformation dies are used. Such as cold volume die forging (cold heading, cold extrusion, embossing, etc.), sheet metal stamping (such as stretching, blanking, trimming, punching, etc.) and material rolling (cold rolling, rolling wheel forming, etc.). Although there are many types of cold deformation molds, different working conditions, and different performance requirements, the basic working conditions are similar: that is, the metal is deformed in a cold state, and it is subjected to large shear force, pressure, bending force, and impact during work. force and friction. Therefore, this type of mold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C22C38/54C21D1/58
Inventor 邢建东符寒光高义民雷永平皇志富
Owner XI AN JIAOTONG UNIV
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