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Heat treatment process for die steel

A technology of die steel and process, applied in the field of heat treatment process of die steel, which can solve the problems of poor wear resistance and excessive wear

Inactive Publication Date: 2016-06-22
CHONGQING CITY BANAN DISTRICT YONGXING MACHINERY FACTORY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The 7CrSiMnMoV material die steel has poor wear resistance. When using it to manufacture the main working parts of the cold die, the die and the punch must be surface treated in advance, otherwise, it is easy to wear excessively and be scrapped

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment:

[0012] A heat treatment process for die steel, wherein the die steel is 7CrSiMnMoV material, and the mass percentages of the elements are: 0.65%-0.75%C, 0.85%-1.15%Si, 0.65%-1.05%Mn, 0.90%-1.20% Cr, 0.20%~0.50%Mo, 0.15%~0.30%V, ≤0.030%P, ≤0.030%S, and the rest is Fe. The heat treatment process includes the following steps:

[0013] (1) Complete annealing: heat at 840-860°C, hold for 1-2 hours, then cool the furnace to below 550°C and take out the furnace for air cooling;

[0014] (2) Incomplete annealing: Heating at 810-830°C, holding for 1-2 hours, then isothermal at 680-720°C, cooling down to below 500°C with the furnace and air-cooling;

[0015] (3) Quenching: Preheating at 680-720°C, heating at 860-920°C, heat preservation for 2-3 hours, oil cooling and quenching; (4) Flame heating surface quenching: overall preheating at 1500-1800°C, heating the surface with oxygen-acetylene fl...

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Abstract

The invention discloses a heat treatment process for die steel. The heat treatment process is characterized in that the die steel is a 7CrSiMnMoV material which contains, by mass, 0.65 to 0.75% of C, 0.85 to 1.15% of Si, 0.65 to 1.05% of Mn, 0.90 to 1.20% of Cr, 0.20 to 0.50% of Mo, 0.15 to 0.30% of V, no more than 0.030% of P and no more than 0.030% of S, with the balance being Fe; and the heat treatment process comprises the following steps: (1) complete annealing; (2) under annealing; (3) quenching; and (4) tempering. The heat treatment process for the die steel can improve the structure stability of the die steel and comprehensive performance like hardness, wear resistance and toughness of the die steel.

Description

technical field [0001] The invention belongs to the field of heat treatment technology, in particular to a heat treatment technology of die steel. Background technique [0002] The 7CrSiMnMoV material die steel has poor wear resistance. When it is used to manufacture the main working parts of the cold die, the die and the punch must be surface treated in advance, otherwise, it is easy to wear excessively and be scrapped. However, because the heat treatment process of 7CrSiMnMoV die steel is different from that of traditional die steel, a new heat treatment process is urgently needed. Contents of the invention [0003] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies. The present invention provides a heat treatment process for die steel, which can improve its structural stability, and improve its comprehensive properties such as hardness, wear resistance and toughness. [0004] The technical scheme that realizes the ob...

Claims

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Application Information

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IPC IPC(8): C21D6/00C22C38/24
Inventor 彭波
Owner CHONGQING CITY BANAN DISTRICT YONGXING MACHINERY FACTORY
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