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Residual-temperature normalizing process

A normalizing and process technology, applied in the field of residual temperature normalizing process, can solve the problems of reducing the processing efficiency of the workpiece, consuming more time, and prolonging the processing time of the workpiece, so as to reduce the holding time, ensure high efficiency, and shorten the time. Effect

Inactive Publication Date: 2018-01-23
WANXIANGQIANCHAO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the normalizing process in the prior art is all carried out separately, and the workpiece needs to be heated to Ac 3 or above Acm, it needs to consume a lot of energy, and it takes a lot of time to heat to Ac3 or above Acm, and such a treatment process needs to be kept warm for 60 minutes or longer after heating, which prolongs the processing time of the workpiece , reducing the processing efficiency of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a) Heat the forged piece after forging to 900°C and hold it for 30 minutes;

[0031] b) The forgings processed in step a are subjected to continuous forced cooling under the blowing of the fan, so that the temperature of the forgings is cooled to 550°C, and the cooling time is 150s;

[0032] c) Cool the forgings treated in step b to 200°C at room temperature;

[0033] d) Put the forgings treated in step d into the material frame for stacking and cooling.

Embodiment 2

[0035] a) Heat the forged piece after forging to 930°C and hold it for 40 minutes;

[0036] b) The forgings processed in step a are subjected to continuous forced cooling under the blowing of the fan, so that the temperature of the forgings is cooled to 600°C, and the cooling time is 160s;

[0037] c) Cool the forgings treated in step b to 250°C at room temperature;

[0038] d) Put the forgings treated in step d into the material frame for stacking and cooling.

Embodiment 3

[0040] a) Heat the forged piece after forging to 950°C and hold it for 60 minutes;

[0041] b) The forgings processed in step a are subjected to continuous forced cooling under the blowing of the fan, so that the temperature of the forgings is cooled to 650°C, and the cooling time is 170s;

[0042] c) Cool the forgings treated in step b to 300°C at room temperature;

[0043] d) Put the forgings treated in step d into the material frame for stacking and cooling.

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Abstract

The invention discloses a residual-temperature normalizing process. The residual-temperature normalizing process comprises the steps of forged part micro-heating, heat preservation, forced cooling, dispersion air cooling, stack cooling and the like. According to the residual-temperature normalizing process, forging waste heat is fully utilized, and high efficiency of energy utilization is guaranteed; the heat preservation time is reduced, the time of the process procedure is shortened, and treatment efficiency is improved; and according to a forged part treated through the residual-temperaturenormalizing process, metallographic structures are fine and are evenly distributed, it is guaranteed that the hardness of the forged part ranges from 210 HB to 280 HB, and the depth of a surface layer decarburization layer is smaller than 0.3 mm.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a residual temperature normalizing process. Background technique [0002] Normalizing, also known as normalization, is to heat the workpiece to Ac 3 (Ac refers to the end temperature at which free ferrite completely transforms into austenite during heating, generally between 727°C and 912°C) or Acm (Acm is the critical point for complete austenitization of hypereutectoid steel in actual heating Temperature line) above 30 ~ 50 ℃, after a period of heat preservation, the metal heat treatment process is taken out from the furnace and cooled in the air or sprayed with water, sprayed or blown. Its purpose is to make grain refinement and carbide distribution uniform; the difference between normalizing and annealing is that the cooling rate of normalizing is slightly faster than that of annealing, so the normalizing structure is finer than the annealing struct...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/30
Inventor 冯雪忠
Owner WANXIANGQIANCHAO CO LTD
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