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Homogenization treatment process of SAE8620 carburizing steel

A technology of normalizing heat treatment and carburizing steel, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of high cost and complicated process, and achieve the effect of reducing processing cost and simple process

Active Publication Date: 2007-05-02
WANXIANGQIANCHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a normalizing heat treatment process for SAE8620 carburized steel, which mainly solves the problem that the carburized steel in the prior art needs to be normalized multiple times before its hardness can meet the requirements and the metallographic structure can reach ferrite. The state of body plus pearlite, no bainite, and the process is more complicated, the cost is higher, etc.

Method used

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  • Homogenization treatment process of SAE8620 carburizing steel
  • Homogenization treatment process of SAE8620 carburizing steel

Examples

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Effect test

Embodiment 1

[0025] Example 1: put the billet made of SAE8620 steel into a continuous push rod furnace with a furnace temperature of 890°C, heat the billet to 890°C, keep it in the furnace for 1 hour, then raise the temperature to 910°C, and put it in the furnace After keeping warm for 2 hours, open the whole basket to air cool for 2 minutes, immediately close the whole basket and air cool for 2 minutes, then immediately put the steel into a continuous pusher furnace with a furnace temperature of 620°C, heat it to 620°C, hold it for 3 hours, and take it out of the oven. The basket is air-cooled, and the hardness can be 156HBS-207HBS (measured by the metal Brinell hardness test method stipulated in the national standard GB231-84), and the metallographic structure (as shown in Figure 2) is ferrite plus flaky pearlite, no Bainite Body machining with normalizing material.

Embodiment 2

[0026] Example 2: put the billet made of SAE8620 steel into a continuous push rod furnace with a furnace temperature of 880°C, heat the billet to 880°C, keep it in the furnace for 2 hours, then raise the temperature to 920°C, and put it in the furnace After keeping warm for 3 hours, open the whole basket to air cool for 3 minutes, immediately close the whole basket and air cool for 2 minutes, then immediately put the steel into a continuous pusher furnace with a furnace temperature of 640°C, heat it to 640°C, hold it for 4 hours, and take it out of the oven. The basket is air-cooled, and the hardness can be 156HBS-207HBS (measured by the metal Brinell hardness test method stipulated in the national standard GB231-84), and the metallographic structure (as shown in Figure 2) is ferrite plus flaky pearlite, no Bainite Body machining with normalizing material.

Embodiment 3

[0027] Example 3: Put the billet made of SAE8620 steel into a continuous push rod furnace with a temperature of 910°C in the furnace, heat the billet to 910°C, keep it in the furnace for 1 hour, and then raise the temperature to 930°C. After keeping warm for 2 hours, open the whole basket to air cool for 2 minutes, immediately close the whole basket and air cool for 3 minutes, then immediately put the steel into a continuous pusher furnace with a furnace temperature of 650°C, heat it to 650°C, hold it for 2 hours, and take it out of the oven. The basket is air-cooled, and the hardness can be 156HBS-207HBS (measured by the metal Brinell hardness test method stipulated in the national standard GB231-84), and the metallographic structure (as shown in Figure 2) is ferrite plus flaky pearlite, no Bainite Body machining with normalizing material.

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Abstract

This invention relates to a heat treatment technology of steel products, especially relating to a normalizing heat treatment technology of SAE8620 carburizing steel. It mainly solves the problems what exist in present technique such as: its hardness can achieve the requirement, microstructure can achieve state that ferrite adds perlite and no bainite carburizing steel utilizing normalizing many times, and technology is complicated, cost is high. Technology steps of this invention is: after steel products are putted in continuous push rod stove of which stove temperature is 890deg.C -950deg.C to heat to 850deg.C -930deg.C, keep temperature 0.5-4 hours; After reheat to 890DEG C-950deg.C, keep temperature 1-6 hours; Release and close whole basket and wind chill 2-8 minutes; Release and open wide whole basket and wind chill.

Description

technical field [0001] The invention relates to a heat treatment process of steel, in particular to a normalizing heat treatment process of SAE8620 carburizing steel. Background technique [0002] The presence of bainite in carburized steel and too high hardness (greater than 207HBS) or too low hardness (less than 156HBS) will generally have an adverse effect on machining, so that the steel cannot be machined into shape. Chinese patent discloses a heat treatment method for corrosion-resistant steel parts (publication number: CN 1026499C), the intersection temperature (A3) of the austenite transformation to ferrite and carbonite of the steel part is between 650 and 850 °C ; and the composition of the steel obtained under the condition of a cooling rate lower than 10°C / min substantially does not have martensite microstructure strength; the method is: (a) transferring a corrosion-resistant steel piece at a temperature higher than that of the above-mentioned A3 phase Thermal pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D11/00
Inventor 王晓华
Owner WANXIANGQIANCHAO CO LTD
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