Technology for heat treatment on alloy cold headed steel

A technology of cold heading steel and alloy, which is applied in the field of heat treatment, can solve the problems that high strength cold heading steel cannot be produced, and achieve the effect of low cost and simple equipment

Inactive Publication Date: 2012-04-18
无锡翱天钢丝制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, at present, nitrogen plus methanol cracking gas is mostly used as the protective gas in the heat treatment process, or nitrogen plus LPG cracking gas is used as the protective gas in the heat treatment process, which must be put into pipeline nitrogen station equipment, cracking furnace, and atmosphere detection equipment. Under the circumstances, a one-time investment of more than 200,000 yuan is required for a heat treatment furnace below 10 tons to be equipped with the above-mentioned device
Domestic manufacturers who generally use electric furnaces to produce cold heading steel have not completely solved the problem of material decarburization, and decarburization is a very important indicator of cold heading steel products. Therefore, general low-grade equipment cannot produce high-strength cold heading steel. is also the reason

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention discloses a heat treatment process for alloy cold heading steel. The required equipment includes: an electric furnace, an oxygen content analyzer and an oxygen content control device. It is composed of furnace cover with (heating element), aluminized carbon steel liner and silicon controlled temperature control system. The oxygen content analyzer is used to detect the oxygen content in the electric furnace, so as to facilitate the oxygen content control device to control the oxygen content in the electric furnace.

[0031] It includes the following steps:

[0032] A) The electric furnace for heat treatment is dried in the furnace at 180°C;

[0033] In this step, it is mainly to dry the materials in the electric furnace and the moisture in the furnace body.

[0034] B) Place the alloy cold heading steel to be processed in a dried electric furnace, cover the furnace cover, open the exhaust port for 1 minute, and close the exhaust port;

[0035] C) heating...

Embodiment 2

[0047] A kind of alloy cold heading steel heat treatment process, it comprises the following steps:

[0048] A) The electric furnace for heat treatment is dried in the furnace at 200°C;

[0049] B) Place the alloy cold heading steel to be processed in a dried electric furnace, cover the furnace cover, open the exhaust port for 2 minutes, and close the exhaust port;

[0050] C) heating the temperature in the electric furnace to 680° C. within 300 minutes through the resistance band;

[0051] D) within 60 minutes, heat the temperature in the electric furnace to 745°C, and control the oxygen content in the electric furnace to 12%;

[0052] E) within 60 minutes, continue to heat the temperature in the electric furnace to 760°C;

[0053] F) maintain the temperature in the electric furnace at 760°C, the holding time is 350 minutes, and control the oxygen content in the electric furnace at 15%;

[0054] G) within 90 minutes, the temperature in the electric furnace is reduced to 72...

Embodiment 3

[0060] A kind of alloy cold heading steel heat treatment process, it comprises the following steps:

[0061] A) The electric furnace for heat treatment is dried in the furnace at 250°C;

[0062] B) placing the alloy cold heading steel to be processed in a dried electric furnace, covering the furnace cover, opening the exhaust port for 5 minutes, and closing the exhaust port;

[0063]C) heating the temperature in the electric furnace to 700° C. within 320 minutes through a resistance band;

[0064] D) within 70 minutes, the temperature in the electric furnace is heated to 750°C, and the oxygen content in the electric furnace is controlled at 12%;

[0065] E) within 70 minutes, continue to heat the temperature in the electric furnace to 765°C;

[0066] F) maintain the temperature in the electric furnace at 765°C, the holding time is 370 minutes, and control the oxygen content in the electric furnace at 15%;

[0067] G) within 100 minutes, the temperature in the electric furna...

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PUM

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Abstract

The invention discloses a technology for heat treatment on alloy cold headed steel. The technology for heat treatment on alloy cold headed steel comprises the following steps of drying the interior of a heat treatment electric furnace at a temperature of 180 to 250 DEG C, putting alloy cold headed steel needing to be treated into the dried heat treatment electric furnace, covering the dried heat treatment electric furnace with a furnace lid, opening a gas outlet, keeping a gas outlet opening state for 1 to 5 minutes, closing the gas outlet, and carrying out heating, heat preservation and cooling processes on the alloy cold headed steel in the heat treatment electric furnace according to a certain heating curve. The technology for heat treatment on alloy cold headed steel does not need anyprotective gas in heat treatment, can control oxygen content in the heat treatment electric furnace, and realizes heating, heat preservation and cooling of the alloy cold headed steel. An alloy cold headed steel wire treated by the technology provided by the invention has the characteristics that an oxygen layer can be fully cleaned up in 15% of hydrochloric acid, wherein cleaning time is 10 minutes; a part which belongs to a semi-decarburized layer and has the thickness below 0.05 millimeters is decarburized fully; a spheroidization rate is above 85%; and the alloy cold headed steel wire fully exceeds JIS standard level II. The technology for heat treatment on alloy cold headed steel needs simple equipment and has a low cost.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process for alloy cold heading steel. Background technique [0002] In recent years, the localization process of the fasteners of the core parts of family cars has been accelerated. The domestic fasteners represented by SCM435 alloy cold heading steel have been used in the engines of General Motors and Volkswagen. The requirements are particularly high. Generally, advanced heat treatment furnaces such as STC furnaces with RX gas (CO+H2+CO2+N2) protection are preferred for heat treatment, so equipment investment is large and production costs are high. [0003] In addition, at present, nitrogen plus methanol cracking gas is mostly used as the protective gas in the heat treatment process, or nitrogen plus LPG cracking gas is used as the protective gas in the heat treatment process, which must be put into pipeline nitrogen station equipment, cracking furnace, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D9/54
Inventor 戴春野
Owner 无锡翱天钢丝制品有限公司
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