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Controlled cooling technology of high-alloy tool steel

A technology of alloy tool steel and controlled cooling, applied in the direction of manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problem that the production quality is not too stable, and achieve the effect of ensuring quality, improving quality, and increasing martensite ratio

Inactive Publication Date: 2013-12-11
NANJING IRON & STEEL CO LTD
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Problems solved by technology

The quality of domestic production is not very stable, and the technical difficulty lies in the control of grain size and metallographic structure

Method used

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Embodiment Construction

[0012] A controlled cooling process for high-alloy tool steel, including 2-1# and 2-2# water tanks in front of the RSM unit (wire rod reducing and sizing unit), for cooling to obtain a suitable rolling temperature of the RSM unit; The cold line is adjusted by the speed of the roller table, the opening of the fan, and the opening of the air-cooled cover to obtain the best phase transition temperature. The controlled cooling process proceeds in the following steps:

[0013] 1. The 2-1# and 2-2# water tanks are all put into use to improve the cooling capacity and uniformity, to ensure that the temperature of the RSM unit is lower than 850°C, and the low-temperature final rolling is used to refine the grain. The water cooling line is set, the main pipe pressure is 5.5bar, and the opening is 70%; the pressure of 2-1# water tank is 2.5bar, and the opening is 90%; the pressure of 2-2# water tank is 3.1 bar, and the opening is 90%.

[0014] 2. Adjust the opening degree of 1-5# fans t...

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Abstract

The invention discloses a controlled cooling technology of high-alloy tool steel, which comprises the steps that controlled cooling is conducted by a water cooling line at the front of an RSM (rolling steel material) unit and a stelmor air cooling line, so that the high-alloy tool steel meeting a requirement is obtained; a 2-1# water tank and a 2-2# water tank which are at the front of the RSM unit are used for cooling, so that an appropriate rolling temperature of the RSM unit is obtained; the stelmor air cooling line obtains an optimal phase change transformation temperature through rollway speed adjustment, fan opening adjustment, and opening adjustment of an air cooling cover cap; and the high-alloy tool steel is obtained. The controlled cooling technology achieves grain refinement and a martensite ratio of above 85%, and the quality of a high-alloy tool steel coil rod is improved.

Description

technical field [0001] The invention relates to a controlled cooling process in the field of metallurgy, in particular to a controlled cooling process for high-alloy tool steel. Background technique [0002] High-alloy tool steel wire rod is mainly used to make hardware tools such as electric screwdriver bits and super-hard cross-drivers in European and American markets. It requires special properties such as super-hardness, high toughness, wear resistance, and high torque. Reaching HRC60 or above, in order to ensure personal safety, the twisting test must not have a split fracture. At present, this type of steel was mainly imported from abroad. The quality of domestic production is not very stable, and the technical difficulty lies in the control of grain size and metallographic structure. Contents of the invention [0003] In view of the shortcomings of the above prior art, the purpose of the present invention is to provide a controlled cooling process for high alloy ...

Claims

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Application Information

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IPC IPC(8): C21D11/00C21D6/00C21D1/84
Inventor 黄俊文彭学艺肖训军朱峰杨静
Owner NANJING IRON & STEEL CO LTD
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