Easy-to-cut high-carbon steel annealing non-oxidation process

A high-carbon steel, non-oxidation technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of oxidation and decarburization, and achieve the effect of preventing surface oxidation, solving decarburization and oxidation, and eliminating pickling process

Inactive Publication Date: 2009-07-08
海南丰兴精密产业股份有限公司
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of oxidation and decarburization in the annealing process of high-carbon steel in the prior art, the purpose of the present invention is to provide an oxidation-free annealing process for easy-cut high-carbon steel

Method used

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Examples

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Embodiment Construction

[0010] In the high-carbon steel workpiece of the present invention, in the high-temperature annealing process, at first the high-carbon steel workpiece of no more than 400KG is added in the annealing furnace, and then adding carbon (2KG) that is 1:200 with the high-carbon steel mass ratio in the annealing furnace, After heating at a constant temperature of 750° C. for 5 hours, the temperature was gradually lowered to 694° C. and kept at a constant temperature for 5 hours.

[0011] In order to illustrate the idea and purpose of the present invention, the following will take the high-carbon steel wire drawing process as a specific example to further illustrate the present invention.

[0012] The present invention is described by taking the annealing and drawing process of high carbon steel as an example. For the first annealing, the stress should be removed first. The specific operation process is: put about 14 coils of high-carbon steel coils, no more than 400KG, into the annea...

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Abstract

The invention discloses a free-cutting high-carbon steel anneal non-oxidation technique. Workpieces are put into an annealing oven for annealing with the control of temperature and heating time, in the annealing process, carbon having a mass ratio of 1:200 with the workpieces is added into the annealing oven, the workpieces are heated under a temperature of 750 DEG C for five hours, and then are heated under a temperature of 694 DEG C for another five hours.According to the invention, decarburization in the anneal course of high-carbon steel can be prevented and quenching hardness can be improved, because carbon having a mass ratio of 1:200 with the workpieces is added into the annealing oven in the annealing process of high-carbon steels, subsequent acid washing process can be omitted, surface quality of the high-carbon steel can be improved and processing cost of the high-carbon steel can be reduced.

Description

Technical field: [0001] The invention relates to an annealing process for metal materials, in particular to an oxidation-free annealing process for easy-cut high-carbon steel. Background technique: [0002] High-carbon steel wire is the high-strength high-carbon pearlitic steel wire with the highest strength among mass-produced steel types and has been strengthened by wire drawing. It has been widely used in precision instruments and meters, springs, prestressed PC steel wires, steel wires for bridges, steel wire ropes, steel cords, etc. , occupies an important position in the industry. [0003] Most of the steel wire products with small diameter are drawn on the basis of high carbon steel wire as raw material. By controlling the mechanical and physical properties of the steel wire material, high-quality, small-diameter steel wire can be drawn. Generally, the raw high-carbon steel wire is heated at high temperature, and then drawn through a wire drawing machine. However, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/00
Inventor 沈旗卫
Owner 海南丰兴精密产业股份有限公司
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