Method for effectively controlling decarburized layer of 65Mn hot-rolled narrow strip steel

By adjusting the heating furnace temperature and controlling the furnace time during the hot rolling process of 65Mn steel strip, the problem of decarbonization layer control of narrow strip steel is solved, and effective control of the depth of the decarbonization layer is achieved, which improves the performance of the steel strip and reduces costs.

CN119685582APending Publication Date: 2025-03-25NANJING IRON & STEEL CO LTD
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Patent Information

Application Number
CN202411630973.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

During the hot rolling process of 65Mn steel strip, the steel surface is prone to decarbonization, resulting in inconsistent carbon content, affecting hardenability and service life, and it is difficult for the prior art to effectively control the decarbonization layer of narrow strip steel.

Method used

By adjusting the temperature settings of each section of the stepping heating furnace, ensure that the temperature of the first section and the second section of the heating furnace is higher than the decarbonization sensitive temperature range of 65Mn steel, and strictly control the furnace time, which includes controlling the temperature of the first section of the heating furnace to be 1050℃, the temperature of the second section of the heating furnace to be 1150℃, and controlling the feeding method and stepping speed of the heating furnace.

Benefits of technology

Effectively control the depth of the decarbonization layer of the 65Mn steel belt ≤0.06mm, which improves the performance of the steel belt and meets the user's delivery and use requirements, while avoiding the transformation of equipment and adding additional processes, reducing costs.

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Abstract

The invention discloses a method for effectively controlling a decarburized layer of 65Mn hot-rolled narrow strip steel, which relates to the technical field of steel production and comprises the step of controlling the temperature of a first heating section and a second heating section in a heating furnace to be higher than a decarburization sensitive temperature interval of 65Mn steel. The depth of the 65Mn steel strip decarburized layer is controlled to be less than or equal to 0.06 mm only by adjusting the temperature setting of each section of the walking beam furnace and strictly controlling the in-furnace time, so that the performance is improved, the delivery and use requirements of users are further met, the method can be directly applied to existing equipment, the existing equipment does not need to be transformed, additional procedures such as blank peeling and coating are not added, and the production cost is reduced. And the cost is effectively reduced.
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