Heat treatment process for large-size 20CrMnMoB guide rail

A large-scale, guide-rail technology, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of uneven mechanical properties testing results of the whole section, excessive quenching and cooling of workpieces, and inability to finish machining due to workpiece deformation. Quenching effect and uniformity, small deformation of workpiece, effect of reducing deformation and cracking of workpiece
CN113999952AInactive Publication Date: 2022-02-01HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
Publication Date
2022-02-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a heat treatment process for a large-sized 20CrMnMoB guide rail, which effectively solves the phenomena of deformation, cracking and non-uniform cooling after heat treatment of the large-sized 20CrMnMoB guide rail. A central hole is processed in the middle of a dead head end of a workpiece, and during heat treatment, a penetrating rod penetrates through the central hole to hang the workpiece in a pit furnace for suspending, so workpiece deformation in the heat treatment heating and quenching process is reduced; the integral uniform heating of the workpiece is ensured by adopting speed-limiting temperature rise and stepped heat preservation modes, the temperature difference inside and outside the workpiece is reduced, the internal thermal stress of the workpiece is reduced, and cracking or deformation of the workpiece is avoided; during quenching, a water-based liquid medium with the concentration of 9-15% is adopted for quenching and cooling, and the quenching effect and uniformity are guaranteed; and speed-limiting furnace cooling is adopted after tempering is finished, the internal stress of the workpiece can be effectively removed, finish machining deformation is avoided, the large-specification 20CrMnMoB guide rail produced through the method is small in workpiece deformation after heat treatment, the mechanical property of the total cross section is uniform and consistent, and the detection result is qualified.
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Description

technical field

[0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a heat treatment process for a large-size 20CrMnMoB guide rail which effectively solves the deformation, cracking and uneven cooling of the large-size 20CrMnMoB guide rail after heat treatment. Background technique

[0002] At present, in the production of 20CrMnMoB guide rails, due to their large specifications and external dimensions of about 560*280*7800, according to the conventional production method, heat treatment is carried out in a box-type resistance furnace. After heat treatment, the workpiece is not only deformed seriously but also has uneven quenching and cooling. As a result, the workpiece cannot be finished due to serious deformation and the test results of the mechanical properties of the full section are uneven, and there are unqualified phenomena.

[0003] In order to solve the above problems, measures such as increasing the...

Claims

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