Treatment method capable of enabling harness of steel welding joints to be uniform

A technology of uniform hardness and welded joints, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as the inability to guarantee the maximum Vickers hardness difference, inability to guarantee uniformity, etc., to achieve uniform hardness, stable weldment size, eliminate welding effect of stress

Inactive Publication Date: 2017-01-25
四川迪瑞机电设备有限公司
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Problems solved by technology

However, stress relief heat treatment can only eliminate the welding residual stress and stabilize the size of the weldment, but cannot guarantee the uniformity of hardness between the weld seam, the heat-affected zone and the base metal in the welded joint of the steel weldment, that is, it cannot guarantee the weld seam, The difference between the maximum Vickers hardness of any two points between the heat-affected zone and the parent metal does not exceed 20HV10

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  • Treatment method capable of enabling harness of steel welding joints to be uniform
  • Treatment method capable of enabling harness of steel welding joints to be uniform
  • Treatment method capable of enabling harness of steel welding joints to be uniform

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Embodiment Construction

[0018] The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0019] The invention provides a processing method for uniform hardness of steel welded joints. The low-alloy steel welded parts with a thickness of 40mm are subjected to normalizing heat treatment at 920°C / 1h, and then tempered at 590°C / 2h.

[0020] In order to verify the effect of this embodiment, the welded parts of the same material and the same welding process were subjected to tempering heat treatment at 590°C / 2h, tempering heat treatment at 640°C / 2h, and no post-weld heat treatment (that is, AW in the welded state). Sample, carry out Vickers hardness comparative measurement together with the sample of this embodiment, the measurement result is as follows Figure 1 to Figure 6 shown.

[0021] from Figure 1 to Figure 2 It can be seen from the test results that the weld seam, heat-affected zone and base metal The HV10 hardness ...

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Abstract

The invention provides a treatment method capable of enabling the harness of steel welding joints to be uniform. Steel welding pieces are subjected to normalizing heat treatment under the condition of 920 DEG C per hour and then are subjected to tempering heat treatment at 590 DEG C. The treatment method adopts a normalizing and tempering combining method, so that the aims of eliminating the welding stress of the steel welding piece and stabilizing the size of the welding piece can be fulfilled successfully, the difference between Vickers hardness values of any two points of a welding line on the same section of the steel (low-alloy steel) welding joints, a heat affected zone and a parent metal can be guaranteed to be less than or equal to 20 HV10, and the hardness of the welding line of the welding joints of the steel welding piece, the heat affected area and the parent metal is uniform, so that the requirements of a special welding structure (such as mirror plate parts in hydroelectric equipment) on the hardness uniformity of the welding joints and high size precision are met.

Description

technical field [0001] The invention relates to the technical field of manufacturing steel welded parts, in particular to a treatment method for uniform hardness of steel (low alloy steel) welded joints. Background technique [0002] At present, in order to eliminate the welding residual stress of steel (low alloy steel) weldments and ensure the dimensional stability of weldments, stress relief heat treatment is usually carried out after welding of steel weldments, especially for weldments with high dimensional accuracy requirements. Generally, heat treatment is carried out at 590°C to 640°C for 2 hours. However, stress relief heat treatment can only eliminate the welding residual stress and stabilize the size of the weldment, but cannot guarantee the uniformity of hardness between the weld seam, the heat-affected zone and the base metal in the welded joint of the steel weldment, that is, it cannot guarantee the weld seam, The difference between the maximum Vickers hardness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/28
Inventor 何富银易群利刘辉
Owner 四川迪瑞机电设备有限公司
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