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Welding and repairing method of heat-resisting steel casting

A technology for heat-resistant steel and castings, applied in the field of heat-resistant steel welding, can solve the problems of strong cold crack sensitivity, high mechanical performance requirements, unreasonable process operation, etc., to achieve uniform and controllable temperature and improved welding qualification rate. , reduce the effect of carbon increase site

Inactive Publication Date: 2018-11-23
KOCEL STEEL
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Problems solved by technology

Moreover, castings of this material are highly sensitive to welding cold cracks, and are easily cracked if the process operation is unreasonable; the mechanical properties are high, and the welding process must be carefully controlled to ensure that the performance meets the standard requirements.

Method used

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Embodiment Construction

[0020] In order to illustrate the technical solution implemented by the present invention more clearly, the technical solution of the present invention will be further described below.

[0021] A welding repair method for heat-resistant steel castings is used for welding GX23CrMoV12-1 material castings. The main steps include: defect treatment before welding, welding preheating, welding, post-welding heat, and post-weld heat treatment. The specific operation steps are as follows:

[0022] (1) Defect treatment before welding

[0023] 1) Use the method of ultrasonic flaw detection + magnetic particle flaw detection to mark the casting defects on the casting, and then deal with the defects. The method and principle of defect treatment: for volume defects, the defects are evaluated and removed according to the detection standards, and the defects are removed until the defects are no longer Exceeding the standard; to remove the crack defect, it is required to achieve the non-linear...

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Abstract

The invention belongs to the technical field of heat-resisting steel welding, particularly relates to a repairing method of a high-chromium martensite heat-resisting steel casting, and provides a welding and repairing method of a novel heat-resisting steel casting. The method comprises the main steps of defect treatment before welding, welding preheating, welding, heating after welding, and heat treatment after welding. By the adoption of the welding and repairing method, generation of weld cracks is reduced, the yield of welding and repairing is increased, the number of times of welding is reduced, and the repairing cost is reduced substantially.

Description

technical field [0001] The invention provides a welding repair method for heat-resistant steel castings, in particular to a repair method for high-chromium martensitic heat-resistant steel castings, and belongs to the technical field of heat-resistant steel welding. Background technique [0002] The invention relates to a high-alloy heat-resistant steel whose material is GX23CrMoV12-1. This material is based on 12CrMoV heat-resistant steel in the world. Through in-depth experimental research on the performance and microstructure of the material, the toughness of the material is understood. The chemical mechanism and the role of various alloying elements, material performance degradation and related microstructure changes and process performance, etc., by adjusting the alloying element composition of the material, adding trace alloying elements, etc., a series of new high-chromium (9 %~12%) martensitic heat-resistant steel, the most representative of which are P91 / T91 (X10CrM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K31/00B23K37/00
CPCB23K1/20B23K31/00B23K37/00
Inventor 陈得润周辉李成志冯周荣刘振雷永红
Owner KOCEL STEEL
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