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Defect mending method for martensite heat-resistant steel threaded hole

A defect repair and threaded hole technology, applied in the field of threaded hole defect repair of steel castings, can solve problems such as inapplicability of preheating welding methods, workpiece deformation, and impact on dimensional accuracy.

Inactive Publication Date: 2016-10-12
KOCEL STEEL
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Problems solved by technology

After the martensitic steel molten pool is solidified, the stress of the weld seam is large, which will easily cause the deformation of the workpiece, affect the dimensional accuracy, and even be scrapped.
In order to ensure that the dimensional accuracy after processing meets the requirements, the conventional preheating welding method is no longer applicable

Method used

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  • Defect mending method for martensite heat-resistant steel threaded hole
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  • Defect mending method for martensite heat-resistant steel threaded hole

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Embodiment Construction

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

[0019] An embodiment of the present invention provides a method for repairing defects in threaded holes of martensitic heat-resistant steel, comprising the following steps:

[0020] Excavation of defects: use electric tools to grind the defects in the threaded holes to excavate the defects to form welding repair parts 30, and then perform PT inspection on the defect excavation parts. Among them, because it is martensitic steel, electric tools are used to remove defects, instead of pneumatic grinding tools. Because the heat of the gri...

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Abstract

The invention discloses a defect mending method for a martensite heat-resistant steel threaded hole. The method comprises the steps of defect excavation, soldering preheating, soldering, roasting and secondary machining. The defects of conventional preheating welding techniques are overcome, and the mending method for the defects of the threaded hole and the problem of thread tooth breakage in the finishing machining process of martensite heat-resistant steel castings is provided specific to the problems of slag holes and sand holes occurring in the finish machining process of the threaded hole. Through strict welding process control, the welding process comprising the steps of soldering preheating, soldering and roasting is finely controlled to achieve the effect that post-welding heat treatment does not need to be conducted after completion of welding, and the effect that conditions such as cracking, deformation and scrapping do not occur to the welding repair parts can also be ensured.

Description

technical field [0001] The invention relates to the technical field of repairing defects in threaded holes of steel castings, in particular to a method for repairing defects in threaded holes of martensitic heat-resistant steel. Background technique [0002] Martensitic heat-resistant steel is gradually developed on the basis of 9Cr1Mo. Because martensitic steel has good thermal strength, it is mainly used in the manufacture of parts that need to withstand high temperature and high pressure in power generation equipment. The currently widely used martensitic heat-resistant steel has a Cr content of 9% to 13%, and a small amount of Mo, V, W, Nb, and N elements are added, and it is a single martensitic structure at room temperature. Common grades are 9Cr1MoV, 9Cr1Mo1W, T92 / P92 steel, etc. [0003] Martensitic heat-resistant steel has high tensile strength, but poor ductility, high hardness, and small linear expansion coefficient. After the weld pool is solidified, the volum...

Claims

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Application Information

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IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 周辉陈得润雷永红刘振
Owner KOCEL STEEL
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