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Valve, and welding method of valve body

A valve body and welding process technology, applied in the field of valve body welding process of F91 material, can solve problems such as cracks on the sealing surface, and achieve the effect of improving hardenability

Active Publication Date: 2014-06-04
NANTONG STATE ELECTRIC POWER VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a valve body welding method to solve the problem of cracks in the sealing surface of the F91 valve body after welding in the past

Method used

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Embodiment Construction

[0033] In order to further illustrate the manufacturing process of the present invention and the advantages obtained by using the manufacturing method, a further description will be made below in conjunction with the accompanying drawings.

[0034] First of all, let's talk about the characteristics of F91 steel:

[0035] The material of F91 steel is Cr9Mo1V steel, which belongs to martensitic heat-resistant steel. The main elements in the steel are:

[0036] (1) Vanadium element can improve room temperature, medium temperature strength and thermal strength, increase the structural stability of steel at high temperature, and improve the welding performance of low carbon alloy steel.

[0037] (2) Chromium can improve the oxidation resistance, corrosion resistance and high temperature strength of steel.

[0038] (3) The molybdenum element mainly improves the strength and inhibits the hot brittleness tendency of chromium steel.

[0039] 1. Chemical composition:

[0040]

[0...

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Abstract

The invention relates to a welding method of a valve body, in particular to a valve body welding process of an F91 material, aiming at providing a method for welding the valve body and solves the problem that a crack is generated after a sealing face of a previous F91 valve body is welded. The welding method of the valve body is realized as follows: the welding process of a F91 material valve body sealing face is characterized by comprising the steps of driving a total process of welding the valve body and welding a valve clack. Aiming to solve the second invention problem, the valve body of F91 welding is provided to solve the phenomenon that the F91 welding valve body is easy to crack.

Description

technical field [0001] The invention relates to a valve body welding method, in particular to a valve body welding process made of F91 material. Background technique [0002] The material of F91 steel is Cr9Mo1V steel, which belongs to martensitic heat-resistant steel. The main elements in the steel: (1) Vanadium element can improve the strength and thermal strength at room temperature and medium temperature, increase the structural stability of steel at high temperature, and improve the low carbon Weldability of alloy steel. [0003] (2) Chromium can improve the oxidation resistance, corrosion resistance and high temperature strength of steel. [0004] (3) The molybdenum element mainly improves the strength and inhibits the hot brittleness tendency of chromium steel. F91 steel has a large hardening tendency and cold cracking tendency, and cold cracks and hot cracks may occur during welding; F91 steel is a medium alloy steel with high alloy content, and the content of Cr a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K31/02F16K27/00
Inventor 徐永明胡永祥赵怀忠郭玉林朱祥
Owner NANTONG STATE ELECTRIC POWER VALVE