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Treatment process of valve rod of valve

A treatment process and valve stem technology, which is applied in the field of valve stem treatment process, can solve the problems of long nitriding cycle, difficult quality assurance, high cost, etc., and achieve the effects of improving production efficiency, shortening production cycle and reducing costs

Inactive Publication Date: 2017-06-20
SHANGHAI YUANGAO VALVE IND (GRP) CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a valve stem treatment process. By subjecting the valve stem after solid solution heat treatment to cryogenic treatment, the existing valve stem nitriding (nitriding) heat treatment nitrogen cost is high and nitriding The cycle is long, and the problem of quality assurance is difficult

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  • Treatment process of valve rod of valve
  • Treatment process of valve rod of valve

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Embodiment 1

[0022] A valve stem treatment process, including the valve stem, wherein the valve stem material is F304 (0Gr18Ni9) austenitic stainless steel, the valve stem material is subjected to solid solution heat treatment, and then placed in a cryogenic bath at -196°C Liquid nitrogen was sent for cryogenic treatment.

[0023] Such as figure 1 As shown, the cryogenic treatment process steps are:

[0024] 1. Wipe the outer surface of the valve stem with Bing copper, so that the outer surface of the valve stem is free of moisture and debris;

[0025] 2. Place the valve stem in the cryogenic tank, and the gap between two adjacent valve stems is 10mm;

[0026] 3. Close the cryogenic cover and seal it;

[0027] 4. Turn on the liquid nitrogen switch, start delivering liquid nitrogen, and check the instrument thermometer;

[0028] 5. When the instrument thermometer reaches -190 degrees, the surface of the workpiece begins to emit white bubbles. After the bubbles are full, keep warm for 2...

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Abstract

The invention relates to a treatment process of a valve rod of a valve. The valve rod of the valve is included. A material of the valve rod of the valve is F304 austenitic stainless steel, the material of the valve rod of the valve is subject to solution heat treatment, then liquid nitrogen is fed in a copious cooling groove at -196 DEG C, and copious cooling treatment is carried out. According to the treatment process, the copious cooling technology is innovated, the strength of the austenitic stainless steel valve rod is improved, the service life of the austenitic stainless steel valve rod is prolonged, cost is reduced, the production efficiency is improved, the production period is shortened, the problems in small-batch single-piece production is solved, copious cooling of the valve rod is achieved, and the natural color of the stainless steel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of valve stems, and in particular relates to a valve stem treatment process. Background technique [0002] Corrosion-resistant chemical valve stems require austenitic stainless steel F304 (0Cr18Ni9) material, which has low rigidity δ0.2=205Mpa. This is a rigidity problem. Conventional process: first do solution heat treatment. The hardness reaches HB139-187, and then the nitriding (nitriding) heat treatment process, such as figure 2 shown. Because the valve industry is produced in small batches and single pieces, and the cost of nitriding is calculated according to the furnace, the cost of nitriding (often producing several units at a time) is high, the nitriding cycle is long, and quality assurance is difficult. The traditional treatment process increases the unit product cost (if several units are produced at a time, it is impossible to talk about the valve profit) and production needs, in order to redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/04C21D9/00
CPCC21D6/04C21D9/0068
Inventor 李炜张耀武张小明杜文明
Owner SHANGHAI YUANGAO VALVE IND (GRP) CO LTD
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