Valve seat face surfacing technology

A valve sealing and surface stacking technology, applied in valve devices, engine components, mechanical equipment, etc., can solve the problems of small linear expansion coefficient, high strength, different thermal expansion coefficients, etc., and achieve strong corrosion resistance and good material plasticity. Effect

Inactive Publication Date: 2015-04-22
NANTONG LONGYUAN POWER STATION VALVE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the linear expansion coefficient of Stellite alloy is different from that of the parent material. The Stellite alloy material has high strength, small linear expansion coefficient and poor plasticity. The two materials are combined by surfacing welding.
Due to the large amou

Method used

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Embodiment Construction

[0014] The valve sealing surface surfacing welding process of the present invention comprises the following steps:

[0015] In the first step, the base material of the valve seat and the valve core of the valve to be processed is rough-turned by a lathe to form the rough-machined size before welding.

[0016] In the second step, austenitic stainless steel is surfacing on the base material of the valve seat and valve core after rough turning to form a stainless steel transition layer.

[0017] The third step is to place the valve seat and valve core of the valve after surfacing on the lathe, and lathe the surfacing stainless steel layer on the valve seat of the valve.

[0018] The thickness of the stainless steel transition layer after leveling is 1-1.5mm.

[0019] The fourth step is to surfacing Stellite alloy on the surface of the stainless steel layer of the valve seat to form a layer of Stellite alloy layer, which is the sealing surface of the valve seat.

[0020] The thi...

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Abstract

The invention relates to a valve seat face surfacing technology. The technology comprises the steps of performing rough turning on a valve seat and a valve core base material of a valve to be machined through a lathe to form the rough machining size before welding; surfacing austenitic stainless steel on the rough turned valve seat and valve core base material of the valve to form a stainless steel transition layer; putting the surfaced valve seat and valve core base material of the valve on the lathe, and turning the surfaced stainless steel layer on the valve seat of the valve flat; surfacing Stellite alloy on the valve seat stainless steel surface to form a Stellite alloy layer, which is the valve seat seal face; tempering the Stellite alloy surfaced valve seat and valve core. The surfacing technology has the advantages that the austenite stainless steel layer which is high in corrosion resistance and good in material plasticity is stacked on the valve seat to serve as the transition layer, and Stellite alloy is surfaced on the transition layer, accordingly, the surfacing yield reaches more than 98%.

Description

technical field [0001] The invention relates to the field of valve manufacturing, in particular to a valve sealing surface surfacing welding process. Background technique [0002] As the sealing surface of high-temperature and high-pressure valves, a layer of Stellite alloy is generally used to weld a layer of Stellite alloy on the base metal of carbon steel, high-chromium steel, and medium-chromium-molybdenum steel. Stellite alloy has good corrosion resistance, heat resistance, and wear resistance. And high temperature anti-oxidation, anti-cavitation ability. However, the linear expansion coefficient of the Stellite alloy is different from that of the parent material. The Stellite alloy material has high strength, a small linear expansion coefficient, and poor plasticity. The two materials are combined by surfacing. Due to the large amount of heat generated during the welding process, the material expands with heat and contracts with cold. The thermal expansion coeffic...

Claims

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Application Information

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IPC IPC(8): F16K51/00
CPCB23P15/001
Inventor 吴振宇
Owner NANTONG LONGYUAN POWER STATION VALVE
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