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Material of throttle valve rod and manufacturing technology

A manufacturing process and throttle valve technology, applied in the field of throttle valve stem manufacturing process, can solve problems such as embrittlement, valve stem micro-cracks, micro-cracks, etc., achieve high product qualification rate, avoid micro-cracks, and improve impact resistance eclipse effect

Inactive Publication Date: 2018-12-07
中石化四机石油机械有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an important part of the throttle valve, the valve stem is responsible for the torsion rod that regulates the flow in the valve body. During the manufacturing process of the valve stem, due to the large hardening tendency of the original material 42CrMo alloy steel, the martensitic transformation temperature is low. A large amount of brittle and hard martensite is easily produced in the quenching zone, resulting in severe embrittlement and even microcracks. Due to the sensitivity to temperature changes and the imprecise manufacturing process, the end of the valve stem is prone to micro Cracks, and cracks occur during use. The valve stem is a welded structure, which is prone to welding defects such as welding cracks.

Method used

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  • Material of throttle valve rod and manufacturing technology

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Effect test

Embodiment 1

[0020] Embodiment 1: Material and production process for the manufacture of φ35×400mm throttle valve stem

[0021] (1) Blanking: According to the size requirements of the product φ35×400mm, the material is 17-4PH stainless steel, and φ40×405mm bar is used for blanking;

[0022] (2) Heat treatment: Heat treatment of stainless steel rods with a size of φ40×405mm and material 17-4PH by solution treatment + intermediate treatment + aging treatment to improve product performance. Solution treatment: Put stainless steel rods into heat treatment Heating in the furnace at 1040°C and holding for 3 hours; intermediate treatment: put the solid solution treated stainless steel rods into 0.8% saline medium and cool to below 120°C; aging treatment: put the intermediately treated stainless steel rods into the heat treatment furnace Heating to 500°C in medium temperature, keeping warm for 2 hours, cooling to 400°C with the furnace, and air cooling to room temperature;

[0023] (3) Machining:...

Embodiment 2

[0027] Embodiment 2: Material and production process for the manufacture of φ30×400mm throttle valve stem

[0028] (1) Blanking: According to the size requirements of the product φ30×400mm, the material is 17-4PH stainless steel, and φ35×405mm bar is used for blanking;

[0029] (2) Heat treatment: Heat treatment of stainless steel rods with a size of φ35×405mm and material 17-4PH by solution treatment + intermediate treatment + aging treatment to improve product performance. Solution treatment: Put stainless steel rods into heat treatment Heating in the furnace to 1040°C and holding for 4 hours; intermediate treatment: put the solid solution treated stainless steel rods into 5% saline medium and cool to below 120°C; aging treatment: put the intermediately treated stainless steel rods into the heat treatment furnace Heating to 500°C in medium temperature, keeping warm for 2 hours, cooling to 400°C with the furnace, and air cooling to room temperature;

[0030] (3) Machining: A...

Embodiment 3

[0034] Embodiment 3: Material and production process for the manufacture of φ60×450mm throttle valve stem

[0035] (1) Blanking: According to the size requirements of the product φ60×450mm, the material is 17-4PH stainless steel, and the φ65×455mm bar is used for blanking;

[0036] (2) Heat treatment: Heat treatment of stainless steel rods with a size of φ65×455mm and material 17-4PH by solution treatment + intermediate treatment + aging treatment to improve product performance. Solution treatment: Put stainless steel rods into heat treatment Heating in the furnace at 1040°C and keeping it warm for 6 hours; intermediate treatment: put the solid solution treated stainless steel bar into 10% brine medium and cool it below 120°C; aging treatment: put the intermediately treated stainless steel bar into the heat treatment furnace Heating to 500°C in medium temperature, keeping warm for 2 hours, cooling to 400°C with the furnace, and air cooling to room temperature;

[0037] (3) Ma...

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Abstract

The invention provides a material of throttle valve rod and manufacturing technology, and relates to throttle valve rod manufacturing technology. The material of throttle valve rod is the throttle valve rod provided with an integral structure and manufactured by machining of stainless steel, and brass powder is adopted to carry out thermal spraying on the surface of the end heads of the throttle valve rod. The manufacturing technology comprises the steps that material preparation is carried out, thermal treatment is carried out, machining is carried out, the thermal spraying is carried out, finish machining is carried out and flaw detection is carried out. The throttle valve rod with the integral structure is manufactured by adopting the stainless steel material to replace original alloy steel materials, the technology is rigorous, the end heads of the throttle valve rod without micro-crack can be realized, erosion resistance and abrasion resistance of products are improved, and the quality and yield of the products are guaranteed.

Description

Technical field: [0001] The invention relates to a manufacturing process of a valve stem of a throttle valve. Background technique [0002] The throttle valve is an important part of the high-pressure manifold, which can realize the adjustment of the flow rate in the high-pressure manifold. As an important part of the throttle valve, the valve stem is responsible for the torsion rod that regulates the flow in the valve body. During the manufacturing process of the valve stem, due to the large hardening tendency of the original material 42CrMo alloy steel, the martensitic transformation temperature is low. A large amount of brittle and hard martensite is easily produced in the quenching zone, resulting in severe embrittlement and even microcracks. Due to the sensitivity to temperature changes and the imprecise manufacturing process, the end of the valve stem is prone to micro Cracks, and cracking occurs during use. The valve stem is a welded structure, which is prone to weld...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/001
Inventor 杨明明荀永明
Owner 中石化四机石油机械有限公司