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Carburization and QPQ treatment complex technique and application thereof

A composite process and carburizing technology, which is applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve the problems of not being able to use acid fracturing, brittleness, and insufficient strength of the valve body, and achieve cost reduction. Low, increase toughness, ensure the effect of product strength and toughness

Pending Publication Date: 2019-10-22
安徽聚力石油钻采设备科技有限公司
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Problems solved by technology

[0005] Aiming at the defects and deficiencies in the prior art, the present invention proposes a composite process of carburizing and QPQ treatment and its application, which solves the problems of insufficient strength, fragility, and inability to use the existing valve body during use. Technical issues such as acid fracturing

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  • Carburization and QPQ treatment complex technique and application thereof

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Embodiment 1

[0021] A composite process of carburizing and QPQ treatment, comprising the steps of:

[0022] a. The valve body workpiece processed by low-carbon alloy steel is selected, and the valve body workpiece is used in the hydraulic end of the fracturing vehicle in oil drilling and production.

[0023] b. Put the workpiece in step a into the carburizing furnace for deep carburizing treatment. The temperature is 930°C. When solid carburizing is used, the carburizing agent should be used in a new and old ratio. The carburizing agent is BaCO3, and its dosage is 5%. ;During carburizing treatment, do not heat rapidly, and strictly control the uniform furnace temperature to prevent the product from having too high or too low a carbon concentration. matter or network carbide. Due to the formation of this hard and brittle structure, the toughness of the carburized layer drops sharply. And high carbon martensite is formed during quenching, and grinding cracks are prone to appear during grin...

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Abstract

The invention discloses a carburization and QPQ treatment complex technique and application thereof, and belongs to the technical field of valve body heat treatment. The technique comprises the stepsthat a. a workpiece made of low-carbon alloy steel is selected; b. the workpiece in the step a is put into a carburizing furnace to be subjected to deep carburization treatment, the temperature is 920-940 DEG C, and 4-7% of BaCO<3> is adopted as an energizer; c. quenching is conducted, the core hardness of the quenched workpiece is guaranteed to be HRC 34-40, the surface hardness is HRC 59-62, andthe carburization depth is 2.2-2.5 mm; d. tempering is conducted twice at the temperature of 180 DEG C; and e. QPQ salt bath complex technological treatment is conducted. The complex technique is applied to valve bodies and valve seats adopted by petroleum drilling and natural gas drilling. The technical problems that the strength of an existing valve body is not enough in the using process, an carburization layer is uneven, and the valve body is prone to shattering and cannot be used for acid fracturing are solved.

Description

technical field [0001] The invention belongs to the technical field of low-carbon alloy steel valve body heat treatment, and in particular relates to a composite process of carburizing and QPQ treatment and its application. Background technique [0002] In oil and natural gas drilling and production equipment, the valve body at the hydraulic end of the fracturing vehicle is prone to problems such as fragmentation, insufficient strength, and corrosion by fracturing fluid during use. This is due to the fact that the traditional valve body adopts conventional carburizing treatment in the heat treatment process, but the internal stress of the treated workpiece cannot be completely released, which still cannot meet the core hardness required for the valve body to work, and the valve body has a harsh working environment. It is easy to be corroded, and it needs to reciprocate during work and the valve body seat will be constantly impacted and worn. [0003] Valve bodies generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/66C21D1/18C23C8/56
CPCC23C8/66C21D1/18C23C8/56
Inventor 杨维庆杨维顺
Owner 安徽聚力石油钻采设备科技有限公司
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