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Material of thrust plate for plunger pump, and heat treatment technology thereof

A valve plate, plunger pump technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of high material cost and long heat treatment time, achieve fine and uniform organization, prolong service life, The effect of improving strength and hardness

Active Publication Date: 2013-08-14
龙工(上海)精工液压有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it also has the disadvantages of high material cost and long heat treatment time.

Method used

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  • Material of thrust plate for plunger pump, and heat treatment technology thereof
  • Material of thrust plate for plunger pump, and heat treatment technology thereof
  • Material of thrust plate for plunger pump, and heat treatment technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] 1. Weigh C0.35wt%, Si0.14wt%, Mn0.56wt%, Cr1.36wt%, Cu0.25wt%, Al1.1wt%, and the rest of Fe.

[0023] 2. If figure 1 As shown, the heat treatment process diagram for the material (PLP) of the plunger pump valve plate provided by the present invention, the specific steps of the heat treatment process are as follows:

[0024] The first step: put each raw material in the container in proportion, vacuumize the container, and fill it with nitrogen;

[0025] The second step: heat the mixture obtained in the first step to 340°C and keep it warm for 40 minutes;

[0026] The third step: heating the mixture obtained in the second step to 580° C., while feeding ammonia, carbon dioxide and nitrogen;

[0027] The fourth step: keep the mixture obtained in the third step at 580°C for 450 minutes, and at the same time pass through ammonia, carbon dioxide and nitrogen to carry out a stage of nitriding;

[0028] The fifth step: keep the mixture obtained in the fourth step at 580°C for...

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Abstract

The invention discloses a material of a thrust plate for a plunger pump, and a heat treatment technology of the material. The material of the thrust plate for the plunger pump is characterized by comprising raw materials: 0.35-0.42wt% of C, 0.14-0.3wt% of Si, 0.3-0.6wt% of Mn, 1.35-1.65wt% of Cr, 0.1-0.3wt% of Cu, 0.7-1.1wt% of Al and the balance of Fe. The heat treatment comprises the following steps of: putting all the raw materials into a container for vacuumizing, and filling nitrogen into the container; heating up to 340 DEG C, and carrying out heat preservation; heating up to 580 DEG C,and filling the nitrogen, ammonia and carbon dioxide into the container; carrying out first-section nitriding and second-section nitriding; cooling to 80 DEG C, and carrying out heat preservation; and after that, tapping. According to the invention, compared with the prior art, Cu is added, Mo is removed, the strength and hardness of the material are improved; and due to the lubrication function,the wear-resisting property is improved; therefore, the service lives of parts can be prolonged, and the production cost is saved.

Description

technical field [0001] The invention relates to a material for a flow distribution plate of a plunger pump, belonging to the technical field of engineering materials. Background technique [0002] The pump cylinder and valve plate of various high-pressure plungers are generally made of copper alloy and nitrided alloy steel. The friction pair between the two is one of the three important friction pairs of the entire plunger pump. During the use of the plunger pump, the valve plate is subjected to high temperature, high pressure and impact, so the surface of the valve plate is required to have high strength, high hardness, high wear resistance and certain toughness. [0003] At present, most of the valve plates used in high-tonnage plunger pumps on the market are used for nitriding with 38CrMoAl. The advantage is that they can obtain excellent comprehensive mechanical properties after quenching and tempering and nitriding. The nitriding layer has good wear resistance and fati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C23C8/26
Inventor 陈超汪锋赵宁鲁启立
Owner 龙工(上海)精工液压有限公司
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