A pump casing, pump seat, impeller or pump cover ductile iron casting and its casting process used in the petroleum industry

A technology of petroleum industry and casting process, applied in the fields of casting process and mechanical processing and manufacturing, can solve the problem of high production cost, achieve the effect of improving wear resistance, optimizing the casting process reasonably, and increasing the pearlite content

Inactive Publication Date: 2016-02-17
SICHUAN XIANGYE MASCH CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above process saves the cost of heat treatment, because copper and tin are precious metals, the production cost is still high and cannot meet the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Ductile iron castings consist of the following components in weight percentages:

[0021] Carbon: 3.5-3.7, silicon 2.0-2.4, manganese 0.4-0.8, sulfur ≤ 0.04, phosphorus ≤ 0.06, chromium 0.15-0.25; the rest is Fe.

[0022] Taking the pump casing, pump seat, impeller, pump cover and other series of ductile iron castings of Chengdu Western Petroleum Company as an example, the wall thickness range of the castings is 10mm-25mm, the weight range is 7Kg-140Kg, and its composition is the weight percentage listed in Table 1 below content.

[0023] Table 1

[0024] the element

[0025] The rest is Fe.

Embodiment 2

[0027] The smelting and preparation process of ductile iron castings takes the pump casing, pump seat, impeller, pump cover and other castings of Chengdu Western Petroleum Company as an example. Weight range 7Kg-140Kg.

[0028] The order of charging before the furnace: pig iron→scrap steel→return charge→chromium. In this example, ferrochromium FeCr55C0.25 is used for adding chromium, which is added before the molten iron is spheroidized.

[0029] The chromium-containing raw material ferrochrome conforms to the low-carbon ferrochrome grade FeCr55C0.25I grade in (GB / T5683-2008), and its composition conforms to the following table 2 weight percentage content:

[0030] Table 2

[0031] the element

Cr

C

Si

P

S

Fe

％

≥60

≤0.25

≤2.0

≤0.04

≤0.03

margin

[0032] When the temperature of molten iron reaches 1420°C, samples are taken in front of the furnace for spectral analysis, and the chemical composition is adjust...

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PUM

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Abstract

The invention discloses a ductile iron casting and the casting process thereof. The ductile iron casting comprises the following components according to weight percent: 3.5 to 3.7 percent of carbon, 2.0 to 2.4 percent of silicone, 0.4 to 0.8 percent of manganese, 0.04 or less than 0.4 percent of sulfur, 0.06 or less than 0.06 percent of phosphorus and 0.15 to 0.25 percent of chromium, and the rest is Fe. The preparing process of the ductile iron casting comprises the steps of smelting, balling, breeding, molding and detecting. According to the invention, chemical composition of casting is improved, the chromium is used for replacing precious metal copper and tin, the content of pearlite is also increased, the wearing resistance of the casting is improved, heat treatment is not required, that the requirements of a special petroleum pump for petroleum enterprises are met is detected, due to the improvement to matching components, the smelting and casting process of the invention is enabled to be more reasonable, the smelting cost is lower, the self feeding capacity of the casting is excellent, and dense tissue can be obtained easily after cooling.

Description

technical field [0001] The invention belongs to the field of mechanical processing and manufacturing, in particular to the technical field of casting technology; in particular, it relates to a series of ductile iron castings applied to pump casings, pump seats, impellers, pump covers and the like and their casting technology. Background technique [0002] The series of ductile iron castings such as pump casings, pump seats, impellers, and pump covers used by oil companies are made of QT600-3. According to the traditional casting process, the ductile iron casting QT600-3 is cast through heat treatment and normalizing to improve the pearlite in the matrix to meet the performance requirements. In order to save the cost of heat treatment, the existing technology is to add copper and tin to the batching before the furnace when producing the above castings. Due to the addition of copper and tin, the as-cast pearlite content of ductile iron castings is increased, so that it can me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/06C22C37/04C22C33/10C21C1/10
CPCY02P10/20
Inventor 谢许祥欧廷平尹华元
Owner SICHUAN XIANGYE MASCH CASTING CO LTD
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