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Method for improving wear resistance of high-chromium cast-iron alloy by adopting microalloying engineering

A technology of micro-alloying and high-chromium cast iron, which is applied in the field of metallurgical casting to achieve the effects of improving product yield, solving the problem of high brittleness of castings, and reducing the cost of charge

Active Publication Date: 2020-07-17
河北高新泵业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous literature, the research on microalloying elements on high chromium cast iron was mostly limited to the alloying and deterioration of high chromium cast iron, mainly to improve the morphology of eutectic carbides, but for the microalloying engineering to improve the high chromium cast iron No research on wear resistance of cast iron

Method used

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  • Method for improving wear resistance of high-chromium cast-iron alloy by adopting microalloying engineering
  • Method for improving wear resistance of high-chromium cast-iron alloy by adopting microalloying engineering
  • Method for improving wear resistance of high-chromium cast-iron alloy by adopting microalloying engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Utilize micro-alloying engineering to improve the method for BTMCr15Mn3Cu1 (GX15) alloy wear resistance, comprising the following steps:

[0039] (1) According to the following components 2.7-2.9wt%C, 0.4-0.7wt%Si, 2.4-3.0wt%Mn, 15-18wt%Cr, 0.9~1.1wt%Cu, <0.06wt%S, <0.10wt% %P, 0.07wt%B, and the balance is Fe. Weigh the raw materials and place them in an induction furnace, heat up until the raw materials are completely melted, remove impurities, and obtain molten iron;

[0040] (2) Taking molten iron as the measurement basis, 0.2wt% aluminum, 1.0wt% zinc-copper alloy (copper 87wt%, zinc 13wt%) and 0.3wt% YBTW-4 refining, 0.2wt% No. 2 rare earth ferrosilicon alloy mixed as a modifier;

[0041] (3) After adding the modificator in the step (2) into the ladle, pour the molten iron in the step (1) into the ladle, stir, remove slag, and pour at 1380-1410° C.;

[0042] (4) After pouring, the casting is kept at 650°C for 5 hours, then raised to 920°C for 2 hours, and finally ...

Embodiment 2

[0049] On the basis of Example 1, Example 2 is carried out in order to further improve the morphology of eutectic carbides and increase the hardness of GX15. The steps are as follows:

[0050] (1) Melting qualified molten iron to form GX15;

[0051] (2) Add composite modificator 0.2% Al+0.1% copper-zinc alloy+0.13wt% YBTW-2 alloy in step (1) to carry out pre-furnace treatment, pour guard plate;

[0052] (3) Carry out the pretreatment of the protective plate prepared in step (2) at 650° C. for 5.0 hours;

[0053] (4) The guard plate treated in step (3) is subjected to a microalloying-austenitizing treatment at 920° C. for 2 hours → 950° C. for 8 hours, and air-cooled after being taken out of the furnace.

[0054] The guard plate obtained after the above treatment, the produced GX15 material guard plate, the macro hardness (HRC) of factory inspection: 66.8, 64.7, 62.6, compared with the hardness of 59.4HRC of the factory inspection guard plate produced in Example 1, at least i...

Embodiment 3

[0058] The GX15 material that the method for embodiment 1 is produced is carried out abrasion test on abrasion testing machine:

[0059] Abrasion test model: MSH-120;

[0060] Number of rotations: 2790 rpm;

[0061] Abrasion sample: Standard abrasion testing machine abrasion disc;

[0062] Medium: quartz sand, particle size 20-40, mixing ratio 40% (2kg sand: 3kg water);

[0063] Abrasion test time: 8h.

[0064] The test results are shown in Table 1.

[0065] Table 1 Comparison of abrasion test results between GX15 and A05

[0066]

[0067] It can be seen from Table 1 that the abrasive rate of GX15 is 0.605%, which is lower than that of A05, which is 0.678%, and its abrasive rate coefficient is 0.89. Since the smaller the coefficient of abrasion rate, the higher the abrasion resistance, the abrasion resistance of GX15 material is higher than that of A05 material.

[0068] The GX15 material prepared by the method in Example 1 is used to make the impeller and rear guard ...

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Abstract

The invention discloses a method for improving the wear resistance of a high-chromium cast-iron alloy by adopting microalloying engineering. The method is characterized in that 0.10 to 0.25 percent ofaluminum, 1.0 percent of copper-zinc alloy and a rare-earth alloy serving as a modifier is subjected to pearlite transformation pretreatment during which heat is preserved at a temperature of 650 DEGC for 5 hours and austenitizing-microalloying heat treatment system treatment during which heat is preserved at a temperature of 920 DEG C for 2 hours and heat is preserved at a temperature of 950 DEG C for 8 to 10 hours in order to refine elements of a eutectic carbide, improve the form of an as-cast eutectic carbide, improve the product yield and solve the problem of high casting brittleness ofthe high-chromium cast-iron alloy. Moreover, the grain boundary character distribution is optimized to obtain sigma1 lath martensite with a low-angle boundary, so that the wear resistance of the alloy is improved; the precipitation amount of a secondary carbide in a substrate is increased in the grain boundary optimization process; the carbon content of austenite is lowered; the transformation amount of the lath martensite is increased; the toughness of a material is improved; and the wear resistance of the material is improved remarkably.

Description

technical field [0001] The invention relates to the technical field of metallurgical casting, in particular to a method for improving the wear resistance of high-chromium cast iron alloys by adopting micro-alloying engineering. Background technique [0002] Cr15 high chromium cast iron was first developed by Climax (Climax) Molybdenum Industry Company in the United States. The Mo content in its composition is 3%, and it has become the most famous Cr15Mo3 anti-wear white cast iron. The cast iron brand is in In my country, it was first applied by Shenyang Foundry Research Institute and Shijiazhuang Water Pump Factory in the 1980s, and it was applied to the manufacture of impurity pump flow components. However, in the composition of Cr15Mo3 anti-wear white cast iron, due to the high content of Mo, the cost of the alloy is also high, so the technical scheme of Cr15 high chromium cast iron with manganese substituted for molybdenum has been successively studied. This research was c...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/08C21D1/00C21D5/00C22C37/06C22C37/10
CPCC22C33/08C21C1/08C21D1/00C21D5/00C22C37/10C22C37/06
Inventor 张山纲
Owner 河北高新泵业有限公司
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