Hypoeutectic high-chromium cast iron for slurry pump blade and heat treatment process

A high-chromium cast iron and processing technology, which is applied in the field of hypoeutectic high-chromium cast iron and heat treatment processing technology for slurry pump blades, can solve problems such as poor toughness, pits on the cross-section, and material falling off on the surface of the impeller.

Inactive Publication Date: 2012-07-11
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although ordinary high-chromium white cast iron has high wear resistance, its toughness is poor, and it is easy to cause the surface material of the impeller to fall off when it is subjected to high-speed erosion of large solid particles, and it is easy to form pits due to corrosion on the section

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the mass percentage content, the weight percentages of the components are: C2.7%, Cr26.5%, Si0.6%, Mn0.4%, Ni0.3%, Mo0.15%, Cu0.03%, P0. 02%, S0.02%, and the balance is Fe.

[0022] 1) Smelting: first use scrap steel, pig iron with low silicon content, high-carbon ferromanganese, electrolytic copper, and pure nickel into the electric furnace for smelting, and the temperature rises to 1550 degrees. Baking temperature is 1460 degrees. The pouring temperature is 1400 degrees.

[0023] 2) Modification treatment: use Re-V-Ti-Bi-Mg composite modifier to compound modification of molten iron. The total mass fraction of the composite modificator is 1.4%. Among them, Re accounted for 0.8% by mass, V accounted for 0.1%, Ti accounted for 0.2%, Bi accounted for 0.1%, and Mg accounted for 0.2%. The modificator is added during the pouring process by the flow method.

[0024] 3) Shot blasting treatment: surface cleaning and strengthening of blades.

[0025] 4) Stress...

Embodiment 2

[0028] According to the mass percentage content, the weight percentages of the components are: C2.6%, Cr28%, Si0.5%, Mn0.3%, Ni0.2%, Mo0.1%, Cu0.02%, P0.03% , S0.03%, and the balance is Fe.

[0029] 1) Smelting: first use scrap steel, pig iron with low silicon content, high-carbon ferromanganese, electrolytic copper, and pure nickel into the electric furnace for smelting, and the temperature rises to 1500 degrees. Baking temperature is 1440 degrees. The pouring temperature is 1380 degrees.

[0030] 2) Modification treatment: use Re-V-Ti-Bi-Mg composite modifier to compound modification of molten iron. The total mass fraction of the composite modificator is 1.2%. Among them, Re accounted for 0.6% by mass, V accounted for 0.1%, Ti accounted for 0.2%, Bi accounted for 0.1%, and Mg accounted for 0.2%. The modificator is added during the pouring process by the flow method.

[0031] 3) Shot blasting treatment: surface cleaning and strengthening of blades.

[0032] 4) Stress re...

Embodiment 3

[0035] According to the mass percentage content, the weight percentages of the components are: C2.8%, Cr30%, Si0.7%, Mn0.6%, Ni0.4%, Mo0.2%, Cu0.04%, P0.04% , S0.04%, and the balance is Fe.

[0036] 1) Smelting: first use scrap steel, pig iron with low silicon content, high-carbon ferromanganese, electrolytic copper, and pure nickel into the electric furnace for smelting, and the temperature rises to 1600 degrees. Baking temperature is 1480 degrees. The pouring temperature is 1420 degrees.

[0037]2) Modification treatment: use Re-V-Ti-Bi-Mg composite modifier to compound modification of molten iron. The total mass fraction of the composite modificator is 2.0%. Among them, Re accounts for 0.9% by mass, V accounts for 0.2%, Ti accounts for 0.4%, Bi accounts for 0.2%, and Mg accounts for 0.3%. The modificator is added during the pouring process by the flow method.

[0038] 3) Shot blasting treatment: surface cleaning and strengthening of blades.

[0039] 4) Stress relief a...

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Abstract

The invention discloses hypoeutectic high-chromium cast iron for a slurry pump blade and a heat treatment process. The cast iron comprises chemical components by weight percentage: 2.6-2.8 percent of C, 26-32 percent of Cr, 0.5-0.7 percent of Si, 0.3-0.6 percent of Mn, 0.2-0.4 percent of Ni, 0.1-0.2 percent of Mo, 0.02-0.04 percent of Cu, less than or equal to 0.05 percent of P, less than or equal to 0.05 percent of S and Fe in balancing amount. The heat treatment process comprises the following steps: smelting the cast iron in an electric furnace; performing composite modification treatment on the molten iron by using a Re-V-Ti-Bi-Mg compound modifier; performing pilling treatment; performing stress relief annealing; machining; and quenching and tempering; a carbide can be changed in form into dispersed masses, so as to reduce the fragmentation effect on a substrate material; and an impeller product of a slurry pump, with high performances and a long service life, can be obtained.

Description

technical field [0001] The invention relates to a special hypoeutectic high-chromium cast iron in the field of slurry pump blade manufacturing and a heat treatment process. Background technique [0002] Slurry pumps are widely used in industries such as electric power, coal mines and metallurgy to transport solid-liquid mixtures containing hard particles. Most of the slurry pump products are centrifugal slurry pumps, and their working principle is the same as that of centrifugal clean water pumps. The working medium of the slurry pump is a solid-liquid mixture composed of solid materials with a certain particle size, hardness and concentration and water, such as mud, ore pulp and mortar. Working under the ground not only bears the erosion and wear of materials, but also bears the corrosive effect of slurry, and the working conditions are extremely harsh. Severe wear is the biggest long-standing problem of slurry pumps, and it is also the main direction of scientific resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C21D5/00C21D1/30C21D1/18
Inventor 刘煜钟彦宇夏卿坤何航敏王带丽朱先旺郭强彭玲
Owner CHANGSHA UNIVERSITY
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