CN113388758A

CN113388758A - High-temperature corrosion resistant and long-service-life hard alloy shaft sleeve

Info

Publication number: CN113388758A
Application number: CN202110601333.XA
Authority: CN
Inventors: 谭兴海; 郝荣亮; 陈其汉; 陈永进; 高明; 洪昌华
Original assignee: Wuhu Sheda Laser Technology Co ltd
Current assignee: Wuhu Sheda Laser Technology Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-09-14

Abstract

The invention relates to a hard alloy shaft sleeve, in particular to a hard alloy shaft sleeve with high temperature corrosion resistance and long service life. The hard alloy shaft sleeve consists of the following components: less than 2% of C, 10-35% of Cr, less than 5% of Si, 0-16% of W, 1-4% of Fe, 1-30% of Mo, 1-4% of Ni, less than 2% of Mn and the balance of Co. According to the invention, through scientific and reasonable proportioning of the components, the service life of the obtained hard alloy shaft sleeve is more than 25 days in a zinc liquid corrosion environment at 480 ℃. The hard alloy shaft sleeve prepared by the method has good wear resistance and corrosion resistance, and the service life is obviously prolonged.

Description

High-temperature corrosion resistant and long-service-life hard alloy shaft sleeve

Technical Field

The invention relates to a hard alloy shaft sleeve, in particular to a hard alloy shaft sleeve with high temperature corrosion resistance and long service life.

Background

The cobalt-based hard alloy has the advantages of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly high hardness and wear resistance, basically keeps unchanged even at the temperature of 500 ℃, and still has high hardness at the temperature of 1000 ℃.

The shaft sleeve is an important consumption part in the continuous hot galvanizing production of strip steel, and mainly has the function of reducing the abrasion of the roll shaft so as to reduce the replacement frequency of the roll shaft. Therefore, the roll sleeve of the zinc pot needs to have the characteristics of high hardness, high wear resistance and high temperature resistance and molten metal corrosion resistance. At present, stainless steel shaft sleeves are generally adopted for zinc pot roller shaft sleeves, and abrasion-resistant and corrosion-resistant coatings are prepared on the surfaces of the stainless steel shaft sleeves, so that the shaft sleeves are complex in preparation process.

Disclosure of Invention

The invention uses cobalt-based high-chromium alloy material to prepare the shaft sleeve to obtain the hard alloy shaft sleeve with high temperature corrosion resistance and long service life.

The hard alloy shaft sleeve comprises the following components in percentage by mass: less than 2% of C, 10-35% of Cr, less than 5% of Si, 0-16% of W, 1-4% of Fe, 1-30% of Mo, 1-4% of Ni, less than 2% of Mn and the balance of Co.

On the basis of the mass fraction of the shaft sleeve components, in order to meet the corrosion resistance requirement, the sum of the mass fractions of Ni and Fe needs to be controlled to be less than 5 percent.

In order to balance the wear resistance and the cost, the hard alloy shaft sleeve with two grades of hardness can be selected:

the hardness of the first hard alloy shaft sleeve is 50-65 HRC, on the basis of the mass fraction of the shaft sleeve components, 10-20% of Cr, 20-30% of Mo and W is less than 5%;

the hardness of the second-grade hard alloy shaft sleeve is 40-50 HRC, and on the basis of the mass fraction of the shaft sleeve components, 20-35% of Cr, less than 5% of Mo and 5-16% of W are contained.

The working surface of the hard alloy shaft sleeve with high temperature corrosion resistance and long service life is a cylindrical surface, and the corresponding wall thickness of the working surface is greater than 7.5 mm.

The hard alloy shaft sleeve with high temperature corrosion resistance and long service life is prepared by the procedures of electric furnace smelting, centrifugal casting, heat preservation annealing, machining and the like.

The hard alloy shaft sleeve is a cobalt-based high-chromium alloy shaft sleeve and has excellent wear resistance. The alloy shaft sleeve can keep good abrasion resistance at high temperature by taking cobalt as a main component. And Cr in the alloy mainly plays a role in corrosion resistance, so that the hard alloy has stronger corrosion resistance.

Detailed Description

(example 1)

The hard alloy shaft sleeve comprises the following components in percentage by mass: the alloy is prepared from 1% of C, 25% of Cr, 2% of Si, 9% of W, 2% of Fe, 3% of Mo, 2% of Ni, 1% of Mn and the balance of Co through the working procedures of electric furnace smelting, centrifugal casting, heat preservation annealing, machining and the like, wherein the working surface is a cylindrical surface, and the wall thickness corresponding to the working surface is 15 mm.

(example 2)

The hard alloy shaft sleeve comprises the following components in percentage by mass: 1.4 percent of C, 17 percent of Cr, 3 percent of Si, 15 percent of W, 1 percent of Fe, 24 percent of Mo, 2.5 percent of Ni, 1 percent of Mn and the balance of Co, and the alloy is prepared by the working procedures of electric furnace smelting, centrifugal casting, heat preservation annealing, machining and the like, wherein the working surface is a cylindrical surface, and the wall thickness corresponding to the working surface is 15 mm.

(example 3)

The hard alloy shaft sleeve comprises the following components in percentage by mass: the alloy is prepared from 1.3% of C, 15% of Cr, 4% of Si, 3% of W, 1.5% of Fe, 30% of Mo, 1.5% of Ni, 1.5% of Mn and the balance of Co through the procedures of electric furnace smelting, centrifugal casting, heat-preservation annealing, machining and the like, wherein the working surface is a cylindrical surface, and the wall thickness corresponding to the working surface is 15 mm.

Hardness and zinc pot tests were performed on the products of example 1, example 2 and example 3, and the results are shown in table 1:

TABLE 1 hardness of the product and Zinc Pot test results

The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, the technical solutions and the advantages, it should be understood that the above-mentioned embodiments are not intended to limit the invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. The utility model provides a high temperature resistant corruption, long-life carbide axle sleeve, its characterized in that, carbide axle sleeve component's mass fraction be: less than 2% of C, 10-35% of Cr, less than 5% of Si, 0-16% of W, 1-4% of Fe, 1-30% of Mo, 1-4% of Ni, less than 2% of Mn and the balance of Co.

2. The high temperature corrosion resistant, long life cemented carbide sleeve as claimed in claim 1, wherein the mass fraction of the components of said cemented carbide sleeve is: less than 2% of C, 10-35% of Cr, less than 5% of Si, 0-16% of W, 1-4% of Fe, 1-30% of Mo, 1-4% of Ni, less than 2% of Mn and the balance of Co, wherein the sum of the mass fractions of Ni and Fe is less than 5%.

3. A high temperature corrosion resistant, long life cemented carbide sleeve as claimed in claim 1, wherein said working surface of said sleeve is cylindrical.

4. A high temperature corrosion resistant, long life cemented carbide sleeve as claimed in claim 1, wherein said sleeve running surface corresponds to a wall thickness greater than 7.5 mm.

5. The high temperature corrosion resistant long life cemented carbide sleeve as claimed in claim 1, wherein said sleeve is made by electric furnace melting, casting and heat treatment annealing, machining and other processes.