CN110125370B

CN110125370B - Manufacturing method of heat-resistant composite roller for ultrathin cast-rolling strip steel rolling mill

Info

Publication number: CN110125370B
Application number: CN201910444413.1A
Authority: CN
Inventors: 艾忠诚; 杜立朝; 回桢玉; 李艳红
Original assignee: Angang Heavy Machinery Co Ltd
Current assignee: Anshan Iron Roll Co.,Ltd.
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2021-02-19
Anticipated expiration: 2039-05-27
Also published as: CN110125370A

Abstract

The invention relates to a manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip steel rolling mill, wherein the heat-resistant composite roller is formed by compounding a roller core material and an outer layer material; the material of the roller core is nodular cast iron, and the material of the outer layer is heat-resistant high-speed steel; smelting an outer layer material, then blowing argon for purification treatment, smelting a roller core material, then carrying out spheroidization and inoculation treatment, casting outer layer material molten steel by using a centrifugal casting method, and casting roller core material molten iron by using a static casting method after the outer layer material molten steel is solidified; and after the casting is finished, cooling to the box opening temperature, taking out the composite roller, then carrying out heat treatment and mechanical processing, and obtaining a finished product after the inspection is qualified. The composite roll with the roll core made of the nodular cast iron material and the outer layer made of the heat-resistant high-speed steel material is adopted, so that the carbon content of the heat-resistant high-speed steel material is reduced, the alloy content is properly reduced under the condition of ensuring the hardenability, and the roll is ensured to have good wear resistance and good heat resistance, and the use requirements of an ultrathin cast-rolling strip mill are completely met.

Description

Manufacturing method of heat-resistant composite roller for ultrathin cast-rolling strip steel rolling mill

Technical Field

The invention relates to the technical field of roller manufacturing, in particular to a manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip steel rolling mill.

Background

The roller of the ultrathin cast-rolling strip steel production line has the following working condition characteristics: the rolling speed is low, the temperature born by the roller is high, the thermal shock is large, and the roller is required to have good heat resistance while the wear resistance is ensured, so that the service cycle of the roller is long, and the quality of rolled strip steel meets the requirement. Although the high-speed steel roller for the traditional hot-rolled strip mill is wear-resistant, the heat resistance is poor, and the use requirement of the ultrathin cast-rolled strip mill on the roller cannot be met.

Disclosure of Invention

The invention provides a manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip mill, which adopts the composite roller with a roller core made of nodular cast iron material and an outer layer made of heat-resistant high-speed steel material to reduce the carbon content of the heat-resistant high-speed steel material, properly reduces the alloy content under the condition of ensuring hardenability, finally ensures that the roller has good wear resistance and good heat resistance, and completely meets the use requirements of the ultrathin cast-rolling strip mill.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip steel rolling mill is disclosed, wherein the heat-resistant composite roller is formed by compounding a roller core material and an outer layer material; the roller core material is nodular cast iron, and the outer layer material is heat-resistant high-speed steel; wherein:

the nodular cast iron comprises the following chemical components in percentage by weight: 3.0 to 3.5 percent of C, 2.0 to 3.0 percent of Si, less than 0.5 percent of Mn, less than 0.1 percent of P, less than 0.03 percent of S, 0.03 to 0.06 percent of Mg, 0.02 to 0.05 percent of Re and less than 0.2 percent of Mo;

the heat-resistant high-speed steel comprises the following chemical components in percentage by weight: 0.9 to 1.5 percent of C, 0.4 to 1.1 percent of Si, 0.3 to 0.7 percent of Mn, less than 0.03 percent of P, less than 0.03 percent of S, 1.0 to 2.0 percent of Ni, 2 to 5 percent of Cr, 2 to 5 percent of Mo, 2 to 5 percent of V, Re: 0.01 to 0.1 percent;

the manufacturing method of the heat-resistant composite roller comprises the following steps:

1) smelting the outer layer material in an intermediate frequency furnace, wherein the smelting temperature is 1500-1600 ℃, and performing argon blowing purification treatment on the smelted molten steel for more than 5 min;

2) smelting the roll core material in a power frequency furnace, wherein the smelting temperature is 1450-1500 ℃; spheroidizing and inoculating the smelted molten iron, wherein yttrium-based heavy rare earth is used as a spheroidizing agent during spheroidizing, and the addition amount of the yttrium-based heavy rare earth is 1.0-1.6 percent of the weight of the molten iron; 75SiFe is adopted as an inoculant during inoculation treatment, and the addition amount is 0.9-1.5 percent of the weight of molten iron;

3) casting purified outer layer material molten steel by a centrifugal casting method, and casting spheroidized and inoculated roller core material molten iron by a static casting method after the outer layer material molten steel is solidified; the centrifugal gravity multiple is 110-130G during centrifugal casting, the casting temperature of molten steel of an outer layer material is 1420-1480 ℃, and the casting temperature of molten steel of a core roll material is 1350-1400 ℃;

4) and after the casting is finished, cooling to the box opening temperature, taking out the composite roller, then carrying out heat treatment and machining, and obtaining a heat-resistant composite roller finished product after the inspection is qualified.

Compared with the prior art, the invention has the beneficial effects that:

the composite roll with the roll core made of the nodular cast iron material and the outer layer made of the high-speed steel material is adopted, the carbon content of the high-speed steel material is reduced, the alloy content is properly reduced under the condition of ensuring the hardenability, and the roll is ensured to have good wear resistance and good heat resistance, so that the use requirement of the ultrathin cast-rolling strip mill is completely met.

Detailed Description

The invention relates to a manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip steel rolling mill, wherein the heat-resistant composite roller is formed by compounding a roller core material and an outer layer material; the roller core material is nodular cast iron, and the outer layer material is heat-resistant high-speed steel; wherein:

3) casting purified outer layer material molten steel by a centrifugal casting method, and casting spheroidized and inoculated roller core material molten iron by a static casting method after the outer layer material molten steel is solidified; the centrifugal gravity multiple is 110-130G during centrifugal casting, the casting temperature of molten steel of an outer layer material is 1420-1480 ℃, and the casting temperature of molten steel of a roller core material is 1350-1400 ℃;

The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[ examples ] A method for producing a compound

In the present example, the chemical components of the nodular cast iron as the material of the roll core are shown in the following table in percentage by weight:

C

Si

Mn

P

S

Mg

Re

Mo

example 1

3.22％

2.77％

0.12％

0.05％

0.027％

0.038％

0.034％

0.04％

Example 2

3.15％

2.49％

0.37％

0.06％

0.016％

0.052％

0.048％

0.08％

Example 3

3.36％

2.63％

0.44％

0.03％

0.022％

0.049％

0.036％

0.14％

Example 4

3.27％

2.54％

0.08％

0.04％

0.006％

0.052％

0.021％

0.08％

Example 5

3.36％

2.89％

0.29％

0.08％

0.015％

0.034％

0.044％

0.11％

The chemical composition of the heat-resistant high-speed steel as the outer layer material is shown in the following table in weight percent:

C

Si

Mn

P

S

Ni

Cr

Mo

V

Re

example 1

0.96％

0.45％

0.38％

0.021％

0.022％

1.43％

3.89％

4.21％

2.18％

0.013％

Example 2

0.94％

0.77％

0.66％

0.024％

0.017％

1.03％

2.04％

2.05％

3.04％

0.016％

Example 3

1.25％

0.56％

0.61％

0.014％

0.010％

1.08％

2.83％

3.77％

2.17％

0.036％

Example 4

1.10％

1.02％

0.48％

0.018％

0.008％

1.83％

4.62％

2.19％

4.12％

0.054％

Example 5

1.36％

0.82％

0.53％

0.012％

0.006％

1.55％

3.68％

2.62％

3.98％

0.022％

The technological parameters in the manufacturing process of the heat-resistant composite roller are shown in the following table:

compared with the conventional composite roll, the relationship between the wear resistance and the heat resistance of the heat-resistant composite roll is shown in the following table:

	wear resistance	Heat resistance
			Example 1	Is 0.950 times of that of the conventional composite roller	Is 1.67 times of the conventional composite roller
Example 2	Is 0.953 times of that of the conventional composite roller	Is a conventional combined rolling1.62 times of the roller
			Example 3	Is 0.962 times of the conventional composite roller	Is 1.52 times of the conventional composite roller
Example 4	Is 0.957 times of that of the conventional composite roller	Is 1.58 times of the conventional composite roller
			Example 5	Is 0.970 times of the conventional composite roller	Is 1.50 times of the conventional composite roller

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A manufacturing method of a heat-resistant composite roller for an ultrathin cast-rolling strip steel rolling mill is disclosed, wherein the heat-resistant composite roller is formed by compounding a roller core material and an outer layer material; the roller core material is nodular cast iron, and the outer layer material is heat-resistant high-speed steel; the method is characterized in that:

the nodular cast iron comprises the following chemical components in percentage by weight: 3.0 to 3.5 percent of C, 2.0 to 3.0 percent of Si, 0.08 to 0.29 percent of Mn, less than 0.1 percent of P, less than 0.03 percent of S, 0.03 to 0.06 percent of Mg, 0.02 to 0.021 percent of Re, and less than 0.2 percent of Mo;

the heat-resistant high-speed steel comprises the following chemical components in percentage by weight: 0.9 to 1.1 percent of C, 0.4 to 0.77 percent of Si, 0.3 to 0.38 percent of Mn, less than 0.03 percent of P, less than 0.03 percent of S, 1.0 to 2.0 percent of Ni, 2 to 2.83 percent of Cr, 2 to 5 percent of Mo, 2 to 5 percent of V, Re: 0.01 to 0.1 percent;