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Tool steel roller for rolling medium-thickness plate and manufacturing method thereof

A manufacturing method and tool steel technology, which is applied in the manufacture of tools, rolls, metal rolling, etc., can solve the problems of easy thermal cracking, insufficient wear resistance of rolls, and poor surface quality, so as to avoid cracking and increase the millimetric rolling capacity , Improve the effect of wear resistance

Active Publication Date: 2014-01-22
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a medium plate tool steel roll and its production method to solve the technical problems of traditional rolls such as insufficient wear resistance, poor surface quality, and easy thermal cracking during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A tool steel roll for rolling medium and thick plates, including a core of ductile iron, a roll neck and a tool steel outer layer, the alloy composition and weight percentage of the tool steel outer layer The design target is: C1.60~1.80 %, Si0.90~1.00%, Mn0.80~1.00%, Cr14.00~15.00%, Ni0.20~0.50%, Mo1.0~1.3%, V0.30~0.50%, S≤0.03%, P ≤0.05%, the rest is Fe and unavoidable impurities.

[0024] The manufacturing method of described tool steel roll is as follows:

[0025] a) Smelting: The working layer of the roll body is made of high-quality scrap steel and appropriate alloys as raw materials, and is smelted in an induction furnace at a temperature of 1500°C to 1600°C; the molten steel is deoxidized with aluminum before it is released from the furnace, and the amount of aluminum added is 0.5%~1% by weight, the reaction temperature is 1500℃~1560℃;

[0026] The core of the roll is ductile iron, with pig iron as raw material, smelted in a blast furnace at a temperature of 1...

Embodiment 2

[0035] The difference with embodiment 1 is:

[0036]The design target of the alloy composition and weight percentage of the outer layer of tool steel is: C1.70~1.90%, Si0.80~1.00%, Mn0.70~0.90%, Cr11.00~13.00%, Ni1.50~1.80% , Mo0.20~0.50%, V0.40~0.60%, S≤0.03%, P≤0.05%, and the rest are Fe and unavoidable impurities.

[0037] The amount of aluminum added during the smelting process is 0.8% of the weight of molten steel, the amount of inoculant added is 0.5%, and the amount of nodularizing agent added is 1.1%; After the pouring of molten steel in the working layer of the roller body is completed, the centrifuge speed is adjusted to 500 rpm; the annealing temperature of the preliminary heat treatment is 500 ° C, and the holding time is 180 hours; the quenching temperature of the final heat treatment is 900 ° C, the quenching holding time is 5 hours, and the strong blowing is used for cooling Method; tempering temperature 520 ℃, tempering time a total of 180 hours.

[0038] The...

Embodiment 3

[0041] The difference with embodiment 1 is:

[0042] The alloy composition and weight percentage of the outer layer of tool steel are designed as follows: C1.80-2.00%, Si 0.70-0.90%, Mn0.60-0.80%, Cr12.00-14.00%, Ni0.80-1.10%, Mo1.30~1.50%, V0.60~0.80%, S≤0.03%, P≤0.05%, and the rest are Fe and unavoidable impurities.

[0043] The amount of aluminum added in the smelting process is 1% of the weight of molten steel, the amount of inoculant added is 0.4%, and the amount of nodularizing agent added is 1.3%; After the pouring of molten steel in the working layer of the roller body is completed, the centrifuge speed is adjusted to 450 rpm; the annealing temperature of the preliminary heat treatment is 580°C, and the holding time is 200 hours; the quenching temperature of the final heat treatment is 1000°C, and the quenching holding time is 8 hours. Method; tempering temperature 500 ℃, tempering time a total of 170 hours.

[0044] The chemical composition of the molten steel is an...

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Abstract

The invention discloses a tool steel roller for rolling a medium-thickness plate and a manufacturing method thereof. The tool steel roller comprises a core part of nodular cast iron, a roller neck and a roller body work layer, wherein the roller body work layer comprises the following chemical components in percentage by weight: 1.60-2.2% of C, 0.50-1.00% of Si, 0.50-1.00% of Mn, 10.00-15.00% of Cr, 0.20-1.80% of Ni, 0.20-1.50% of Mo, 0.20-1.00% of V, less than or equal to 0.03% of S, less than or equal to 0.05% of P and the balance of Fe and unavoidable impurities. According to the tool steel roller and manufacturing method disclosed by the invention, by designing a reasonable alloy composition and processing technology, the mechanical properties of a working roller of a rolling mill are effectively improved, and the wear resistance and millimeter rolling amount of the roller are increased; moreover, the tool steel roller has good hot-crack resistance, and the working efficiency of a medium-thickness plate rolling mill can be remarkably improved.

Description

technical field [0001] The invention relates to a roll and a manufacturing method, in particular to a roll for rolling a medium-thick plate and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of my country's metallurgical industry, my country's steel output has increased year by year, and the rolling quality of steel has also continued to improve, so the performance requirements for rolls are also getting higher and higher. Due to the extremely harsh service conditions of the roll, it is subject to great alternating stress, bending stress, shear stress and friction during the working process, so it is very easy to produce wear, thermal cracking, uneven surface quality, peeling, indentation, etc. . These problems seriously affect the working efficiency and service life of the rolling mill, and restrict the quality of the plate. The performance of the roll mainly includes the strength, hardness, wear resistance of the...

Claims

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Application Information

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IPC IPC(8): C22C38/56C22C38/46C22C37/10B22D13/00B21B27/02
Inventor 刘娣尹秀芳韩建宁
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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