Hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and preparation method thereof

A technology for hot straightening rolls and thick steel plates, which is applied in the field of metallurgical hot-rolled steel plate equipment and hot-rolled hot straightening rolls for wide and thick steel plates, which can solve problems such as thermal stability and insufficient wear resistance.

Inactive Publication Date: 2011-06-29
CHANGZHOU BAOLING HEAVY IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although H13 has good resistance to cold and heat fatigue, there are still deficiencies in strength

Method used

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  • Hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and preparation method thereof
  • Hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and preparation method thereof
  • Hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A hot-rolled hot straightening roll suitable for steel plates with a thickness of ≤60mm, the material of which is modified H13 hot work die steel, and the weight percentage of each component element is:

[0039] Cr 4.5~6.0%,

[0040] Mo 1.0~2.0%,

[0041] Si 0.6~1.5%,

[0042] Ni 0.8~1.2%,

[0043] V 0.8~2.0%,

[0044] C 0.35~0.6%,

[0045] P≤0.02%,

[0046] S≤0.01%,

[0047] Fe and unavoidable impurity balance.

[0048]The surface hardness of the product roll is in the range of HRC56-63, the surface hardness difference is ≤2HRC, and the effective hardened layer is in the range of 10-15mm. The metallographic structure of the quenched layer on the surface of the finished hot-rolled hot straightening roll is a fine-grained structure of grade 8 or above of tempered martensite and dispersed granular carbides. The yield strength of the finished hot-rolled hot straightening roll is in the range of 920-970Mpa, the tensile strength is in the range of 1100-1200Mpa, the y...

Embodiment 2

[0049] Embodiment 2, as attached figure 2 shown.

[0050] A method for preparing a hot-rolled hot straightening roll as described in Example 1, followed by the steps of preparing blank roll, quenching and tempering treatment, machining, surface quenching treatment, tempering treatment, and finishing step to obtain a hot-rolled hot-rolled straightening roll Straight rolls which:

[0051] The material used for the roll body is the modified H13 hot work die steel;

[0052] The surface quenching treatment adopts the method of vertical 2500-3000HZ intermediate frequency induction rapid heating and pressure water spray rapid cooling, and the quenching temperature is controlled within the range of 1130-1170°C;

[0053] The tempering treatment is performed twice in the tempering furnace, the tempering temperature is controlled within the range of 520°C to 580°C, and the tempering time of each tempering treatment is ≥10h;

[0054] The tempering treatment also includes the straighte...

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Abstract

The invention discloses a hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and a preparation method thereof. The hot straightening roll comprises the following components in percentage by weight: 4.5 to 6.0 percent of Cr, 1.0 to 2.0 percent of Mo, 0.6 to 1.5 percent of Si, 0.8 to 1.2 percent of Ni, 0.8 to 2.0 percent of V, 0.35 to 0.6 percent of C, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, and the balance of Fe and inevitable impurities. The preparation method sequentially comprises the following steps of: preparing a blank roll; conditioning; machining; performing surface quenching treatment; annealing; and performing finish machining, wherein the surface quenching temperature is 1,130 to 1,170 DEG C; the annealing temperature is 520 to 580 DEG C and the annealing time is more than or equal to 10 hours; and during annealing, roll straightening treatment that pressure straightening is performed on high points through heavy objects is carried out. The hot straightening roll product has the characteristics of high matrix strength, high comprehensive performance, high surface hardness and wear resistance, high cold and hot fatigue resistance, and the like; and the preparation method has the characteristics of simplicity, convenience, reliability, low process cost, high quality of product and the like.

Description

technical field [0001] The invention relates to a hot-rolled hot-leveling roll suitable for ≤60mm thick steel plates and a preparation method thereof, in particular to a hot-rolled wide-thick steel plate with a roll body length in the range of 3-6m and an aspect ratio in the range of 10-20 The hot straightening roll belongs to the equipment technology of metallurgical hot rolling steel plate. Background technique [0002] The hot-rolled hot straightening roll involved in the present invention is an important part of a multi-roll straightening machine for hot-rolled steel plates. Due to its special working environment, it needs to work at a temperature of 600-900°C for a long time (the temperature of the roller surface often rises to 500°C). To avoid uneven wear and damage on the roll surface, to reduce the number of frequent roll changes and ensure the working efficiency of the straightening machine, it is required that the straightening roll should have high matrix strengt...

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D9/38C21D1/25
Inventor 郑鹏飞杨庆明周峰
Owner CHANGZHOU BAOLING HEAVY IND MACHINERY
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