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High-hardness hot rough rolling work roll for rolling non-ferrous metal and manufacturing method thereof

A manufacturing method and non-ferrous metal technology, applied in the field of hot rolling rolls, can solve problems such as inability to match, cannot be used normally, thermal burn cracks, etc., and achieve the effect of satisfying hardness uniformity

Active Publication Date: 2021-05-07
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the improvement of plate quality in recent years, some customers have requested that the surface hardness of the roll body must be greater than 80HSD during hot rough rolling, and the tempering temperature of the currently used material is basically below 350°C when reaching this hardness range, and some aluminum plates There is a certain period of dry rolling during rolling, that is, there is no cooling liquid at the initial stage of rolling, so the current products often have thermal burn cracks during use, resulting in failure to use normally, and can no longer match this working condition

Method used

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  • High-hardness hot rough rolling work roll for rolling non-ferrous metal and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1）

[0028] The chemical composition and weight percentage of the high-hardness hot rough rolling work roll for rolling non-ferrous metals in this embodiment are as follows: carbon 0.50%; silicon 1.30%; manganese 0.30%; phosphorus ≤ 0.015%; sulfur ≤ 0.010%; chromium 5.00%; Nickel 0.25%; molybdenum 1.70%; vanadium 0.40%; the rest is iron and unavoidable impurities.

[0029] The manufacturing method of the high-hardness hot rough rolling work roll of the rolling nonferrous metal of the present embodiment is as follows:

[0030] ① Smelt and forge the roll blank according to the chemical composition and weight percentage.

[0031] ② Preparatory heat treatment.

[0032] First preheat the roll billet in the first temperature range of the heating furnace (380°C in this embodiment) for the first time for 20 hours, and then conduct the second preheating in the second temperature range of the heating furnace (620°C in this embodiment) Secondary preheating for 20 hours, followed by temperin...

Embodiment 2～ Embodiment 5）

[0040] The difference between each embodiment and embodiment 1 lies in the chemical composition, see Table 1 for details.

[0041] Table 1

[0042] Example 1 Example 2 Example 3 Example 4 Example 5 carbon 0.50% 0.35% 0.65% 0.50% 0.50% silicon 1.30% 1.30% 1.30% 1.20% 1.40% manganese 0.30% 0.50% 0.10% 0.30% 0.30% phosphorus ≤0.015% ≤0.015% ≤0.015% ≤0.015% ≤0.015% sulfur ≤0.010% ≤0.010% ≤0.010% ≤0.010% ≤0.010% chromium 5.00% 5.00% 5.00% 5.20% 4.80% nickel 0.25% 0.40% 0.10% 0.25% 0.25% molybdenum 1.70% 1.70% 1.70% 1.60% 1.80% vanadium 0.40% 0.20% 0.60% 0.40% 0.40% Roll body surface hardness 83-84HSD 82-83HSD 82-83HSD 80-81HSD 81-82HSD Depth of hardened layer 51~53mm 52~54mm 52~53mm 53~55mm 53~54mm Uniformity of hardness ≤2HSD ≤2HSD ≤2HSD ≤2HSD ≤2HSD

Embodiment 6～ Embodiment 9）

[0044] The difference between each embodiment and embodiment 1 lies in the heat treatment process, see Table 2 for details.

[0045] Table 2

[0046]

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Abstract

The invention discloses a high-hardness hot rough rolling work roll for rolling nonferrous metals and a manufacturing method thereof. The composition of the hot rough work roll is as follows: 0.35-0.65% carbon; 0.80-1.60% silicon; 0.10-0.50% manganese; Phosphorus≤0.015%; Sulfur≤0.010%; Chromium 4.00~6.50%; Nickel 0.10~0.40%; Molybdenum 1.00~2.50%; Vanadium 0.20~0.60%; The tempering treatment in the final heat treatment adopts a two-stage tempering method; among them, the tempering temperature of the first stage is 500-570 ° C, and the time is 15-80 hours; the tempering temperature of the second stage is 10-80 hours lower than the tempering temperature of the first stage 20°C, the time is 15-80h. In the invention, by optimizing the alloy composition and the corresponding heat treatment process, the hot rough rolling work roll with high tempering temperature and high hardness can be finally obtained.

Description

technical field [0001] The invention belongs to the technical field of hot rolling rolls, and in particular relates to a high-hardness hot rough rolling work roll for rolling nonferrous metals and a manufacturing method thereof. Background technique [0002] When rolling non-ferrous metals, such as rough rolling of aluminum plates, because the temperature of aluminum plates is generally about 500°C, considering that there is a certain cooling liquid during rolling, the currently commonly used forged steel Cr3 materials (such as 70Cr3Mo, 70Cr3NiMo, etc.) and Cr5 The material can basically meet the requirements of use, and the surface hardness range of the hot roll body that matches the working conditions is basically limited to 60-75HSD. [0003] With the improvement of plate quality in recent years, some customers have requested that the surface hardness of the roll body must be greater than 80HSD during hot rough rolling, and the tempering temperature of the currently used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C21D6/00C21D9/38B21B27/00
CPCB21B27/00C21D6/004C21D6/005C21D6/008C21D9/38C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 李北玉陈伟谢晶罗昌兰勇王文明
Owner BAOSTEEL ROLL SCI & TECH
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