Intermediate roll of multi-roll mill and manufacturing method thereof

A manufacturing method and technology of intermediate rolls, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as poor wear resistance and accident resistance, failure to meet the requirements of accident resistance and wear resistance, etc. Achieve good anti-accident performance and high wear resistance

Active Publication Date: 2015-05-27
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The intermediate roll is a large-diameter intermediate roll used in six-high rolling mills. Its matrix hardness is generally lower than 80HSD, and its wear resistance a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

[0015] (Example 1)

[0016] The chemical composition and weight percentage of the middle roll of the multi-roll mill in this embodiment are as follows: carbon 0.85%, silicon 0.80%, manganese 0.50%, chromium 7.50%, molybdenum 2.00%, vanadium 0.50%, phosphorus 0.015%, sulfur 0.005%, and others It is iron and inevitable impurities.

[0017] The manufacturing method of the intermediate roll of the multi-roll mill in this embodiment is as follows:

[0018] ①Smelt and forge roll blanks according to chemical composition and weight percentage.

[0019] ②Preliminary heat treatment: firstly carry out quenching and tempering treatment at 970℃, then air cooling for 1~2min and then oil cooling, then transfer to 300℃ isothermal heating furnace, and finally carry out tempering treatment at 615℃.

[0020] ③Final heat treatment: first heat to 1050°C in a protective atmosphere heating furnace for overall quenching treatment, then cold treatment at -75°C, and finally tempering treatment at 530°C. The tem...

Example

[0022] (Example 2 to Example 5)

[0023] Each embodiment is basically the same as embodiment 1, and the differences are shown in Table 1.

[0024] Table 1

[0025] Example 1 Example 2 Example 3 Example 4 Example 5 carbon 0.85% 0.90% 0.80% 0.85% 0.85% silicon 0.80% 0.85% 0.75% 0.80% 0.80% manganese 0.50% 0.45% 0.55% 0.50% 0.50% chromium 7.50% 7.50% 7.50% 7.20% 7.80% molybdenum 2.00% 2.00% 2.00% 2.10% 1.90% vanadium 0.50% 0.45% 0.55% 0.50% 0.50% phosphorus 0.015% 0.015% 0.015% 0.015% 0.015% sulfur 0.005% 0.005% 0.005% 0.005% 0.005% Middle roll diameter 100mm 100mm 100mm 100mm 100mm Matrix hardness 90HSD 89HSD 90HSD 89HSD 88HSD stress 80MPa -100MPa 110MPa 80MPa -90MPa Paralympic 1.5% 2.1% 2.5% 1.9% 2.7% Rolling volume in mm31223028298030203056 Wear rate (mm 3 / N·m) 7.28×10 -7 7.33×10 -7 7.31×10 -7 7.29×10 -7 7.31×10 -7

Example

[0026] (Comparative Example 1)

[0027] The chemical composition and weight percentage of the middle roller of this comparative example are as follows: carbon 0.85%, silicon 0.80%, manganese 0.50%, chromium 5.00%, molybdenum 1.00%, vanadium 0.50%, phosphorus 0.015%, sulfur 0.005%, and the rest are iron and Inevitable impurities.

[0028] The manufacturing method of the intermediate roll of this comparative example is as follows:

[0029] ①Smelt and forge roll blanks according to chemical composition and weight percentage.

[0030] ②Preliminary heat treatment: quenching and tempering temperature is 930℃, direct oil cooling, tempering temperature is 550℃.

[0031] ③Final heat treatment: the overall quenching temperature is 970℃, and the tempering temperature is 500℃.

[0032] The relevant performance parameters of the intermediate roller of this comparative example are shown in Table 2.

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PUM

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Abstract

The invention discloses an intermediate roll of a multi-roll mill and a manufacturing method thereof. The intermediate roll of the multi-roll mill comprises the following chemical components in percentage by weight: 0.80-0.90 percent of carbon, 0.60-1.00 percent of silicon, 0.40-0.60 percent of manganese, 7.00-8.00 percent of chromium, 1.80-2.20 percent of molybdenum, 0.40-0.70 percent of vanadium, less than or equal to 0.025 percent of phosphorus, less than or equal to 0.010 percent of sulfur and the balance of iron and inevitable impurities. The manufacturing method of the intermediate roll of the multi-roll mill comprises the steps of smelting and forging of a roll blank, pre-heat treatment and final heat treatment, wherein the pre-heat treatment adopts tempering and quenching treatment at the temperature of 960-980 DEG C and tempering treatment at the temperature of 600-630 DEG C; the final heat treatment adopts overall quenching treatment at the temperature of 1,020-1,070 DEG C, cold treatment at the temperature of minus 75 DEG C and tempering treatment at the temperature of 500-550 DEG C. The intermediate roll of the multi-roll mill has better wear resistance performance and better accident resistance performance, and the requirements of a Sendzimir mill can be met.

Description

technical field [0001] The invention relates to an intermediate roll of a multi-roll rolling mill and a manufacturing method thereof, in particular to an intermediate roll of a multi-roll rolling mill capable of meeting the requirements of a Sendzimir rolling mill and a manufacturing method thereof. Background technique [0002] With the continuous increase of domestic Sendzimir rolling mills, S6 rolling mills and other types of multi-roll mills, the demand for small-diameter multi-roll mill intermediate rolls represented by Sendzimir intermediate rolls is also increasing. [0003] Chinese patent document CN101956145A discloses a semi-high-speed steel cold-rolled intermediate roll and its manufacturing method. The chemical composition and weight percentage of the cold-rolled intermediate roll are: C0.50-0.90%; Si0.5-2.00%; Mn0.20~1.00%; Cr4.50~6.00%; Mo0.50~2.00%; V0.20~1.00%; Ni≤0.80%; S≤0.025%; P≤0.025%; the rest is Fe and unavoidable Impurities. The manufacturing method...

Claims

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Application Information

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IPC IPC(8): B21B27/00C22C38/24C21D9/38C21D1/18
Inventor 许强胡现龙孙菲菲陈伟张青丁辉
Owner BAOSTEEL ROLL SCI & TECH
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