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Intermediate roll of multi-roll rolling 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 the effect of good accident resistance and high wear resistance

Active Publication Date: 2017-05-17
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 and accident resistance are poor. It cannot meet Sendzimir, which has high requirements for accident resistance and wear resistance. Rolling Mill Intermediate Roll Requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0016] The chemical composition and weight percentage of the intermediate rolls 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 the rest for iron and inevitable impurities.

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

[0018] ①Smelting and forging roll blanks according to chemical composition and weight percentage.

[0019] ②Preliminary heat treatment: quenching and tempering treatment at a temperature of 970°C first, then air-cooled for 1-2 minutes, then oil-cooled, then transferred to a 300°C isothermal heating furnace, and finally tempered at a temperature of 615°C.

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

Embodiment 2～ Embodiment 5）

[0023] Each embodiment is basically the same as embodiment 1, and the difference is 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% Intermediate roll diameter 100mm 100mm 100mm 100mm 100mm Matrix hardness 90HSD 89HSD 90HSD 89HSD 88HSD stress 80MPa -100MPa 110MPa 80MPa -90MPa Paralympic weight 1.5% 2.1% 2.5% 1.9% 2.7% Unit mm rolling capacity 3122 3028 2980 3020 3056 Wear rate (mm 3 / N m)

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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 a multi-roll mill intermediate roll and a manufacturing method thereof, in particular to a multi-roll mill intermediate roll that can meet the requirements of a Sendzimir mill and a manufacturing method thereof. Background technique [0002] With the continuous increase of domestic Sendzimir mills, S6 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 a manufacturing method thereof. 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 are Fe and unavoidable impurities. The manufacturing method of the cold roll includes making a cold roll bill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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