High-carbon graphitic steel roller ring for profile steel universal mill and manufacturing method of high-carbon graphitic steel roller ring

A universal rolling mill and manufacturing method technology, applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of easy cracking, poor thermal crack resistance, sticking to steel, etc., to reduce the tendency of sticking to steel and less sensitive to thermal effects. , the effect of moderate breaking strength and toughness

Active Publication Date: 2015-11-25
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rolls made of high-carbon semi-steel are generally used in the rough and medium rolling stands of some large and medium-sized rolling mill vertical stands. In addition, some section steel manufacturers use semi-steel rolls to stick to steel, which has a great impact on the normal rolling and production organization of section steel factories. Therefore, it is necessary to develop a high-carbon semi-steel material. A new roll ring for universal section mills to meet the needs of the market

Method used

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  • High-carbon graphitic steel roller ring for profile steel universal mill and manufacturing method of high-carbon graphitic steel roller ring
  • High-carbon graphitic steel roller ring for profile steel universal mill and manufacturing method of high-carbon graphitic steel roller ring
  • High-carbon graphitic steel roller ring for profile steel universal mill and manufacturing method of high-carbon graphitic steel roller ring

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A high-carbon graphite steel roll ring for a steel universal rolling mill, comprising an outer layer of high-carbon graphite steel and a core of low-carbon low-alloy graphite steel, the chemical composition and mass percentage of the outer layer are: C : 2.13%, Si: 1.75%, Mn: 1.00%, P≤0.03%; S≤0.02%, Cr: 1.22%, Ni: 1.00%, Mo: 0.50%, the rest is Fe and unavoidable impurities;

[0055] The chemical components and mass percentages of the core are: C: 1.30%, Si: 1.20%, Mn: 0.70%, P: 0.03%; S: 0.01%, Cr: 0.35%, and the rest are Fe and unavoidable impurities.

[0056] First of all, modeling, the roll body model in the casting mold adopts a metal mold sprayed with paint inside, the roll neck model in the casting mold adopts quartz sand clay modeling, and then uses the following manufacturing method to manufacture high-carbon graphite steel roll rings for steel universal rolling mills :

[0057] A. Intermediate frequency furnace smelting. Raw materials with low P, S and impur...

Embodiment 2

[0067] The preparation process is basically the same as that of Example 1, the difference being that in the step A, the melting temperatures of the outer layer raw material and the core raw material are both 1590°C.

Embodiment 3

[0069] The preparation process is basically the same as that of Example 1, the difference being that in the step B, the addition amounts of Si-Ca grains, FeSiMgRE alloys, 1# alloys and Si-Fe grains are 0.4%, 1.5%, 1.1%, 0.5%, respectively. %; the number of inoculation treatments is 4 times; the particle size of Si-Ca particles and Si-Fe particles are both 12mm; the sedation time of molten steel for inner and outer layers of ladle and molten steel for core material is both 8 minutes.

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Abstract

The invention discloses a high-carbon graphitic steel roller ring for a profile steel universal mill and a manufacturing method of the high-carbon graphitic steel roller ring. The outer layer of the roller ring is composed of, by mass, 1.70%-2.30% of C, 1.50%-2.20% of Si, 0.50%-1.20% of Mn, 0.03% of P or less, 0.03% of S or less, 1.00%-1.80% of Cr, 0.20%-1.20% of Ni, 0.20%-0.80% of Mo and the balance Fe. A core is composed of, by mass, 1.00%-2.00% of C, 1.00%-2.00% of Si, 0.50%-1.50% of Mn, 0.03% of P or less, 0.03% of S or less, 0.5% of Cr or less and the balance Fe. The manufacturing method comprises the steps of smelting, inoculation and spheroidizing, centrifugal casting and heat treatment. Spheroidizing is carried out at least two times. The metallographic structure of the roller ring obtained after heat treatment comprises a pearlite base body, carbide with the area rate of 10.36% and graphite, the form of the graphite is in a mass shape or a mass insect shape, and the area rate of the graphite is 1.7%. The high-carbon graphitic steel roller ring has high wear resistance, breaking resisting strength, toughness, hot crack resistance and accident impact resisting capacity, and the steel bonding tendency is avoided.

Description

technical field [0001] The invention relates to a roll and a manufacturing method thereof, in particular to a high-carbon graphite steel roll ring for a profile steel universal rolling mill and a manufacturing method thereof. Background technique [0002] my country's wire rod production has made great progress. In 2014, the total output of wire rod reached more than 10,000Mt. The roll ring is the key spare part on the wire rod rolling mill. The universal rolling mill is the main wire rod rolling mill. The universal rolling mill is mainly used to roll various types of steel, such as: H-beam, rail, I-beam, channel steel, steel sheet pile, U-beam, L Various types of section steel such as section steel and unequal angle steel are named universal rolling mill because they are suitable for rolling various kinds of steel. In addition to the wear of the wire rod, the roll ring used in the universal rolling mill is also subjected to the heating of the high-temperature wire rod and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/56C22C38/44C22C38/36C22C38/34C22C38/18C22C38/04B22D13/04B22D19/16C21C7/00C21D9/40B21B27/02
Inventor 刘娣彭书平白思诺王宝宏韩建宁朱志磊冀鑫刚
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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