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A production process of work rolls for rod, wire and hot-rolled strip mills

A production process and work roll technology, which is applied to the special production process field of high-alloy centrifugal composite rolls, can solve the problem of high alloy content in the core, and achieve the effects of reducing carbide content, avoiding roll breakage, and improving wear resistance.

Active Publication Date: 2016-09-21
邢台鸿科高速钢轧辊有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a production process for working rolls for rods, wires and hot-rolled strip steel mills, so as to solve the problem of high alloy content in the core and the amount of carbides in the high-alloy working layer rolls that are currently produced by centrifugal compounding oversized issues, improving its strength and toughness

Method used

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  • A production process of work rolls for rod, wire and hot-rolled strip mills
  • A production process of work rolls for rod, wire and hot-rolled strip mills
  • A production process of work rolls for rod, wire and hot-rolled strip mills

Examples

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Effect test

Embodiment 1

[0018] Example 1: Taking the production of rolls for a certain domestic bar mill with a diameter of φ370×600×1710 as an example, the process of producing high-alloy centrifugal composite rods and wires and work rolls for strip mills will be described in detail.

[0019] The high-alloy material used for the working layer is high-speed steel, and the core material is low-alloy nodular cast iron. These materials can meet the performance requirements for the production of centrifugal composite high-alloy rolls. The composition is as shown in Table 1 below (both are weight percentages, and the balance is iron):

[0020]

[0021] Table 1

[0022] The specific process steps of the centrifugal composite high-speed steel roll are as follows: a. Use high-speed steel materials to smelt the molten iron in the working layer through an intermediate frequency furnace; b. Use ordinary low-alloy nodular cast iron materials to smelt the core molten iron in an intermediate-frequency furnace; ...

Embodiment 2

[0023] Example 2: Taking the production of φ340×600×1465 rolls for a domestic high-speed rolling mill as an example, the process of producing high-alloy centrifugal composite rods and work rolls for strip mills will be described in detail.

[0024] The high-alloy material used in the working layer of this roll is also made of high-speed steel. Due to the different working conditions of the rolling mill, the composition is slightly different from the previous one. The core material is made of low-alloy nodular cast iron. The rolls produced by these materials can also meet user requirements. The composition is shown in Table 2 below (both are weight percentages, and the balance is iron):

[0025]

[0026] Table 2

[0027] The specific process steps of the centrifugal composite high-alloy roll are as follows: a. Use high-speed steel materials to smelt the molten iron in the working layer through an intermediate frequency furnace; b. Use ordinary low-alloy nodular cast iron mat...

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Abstract

The invention discloses a rod and wire and a manufacturing technology of a working roll used for a hot strip mill. The technology comprises the steps as follows: a high alloy material is smelt through an intermediate frequency furnace to obtain working-layer liquid iron; then a special method which combines centrifugal compounding with washing of low alloy ductile cast iron liquid iron is used for casting to form a centrifugal compound roll blank; afterwards, the blank roll is processed by procedures as follows: rough machining until the heat treatment condition is met, high-temperature heating, austenitizing, quenching, tempering, semi-finish-turning machining, finish turning machining and the like, and the blank roll is ground to be a finished product; and finally, a hole pattern is subjected to notching treatment according to requirements of the rolling mill. According to the invention, the roll is produced by adopting the high alloy working-layer material and a unique centrifugal and top pouring type half-washing casting technology, the problems that the metallographic structure is poor and the performance index cannot meet requirements due to high alloy content of a core part of the minor-diameter centrifugal composite roll produced with a conventional method are solved, severe accidents such as roll breakage and the like, which are prone to occur during using of steel rolling are eliminated, and the service life of the roll is prolonged.

Description

technical field [0001] The invention relates to a method for producing work rolls for rods, wires and narrow-strip mills, in particular to a special production process for high-alloy centrifugal composite rolls. Background technique [0002] With the rapid development of my country's steel rolling industry, higher requirements are put forward for the use of rolls, which are one of the main spare parts for rolling mills. In order to improve the service life of rolls and reduce the cost of rolling steel, it is imminent to improve the material of rolls, especially for rod and wire rolling mills. and narrow strip mills, it is urgent to promote high-alloy working layer rolls, and because the rolls used in bar and wire mills and strip mills are generally small in size, it is easy to form in the core when the conventional centrifugal composite method is used to produce high-alloy working layer rolls. A large number of alloys will cause excessive carbides in the core and low strength,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 秦英方秦公辙
Owner 邢台鸿科高速钢轧辊有限公司
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