High-chromium alloy iron roll and preparation method thereof

A technology of high chromium alloy and cast iron rolls, which is applied in the field of rolls, can solve the problems of reducing the service life of rolls, affecting the service life of rolls, and prone to cracks on the roll body, so as to improve hardness and wear resistance, prolong service life and improve work conditional effect

Active Publication Date: 2016-08-03
HUBEI GOLD STANDARD GENERAL ROLLER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-chromium alloy cast iron rolls of the prior art also have the following deficiencies: first, the thermal crack resistance is poor, and the roll body is prone to cracks and peeling off, which affects the service life of the roll; Tempering tr...

Method used

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  • High-chromium alloy iron roll and preparation method thereof
  • High-chromium alloy iron roll and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step one, smelting

[0042] The high chromium alloy cast iron working layer is proportioned as follows: C: 2.6%, Si: 0.5%, Mn: 0.3%, Cr: 20%, Mo: 0.2%, Ni: 0.6%, Cu: 0.2%, B: 0.001 %, V: 0.1%, RE: 0.01%, S: <0.05%, P: <0.05%, and the balance is Fe.

[0043] Add pig iron, scrap rolls, scrap steel, white iron chips, ferromanganese, ferrochrome, nickel plate, ferromolybdenum, ferroboron, copper and ferrovanadium to the medium frequency induction furnace according to the mass percentage of elements in the working layer of high chromium alloy cast iron. The temperature is 1530°C, and RE is added for refining and tempering, and after the composition is adjusted to pass, the molten iron of the high chromium alloy cast iron working layer is obtained.

[0044] The smelting of nodular cast iron roller cores is to melt the molten iron of nodular cast iron roller cores in an intermediate frequency induction furnace at a melting temperature of 1440°C, and add nodulizers and inocula...

Embodiment 2

[0053] Step one, smelting

[0054] The high chromium alloy cast iron working layer is proportioned as follows: C: 2.7%, Si: 0.7%, Mn: 0.5%, Cr: 21%, Mo: 0.25%, Ni: 0.8%, Cu: 0.3%, B: 0.002 %, V: 0.3%, RE: 0.02%, S: <0.05%, P: <0.05%, and the balance is Fe.

[0055] Add pig iron, scrap rollers, scrap steel, white iron chips, ferromanganese, ferrochrome, nickel plate, ferromolybdenum, ferroboron, copper and ferrovanadium to the medium frequency induction furnace according to the mass percentage of elements in the high chromium alloy cast iron working layer, and smelt The temperature is 1550°C, and RE is added for refining and tempering, and after the composition is adjusted to pass, molten iron in the working layer of high chromium alloy cast iron is obtained.

[0056] The smelting of nodular cast iron roller cores is to melt the molten iron of nodular cast iron roller cores in an intermediate frequency induction furnace at a melting temperature of 1450°C, and add nodulizers an...

Embodiment 3

[0065] Step one, smelting

[0066] The high chromium alloy cast iron working layer is proportioned as follows: C: 2.74%, Si: 0.73%, Mn: 0.56%, Cr: 21.5%, Mo: 0.26%, Ni: 1.14%, Cu: 0.3%, B: 0.002 %, V: 0.37%, RE: 0.024%, S: <0.05%, P: <0.05%, and the balance is Fe.

[0067] Add pig iron, scrap rollers, scrap steel, white iron chips, ferromanganese, ferrochrome, nickel plate, ferromolybdenum, ferroboron, copper and ferrovanadium to the medium frequency induction furnace according to the mass percentage of elements in the high chromium alloy cast iron working layer, and smelt The temperature is 1570°C, and RE is added for refining and tempering, and the high-chromium alloy cast iron working layer molten iron is obtained after the composition is adjusted to pass.

[0068] The smelting of nodular cast iron roller cores is to melt the molten iron of nodular cast iron roller cores in an intermediate frequency induction furnace at a melting temperature of 1480°C, and add nodulizers a...

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Abstract

The invention provides a high-chromium alloy iron roll and a preparation method thereof. The roll is composed of a high-chromium alloy cast iron work layer and a nodular cast iron roll core. The work layer comprises the elements of, by mass percentage, 2.6-2.8% of C, 0.5-0.9% of Si, 0.3-0.8% of Mn, 20-22% of Cr, 0.6-1.5% of Ni, 0.2-0.3% of Mo, 0.2-0.4% of Cu, 0.001-0.003% of B, 0.1-0.6% of V, 0.01-0.03% of RE, less than 0.05% of P, less than 0.05% of S and the balance iron. The work layer and the roll core are compounded in a centrifugal machine casting mode, and the high-chromium alloy iron roll is prepared through sub-critical heat treatment. The high-chromium alloy iron roll has good abrasion resistance, tenacity and heat crack resistance, the service life of the roll is prolonged, the heat treatment temperature is low, and energy saving and environment protection are achieved.

Description

technical field [0001] The invention relates to a roll, in particular to a high-chromium alloy cast iron roll and a preparation method thereof, belonging to the technical field of roll manufacturing. Background technique [0002] Roll is the main consumable spare part in steel rolling production. Its quality directly affects the surface quality of rolled material and the production cost of rolled material. Improving roll quality and reducing roll cost have always been the focus of roll manufacturers. At present, the commonly used roll materials are high-nickel-chromium infinitely chilled cast iron, semi-steel, high-chromium white cast iron and high-carbon high-speed steel. High-nickel-chromium infinitely chilled cast iron rolls are brittle, and semi-steel rolls have low hardness and poor wear resistance. Although high-carbon high-speed steel has high hardness and good wear resistance, it needs to add more iron alloys such as tungsten, molybdenum, vanadium, and niobium. Caus...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/08C22C37/04C22C33/08C21C1/10B22D19/16B22D13/02C21D5/00
CPCB22D13/02B22D19/16C21C1/105C21D5/00C22C33/08C22C37/04C22C37/08C22C37/10Y02P10/20
Inventor 闫玉荣方勤波肖万宏苏海根牛飞
Owner HUBEI GOLD STANDARD GENERAL ROLLER
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