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Method for producing alloy iron roll

A production method and alloy cast iron technology, applied in the field of metallurgical cast iron rolls, can solve problems such as large fluctuations in composition, production space and capital occupation, and many oxidation inclusions, so as to eliminate the hazards of severe rust and oxidation, solve genetic problems, and improve metallurgical quality effect

Inactive Publication Date: 2009-08-12
成都三强轧辊股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chips generated during processing accumulate day and night, and the amount is very large, resulting in the occupation of limited production space and funds
Due to the large surface area of ​​chips, they are easy to be rusted and polluted by oil. If the chips are directly recycled, the oxidation and burning loss in the furnace will be large, the oxidation inclusions will be large, and the fluidity of molten iron will be poor, resulting in large fluctuations in composition and a large tendency of molten iron to be white. poor product quality

Method used

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  • Method for producing alloy iron roll
  • Method for producing alloy iron roll

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The alloy cast iron roll production method adopts the following production steps:

[0021] (1) Raw material preparation: select clean, no inclusions, no oily cast iron roll chips 70wt%-100wt%, scrap steel 0-30wt%; the oily chips should be roasted at a high temperature of 800°C-1000°C; Scrap steel is clean and less rusty, thickness ≥ 5mm, and does not contain harmful components of Sb and Sn; analyze the chemical composition of the chips and scrap steel, according to the composition requirements, burning loss, recovery rate, and purity of the additives of the alloy cast iron roll to be poured To determine the amount of added recarburizer and or alloy; the alloy includes ferrosilicon and or ferrochrome and or ferromolybdenum and or ferromanganese and or ferrosilicon and or nickel; the recarburizer is waste graphite electrode block , Electrode powder or commercially available recarburizer, moisture <0.5% or baked at 100°C-200°C for 6-8 hours.

[0022] (2) Furnace charging ...

Embodiment 2

[0028] The alloy cast iron roll production method adopts the following production steps:

[0029] (1) Raw material preparation: with embodiment 1, most of chip briquetting process, to reduce oxidation phenomenon;

[0030] (2) Furnace with excess water: slag the remaining water in the intermediate frequency induction furnace, add carburant to the melt; spread a layer of briquette chips and loose chips with a thickness of 200-300mm on the carburant Cuttings, to ensure that the cuttings are tightly loaded into the furnace; scrap steel and or cuttings are added to the briquetting cuttings; the cuttings and or scrap steel are pressed with a pressing iron;

[0031] (3) Turn on the furnace and heat up. As the chips in the furnace gradually melt, put the remaining briquetting chips into the furnace in turn. The chips cannot be added to the furnace beyond the furnace mouth; the top of the chips is pressed with a weight;

[0032] (4) After all the raw materials are melted into molten i...

Embodiment 3

[0036] Specifications are , The material is the production method of the alloy ductile graphite infinite chilled cast iron roll of medium NiCrMo, the casting blank weight is 550kg, the net weight is 343kg, and the molten iron weight is 650kg. It adopts the following production steps:

[0037] (1) Raw material preparation: get high NiCrMo roll chips 1, account for 30wt% of batching weight, low and medium NiCrMo roll bar chips 2, account for 40wt% of batching weight, scrap steel 30wt%; Block treatment; scrap steel is clean and less rusty, thickness ≥ 5mm, and does not contain harmful components of Sb and Sn; analyze the chemical composition of chips and scrap steel, and calculate the carburizer and or alloy that needs to be added according to the design composition requirements of the alloy cast iron roll that needs to be poured , the amount of recarburizer and or alloy added is determined according to its purity, burning loss, and recovery rate, see Table 1 for details.

[00...

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Abstract

The invention relates to a method for producing an alloy cast iron roll, which completely adopts 70 to 100 percent of roll chippings, adds a small quantity of scrap steel, adopts novel technical measures of melting, smelting and casting, controls the chemical compositions and the purity of molten iron, solves the transmissible problems of oxidation, inclusion and the like of the chippings, obtains high-quality metallurgical molten iron, produces and casts the infinitely chilled metallurgical spheroidal graphite cast iron roll, and makes the metallurgical structure and the mechanical property of the cast iron roll meet the use requirements.

Description

technical field [0001] The invention relates to a metallurgical cast iron roll, in particular to a method for producing an alloy cast iron roll, in particular to a method for producing an alloy cast iron roll with cast iron chips as most of the raw materials. Background technique [0002] Metallurgical cast iron rolls are a special material, mainly alloy chilled cast iron, alloy nodular infinite chilled cast iron and alloy nodular cast iron. The chilled cast iron roll is a kind of wear-resistant cast iron obtained by using the supercooling degree of the molten iron itself and the quenching method of the mold surface. In the production process of the cast iron roll, the molten iron required for cold casting is generally adopted by medium frequency induction. Melting and smelting in an electric furnace, the main raw material is new iron, plus old materials (some scrap steel and scrap rollers). The mixture of new and old iron materials will melt molten iron with good chilling ...

Claims

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Application Information

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IPC IPC(8): C22C33/08
Inventor 杨德明王永忠汪熹
Owner 成都三强轧辊股份有限公司
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