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Manufacturing method of working layer of icdp roll

A manufacturing method and working layer technology, which is applied in the field of metallurgical machinery roll casting, can solve the problems of increased raw material procurement costs, etc., and achieve the effects of high microhardness of the matrix, refined grains, and refined structure

Active Publication Date: 2016-11-23
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Purchasing cleaner furnace materials as raw materials will cause a substantial increase in raw material procurement costs. Measures such as high-temperature smelting, heat preservation and standing are not ideal for improving the purity of molten iron

Method used

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  • Manufacturing method of working layer of icdp roll

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The manufacturing method of ICDP roll working layer, comprises the following steps:

[0024] ①Pre-melting treatment: Pig iron, iron filings, and returned furnace materials are prepared according to the composition ratio of the ICDP roll working layer, steelmaking pig iron 20%, iron filings + recycled materials 65%, and put into a 30t medium frequency induction furnace for melting; furnace materials are melted to molten iron After 1445°C, it is put into the treatment ladle, and the desiliconization agent (Anyang Huatai Metallurgical Furnace Charge Co., Ltd.), which accounts for 3% of the pre-melted molten iron, is added to the ladle in advance. The desiliconization agent has dual effects of desiliconization and dephosphorization. After the molten iron comes out of the ladle, the silicon and phosphorus elements in the molten iron will initially react with the desiliconization and dephosphorization; the spray gun is deep into the molten iron, and 0.25MPa nitrogen is sprayed...

Embodiment 2

[0029] The manufacturing method of ICDP roll working layer, comprises the following steps:

[0030] ① Pre-melting treatment: the pig iron, iron filings, and returned charge are prepared according to the composition ratio of the ICDP roll working layer, steelmaking pig iron 20%, iron filings + returned charge 65%, and put into the furnace for melting; the charge is melted to 1450°C of molten iron After being released into the processing ladle, a desiliconizing agent (Anyang Huatai Metallurgical Furnace Charge Co., Ltd.) accounting for 3% of the pre-melted molten iron is added to the ladle in advance. The desiliconizing agent has dual effects of desiliconization and dephosphorization. After the molten iron comes out of the ladle, the silicon and phosphorus elements in the molten iron will initially react with the desiliconization and dephosphorization; the spray gun is deep into the molten iron, and 0.25MPa nitrogen is sprayed into the passivated magnesium particles, and the pass...

Embodiment 3

[0035] The manufacturing method of ICDP roll working layer, comprises the following steps:

[0036]① Pre-melting treatment: Prepare pig iron, iron filings, and returned charge according to the composition ratio of the ICDP roll working layer, steelmaking pig iron 20%, iron filings + returned charge 65%, and put them into the furnace for melting; the charge is melted to molten iron at 1450°C After being released into the processing ladle, a desiliconizing agent (Anyang Huatai Metallurgical Furnace Charge Co., Ltd.) accounting for 3% of the pre-melted molten iron is added to the ladle in advance. The desiliconizing agent has dual effects of desiliconization and dephosphorization. After the molten iron comes out of the ladle, the silicon and phosphorus elements in the molten iron will initially react with the desiliconization and dephosphorization; the spray gun is deep into the molten iron, and 0.25MPa nitrogen is sprayed into the passivated magnesium particles, and the passivate...

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Abstract

The invention discloses a manufacturing method of an ICDP roller working layer. The manufacturing method is applied to the roller casting process and includes the steps of pre-melting treatment, high-temperature melting, ingot casting and roller working layer casting. The manufacturing method is characterized in that common furnace charge with furnace charge heredity is converted into high-purity clean furnace charge without furnace charge heredity, a roller can be effectively prevented from cracking, and the service life of a roller product is prolonged. Through furnace charge pre-melting treatment, the contents of harmful elements, impurities and gas in the furnace charge are reduced to a low level (S is smaller than or equal to 0.01%, Si is smaller than or equal to 0.5%, P is smaller than or equal to 0.03%, and [O] is smaller than or equal to 50 ppm), the mechanical performance of castings can be obviously improved, and the effects of refining crystals and improving tissue are achieved. The tissue performance of the ICDP roller working layer produced by the clean furnace charge obtained after pre-melting treatment can be obviously improved, the tissue is refined, the dendritic crystal length is shortened to be smaller than or equal to 500 micrometers, the carbide content is high and larger than or equal to 36%, the base body microhardness is large and larger than or equal to 536 Hm, and abrasion resistance is enhanced.

Description

technical field [0001] The invention relates to the field of metallurgical machinery roll casting, in particular to a method for manufacturing a roll working layer ICDP roll. Background technique [0002] The manufacturing process of ICDP rolls is as follows: First, the working layer of the roll is cast by centrifugal casting method, and then the core of the roll is poured with a core filling funnel. In the production of ICDP roll working layer, steel raw materials such as steelmaking pig iron, processed iron filings, and returned materials (charges for scrap metal such as scrap rolls and chute iron sent back to the furnace for remelting) are often used as furnace materials. These raw materials have charge heredity due to their different sources. If these hereditary properties are not eliminated during the smelting process, they will have an adverse effect on the roll casting structure, affect product quality, and cracks will lead to waste products in severe cases. In tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16B22D13/00B22D1/00
Inventor 李宝石周亮陈立峰栾伟
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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