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High-hardness nodular cast iron roller sheet and casting method thereof

A technology of nodular cast iron and high hardness, which is applied in the field of mechanical casting, can solve the problems of high manufacturing cost, the hardness and service strength of the toothed roller sheet cannot meet the use requirements, and the difficulty of processing, so as to improve the service performance and service life, Effects of improving hardness and uniform distribution of crystal structure

Active Publication Date: 2020-03-24
河北津西钢铁集团重工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that the hardness and service strength of the existing toothed roller sheet cannot meet the requirements of use, the processing difficulty is high, and the manufacturing cost is high, the present invention provides a high-hardness nodular cast iron roller sheet and its casting method

Method used

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  • High-hardness nodular cast iron roller sheet and casting method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] A high-hardness ductile iron material, including the following chemical composition in mass percentage:

[0044] C 2.9%, Si 1.35%, Mn 0.55%, P0.04%, S0.01%, Cr 0.35%, Mo 0.25%, Ni0.3%, Ba 0.02%, Mg 0.04%, RE 0.01%, the balance is Fe and unavoidable impurities.

[0045] The casting method of the straightener roll sheet with the chemical composition of the above-mentioned high-hardness ductile iron material is:

[0046] a. Add steel scrap, pig iron, carburizer and ferrochrome with a mass ratio of 60:25:1:0.5 into an intermediate frequency electric furnace for smelting to obtain alloy molten iron;

[0047] b. After continuing to heat the alloy molten iron until the temperature reaches 1350°C, add 0.5% ferromolybdenum, 0.3% metallic nickel and 0.5% ferromanganese respectively to obtain the basic pouring solution;

[0048] c. Put 1.1% rare-earth magnesium-silicon alloy in the quality of the basic pouring liquid in the groove at the bottom of the dam bag for casting, cover ...

Embodiment 2

[0054] A high-hardness ductile iron material, including the following chemical composition in mass percentage:

[0055] C 3.2%, Si 1.5%, Mn0.7%, P0.05%, S0.01%, Cr 0.5%, Mo 0.5%, Ni 0.5%, Ba 0.01%, Mg 0.06%, RE 0.02%, the balance is Fe and unavoidable impurities.

[0056] The casting method of the straightener roll sheet with the chemical composition of the above-mentioned high-hardness ductile iron material is:

[0057] a. Add steel scrap, pig iron, recarburizer and ferrochrome with a mass ratio of 65:30:2:1 into an intermediate frequency electric furnace for smelting to obtain alloyed molten iron;

[0058] b. After continuing to heat the alloy molten iron until the temperature reaches 1380°C, add 1% ferromolybdenum, 0.5% metallic nickel and 0.6% ferromanganese respectively to obtain the basic pouring solution;

[0059] c. Put 1.1% rare earth magnesium-silicon alloy in the quality of the basic pouring liquid in the groove at the bottom of the dam bag for casting, cover the ...

Embodiment 3

[0063] A high-hardness ductile iron material, including the following chemical composition in mass percentage:

[0064] C3.4%, Si 1.7%, Mn 0.85%, P0.05%, S0.02%, Cr 0.85%, Mo 0.25%, Ni0.7%, Ba0.02%, Mg 0.07%, RE0.03%, The balance is Fe and unavoidable impurities.

[0065] The casting method of the straightener roll sheet comprising the above-mentioned high-hardness ductile iron material is:

[0066] a. Add steel scrap, pig iron, recarburizer and ferrochrome with a mass ratio of 70:35:3:1.2 into an intermediate frequency electric furnace for smelting to obtain alloy molten iron;

[0067] b. After continuing to heat the alloy molten iron until the temperature reaches 1390°C, add 0.5% ferromolybdenum, 0.7% metallic nickel and 0.8% ferromanganese respectively to obtain the base pouring solution;

[0068] c. Put 1.2% rare-earth magnesium-silicon alloy in the quality of the basic pouring liquid in the groove at the bottom of the dam bag for casting, cover the surface of the rare-e...

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Abstract

The invention relates to the technical field of mechanical casting, and particularly discloses a high-hardness nodular cast iron roller sheet and a casting method thereof. The high-hardness nodular cast iron material is prepared from the following chemical components in percentage by mass: 2.9-3.4% of C, 1.35-1.7% of Si, 0.55-0.85% of Mn, less than or equal to 0.06% of P, less than or equal to 0.02% of S, 0.35-0.85% of Cr, 0.25-0.8% of Mo, 0.3-0.7% of Ni, less than or equal to 0.02% of Ba, 0.04-0.07% of Mg, 0.01-0.03% of RE, and the balance of Fe and inevitable impurities. The high-hardness nodular cast iron roller sheet is high in working layer hardness and high in internal toughness, the using performance of the roller sheet is significantly improved, and the service life of the roller sheet is significantly prolonged.

Description

technical field [0001] The invention relates to the technical field of mechanical casting, in particular to a high-hardness ductile iron roll sheet and a casting method thereof. Background technique [0002] In recent years, with the successive production of steel sheet pile production lines in iron and steel enterprises, the market demand for toothed straightening machine rolls as the main accessories is also growing rapidly. At present, the straightening rolls are mainly centrifugally cast, and the shape is mainly a simple cylinder. shape or ring shape, while the straightening machine rolls used in steel sheet piles are mostly tooth-shaped. When the centrifuge is produced, only simple cylindrical or ring shapes can be cast. The tooth shape is mainly obtained by lathe turning. Due to the hardness requirements of the working layer of the roll sheet Generally high, the roll sheet obtained by turning on the machine tool is difficult to process, the processing volume is also la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C37/08C22C33/10B22D15/00B21D3/02
CPCB21D3/02B22D15/005C22C33/10C22C37/04C22C37/08C22C37/10
Inventor 王立勇贾会军郑海明王盼合李迎春赵海员赵东升张国芳冯志春韩承志孙建平马海茹王雅玲路广闫海军李恩宝王永刚杜宏程
Owner 河北津西钢铁集团重工科技有限公司
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