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A kind of preparation method of ductile iron vertical roll for tropical vertical rolling mill

A vertical roll mill and ductile iron technology, which is applied in the field of roll materials, can solve the problems of poor thermal crack resistance, anti-adhesion resistance, poor wear resistance, poor thermal conductivity and lubricating performance, and short service life, and achieve wear resistance and cold and heat. Good fatigue performance, good high temperature thermal shock and thermal crack resistance, high wear resistance effect

Active Publication Date: 2022-08-05
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] The current hot-tropical vertical roll frame uses alloy steel, semi-steel, and forged steel vertical rolls. In actual use, the heat conduction and lubrication performance is poor, and it is suitable for the good high-temperature thermal shock and thermal cracking resistance required by the vertical rolls to contact high-temperature billets. , anti-adhesion and relatively good wear resistance are poor, the service life is short, and the production cost is high

Method used

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  • A kind of preparation method of ductile iron vertical roll for tropical vertical rolling mill
  • A kind of preparation method of ductile iron vertical roll for tropical vertical rolling mill
  • A kind of preparation method of ductile iron vertical roll for tropical vertical rolling mill

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preparation example Construction

[0020] A preparation method of a ductile iron vertical roll for a tropical vertical rolling mill, comprising the following steps:

[0021] A. Using scrap steel, ferronickel, ferrovanadium, ferromolybdenum, and electrode powder as raw materials, the main component of the electrode powder is a graphitized recarburizer, and molten iron is smelted by an electric arc furnace. The melting temperature is 1400-1600 ° C. After melting Out of the furnace to get the molten iron ladle.

[0022] B. Add 0.8-1.5% rare earth magnesium nodularizing agent by weight of molten iron into the molten iron ladle obtained in step A, and the weight percentages of each component in molten iron are respectively: C: 3.0-3.8%, Si: 1.0-3.0%, Mn : 0.4-1.2%, P≤0.10%, S≤0.08%, Cr: 0.2-1.0%, Ni: 1.5-3.5%, Mo: 0.2-1.0%, the balance is Fe, cast to obtain the balls for the hot belt vertical roller mill Iron vertical roll blanks.

[0023] C. Treat the ductile iron vertical roll blank for a tropical vertical roll ...

Embodiment 1

[0025] Using scrap steel, ferronickel, ferrovanadium, ferromolybdenum, and electrode powder as raw materials, it is smelted in an electric arc furnace at a temperature of 1400 ℃. The sub-contents are: C: 3.0%, Si: 1.0%, Mn: 0.4%, P: 0.05%, S: 0.05%, Cr: 0.20%, Ni: 1.5%, Mo: 0.20%, and the balance is Fe. After pouring the ductile iron vertical roll blank for the tropical vertical roll mill, 120 hours later, the box was cold-opened. Body spray cooling, roll neck air cooling; furnace tempering at 400 ℃ for 30h.

Embodiment 2

[0027] Using scrap steel, ferronickel, ferrovanadium, ferromolybdenum, and electrode powder as raw materials, it is smelted in an electric arc furnace at a temperature of 1430 ° C. After melting, it is heated to 1540 ° C and then released to obtain a molten iron ladle, adding 1.2% of rare earth magnesium nodularizing agent, molten iron The weight percentages of each component are: C: 3.1%, Si: 2.2%, Mn: 0.5%, P: 0.06%, S: 0.06%, Cr: 0.3%, Ni: 1.8%, Mo: 0.3%, The balance is Fe. After pouring the ductile iron vertical roll blank for the tropical vertical roll mill, it was cold-opened for 130 hours, and the ductile iron vertical roll blank for the tropical vertical roll mill was heat-treated by means of integral heating. Spray cooling, roll neck air cooling; furnace tempering at 420°C for 38h.

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Abstract

The invention relates to a method for preparing a ductile iron vertical roll for a tropical vertical rolling mill, belonging to the technical field of roll materials, comprising the following steps: A. Using scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, using an electric arc furnace Smelting molten iron, the smelting temperature is 1400-1600 ℃, and the molten iron ladle is obtained after melting and clearing; B, adding a nodularizing agent to the molten iron ladle obtained in step A, pouring to obtain a ductile iron vertical roll blank for a tropical vertical roll mill, cooling for 120-160h Unpacking; C. The ductile iron vertical roll blank for a tropical vertical roll mill prepared in step B is treated by an integral heating and heat treatment method. The ductile iron vertical roll for the tropical vertical rolling mill prepared by the invention has good wear resistance and cold and thermal fatigue performance, good thermal conductivity and lubricating performance, good toughness, and is suitable for the good heat resistance required by the tropical vertical roll to contact the high-temperature steel billet. High temperature thermal shock and thermal crack resistance, blocking resistance and relatively good wear resistance, meet the requirements of hot-rolled strip edge rolling.

Description

technical field [0001] The invention relates to a preparation method of a ductile iron vertical roll for a tropical vertical roll mill, and belongs to the technical field of roll materials. Background technique [0002] The current tropical vertical roll frame uses alloy steel, semi-steel, and forged steel vertical rolls. In the actual use process, the thermal conductivity and lubricating properties are poor, which is suitable for the good high temperature thermal shock and thermal crack resistance required by the vertical roll contacting the high temperature steel billet. , The anti-adhesion and relatively good wear resistance are poor, the service life is short, and the production cost is high. [0003] The ductile iron vertical roll prepared by the invention has a certain amount of graphite distributed in the matrix, has good thermal conductivity and lubricating properties, good toughness, and the material used is in a reasonable distribution ratio of each component, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/10C22C37/10C22C37/08C22C37/04
CPCC22C33/10C22C37/10C22C37/08C22C37/04
Inventor 尹秀芳胡兵
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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