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Preparation method of ductile iron vertical roll for hot strip vertical roll mill

A technology of vertical rolling mill and ductile iron, which is applied in the field of roll materials, and can solve the problems of high production cost, short service life, thermal cracking resistance, adhesion resistance and poor wear resistance

Active Publication Date: 2021-05-18
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Preparation method of ductile iron vertical roll for hot strip vertical roll mill
  • Preparation method of ductile iron vertical roll for hot strip vertical roll mill
  • Preparation method of ductile iron vertical roll for hot strip vertical roll mill

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preparation example Construction

[0020] A preparation method for a nodular iron vertical roll for a hot-tropical vertical roll mill, comprising the steps of:

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

[0022] B. Add 0.8-1.5% rare earth magnesium nodulizer by weight of molten iron into the molten iron ladle obtained in step A, and the weight percentages of each component of 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 get the ball for hot vertical roller mill Iron vertical roller blanks.

[0023] C. Treat the nodular iron vertical roll blank for a tropical vertical roll mill prepared in step B by means of overall h...

Embodiment 1

[0025] Using steel scrap, ferronickel, ferrovanadium, ferromolybdenum, and electrode powder as raw materials, it is smelted in an electric arc furnace at a temperature of 1400°C. After melting, it is released from the furnace to obtain a ladle, and 1.0% of rare earth magnesium nodulizer is added. The component 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 nodular iron vertical roll blanks for tropical vertical roll mills, open the box for 120 hours, and heat-treat the nodular iron vertical roll blanks for tropical vertical roll mills by means of overall heating. Body spray cooling, roll neck air cooling; 400 ℃ loading furnace tempering 30h.

Embodiment 2

[0027] Using scrap steel, ferronickel, ferrovanadium, ferromolybdenum, and electrode powder as raw materials, it is melted 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 ladle. Add 1.2% rare earth magnesium nodulizer, 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 casting the nodular iron vertical roll blanks for tropical vertical roll mills, open the box for 130 hours, and heat treat the nodular iron vertical roll blanks for tropical vertical roll mills by means of overall heating. After preheating at 450°C for 24 hours, heat at 870°C for 320 minutes, Spray cooling, roll neck air cooling; 420 ℃ loading furnace tempering 38h.

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Abstract

The invention relates to a preparation method of a ductile iron vertical roll for a hot strip vertical roll mill and belongs to the technical field of roll materials. The method comprises the following steps: A, taking scrap steel, ferronickel, ferrovanadium, ferromolybdenum and electrode powder as raw materials, smelting molten iron by adopting an electric arc furnace at the smelting temperature of 1400-1600 DEG C, and discharging after melting down to obtain a ladle; B, adding a spheroidizing agent into the ladle obtained in the step A to obtain a ductile iron vertical roll blank for the hot strip vertical roll mill through pouring, and conducting cold box opening for 120-160 h; and C, treating the ductile iron vertical roll blank for the hot strip vertical roll mill prepared in the step B in an overall heating heat treatment mode. The ductile iron vertical roll for the hot strip vertical roll mill prepared by the invention has good wear resistance and cold and hot fatigue performance, good heat conduction and lubrication performance, good toughness, good high-temperature thermal shock, hot crack resistance, blocking resistance and relatively good wear resistance required by the hot strip vertical roll in contact with a high-temperature steel billet, and the ductile iron vertical roll is suitable for the hot strip vertical roll in contact with the high-temperature steel billet, so that the requirement on edge rolling of hot-rolled strip steel is met.

Description

technical field [0001] The invention relates to a method for preparing a nodular iron vertical roll for a hot-tropical vertical roll mill, and belongs to the technical field of roll materials. Background technique [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. [0003] The ductile iron vertical roller prepared by the present invention distributes a certain amount of graphite in the matrix, has good thermal conductivity and lubricating performance, good toughness, and the proportion of each component of the material used is reasonable, and the ductile iron ...

Claims

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Application Information

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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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