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Preparation method of surface roughness resistant roller for heavy and medium plate mill

A technology of rough surface, plate rolling mill, applied in the field of roll manufacturing, can solve the problems of low wear resistance, adverse effects on roll neck structure and performance, etc., and achieve the effect of reducing roll wear, good roll surface retention ability, and prolonging service life.

Pending Publication Date: 2022-04-15
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wear resistance of conventional ductile iron materials is slightly lower than that of conventional high-nickel-chromium materials, and the overall addition of high alloys is likely to have an adverse effect on the structure and performance of the roll neck

Method used

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  • Preparation method of surface roughness resistant roller for heavy and medium plate mill
  • Preparation method of surface roughness resistant roller for heavy and medium plate mill
  • Preparation method of surface roughness resistant roller for heavy and medium plate mill

Examples

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preparation example Construction

[0030] A preparation method of an anti-rough surface roll for a plate rolling mill, comprising the following steps:

[0031] Step 1. Use steel scrap, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, and electrode powder as raw materials, and use a power frequency furnace to smelt the molten iron in the outer layer of the roll and the molten iron in the core of the roll. The melting temperature of the molten iron in the outer layer of the roll is 1400-1700 °C, the melting temperature of the molten iron at the core of the roll is 1300-1600 °C until the melting composition meets the design composition requirements;

[0032] Ferronickel can be replaced by nickel plate, and ferromolybdenum can be replaced by alloy molybdenum. The above materials can also be compounds of multi-element alloys, as long as the composition ratio meets the requirements of the alloy range.

[0033] The chemical composition of the outer layer of the roll and the weight percentage of each composi...

Embodiment 1

[0049] A preparation method of an anti-rough surface roll for a plate rolling mill, comprising the following steps:

[0050] Step 1, using steel scrap, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, and electrode powder as raw materials, smelting in an intermediate frequency furnace to reach the design composition range of ductile iron: the chemical composition of molten iron in the outer layer of the roll and the weight percentage of each composition are : C3.33%, Si1.1%, Mn0.9%, P0.05%, S0.06%, Cr0.8%, Ni2.1%, Mo0.85%, W+V+Nb=0.15%, The balance is Fe and unavoidable impurities; the chemical composition of molten iron in the core of the roll and the weight percentage of each composition are: C3.01%, Si1.5%, Mn0.8%, P0.08%, S0.09% , Cr0.05%, Ni0.1%, Mo0.1%, W+V+Nb=0.06%, and the balance is Fe.

[0051] Step 2: The molten iron on the outer layer of the roll is smelted at a temperature of 1610°C. After the composition meets the design requirements, the temperature ...

Embodiment 2

[0056] A preparation method of an anti-rough surface roll for a plate rolling mill, comprising the following steps:

[0057] Step 1: Use steel scrap, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, and electrode powder as raw materials, and smelt them in an intermediate frequency furnace to reach the design composition range of ductile iron:

[0058] The chemical composition of molten iron in the outer layer of the roll and the weight percentage of each composition are: C2.80%, Si1.0%, Mn0.8%, P0.06%, S0.08%, Cr0.9%, Ni2.89% , Mo0.79%, W+V+Nb=0.12%, the balance is Fe; the chemical composition of molten iron in the core of the roll and the weight percentage of each composition are: C2.95%, Si1.45%, Mn0.75% , P0.06%, S0.08%, Cr0.03%, Ni0.25%, Mo0.05%, W+V+Nb=0.03%, the balance is Fe and unavoidable impurities.

[0059] Step 2: The molten iron on the outer layer of the roll is smelted at a temperature of 1611°C. After the composition meets the design requirements, th...

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Abstract

The invention discloses a preparation method of an anti-surface-roughness roller for a heavy and medium plate mill, which belongs to the technical field of roller manufacturing, and comprises the following steps: respectively smelting roller outer layer molten iron and roller core molten iron by adopting scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials and adopting a line frequency furnace; after smelting components meet the designed component requirements, roller outer layer molten iron and roller core molten iron are both electrically heated and then discharged out of a furnace, centrifugal casting is conducted after cooling, and spheroidizing inoculation is conducted during centrifugal casting; after centrifugal pouring is completed, a box is opened in a cold mode, and rough machining is conducted after the box is opened After rough machining is completed, differential temperature heat treatment is conducted; and finish machining is conducted after heat treatment is finished, and detection is conducted till a roller finished product is obtained. Through design adjustment of the roller material and the preparation process, the surface roughness resistant roller for the heavy and medium plate rolling mill with the high wear-resistant outer layer and the high-toughness core part is prepared, the impact resistance, thermal fatigue resistance, high wear resistance and high roller surface retaining capacity of the roller in the rolling industry can be improved, and the roller quality is improved.

Description

technical field [0001] The invention relates to the technical field of roll manufacturing, in particular to a method for preparing a rough-resistant roll for a medium-thick plate rolling mill. Background technique [0002] At present, the working rolls of medium and heavy plate rolling lines all use high nickel and chromium, and some rolling lines have begun to use high chromium steel, high chromium iron and high-speed steel rolls. There is no relevant research on the ductile iron rolls used in medium and heavy plate rolling lines. The ductile iron material has been successfully used as the billet rolling mill roll in the section steel-rail beam rolling line. The EVRAZ REGINA Steckel Mill in Canada abroad and a hot continuous rolling roughing stand in Turkey have always used the ductile iron roll as the rough rolling work roll. Ductile iron rolls have a certain amount of graphite evenly distributed in the matrix, all of which have good thermal conductivity and lubricating pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02B22D19/16B23P15/00C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48B21B27/03
CPCY02P10/20
Inventor 胡兵
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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