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Preparation method of high-speed steel working roll for finish rolling of hot rolled strip

A technology of high-speed steel and work rolls, applied in the field of materials, can solve the problems of limiting the production capacity of hot-rolled lines and the use of finishing-rolled high-speed steel, and achieve the effects of prolonging the machine cycle, increasing the carbide content, and good accident resistance

Pending Publication Date: 2022-04-19
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increase of production capacity in the steel industry, the demand for the application of high-speed steel in the whole line is becoming more and more urgent. At present, there are high-speed steel work rolls in the front section of vertical roll, rough rolling and finish rolling to meet the market demand, while the mainstream material of the post-finish rolling section is still high-speed steel. Nickel-chromium work rolls and conventional high-speed steels are greatly restricted in the use of conventional high-speed steels due to stripping in the post-finishing section, especially in the finished frame.
Therefore, the high-speed steel in the post-finishing section and the finished stand has become a short board that limits the increase in production capacity of the hot-rolling line

Method used

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  • Preparation method of high-speed steel working roll for finish rolling of hot rolled strip
  • Preparation method of high-speed steel working roll for finish rolling of hot rolled strip

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preparation example Construction

[0024] A method for preparing hot-rolled strip finishing high-speed steel work rolls, comprising the steps of:

[0025] Step A, smelting molten iron to meet the corresponding composition requirements, the melting temperature of the outer layer of molten steel is 1400-1700°C, and the melting temperature of the core molten steel at 1300-1600°C meets the design composition requirements before it can be released from the furnace for pouring;

[0026] Step B. After the smelting composition reaches the standard, the outer layer and the core molten iron are heated to a temperature of 1500-1800°C and released from the furnace, and poured when the temperature drops to 1200-1500°C. When pouring, the outer layer adopts the method of adding inoculant with the flow, and the core molten iron adopts the method of adding nodulizer inoculant at the bottom of the bag. The top of the nodulizer is covered with a 10-20mm thick steel plate, and steel scrap is used around the steel plate. Crumb cove...

Embodiment 1

[0038] Using scrap steel shavings, forged steel heads, ferromolybdenum, ferrovanadium, and electrode powder as raw materials, it is smelted in an intermediate frequency furnace to reach the design composition range of high-speed steel: outer layer molten iron C1.98%, Si1.56%, Mn0.9%, P0.06%, S0.07%, Cr3.56%, Ni2.51%, Mo0.85%, V2.39%, W0.96%, the balance is Fe; core molten iron C2.93%, Si1.32 %, Mn0.75%, P0.06%, S0.08%, Cr0.03%, Ni0.23%, Mo0.25%, W+V+Nb=0.05%, and the balance is Fe. The outer layer is smelted at a temperature of 1590°C. After the composition is up to standard, the temperature is raised to 1630°C and then released for centrifugal casting. The outer layer is made of an overturned iron ladle, and the outer layer is added with the inoculant during pouring. The melting temperature of the core molten steel is 1450°C, and the bottom drain is used. Type molten iron ladle, pouring by adding nodulizer inoculant to the bottom of the ladle. The top of the nodulizer is cove...

Embodiment 2

[0040] Using scrap steel shavings, forged steel heads, ferromolybdenum, ferrovanadium, and electrode powder as raw materials, it is smelted in an intermediate frequency furnace to reach the design composition range of high-speed steel: outer layer molten iron C1.98%, Si1.56%, Mn0.9%, P0.06%, S0.07%, Cr3.59%, Ni2.58%, Mo0.89%, V2.45%, W0.91%, the balance is Fe; core molten iron C2.93%, Si1.32 %, Mn0.75%, P0.06%, S0.08%, Cr0.03%, Ni0.23%, Mo0.25%, W+V+Nb=0.05%, and the balance is Fe. The outer layer is smelted at a temperature of 1550°C. After the composition reaches the standard, the temperature is raised to 1750°C and then it is centrifugally poured out of the furnace. The outer layer is turned over ladle, and the inoculant is added to the bottom of the ladle when pouring. The melting temperature of the core molten steel is 1350°C. Nodulizer inoculant is added to the bottom of the bag, and the steel moisture in the core is poured twice. The first pouring temperature is 1395°C,...

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Abstract

The invention discloses a preparation method of a hot-rolled plate strip finish rolling high-speed steel working roll, which belongs to the technical field of roll materials, and comprises the component range, the manufacturing mode and the preparation process parameters of the working roll. The high-speed steel working roll for finish rolling of a hot-rolled strip, especially for a finished rack, with high surface quality, high accident resistance and high wear resistance is prepared, and the high-speed steel working roll is more suitable for a rolling line rolling roll meeting the requirement for prolonging the service life of the finish rolling roll, especially the finished rack roll.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a high-speed steel work roll for hot-rolled strip finish rolling. Background technique [0002] With the increase of production capacity in the steel industry, the demand for the application of high-speed steel in the whole line is becoming more and more urgent. At present, there are high-speed steel work rolls in the front section of vertical roll, rough rolling and finishing rolling to meet the market demand, while the mainstream material in the post-finishing section is still high-speed steel. Nickel-chromium work rolls and conventional high-speed steel are greatly restricted in the use of conventional high-speed steel due to the stripping in the post-finishing section, especially in the finished frame. Therefore, the high-speed steel in the post-finishing section and the finished stand has become a short board that limits the increase in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16C22C38/02C22C38/04C22C38/56C22C38/44C22C38/46C22C38/48C22C38/60C22C37/10C22C37/06C22C37/08C22C33/04B22D1/00C22C33/08C22C33/10C21D9/38C21D1/25
CPCB22D19/16C22C38/02C22C38/04C22C38/56C22C38/44C22C38/46C22C38/48C22C38/60C22C37/10C22C37/06C22C37/08C22C33/04B22D1/00C22C33/08C22C33/10C21D9/38C21D1/25Y02P10/20
Inventor 刘娣胡兵马凤川
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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