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Preparation method of rough rolling high-speed steel working roll for full endless rolling of sheet billets

A technology of endless rolling and high-speed steel, which is applied in the field of materials, can solve problems such as the inability to meet the needs of rolling lines and serious cracks in the lower machine, achieve excellent thermal crack resistance and cold and heat fatigue performance, prolong the machine cycle, Effect of increasing stability against tempering

Pending Publication Date: 2021-10-26
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional high-speed steel material has serious cracks in the lower machine, which cannot meet the needs of the rolling line at all.

Method used

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  • Preparation method of rough rolling high-speed steel working roll for full endless rolling of sheet billets
  • Preparation method of rough rolling high-speed steel working roll for full endless rolling of sheet billets

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preparation example Construction

[0026] A method for preparing rough rolling high-speed steel work rolls for full endless rolling of thin slabs, comprising the following steps:

[0027] Step A, using steel scrap, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, ferrotungsten, and electrode powder as raw materials, ferronickel can be replaced by nickel plate, ferrotungsten can be replaced by tungsten wire or tungsten alloy, ferromolybdenum can be replaced by alloy molybdenum , the above-mentioned materials can also be compounds of multi-element alloys, as long as the composition ratio meets the requirements of the alloy range. The outer layer molten iron and the core molten iron are smelted by a power frequency furnace; the chemical composition of the outer layer molten iron is: C: 0.6-1.8%, Si: 0.5-1.5%, Mn: 0.2-1.2%, P≤0.10%, S≤0.1 %, Cr: 4.0-10.0%, Ni: 0.5-3.0%, Mo: 2.0-7.0%, V: 0.5-4.0, W: 0.5-2.0, Nb≤1.0%, the balance is Fe; the core chemical composition range C: 2.3~4.0%, Si: 1.0~4.0%, Mn: 0....

Embodiment 1

[0034] Using scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, ferrotungsten, 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 C: 0.6%, Si: 0.85%, Mn: 0.9%, P: 0.05%, S: 0.06%, Cr: 8.9%, Ni: 2.1%, Mo: 0.85%, V: 1.01%, W: 0.5%, the balance is Fe; core molten iron C: 3.01% , Si: 1.5%, Mn: 0.8%, P: 0.08%, S: 0.09%, Cr: 0.05%, Ni: 0.1%, Mo: 0.1%, W+V+Nb=0.06%, and the balance is Fe. The outer layer is smelted at a temperature of 1550°C. After the composition reaches the standard, it is heated to 1650°C and released from the furnace, blown with argon for 5 minutes, standing for 3 minutes, and cooled to 1553°C for centrifugal casting; the melting temperature of the core molten steel is 1406°C, heated to 1553°C and blown with argon for 6 minutes. Stand still for 3 minutes, the temperature drops to 1456 ℃ and start pouring, 150 hours after ...

Embodiment 2

[0036] Using scrap steel, ferronickel, ferrovanadium, ferrochrome, ferromolybdenum, ferrotungsten, 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 C: 0.8%, Si: 0.85%, Mn: 0.91%, P: 0.05%, S: 0.06%, Cr: 8.8%, Ni: 2.1%, Mo: 2.88%, V: 1.03%, W: 0.6%, the balance is Fe; core molten iron C: 2.95% , Si: 1.45%, Mn: 0.75%, P: 0.06%, S: 0.08%, Cr: 0.03%, Ni: 0.25%, Mo: 0.05%, W+V+Nb=0.03%, 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 1650°C and then released from the furnace. Argon is blown for 4 minutes, left for 2 minutes, and the temperature is lowered to 1558°C for centrifugal casting. The melting temperature of the core molten steel is 1409°C. Stand still for 3 minutes, the temperature drops to 1453 ° C to start pouring, 180 hours after the pouring is co...

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Abstract

The invention discloses a preparation method of a rough rolling high-speed steel working roll for full endless rolling of sheet billets. The preparation method comprises the following steps that A, scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum, ferrotungsten and electrode powder are taken as raw materials, a line frequency furnace is adopted for smelting outer-layer molten iron and core molten iron; B, the product manufacturing mode is centrifugal composite manufacturing, and after smelting components reach the standard, outer-layer molten iron and core molten iron are heated, discharged out of a furnace and poured; C, after pouring is completed, a box is opened in a cold mode, and rough machining is conducted after the box is opened in the cold mode; D, after machining is completed, a roll body is subjected to quenching heating and overall tempering treatment; and E, after quenching heating is finished, finish machining is conducted, and detection is conducted till a finished product is obtained. According to the method, the requirements of short-process endless rolling technologies such as ESP are met, and the roll quality is improved.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing rough-rolled high-speed steel work rolls for full endless rolling of thin slabs. Background technique [0002] The short-process thin slab endless continuous casting and rolling ESP process technology is called the third technological revolution in the iron and steel industry, representing the highest level of hot-rolled strip steel in the world today. The ESP rolling line is very different from the conventional hot strip rolling mill in terms of rolling, especially the liquid core rolling (rolling temperature can reach above 1300°C, which is higher than the rolling temperature of conventional hot continuous rolling), and the rolling speed is slow. The temperature of the roll surface is high; the endless continuous rolling is adopted, the contact time between the roll and the steel plate is long, and the roll rolling cycle is long. There are more special...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16B22D13/00C21D9/38C21D1/18C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/60C22C37/10C22C37/08C22C37/06C22C33/06C22C33/08
CPCB22D19/16B22D13/00C21D9/38C21D1/18C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/60C22C37/10C22C37/08C22C37/06C22C33/06C22C33/08C21D2211/009C21D2211/008Y02P10/20
Inventor 刘娣胡兵杜旭景梁雨来
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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