A low-cost and high-wear-resistant stretching and reducing roll and its heat treatment process

A process and annealing treatment technology, which is applied in the field of low-cost and high-wear-resistant seamless steel pipe tensioning and reducing roll material and its heat treatment process, which can solve the problems of easy roll breakage, high roll consumption, and prone to ring rolling marks on the roll surface. , to achieve the effect of prolonging service life, improving production efficiency, and improving oxidation resistance and thermal crack resistance.

Active Publication Date: 2021-08-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The purpose of the present invention is to develop a new type of high-chromium cast iron stretching and reducing roll to overcome the problems of high roll consumption of the current stretching and reducing roll, easy breakage of the roll when the hole is large, and ring-shaped rolling marks on the roll surface during rolling.

Method used

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  • A low-cost and high-wear-resistant stretching and reducing roll and its heat treatment process
  • A low-cost and high-wear-resistant stretching and reducing roll and its heat treatment process
  • A low-cost and high-wear-resistant stretching and reducing roll and its heat treatment process

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Embodiment 1-5

[0074] According to the scope of the chemical composition designed by the present invention, the induction furnace is used for smelting, and inoculation and modification are carried out during the smelting process; during the cooling process after casting, the annealing process is carried out with the furnace keeping warm for 3 hours at 920°C; with a heating rate of 200°C / h Heating, at 600°C, carry out 8min uniform temperature preservation; continue to heat up at a heating rate of 200°C / h, at 800°C, carry out 8min uniform temperature preservation; quench at 1010°C, hold for 30min, and cool to 850 ℃, keep warm for 25 minutes, then blow nitrogen to cool, control the cooling rate to 5 ℃ / s, cool down to below 300 ℃, take out the furnace and air cool to room temperature, and temper in time (within 2-3h). Tempering: Heating at a heating rate of 200°C / h, tempering at 550°C for 120 minutes; cooling to 200°C with the furnace, and air cooling to room temperature. The tempering process o...

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Abstract

The invention provides a low-cost, high-wear-resistant stretch-reducing roll and its heat treatment process. The normal-temperature hardness of the low-cost, high-wear-resistant stretch-reducing roll obtained by the invention is >50HRC, and the tensile strength is >700MPa. It overcomes the problems of high roll consumption of the stretching and reducing roll, easy breakage of the roll when the diameter is large, and ring-shaped rolling marks on the roll surface during the rolling process.

Description

technical field [0001] The invention relates to a diameter-reducing roller, in particular to a material of a diameter-reducing roller of a low-cost and high-wear-resistant seamless steel pipe and a heat treatment process thereof. Background technique [0002] Baosteel's seamless steel pipe products include oil well pipes, boiler pipes, general commodity pipes, and transportation pipes, etc., and the production specifications cover Φ21-457mm. A number of varieties were successfully developed first in China and continued to maintain a leading position. After years of continuous technological innovation, the variety of steel pipes has developed from a single carbon steel pipe to alloy steel, stainless steel and special alloy steel pipes. The demand for seamless steel pipe products also reflects the trend of more, more personalized, and faster and faster demand updates. . With the rapid catch-up of other domestic manufacturers, and the relatively old equipment of Baosteel 140 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/02C22C38/04C21D6/00C21D9/38
CPCC21D6/002C21D6/005C21D6/008C21D9/38C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 瞿海霞顾廷权吴君朱翔宇
Owner BAOSHAN IRON & STEEL CO LTD
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