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Low-cost and high-wear-resistant stretch reducing roller and heat treatment process thereof

A high-wear, low-cost technology, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of easy roller breakage, ring-shaped rolling marks on the roll surface, and high roll consumption.

Active Publication Date: 2020-05-05
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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  • Low-cost and high-wear-resistant stretch reducing roller and heat treatment process thereof
  • Low-cost and high-wear-resistant stretch reducing roller and heat treatment process thereof
  • Low-cost and high-wear-resistant stretch reducing roller and heat treatment process thereof

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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 and high-wear-resistant stretch reducing roller and a heat treatment process thereof. According to the obtained low-cost and high-wear-resistant stretch reducing roller, the normal-temperature hardness is more than 50 HRC, and the tensile strength is more than 700 MPa; and the problems of high consumption, prone roll breaking in case of large hole diameter and prone annular rolling mark on the roll surface in the rolling process of a current stretch reducing roller are solved.

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 Applications(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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