A kind of hot-rolled narrow strip steel for fan blade and its preparation method

A fan blade and narrow strip steel technology, which is applied in the field of special steel, can solve the problems of poor dimensional accuracy of hot-rolled products, failure to meet the use requirements of fan blades, and large fluctuations in product thickness, so as to reduce reduction and improve strip wear in finishing rolling Stability and flatness control ability, effect of reducing rolling load in finish rolling

Active Publication Date: 2020-05-01
QIANAN CITY JIUJIANG WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low quality requirements of raw materials in the pipe industry, the steel mills have relatively rough control over the production process of hot-rolled strip steel, and the dimensional accuracy of the hot-rolled products produced is poor, with AB difference ≤ 0.12mm and three-point difference ≤ 0.12mm , pass difference ≤0.18mm), resulting in large fluctuations in the thickness of the product after cold rolling, which cannot meet the requirements of the fan blade manufacturer

Method used

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preparation example Construction

[0021] The invention provides a method for preparing hot-rolled narrow strip steel for fan blades, comprising the following steps:

[0022] The raw material is smelted to obtain a smelted billet, and the raw material contains the following elements in weight percentage: C: ≤0.08%, Si: ≤0.15%, Mn: 0.25-0.45%, P: ≤0.030%, S: ≤0.035 %, Cr: ≤0.20%, Ni: ≤0.20%, Cu: ≤0.20%, the balance of iron;

[0023] Heating the smelted billet in a soaking section to obtain a heated material, the heating temperature in the soaking section is 1260-1280°C, and the heating time in the soaking section is 130-145 minutes;

[0024] Rough rolling the heated material five times to obtain an intermediate billet;

[0025] The intermediate slab is subjected to 8-9 passes of finish rolling to obtain a finish-rolled slab, the roll diameters of the first and second pass work rolls are independently 480-520 mm, and the roll diameters of the third and fourth pass work rolls are independently 320~325mm, the fif...

Embodiment 1

[0039] The mass percentage of chemical composition is: C: 0.07%, Si: 0.12%, Mn: 0.35%, P: 0.015%, S: 0.018%, Cr: 0.02%, Ni: 0.01%, Cu: 0.01%, and the rest are iron and Unavoidable impurities, and continuous casting into a rectangular billet with a section of 150*280mm.

[0040] The heating temperature in the soaking section is 1272°C, the heating time is 135min, the rough rolling entrance temperature is 1232°C, the exit thickness of the first rough rolling pass is 120.5mm, the exit thickness of the second pass is 91.2mm, the exit thickness of the third pass is 60.0mm, the exit thickness of the fourth pass The exit thickness of the pass is 40.7mm, the exit thickness of the fifth pass is 26.3mm, and the rough rolling and final rolling temperature is 1172°C. The roll diameter of the first and second passes of finishing rolling is 480 mm, the roll diameter of the third and fourth passes is 320 mm, the roll diameter of the fifth pass is 315 mm, and the roll diameter of the sixth pa...

Embodiment 2

[0043] The mass percentage of chemical composition is: C: 0.05%, Si: 0.15%, Mn: 0.45%, P: 0.020%, S: 0.021%, Cr: 0.07%, Ni: 0.10%, Cu: 0.10%, and the rest are iron and Unavoidable debris, and continuous casting into a rectangular billet with a section of 165*330mm.

[0044] The heating temperature in the soaking section is 1280°C, and the heating time is 145min. The exit thickness of the third pass is 61.6mm, the exit thickness of the fourth pass is 40.2mm, the exit thickness of the fifth pass is 26.5mm, and the rough rolling and final rolling temperature is 1185°C. The roll diameter of the first and second passes of finishing rolling is 520 mm, the roll diameter of the third and fourth passes is 325 mm, the roll diameter of the fifth pass is 320 mm, and the roll diameter of the sixth pass is 315 mm. .mm, the diameter of the work rolls in the seventh pass of finish rolling is 305.5mm, the diameter of the work rolls in the eighth pass of finish rolling is 301.3mm, the diameter...

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Abstract

The invention provides hot-rolled narrow strip steel for fan blades, and belongs to the field of special steel. According to the hot-rolled narrow strip steel and the preparation method, the heating temperature of a uniform heating section is controlled in a narrow range, the heating time of the uniform heating section is prolonged, the temperature uniformity of a casting blank is improved, the temperature difference in and outside the blank body is reduced, and the phenomena of bending and twisting of rolled pieces in the rolling process are avoided; the bouncing value of a rolling mill is reduced, the stability of the rolling process is improved, the finish rolling roller diameter difference is strictly controlled and the roller diameter of the finish rolling working roller is standardized, the roller diameter is arranged from large to small, the contact arc length of the small-diameter working roller and the rolled material is short, the rolling force, the friction force and the torque can be greatly reduced, and the rolling precision is improved. The data of the embodiment show that the product prepared by the method is high in dimensional precision, the AB difference is less than or equal to 0.01 mm, the three-point difference is less than or equal to 0.03 mm, the strip difference is less than or equal to 0.04 mm, the production requirements of fan blades can be met, the cost is not increased compared with the conventional production process, meanwhile, the implementation difficulty is low, and the method has extremely high generalization performance.

Description

technical field [0001] The invention relates to the technical field of special steel, in particular to a hot-rolled narrow strip steel for fan blades and a preparation method thereof. Background technique [0002] Fan, as an electrical appliance for cooling and ventilation. Since the 1990s, with the popularization and popularity of air conditioners, the fan industry has been generally regarded as a sunset industry. However, in recent years, with the continuous improvement of people's concept of healthy life, and the country's increasing emphasis on energy conservation and low-carbon economy, the fan market has continued to grow and sales have increased significantly. [0003] As an important part of the fan, the fan blade is widely made of carbon structural steel. At present, the carbon structure hot-rolled narrow strip steel produced by most enterprises is mainly used in the pipe industry. Due to the low quality requirements of raw materials in the pipe industry, the ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/42C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/42
Inventor 马啸晨梁鹏冯润壮
Owner QIANAN CITY JIUJIANG WIRE
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