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Method for fast cooling low-carbon hot-rolling small H-shaped steel

A rapid cooling, H-shaped steel technology, applied in the direction of cooling bed, metal rolling, metal rolling, etc., can solve the problems of restricting the production of small H-shaped steel, uneven structure, low mechanical properties of waist and leg joints, etc., to improve the comprehensive Mechanical properties, improving product yield, improving the effect of cross-section uniformity

Active Publication Date: 2011-04-27
南京先河工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the acceleration of production rhythm, the temperature of the upper cooling bed of the rolled piece is relatively high, and the oxide scale on the surface increases, resulting in uneven internal structure of the product. There are obvious scar-like defects and low mechanical properties on the outside of the waist and leg joint (referred to as the R part). Severely restricts the production of small H-beams

Method used

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  • Method for fast cooling low-carbon hot-rolling small H-shaped steel
  • Method for fast cooling low-carbon hot-rolling small H-shaped steel

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1: For Q235B and Q345B, the specifications are: 300×150×6.5×9mm, with six sections of side spray and bottom spray fully open, the water pressure is 0.65MPa, and the air pressure is 0.5MPa. The running speed of the rolled piece in the controlled cooling zone is 2.5m / s, the running time of the section steel in the controlled cooling zone is about 11.5s, and the average cooling speed of the rolled piece is 24.2~29.1℃ / s. The cooling method adopts regional cooling control, and adopts different cooling strategies for the cooling parts, so that the temperature drop of the flange part and the R part is relatively large, and the temperature drop is 278 ~ 335 ° C, which meets the requirements of rapid cooling, and the H-shaped steel products are different. The temperature tends to be the same at all places, and the temperature difference between all places is obviously reduced.

[0015] Due to the full opening of the six-stage side spray and the bottom spray, the temperat...

Embodiment 2

[0016] Example 2: For Q235B and Q345B, the specifications are: 300×150×6.5×9mm, the 1st, 2nd, 3rd, 4th stage side spray and bottom spray of the cooling device are fully opened, and the 5th and 6th stage side spray and bottom spray are fully opened Off, the water pressure is 0.65MPa, and the air pressure is 0.5MPa. The running speed of the rolled piece in the controlled cooling zone is 2.5m / s, and the running time of the section steel in the controlled cooling zone is about 7.7s. The designed cooling control mode fully considers the temperature field distribution after H-beam rolling, adopts regional cooling control, and adopts different cooling strategies for the cooled parts, so that the temperature drop of the flange part and the R part is relatively large, and the temperature drop is 227~ 282°C, the average cooling rate of the rolled piece is 29.5-36.6°C / s. The lower flange and R part of the H-beam are kept warm for a long time in a higher temperature zone, the transformat...

Embodiment 3

[0018] Example 3: For Q235B and Q345B, the specifications are: 300×150×6.5×9mm, the 1st, 2nd and 3rd stages of side spray and bottom spray of the cooling device are fully opened, and the 4th, 5th and 6th stage of side spray and bottom spray are fully opened Off, the water pressure is 0.65MPa, and the air pressure is 0.5MPa. The running speed of the rolled piece in the controlled cooling zone is 2.5m / s, and the running time of the section steel in the controlled cooling zone is about 5.8s. The designed cooling control mode takes full account of the temperature field distribution after H-beam rolling, adopts zone cooling control, the temperature drop is 175-231°C, and the average cooling rate of the rolled piece is 30.2-39.8°C / s. Although the cooling rate is high, the cooling time is limited, resulting in a higher temperature in the center of the R part, which makes the self-tempering more severe, and the ferrite structure in the R part is only coarser, with a grain size of 8.0-...

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Abstract

The invention provides a method for fast cooling low-carbon hot-rolling small H-shaped steel, belonging to the technical field of metal pressure processing. The method for fast cooling low-carbon hot-rolling small H-shaped steel is mainly based on the improvement of a cooling-after-rolling device and cooling is carried out by six stages in a high-pressure aerial fog cooling way, wherein each stage comprises four cooling control modules which are respectively arranged at the upper part, the lower part and two sides and are independently controlled and regulated by electromagnetic valves; controlled cooling is performed by regions, and different cooling methods are performed for cooled parts so that a flange part and an R part have larger temperature drop extent so as to fast and uniformly cool the positions of the H-shaped steel. By applying the fast cooling method to Q235 and Q345, the invention enables an H-shaped steel product to have tiny texture grains and larger mechanical property enhancement up to 50 MPa; in addition, the fast cooling method enables the properties of the positions of the H-shaped steel to be more uniform, reduces the cooling wave bending of the H-shaped steel product and enhances the finished product ratio of the H-shaped steel product.

Description

Technical field: [0001] The invention belongs to the field of metal pressure processing, and relates to a method for rapid cooling of low-carbon hot-rolled small H-shaped steel, in particular to a method for rapidly cooling hot-rolled small H-shaped steel represented by Q235 and Q345 after rolling, so as to improve its product structure and increase Comprehensive performance. Background technique: [0002] Hot-rolled H-shaped steel is an economical cross-section profile. Compared with ordinary I-shaped steel, it has the advantages of large section modulus, light weight, and metal saving. Moreover, because the inner and outer sides of the flange are parallel, it can be easily combined into various types. Components of shape and size. Under the condition of bearing the same load, H-beams can save 10% to 15% of metal than ordinary I-beams. The use of H-beams in buildings can reduce the structure by 30% to 40%, and the weight of bridges can be reduced by 15% to 20%. %, which w...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B43/00
Inventor 黄贞益程鼎鲁怀敏孙维苏世怀章小峰
Owner 南京先河工程技术有限公司
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