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A method for manufacturing a hot-rolled high-carbon steel strip with a single-sided decarburization layer ratio of less than 0.7%

A manufacturing method and decarburization layer technology, applied in metal rolling, manufacturing tools, metal rolling, etc., to achieve the effect of reducing the proportion of single-sided decarburization layer, reducing manufacturing cost, and strong operability

Active Publication Date: 2018-03-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing a hot-rolled high-carbon steel strip with a single-sided decarburized layer ratio of less than 0.7%, which can control the single-sided decarburized layer ratio of the hot-rolled high-carbon steel strip to be less than 0.7%, solving the current problem There is a serious problem of surface decarburization in the production of high-carbon steel products with technology, so as to improve product quality

Method used

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  • A method for manufacturing a hot-rolled high-carbon steel strip with a single-sided decarburization layer ratio of less than 0.7%
  • A method for manufacturing a hot-rolled high-carbon steel strip with a single-sided decarburization layer ratio of less than 0.7%
  • A method for manufacturing a hot-rolled high-carbon steel strip with a single-sided decarburization layer ratio of less than 0.7%

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Effect test

Embodiment 1

[0029] Example 1, such as figure 1 Shown, the high-carbon steel produced by the present embodiment is 65Mn, and its chemical composition is as shown in table 1, and wherein carbon content is 0.65%, slab thickness 60mm, strip steel finished product thickness (strip steel thickness after finish rolling) 4.0 mm, the compression ratio of the strip after finish rolling is 15. The furnace temperature of the continuous casting slab is 850°C, the furnace temperature is 1100°C, and the furnace time is 20 minutes. The air excess coefficient in the heating section of the soaking furnace is 1.26, the soaking section is 1.30, the common section is 1.40, and the residual oxygen in the furnace is 1.5 %, the laminar flow cooling adopts the front stage rapid cooling, and the cooling rate is about 18 ° C / s. The single-side decarburized layer ratio of the product is shown in Table 2.

Embodiment 2

[0030] Example 2, such as figure 2 Shown, the high-carbon steel produced by the present embodiment is 75Cr1, and its chemical composition is as shown in table 1, and wherein carbon content is 0.75%, slab thickness 90mm, strip finished product thickness (strip thickness after finishing rolling) 6.0 mm, the compression ratio of the strip after finish rolling is 15. The furnace entry temperature of the continuous casting slab is 920°C, the exit temperature is 1140°C, and the furnace time is 23 minutes. The air excess coefficient in the heating section of the soaking furnace is 1.30, the soaking section is 1.35, the common section is 1.45, and the residual oxygen in the furnace is 3.8 %, the laminar flow cooling adopts the front-stage rapid cooling, and the cooling rate is about 10°C / s. The single-side decarburized layer ratio of the product is shown in Table 2.

Embodiment 3

[0031] Example 3, such as image 3 As shown, the high-carbon steel produced in this embodiment is SK85, and its chemical composition is as shown in Table 1, wherein the carbon content is 0.85%, the thickness of the cast slab is 90mm, the thickness of the finished strip steel is 5.0mm, and the thickness of the strip steel after finish rolling is The compression ratio is 18. The furnace entry temperature of the continuous casting slab is 900°C, the exit temperature is 1140°C, and the furnace time is 25 minutes. The air excess coefficient in the heating section of the soaking furnace is 1.26, the soaking section is 1.32, the common section is 1.40, and the residual oxygen in the furnace is 1.6 %, laminar flow cooling adopts front-stage rapid cooling, and the cooling rate is about 15°C / s. The single-side decarburized layer ratio of the product is shown in Table 2.

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Abstract

The invention discloses a manufacturing method for a hot-rolled high-carbon steel sheet strip with the single-face decarburized layer ratio smaller than 0.7%. After continuous casting of a steel billet, the thickness H of the continuous-cast billet is controlled to be 55-90 mm, the thickness h of finish-rolled strip steel is 1.5-6.0 mm, and the compression ratio H / h of the finish-rolled strip steel is larger than or equal to 15. The temperature of the continuous-casting billet before entering a soaking pit is 850-950 DEG C, the tapping temperature is 1100-1150 DEG C, and the inside-furnace time is 18-30 min. The air excess coefficient of a heating section of the soaking pit is 1.26-1.30, the air excess coefficient of a soaking section is 1.30-1.35, the air excess coefficient of a public section is 1.40-1.45, and remaining oxygen quantity in the soaking pit is 1.5-4.0%. The cooling rate of laminar cooling is 10-20 DEG C / s, and thus the single-face decarburized layer ratio of the hot-rolled high-carbon steel sheet strip is smaller than 0.7%. The manufacturing method is simple and low in cost, and the quality of the hot-rolled high-carbon steel sheet strip can be improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing high-carbon steel strips, and in particular relates to a method for manufacturing hot-rolled high-carbon steel strips with a single-sided decarburization layer ratio of less than 0.7%. Background technique [0002] High-carbon steel products have a high carbon content (above 0.6%), high hardness, good wear resistance, red hardness and good hardenability, etc., and are mainly used in high-end saw blades, automobiles and hardware appliances. Severe surface decarburization is one of the more prominent quality problems in the manufacturing process of high carbon steel, and the higher the carbon content, the more obvious the surface decarburization, which affects the performance of high carbon steel, such as surface hardness, wear resistance and fatigue resistance etc. will cause adverse effects. At present, high-quality high-carbon steel strips require that the ratio of single-sided decarburize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B45/02B22D11/00
CPCB21B1/463B21B45/0203B22D11/001
Inventor 汪水泽毛新平蔡珍孙宜强甘晓龙徐进桥李国彬
Owner 武汉钢铁有限公司
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