Rolling Process of Thin Slab Continuous Casting and Rolling Medium and High Carbon Steel

A thin slab continuous casting, medium and high carbon technology, which is applied in the field of steel rolling technology, can solve the problems of fast cooling speed, high strength and hardness of thin slabs, and increased product flow, and achieves the advantages of avoiding annealing process, good mechanical properties and simplifying production process. Effect

Active Publication Date: 2017-04-12
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

[0003] However, high carbon steel has high carbon content and thin slab cooling rate is fast, so medium and high carbon steel produced by thin slab continuous casting and rolling process generally have higher strength and hardness
However, hot-rolled medium-high carbon steel usually needs to be formed and then heat-treated after cold rolling. Therefore, in order to reduce the strength and hardness of medium-high carbon steel, an annealing process is usually added after hot rolling, which leads to an increase in product process and cost. Reduced production efficiency

Method used

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  • Rolling Process of Thin Slab Continuous Casting and Rolling Medium and High Carbon Steel
  • Rolling Process of Thin Slab Continuous Casting and Rolling Medium and High Carbon Steel

Examples

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Effect test

Embodiment 1

[0024] The 30CrMo strip steel is produced in the 7-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The main chemical composition of strip steel 30CrMo is: 0.3%C, 0.28%Si, 0.5%Mn, 0.9%Cr, 0.2%Mo, and the product thickness is 3mm. The thickness of the slab in the continuous casting process is 60mm. The rolling reductions of each pass are shown in Table 1.

[0025] Table 1 Example 1 The reduction rate of each pass

[0026] F1 F2 F3 F4 F5 F6 F7 Reduction rate 55％ 58％ 0 38％ 28％ 25％ 20％

[0027] The soaking temperature is 1080°C, and the soaking time is 30 minutes. The descaling pressure is set to 30Mpa, the rolling start temperature is 980°C, the finish rolling temperature is 750°C, the cooling water pressure between the racks is 0.3Mpa, the strip exit speed...

Embodiment 2

[0037] The strip steel 50CrV4 is produced in the 6-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The chemical composition of strip steel 50CrV4 is: 0.5%C, 0.25%Si, 0.8%Mn, 1.0%Cr, 0.15%V, and the product thickness is 4mm. The thickness of the slab in the continuous casting process is 58mm, and the rolling reduction of each pass is shown in Table 4.

[0038] Table 4 The reduction rate of each pass of embodiment 2

[0039] F1 F2 F3 F4 F5 F6 Reduction rate 50％ 55％ 0 35％ 30％ 25％

[0040] The soaking temperature is 1120°C, and the soaking time is 35 minutes. The descaling pressure is set to 25Mpa, the rolling start temperature is 1030°C, the finish rolling temperature is 800°C, the cooling water pressure between the racks is 0.3Mpa, the strip exit speed at F7...

Embodiment 3

[0050] The 30CrMo strip steel is produced in the 7-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The main chemical composition of strip steel 30CrMo is: 0.3%C, 0.28%Si, 0.5%Mn, 0.9%Cr, 0.2%Mo, and the product thickness is 3mm. The thickness of the slab in the continuous casting process is 60mm. The rolling reductions of each pass are shown in Table 7.

[0051] Table 7 The reduction rate of each pass of embodiment 3

[0052] F1 F2 F3 F4 F5 F6 F7 Reduction rate 56％ 58％ 5％ 38％ 28％ 25％ 20％

[0053] The soaking temperature is 1050°C, and the soaking time is 40 minutes. The descaling pressure is set to 30Mpa, the rolling start temperature is 950°C, the finish rolling temperature is 700°C, the cooling water pressure between the racks is 0.4Mpa, the strip exit ...

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Abstract

The invention provides a rolling technology for high-carbon steel in thin slab casting and rolling. The rolling technology includes the processes of continuous casting, heat evening, scale removing, rolling, inter-stand cooling, laminar cooling, reeling and insulation cover slow cooling. The rolling technology is characterized in that the rolling process includes three stages of Austenite perfect recrystallization rolling, non-recrystallization area Austenite rolling and two-phase area rolling. Medium-and-high-carbon steel structures rolled through the rolling technology are even and fine ferrite and particular pearlite, banded structures can be improved, the mechanical property is good, the annealing process does not need to be conducted before forming, cost is reduced, and quite high practicability is achieved.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, and specifically refers to a thin slab continuous casting and rolling medium-high carbon steel rolling technology. Background technique [0002] Medium-high carbon steel has the characteristics of high hardness and high wear resistance after heat treatment, and is widely used in important pillar industries of the national economy such as mining, machinery, automobiles, and decoration. Since thin slab continuous casting and rolling has the characteristics of fast solidification speed, low heating temperature, and short heating time, it has unique advantages in controlling segregation and decarburization, which can significantly increase the yield of finished products and reduce production costs, making more and more steel mills Transfer medium and high carbon steel to the thin slab continuous casting and rolling production line, such as Zhujiang Iron and Steel (such as CN 101773930 A), Lian...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B37/48B21B37/74
CPCB21B1/463B21B37/48B21B37/74
Inventor 蔡珍韩斌谭文魏兵陈丽娟黄全伟
Owner 武汉钢铁有限公司
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