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A kind of boron added steel and production method thereof

A technology of boron steel and molten steel, applied in the field of boron-added steel and its production based on twin-roll casting and rolling process, can solve the problem of poor surface quality and edge quality of finished strip steel, poor quality of cast strip edge, hot-rolled strip steel plate Shape difference and other problems, to solve the effect of poor surface quality, improve edge quality, and reduce the difficulty of hot rolling

Active Publication Date: 2021-09-24
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned technical problems, the object of the present invention is to provide a boron-added steel and its production method based on twin-roll casting and rolling process, so as to solve the poor shape of the cast strip, the fracture of the cast strip, and the edge of the cast strip during the continuous casting process. Poor quality, difficult hot rolling, poor shape of hot-rolled strip, poor surface quality and edge quality of finished strip, etc.

Method used

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  • A kind of boron added steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Smelting

[0042] The chemical composition of molten steel is: C: 0.05wt%, Mn: 2.1wt%, Si: 0.15wt%, B: 0.0008wt%, Nb: 0.03wt%, and the balance is Fe and impurity elements.

[0043] 2) Thin strip continuous casting

[0044] Thin strip continuous casting is carried out by passing the above molten steel through a pair of counter-rotating casting rolls. The width of the edge region of the casting roll is 35 mm, the arithmetic mean deviation of the texture profile is 5 μm, and the average spacing of the microscopic roughness of the texture profile is 321 μm. The width of the transition zone in the width direction of the casting roll is 15 mm, the arithmetic average deviation of the texture profile is 8 μm, and the average spacing of the microscopic roughness of the texture profile is 385 μm. The arithmetic average deviation of the texture profile in the middle region of the casting roll is 16 μm, and the average pitch of the microscopic unevenness of the texture profile...

Embodiment 2

[0049] 1) Smelting

[0050] The chemical composition of molten steel is: C: 0.07wt%, Mn: 0.40wt%, Si: 1.40wt%, B: 0.001wt%, and the balance is Fe and impurity elements.

[0051] 2) Thin strip continuous casting

[0052] Thin strip continuous casting is carried out by passing the above molten steel through a pair of counter-rotating casting rolls. The width of the edge region of the casting roll is 25 mm, the arithmetic mean deviation of the texture profile is 3 μm, and the average pitch of the microscopic unevenness of the texture profile is 260 μm. The width of the transition zone in the width direction of the casting roll is 18 mm, the arithmetic mean deviation of the texture profile is 10 μm, and the average spacing of the microscopic roughness of the texture profile is 317 μm. The arithmetic average deviation of the texture profile in the middle region of the casting roll is 12 μm, and the average pitch of the microscopic unevenness of the texture profile is 519 μm. The...

Embodiment 3

[0057] 1) Smelting

[0058] The chemical composition of molten steel is: C: 0.02wt%, Mn: 1.60wt%, Si: 0.40wt%, B: 0.0025wt%, Ti: 0.025wt%, and the balance is Fe and impurity elements.

[0059] 2) Thin strip continuous casting

[0060] Thin strip continuous casting is carried out by passing the above molten steel through a pair of counter-rotating casting rolls. The width of the edge region of the casting roll is 20 mm, the arithmetic mean deviation of the texture profile is 1 μm, and the average spacing of the microscopic unevenness of the texture profile is 175 μm. The width of the transition zone in the width direction of the casting roll is 9 mm, the arithmetic average deviation of the texture profile is 13 μm, and the average spacing of the microscopic roughness of the texture profile is 272 μm. The arithmetic average deviation of the texture profile in the middle region of the casting roll is 23 μm, and the average pitch of the microscopic unevenness of the texture prof...

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Abstract

The invention relates to a boron-added steel and a production method thereof. The components of the molten steel include C≤0.10wt%, Mn≤2.50wt%, Si≤1.50wt%, and B≤0.01wt% in terms of mass fraction. The continuous casting speed of the molten steel is ≤80m / min, the temperature of the cast strip is 1400-1490°C after being exported, and the thrust of the side baffle is above 1000N. The casting roll is divided into five zones across its width, and a different surface texture is machined in each zone. The width of the edge area is ≤40mm, the arithmetic average deviation of the texture profile is ≤6μm, and the average spacing of the microscopic roughness of the texture profile is ≤350μm. The width of the transition zone is ≤20mm. The arithmetic average deviation of the texture profile in the middle area is 9-25 μm, and the average spacing of the microscopic roughness of the texture profile is 300-850 μm. The invention effectively solves the technical problems such as poor cross-sectional profile of the cast strip, poor stability of the cast strip, poor quality of the edge of the cast strip, continuous casting broken strip, difficulty in hot rolling and the like in the twin-roll continuous casting process of the boron-added steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel, and more specifically, relates to a boron-added steel and a production method thereof based on a twin-roll casting and rolling process. Background technique [0002] my country's iron and steel industry is developing rapidly, and the domestic export steel coil data is increasing year by year. Export steel products have also gradually developed from ordinary carbon steel products to a series of low-alloy high-strength steel products, chromium-added steel products, and boron-added steel products. [0003] At present, the main boron-added steel hot-rolled strip steel produced in China is mainly traditional continuous casting and rolling. The molten steel is cast into a 220mm thick billet through continuous casting, and then undergoes multi-pass hot rolling such as rough rolling and finishing rolling. It is made into hot-rolled strip steel products, and the main thickness specifications are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/00C22C38/02C22C38/04C21D8/02
CPCC22C33/04C22C38/02C22C38/04C22C38/002C21D8/0226C21D8/0263C22C38/12C22C38/14B22D11/0622B22D11/0651B22D11/0665B22D11/001
Inventor 陈爱华李化龙施一新周东升吴荣洲翟义庆刘新院李婷婷
Owner SHAGANG GROUP