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Boron and chromium-containing ultralow-carbon tin plate with hardness HR30Tm within 55+/-4 and manufacturing method thereof

A technology of carbon tinplate and manufacturing method, which is applied in the field of subdivided tinplate products, can solve the problems that the manufacturing method has not been reported, and cannot meet the aging hardness value at the same time, so as to achieve good surface quality and plate shape, and is easy to implement , cost reduction effect

Inactive Publication Date: 2020-09-04
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

None of the above inventions controls the content of Cr and B elements, and none of them can satisfy aging resistance and a certain hardness value at the same time
[0007] To sum up, there are many people at home and abroad who use ultra-low carbon containing Ti or Nb as the original plate of soft tinplate, and the proposed schemes are different, but the ultra-low carbon containing boron and chromium with hardness HR30Tm within 55±4 Low-carbon tinplate and its manufacturing method have not been reported yet

Method used

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  • Boron and chromium-containing ultralow-carbon tin plate with hardness HR30Tm within 55+/-4 and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] An ultra-low-carbon tinplate containing boron and chromium with a hardness of HR30Tm within 55±4, its chemical composition and weight percentage are: C: 0.001%, Si: 0.01%, Mn: 0.65%, P: 0.011%, S: 0.012%, Als: 0.01%, Ti: 0.04%, B: 0.0012%, Cr: 0.025%, N: 0.0025%, and the rest are Fe and unavoidable impurities.

[0039] The specific implementation process of the ultra-low-carbon tinplate: starting from the desulfurization of molten iron, after smelting in a converter, the molten steel is vacuum-treated, and then continuously cast into billets, and the continuously cast billets are hot-rolled into steel strips, and then hot-rolled The steel strip is pickled, and under the condition of a reduction rate of 85%, it is cold-rolled with a five-stand continuous rolling mill, and then undergoes chemical degreasing, electrolytic degreasing, and continuous annealing furnace (CA) for annealing. The annealing temperature is 710 ° C. The annealing time is 45s, and then it is leveled ...

Embodiment 2

[0042] An ultra-low-carbon tinplate containing boron and chromium with a hardness of HR30Tm within 55±4, its chemical composition and weight percentage are: C: 0.003%, Si: 0.02%, Mn: 0.7%, P: 0.010%, S: 0.008%, Als: 0.03%, Ti: 0.35%, B: 0.0025%, Cr: 0.030%, N: 0.0035%, and the rest is Fe and unavoidable impurities.

[0043] The specific implementation process of the ultra-low-carbon tinplate: starting from the desulfurization of molten iron, after smelting in a converter, the molten steel is vacuum-treated, and then continuously cast into billets, and the continuously cast billets are hot-rolled into steel strips, and then hot-rolled The steel strip is pickled, and under the condition of a reduction rate of 81%, it is cold-rolled with a five-stand continuous rolling mill, and then undergoes chemical degreasing, electrolytic degreasing, and continuous annealing furnace (CA) for annealing. The annealing temperature is 720°C. The annealing time is 40s, and then it is leveled and ...

Embodiment 3

[0046] An ultra-low-carbon tinplate containing boron and chromium with a hardness of HR30Tm within 55±4, its chemical composition and weight percentage are: C: 0.003%, Si: 0.02%, Mn: 0.75%, P: 0.013%, S: 0.006%, Als: 0.06%, Ti: 0.02%, B: 0.0035%, Cr: 0.028%, N: 0.004%, and the rest is Fe and unavoidable impurities.

[0047] The specific implementation process of the ultra-low-carbon tinplate: starting from the desulfurization of molten iron, after smelting in a converter, the molten steel is vacuum-treated, and then continuously cast into billets, and the continuously cast billets are hot-rolled into steel strips, and then hot-rolled The steel strip is pickled, and under the condition of a reduction rate of 93%, it is cold-rolled with a five-stand continuous rolling mill, and then undergoes chemical degreasing, electrolytic degreasing, and continuous annealing furnace (CA) for annealing. The annealing temperature is 730°C. The annealing time is 60s, and then smoothing and tinn...

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Abstract

The invention discloses a boron and chromium-containing ultralow-carbon tin plate with the hardness HR30Tm within 55+ / -4. The boron and chromium-containing ultralow-carbon tin plate comprises the following chemical components in percentage by weight: not greater than 0.004% of C, not greater than 0.030% of Si, 0.6-0.8% of Mn, not greater than 0.015% of P, not greater than 0.013% of S, not greaterthan 0.060% of Als, not greater than 0.04% of Ti, 0.0005-0.0035% of B, 0.015-0.055% of Cr, not greater than 0.004% of N, and the balance Fe and inevitable impurities. The tin plate is excellent in aging resistance and corrosion resistance, has a certain hardness value, high purity and high ductility, generates no cracks in machining formation and welding, and is free of extension strain marks after machining formation.

Description

technical field [0001] The invention relates to a boron- and chromium-containing ultra-low-carbon tinplate with a hardness of HR30Tm within 55±4 and a manufacturing method thereof, which are applied to subdivided tinplate product fields such as wide-diameter chemical tanks and milk powder can tops and bottom covers. Background technique [0002] It is used in subdivided tinplate products such as wide-diameter chemical tanks and milk powder tank tops and bottoms. It requires excellent aging resistance and corrosion resistance, and has a certain hardness value, high purity, high ductility, and high surface quality. No cracking occurs during forming and welding, and no tensile strain marks after forming. Among various performances, the aging resistance and the hardness value of HR30Tm within 55±4 are contradictory, and it is very difficult to achieve them at the same time. There are many factors that affect the aging resistance of tinplate, such as the composition of the origi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/50C22C38/54C25D3/30C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/50C22C38/54C25D3/30
Inventor 杨宏武白会平杜蓉涂元强谢芬雷泽红徐希义
Owner 武汉钢铁有限公司