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Isotropic cold-rolled soft tinned plate and production method thereof

An isotropic, production method technology, applied in the field of iron and steel, can solve the problems of low C content and high production cost, and achieve the effect of low hardness value, low cost and improved yield

Inactive Publication Date: 2013-12-25
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the substrate composition disclosed in this patent also has low C content, and alloy elements Nb and / or Ti are added, which belongs to IF steel, and the production cost is high
[0004] In summary, due to the use of ultra-low carbon steel, low carbon steel and / or the addition of Ti and Nb elements in the production of soft tinplate, the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The weight percentages of chemical components are: C: 0.055, Si: 0.01, Mn: 0.55, P: 0.009, S: 0.012, Als: 0.015, N: 0.0025, and the rest are Fe and unavoidable impurities. After the steel is desulfurized by molten iron, and then smelted in a converter, the molten steel is subjected to RH vacuum treatment, and then the treated molten steel is continuously cast into billets. , Under the condition of reduction rate of 85%, after cold rolling with HC rolling mill, annealing through electrolytic degreasing and full hydrogen bell furnace annealing (BA), full hydrogen bell annealing temperature is 660 ℃, annealing time is 18h , and then double-machine leveling and tin plating are performed to obtain a cold-rolled soft tin-plated sheet with a thickness of 0.25mm. After testing, the grain size is 8, the hardness value (HR30Tm) is 52, the tensile strength is 310MPa, the elongation is 43%, the acid leaching time lag value (PL) is 1.5s, and the cupping value is 9.3mm. |Δr| was 0.0...

Embodiment 2

[0030]The weight percentages of chemical components are: C: 0.060, Si: 0.02, Mn: 0.60, P: 0.011, S: 0.009, Als: 0.005, N: 0.003, and the rest are Fe and unavoidable impurities. After the steel is desulfurized by molten iron, and then smelted in a converter, the molten steel is subjected to RH vacuum treatment, and then the treated molten steel is continuously cast into billets. , Under the condition of reduction rate of 90%, after cold rolling with HC rolling mill, it is annealed by electrolytic degreasing, full hydrogen bell furnace annealing (BA), full hydrogen bell annealing temperature is 655 ℃, annealing time is 20h , and then double-machine leveling and tin plating are performed to obtain a cold-rolled soft tin-plated sheet with a thickness of 0.22 mm. After testing, the grain size is 7, the hardness value (HR30Tm) is 50, the tensile strength is 300MPa, the elongation is 45%, the acid leaching time lag value (PL) is 1.0s, and the cupping value is 9.6mm. |Δr| was 0.02. ...

Embodiment 3

[0032] The weight percentages of chemical components are: C: 0.080, Si: 0.01, Mn: 0.55, P: 0.015, S: 0.007, Als: 0.025, N: 0.0040, and the rest are Fe and unavoidable impurities. After the steel is desulfurized by molten iron, and then smelted in a converter, the molten steel is subjected to RH vacuum treatment, and then the treated molten steel is continuously cast into billets. , Under the condition of reduction rate of 91%, after cold rolling with HC rolling mill, it is annealed by electrolytic degreasing, full hydrogen bell furnace annealing (BA), full hydrogen bell annealing temperature is 650 ℃, annealing time is 19.5 h, and then double-machine leveling and tin plating are performed to obtain a cold-rolled soft tin-plated sheet with a thickness of 0.35 mm. After testing, the grain size is 9, the hardness value (HR30Tm) is 55, the tensile strength is 350MPa, the elongation is 42%, the acid leaching time lag value (PL) is 2.0s, and the cupping value is 9.1mm. |Δr| is 0.1....

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Abstract

The invention discloses an isotropic cold-rolled soft tinned plate and a production method thereof. The soft tinned plate comprises a primary plate and a tin coating, wherein the primary plate comprises the following chemical components in percentage by weight: 0.055-0.080% of C, at most 0.02% of Si, 0.55-0.65% of Mn, at most 0.015% of P, at most 0.012% of S, 0.005-0.025% of Als, at most 0.004% of N, and the balance of Fe and inevitable impurities. The production method sequentially comprises the following steps: molten iron desulfurization, converter smelting, RH vacuum treatment, continuous casting, hot continuous rolling, acid washing, cold rolling, electrolytic degreasing, full-hydrogen furnace cover annealing at 650-660 DEG C, flattening and electrotinning, wherein the cold rolling is performed by an HC rolling mill in a five-six pass mode, and the reduction rate is 85-93%. The tinned plate disclosed by the invention has the advantages of isotropy, low hardness value and high corrosion resistance; and the method is simple and convenient, and is low in cost and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and in particular relates to an isotropic cold-rolled soft tinplate and a production method thereof. Background technique [0002] Soft tinplate products for food cans require excellent planar isotropy and corrosion resistance, as well as high purity, high ductility, high surface quality, low Δr value, and no cracking during processing. Among them, isotropy and corrosion resistance are the most important properties of soft tin plate for food cans. There are many factors affecting the isotropy and corrosion resistance of soft tinplate, such as original plate composition, cold rolling reduction, recrystallization annealing process, surface cleanliness of original plate before electroplating, electroplating process and reflow process. [0003] In order to improve the processing performance and corrosion resistance of soft tin plate for food cans, researchers have done a lot of work. For exa...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02C25D3/30
Inventor 涂元强白会平杜蓉柳长福宋乙峰蔡捷黄道兵郭玉华
Owner WUHAN IRON & STEEL (GROUP) CORP
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