Weathering resistant steel for low-cost 550MPa hot rolling container and manufacturing method thereof

A manufacturing method and container technology, applied in the field of high-strength steel production, can solve the problems of high steel cost, and achieve the effects of low cost, good corrosion resistance, and easy production

Active Publication Date: 2018-01-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steel also contains precious metals Nb and Mo, and the cost of the steel is relatively high

Method used

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  • Weathering resistant steel for low-cost 550MPa hot rolling container and manufacturing method thereof
  • Weathering resistant steel for low-cost 550MPa hot rolling container and manufacturing method thereof
  • Weathering resistant steel for low-cost 550MPa hot rolling container and manufacturing method thereof

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Embodiment Construction

[0030] The technical problems involved in the present invention are solved by the following technical solutions: a low-cost 550MPa grade hot-rolled weathering steel for containers and its manufacturing method, the mass percentage of its chemical composition is: C 0.049%~0.069%, Si 0.20%~0.30% , Mn 0.51%~0.79%, P≤0.020%, S≤0.006%, Als 0.015%~0.045%, Cr 0.31%~0.41%, Ni0.079%~0.099%, Cu 0.21%~0.29%, Ti 0.057% ~0.077%, N≤0.006%, the rest is Fe and unavoidable impurities. It is smelted in a converter, then refined outside the furnace, and cast to obtain a continuous casting slab. The thickness of the continuous casting slab is 200~230mm, and the continuous casting slab is sent to the hot rolling production line. Flow cooling, the cooling speed is greater than 20°C / s, and the coiling temperature is 619-649°C. After coiling, it enters the slow cooling hood for slow cooling. Thickness ≤ 2.0mm, needs to be leveled.

[0031] The following examples are used to specifically illustrate ...

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Abstract

The invention discloses low-cost 550MPa hot-rolled container weathering steel and a manufacturing method thereof. Steel contains C 0.049%~0.069%, Si 0.20%~0.30%, Mn 0.51%~0.79%, P≤0.020%, S≤0.006%, Als 0.015%~0.045%, Cr 0.31%~0.41%, Ni 0.079 %~0.099%, Cu 0.21%~0.29%, Ti 0.057%~0.077%, N≤0.006%, and the rest are Fe and unavoidable impurities. The thickness of the slab is 200-230mm, the heating temperature of the slab is ≥1250°C, the starting temperature of the finishing rolling is 1080-1100°C, the finishing rolling temperature is 921-949°C, laminar cooling is adopted after rolling, and the cooling rate is >20°C /s, the coiling temperature is 619~649℃, after coiling, enter the slow cooling hood for slow cooling, if the thickness of the finished product is ≤2.0mm, it needs to be leveled. The thickness of the steel plate is 1.5~5.0mm, which is used in the container industry.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production, and in particular relates to a low-cost 550MPa grade hot-rolled weathering steel for containers and a manufacturing method thereof. Background technique [0002] In the container manufacturing industry, 345MPa-grade hot-rolled thin steel plates (high weather-resistant steel plates) with atmospheric corrosion resistance (high weather resistance steel plates) with Cu, P, Cr, and Ni as the main alloy components are generally used to manufacture outer plates and inner frames. The steel plates used for container manufacturing reach more than 3 million tons every year, and with the development of the container transportation industry, the amount of steel required by this industry is also increasing year by year. As people pay more and more attention to issues such as mineral resources, energy, and manufacturing costs, lightweight and long-life containers have become a trend. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/08C22C38/16C22C38/14C21D8/02
Inventor 刘志伟郭晓宏张瑞琦刘凤莲高磊王洪海严平沅乔磊钟莉莉杨玉
Owner ANGANG STEEL CO LTD
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