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Thermal treatment method for improving corrosion resistance of steel plate for marine-atmospheric-corrosion-resistant structure

A heat treatment method, marine and atmospheric technology, applied in the field of metal heat treatment, to achieve the effect of excellent plate shape and excellent resistance

Inactive Publication Date: 2013-12-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no TMCP + sub-temperature normalizing heat treatment method for structural steels resistant to marine atmospheric corrosion, which is well suitable for heat treatment of structural steels resistant to marine atmospheric corrosion

Method used

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  • Thermal treatment method for improving corrosion resistance of steel plate for marine-atmospheric-corrosion-resistant structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The production process of the steel plate for marine atmospheric corrosion resistance structure in this embodiment is carried out by using the steel plate production line or the medium and heavy plate production line, including the converter or electric furnace smelting process, the refining process outside the furnace, the vacuum treatment process, the continuous casting process, and the slab Reheating process, controlled rolling process and controlled cooling process, heat treatment process.

[0017] Among them, the heat treatment method for improving the corrosion resistance of steel plates used in structures resistant to marine atmospheric corrosion is as follows: for steel plates with a thickness of 6mm, the cooling rate after rolling is 15°C / s, the sub-temperature normalizing temperature is 760°C, and the heating time is 10min (that is, 1.6 min / mm), the holding time is 12min (ie 2.0min / mm), and then air-cooled to room temperature. The yield strength of the steel p...

Embodiment 2

[0019] The production process of the steel plate for marine atmospheric corrosion resistance structure in this embodiment is carried out by using the steel plate production line or the medium and heavy plate production line, including the converter or electric furnace smelting process, the refining process outside the furnace, the vacuum treatment process, the continuous casting process, and the slab Reheating process, controlled rolling process and controlled cooling process, heat treatment process.

[0020] Among them, the heat treatment method for improving the corrosion resistance of steel plates used in structures resistant to marine atmospheric corrosion is: for steel plates with a thickness of 16mm, the cooling rate after rolling is 40°C / s, the sub-temperature normalizing temperature is 800°C, and the heating time is 34min (that is, 2.1 min / mm), the holding time is 23min (ie 1.4min / mm), and then air-cooled to room temperature. The yield strength of the steel plate is 50...

Embodiment 3

[0022] The production process of the steel plate for marine atmospheric corrosion resistance structure in this embodiment is carried out by using the steel plate production line or the medium and heavy plate production line, including the converter or electric furnace smelting process, the refining process outside the furnace, the vacuum treatment process, the continuous casting process, and the slab Reheating process, controlled rolling process and controlled cooling process, heat treatment process.

[0023] Among them, the heat treatment method for improving the corrosion resistance of steel plates used in structures resistant to marine atmospheric corrosion is: for steel plates with a thickness of 50mm, the cooling rate after rolling is 35°C / s, the sub-temperature normalizing temperature is 820°C, and the heating time is 55min (that is, 1.1 min / mm), the holding time is 35min (ie 0.7min / mm), and then air-cooled to room temperature. The yield strength of the steel plate is 48...

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Abstract

The invention discloses a thermal treatment method for improving the corrosion resistance of a steel plate for a marine-atmospheric-corrosion-resistant structure. The thermal treatment method is characterized in that a TMCP (thermo-mechanical control process) for rolling the steel plate under the control and then quickly cooling the steel plate is adopted, and the cooling speed is higher than or equal to 15 DEG C / s . The thermal treatment method includes directly feeding the TMCP-state steel plate in a room-temperature state into a non-oxidation roller-hearth type thermal treatment furnace at a furnace temperature, computing a heating period according to a uniform temperature period per unit thickness of 1.0-2.5min / mm, and heating the steel plate so that the temperature of the steel plate reaches a subordinate normalizing temperature which is lower than Ac3 by 20-100 DEG C; computing a heat preservation period for preserving the heat of the steel plate according to a uniform temperature period per unit thickness of 0.5-2.2min / mm after the temperature of the heated steel plate reaches the subordinate normalizing temperature; cooling the steel plate in air until the temperature of the steel plate reaches the room temperature. The thermal treatment method has the advantages that the steel plate for the marine-atmospheric-corrosion-resistant structure is excellent in shape, mechanical property and corrosion resistance, and is excellent in comprehensive corrosion resistance and local corrosion resistance in a marine atmospheric environment.

Description

[0001] technical field [0002] The invention belongs to the field of metal heat treatment, and relates to a sub-temperature normalizing process of a steel plate, in particular to a heat treatment method for improving the corrosion resistance of a steel plate used in a marine atmosphere corrosion-resistant structure. Background technique [0003] Due to high salinity, high humidity and frequent alternation of dry and wet in the coastal area, the rust layer of ordinary weathering steel will peel off and the weather resistance will be reduced. Repeated coating maintenance is required to prevent corrosion of the steel structure and ensure its safety. On the one hand, the coating affects the construction speed, and at the same time, the total cost of the project has increased significantly; on the other hand, the coating has a great degree of pollution to the environment. In the coastal area, the cost of ordinary steel plus initial coating is comparable to that of weathering st...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/60
Inventor 尹雨群王军赵晋斌
Owner NANJING IRON & STEEL CO LTD
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