Sulfuric acid dew point corrosion-resistant steel

A technology that resists sulfuric acid and corrodes steel, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of easy segregation, reduced productivity, and increased cost, and achieves excellent resistance to sulfuric acid dew point corrosion, as well as manufacturability and fatigue resistance. excellent effect

Active Publication Date: 2019-04-16
JFE STEEL CORP
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  • Application Information

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Problems solved by technology

[0007] On the other hand, when Cu having a melting point lower than Fe or Sb that is prone to segregation is added, slab cracks and slab surface flaws occur du

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Examples

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[0138] Example

[0139] The steel (the balance being Fe and inevitable impurities) having the composition shown in Table 1 was smelted in a converter, and a billet with a thickness of 200 mm was produced by a continuous casting method. After cooling the steel slab, it was heated to 1200°C and hot rolled to produce a hot rolled steel sheet having a thickness of 4.5 mm.

[0140] It should be noted that in hot rolling, the reduction ratio is set to 97.75%, the finishing temperature of finishing rolling is set to 850°C, the coiling temperature is set to 560°C, and the average cooling from 800°C to 650°C The speed is set as shown in Table 2.

[0141] For the hot-rolled steel sheet thus obtained, the area ratio and Vickers hardness of each phase in the steel structure were measured by the method shown below, as well as sulfuric acid dew point corrosion resistance, manufacturability, bendability, and fatigue resistance. Evaluation. These results are shown in Table 2.

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Abstract

This sulfuric acid dew point corrosion-resistant steel has a prescribed component composition, and the content of S, Cu and Sb in said component composition satisfy expression (1) below and the content of Cu, Ni, Sb and Co satisfy the relation of expression (2) below. 0.50 <= [%Cu] / (10x[%S]+[%Sb]) <= 5.00 (1) 0.50 <= ([%Ni]+5x[%Co]) / ([%Cu]+[%Sb]) <= 2.50 (2), wherein [%S], [%Cu], [%Ni], [%Co] and [%Sb] are the content (mass%) of S, Cu, Ni, Sb and Co, respectively, in the component composition.

Description

technical field [0001] The present invention relates to a sulfuric acid dew point corrosion-resistant steel used as a constituent material of heat exchangers, tanks, equipment, etc. in an environment in contact with sulfuric acid or in an environment where a sulfuric acid dew point occurs, and particularly relates to a steel having excellent sulfuric acid dew point corrosion resistance It is a sulfuric acid dew point corrosion-resistant steel that is also excellent in manufacturability, bendability, and fatigue resistance. Background technique [0002] In the heat exchangers or flues of boilers or thermal power plants that burn fuels such as heavy oil or coal containing sulfur, the sulfur oxides contained in the exhaust gas will condense into sulfuric acid as the temperature decreases, causing serious corrosion , The so-called "sulfuric acid dew point corrosion" has become a problem. [0003] As a solution to this problem of sulfuric acid dew point corrosion, steels resista...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/60C21D9/46
CPCC21D9/46C22C38/00C22C38/60C22C38/42
Inventor 猪原康人村濑正次菊池启泰桐本俊司
Owner JFE STEEL CORP
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