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Structural steel with excellent weather resistance

A technology for structural and steel materials, applied in the field of steel materials for components, to achieve the effects of practical weldability, excellent weather resistance, and excellent weather resistance

Inactive Publication Date: 2015-09-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] On the other hand, although there is no mention of weather resistance in high-air suspended salt environments such as near the coast, as a ship's ballast tank (ballast tank) directly splashed by sea water, the severe corrosion environment (corrosion environment) ) for corrosion-resistant steel materials used in Patent Document 5 discloses corrosion-resistant steel materials for ships containing W and Cr, and containing Sb, Sn, Ni, etc.

Method used

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  • Structural steel with excellent weather resistance
  • Structural steel with excellent weather resistance
  • Structural steel with excellent weather resistance

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Experimental program
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Effect test

Embodiment

[0113] The steel with the chemical composition shown in Table 1 was melted, heated to 1150°C, hot rolled, and air cooled to room temperature, and a steel plate with a thickness of 6 mm was produced as a trial. Next, a test specimen (test specimen) of 35 mm×35 mm×5 mm was cut out from the obtained steel plate. The surface of the test piece was ground by grinding processing so that the surface roughness (surface roughness) Ra was 1.6 μm or less, and the edge face and the back side were sealed with tape. ), and the surface was also sealed with an adhesive tape so that the area of ​​the surface exposed portion (exposed area) was 25 mm×25 mm.

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Abstract

Provided is a low-cost structural steel exhibiting superior weather resistance. Specifically, a structural steel containing, in mass%: 0.1 - 1.00% inclusive of Cu; at least 0.10 - less than 0.6% of Ni; 0.05 - 1.00% inclusive of W; and further containing either or both of 0.005 - 0.200% inclusive of Nb and 0.005 - 0.200% inclusive of Sn. R value = 2.0 mass%. R value = (R1 value + R2 value) 0.5, R1 value = [Cu] × 0.2 + [Ni] × 3 + [W] × 4 + [Nb] × 20 + [Sn] × 8.5, R2 value = (Log 1.5([W]2 + 0.002) + 16) × ((Log2([Nb] × 0.1 + 0.001) + 10) + (Log2([Sn] × 0.1 + 0.001) + 10) × 0.75) × 0.5 (whereby [M] represents the content of the element M (mass%), and if none is present, [M] is 0).

Description

technical field [0001] The present invention mainly relates to steel structures (Steel Structures) used outdoors such as bridges, and in particular to steel structures suitable for use in environments where high air-borne salts (air-borne salt) are present near the coast (coastal environment) and require weather resistance. (atmospheric corrosion resistance) component steel. Background technique [0002] Conventionally, weathering steel (weathering steel) has been used for steel structures used outdoors, such as bridges. Weather-resistant steel is exposed to the atmosphere (atmospheric environment) by covering the surface with a highly protective rust layer (rust layer) rich in Cu, P, Cr, Ni and other alloy elements to reduce the corrosion rate (corrosion rate) ) significantly reduced steel. It is known that, taking advantage of its excellent weather resistance, bridges using weather-resistant steel can often withstand decades of use in a non-painted (paintless) state. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/60
CPCC22C38/48C22C38/008C22C38/42C22C38/04C22C38/02C22C38/001C22C38/08C22C38/002C22C38/16C22C38/06C22C38/44C22C38/60
Inventor 三浦进一鹿毛勇村濑正次星野俊幸
Owner JFE STEEL CORP