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High-strength fastener for bridge in marine atmosphere and humid environments

A wet environment, marine atmosphere technology, applied in the field of fasteners, can solve the problems of easy damage of the surface coating, poor resistance to hydrogen embrittlement, loss of protection, etc., to achieve excellent anti-rust, improve corrosion resistance, and delay corrosion Effect

Active Publication Date: 2022-02-18
LUOYANG SUNRUI SPECIAL EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the existing problems such as the poor hydrogen embrittlement resistance of steel used for fasteners used in bridges in marine atmospheres and humid environments, the surface coating is easily broken and loses its protective effect, etc., the present invention The purpose is to provide a steel for high-strength fasteners suitable for a wide range of diameter specifications and good hydrogen embrittlement resistance, as well as a surface protection coating with high corrosion resistance, strong mechanical damage resistance, and no hydrogen embrittlement.

Method used

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  • High-strength fastener for bridge in marine atmosphere and humid environments
  • High-strength fastener for bridge in marine atmosphere and humid environments
  • High-strength fastener for bridge in marine atmosphere and humid environments

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Embodiment 1

[0048] The chemical composition (mass percentage) of the steel for high-strength bolts used in the high-strength bolts for bridges with wide-range diameters and good hydrogen embrittlement resistance of the present invention is: C 0.07-0.25%, Si 0.20-0.50% , Mn 0.20-0.80%, S≤0.035%, P≤0.035%, Ni 1.00-5.50%, Cr 0.35-1.50%, Mo 0.30-1.50%, V 0.02-0.10%, Cu≤0.30%, the balance is Fe and trace impurities.

[0049] The steel type described in the present invention is suitable for producing high-strength bolts with a diameter of ≤150mm.

[0050] The cathodic dense coating for high-strength bolts in the present invention has a composite sandwich structure: Ni-W-P / Ni / Ni-Co, so as to obtain more excellent corrosion resistance and mechanical damage resistance. The corrosion potential difference between Ni-Co and Ni layer is controlled at 100mV, and the corrosion potential difference between the innermost layer of Ni-W-P and the substrate and the middle Ni layer is controlled at about 150...

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Abstract

The invention discloses a high-strength fastener for a bridge in marine atmosphere and humid environments. The high-strength fastener consists of a base body and a plating layer plated on the base body. The plating layer is a cathode compact composite plating layer which is of a three-layer structure, wherein the inner plating layer and the outer plating layer are made of nickel alloy or cobalt alloy, and the middle plating layer is a unit metal plating layer. The corrosion potential of the base body is smaller than that of the inner plating layer attached to the base body; the corrosion potential of the inner plating layer attached to the base body is smaller than that of the middle plating layer; and the corrosion potential of the plating layer of the outer plating layer is smaller than that of the middle plating layer. The tensile strength and the yield strength of the high-strength fastener range from 1000 Mpa to 1200 Mpa. The product is applied to bridge component connecting devices in marine atmosphere and humid environments, and has excellent corrosion resistance and fracture resistance.

Description

technical field [0001] The invention belongs to the technical field of fasteners, in particular to a high-strength fastener for bridges in marine atmospheres and humid environments. Background technique [0002] High-strength bolts are an important way to connect steel structure bridges. They have the advantages of high efficiency, good performance, safety and reliability, and are widely used in engineering. At present, the material performance grade of bolts for steel structure connection is mainly 8.8-10.9, and the materials are mainly conventional engineering steels such as 35, 45, 20MnTiB, 35VB, 40Cr and 35CrMo, and the use specifications are usually ≤ M30. Among them, 20MnTiB steel is an important steel type used in the (M12-M24) specification bolts for steel structure bridges in my country. In view of the poor hardenability and mechanical properties of 20MnTiB steel, it is difficult to meet the requirements of larger diameter specifications such as M27, M30 and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46B32B15/01
CPCC22C38/44C22C38/46C22C38/04C22C38/02B32B15/01
Inventor 孙永伟王灵水范芳雄
Owner LUOYANG SUNRUI SPECIAL EQUIP
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