600Mpa level weather-proof bolting steel self-corrosion matching method for transmission tower

Abstract

The invention relates to a 600Mpa level weather-proof bolting steel self-corrosion matching method for a transmission tower, and belongs to the technical field of weather-proof bolting steel for a transmission tower frame. The method comprises the steps that firstly, high-strength bolting steel which meets the use requirements of the 600Mpa level transmission tower frame and has high atmosphere environment corrosion resistant and fire-resistant performance is selected, wherein the weight percent of Cr, Ni and Cu elements meets the formula that 1 / 2[Cr]+1 / 6[Ni]+1 / 3[Cu]+2 / 5[Cu].[Ni]-1 / 5[Cr].[Ni]-2 / 5[Cu].[Cr].[Ni] is greater than or equal to 0.45 but is smaller than or equal to 0.55; the self-corrosion coupling current of the produced high-strength screw bolt and matched angle iron is controlled to be within + / -20muA. The method has the advantages that the method is used for the matched connection use of a coating-free iron tower structure; excellent atmosphere corrosion performance and self-corrosion matching performance are realized.

Description

technical field [0001] The invention belongs to the technical field of weather-resistant bolt steel for power transmission towers, and in particular relates to a self-corrosion matching method for 600Mpa-level weather-resistant bolt steel for power transmission towers. Background technique [0002] It has been more than 40 to 50 years since the application of environmentally friendly weathering steel in transmission poles and towers in foreign countries, and the application in the United States and Japan was earlier and more extensive. In 1961, the United States used non-spraying environmentally friendly weathering steel on steel pipe poles for transmission lines in the suburbs of Pittsfield, Massachusetts. In 1975, Japan applied the SMA series of environmentally friendly weathering steel in the 77kV double-circuit angle steel test tower; in recent years, more than 100 environmentally friendly weathering steel transmission lines have been designed and applied in the United S...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a self-corrosion matching method for 600Mpa-level weather-resistant bolt steel for power transmission towers, which solves the problem that ordinary 600Mpa-level bolts do not have corrosion resistance to atmospheric environments, but the surface is galvanized and requires anti-corrosion coating maintenance every 3 to 5 years As well as problems such as health hazards and environmental pollution caused by the coating process, high coating costs, etc.

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