Method for manufacturing multi-component alloy steel pipe, fastener and guard rail composite layer

Abstract

The present invention discloses a manufacture method for a composite layer of a complex alloy steel pipe, a fastening element, and a protective grating. The composite layer is composed of antiwear layer nitrided martensite, nitrided austenite, nitrided ferrite and multiple compound and a Fe 3 O 4 + iron high anticorrosion structure. The composite layer has the thickness of about 300micron, and the saltfog resistant ability can reach 800 hours. The high anticorrosion complex alloy steel pipe, the fastening element, and the protective grating produced by the present invention have good physical and chemical performances and extremely strong anti-corrosive, high temperature resistant and impact resistant performances. The theoretical service life is sixty years, and the actual service life is above thirty years. The high anticorrosion complex alloy steel pipe, the fastening element, and the building and highway protective grating produced by the present invention are another significant breakthrough in the history of the use of composite materials on the products of the category, solve the problems of various steel pipes, fastening elements, and protective gratings in China, and improve the service life of the product by above 100 times comparing with unprotected steel pipes, fastening elements, and protective gratings.

Description

technical field [0001] The invention relates to a method for manufacturing a composite layer of high anti-corrosion multi-element alloy steel pipes, fasteners, and protective fences for construction and highways. Corrosion, high temperature resistant composite layer. So as to become high-strength, corrosion-resistant, impact-resistant, pressure-resistant, wear-resistant, and pollution-free multi-component composite steel pipes, fasteners, and guardrails. Background technique [0002] In order to improve the performance of steel pipes, fasteners, and guardrails and expand the application field, a composite layer with corrosion resistance and high temperature resistance is made on the surface of metal steel pipes, fasteners, and guardrails. So as to become a high-strength, corrosion-resistant, impact-resistant, pressure-resistant, wear-resistant, non-polluting multi-component composite steel pipe, fasteners, construction and highway guardrails. To meet the urgent needs of th...

AI Technical Summary

Problems solved by technology

[0003] Bimetal clad steel pipes, fasteners, and guardrail products made of existing composite materials and composite methods have relatively simple physical and chemical properties and have fatal flaws. They do not have the characteristics of corrosion resistance, impact resistance, and high strength at the same time. And the cost is extremely high

For example: galvanized, chrome, nickel steel pipes, fasteners, guardrails: not only have poor corrosion resistance, but also seriously pollute the environment (this technology and process has been banned in Europe, the United States and developed countries and regions); processing costs are multivariate Two to five times that of composite products