Steel resistant to marine corrosion

Abstract

The invention relates to a steel resistant to marine corrosion. The steel is composed of the following components in percentage by weight: 0.02-0.08 percent of C, 0.08-0.20 percent of Si, 0.30-0.80 percent of Mn, 0.10-0.35 percent of Ni, 0.30-1.30 percent of Cr, 0.20-0.40 percent of Cu, 0.03-0.06 percent of Ti, not more than 0.03 percent of P, 0.01-0.03 percent of S, not more than 0.20 percent of Mo, not more than 0.04 percent of RE and the balance of Fe and inevitable micro-impurities. Cheap laterite-nickel ore resources are utilized to replace part of iron ore resources to produce the steel resistant to the marine corrosion, nickel, chromium and other elements in laterite-nickel ore are fully utilized, and a nickel-chromium alloy does not need to be added, so that the production process is simplified, the cost is reduced, the toughness of profile steel is improved, and particularly, the marine corrosion resistance is obviously improved.

Description

technical field [0001] The invention relates to the field of medium and low alloy steel smelting, in particular to a marine corrosion-resistant steel. Background technique [0002] my country has a large number of offshore oil and gas resources, especially the deep sea, which has great potential for exploration and development. The carrier of marine steel structures is a spatially complex structure composed of plates and profiles. From the perspective of my country's offshore engineering development status and future development trends, it is expected that " During the 12th Five-Year Plan period, the annual demand for various marine engineering steels will reach 3 million to 3.5 million tons. [0003] The prospect of steel for marine energy construction is broad. In view of the vast shallow sea area of ​​my country's continental shelf and abundant offshore wind resources, the construction of offshore wind farms has broader prospects than the construction of land wind farms. I...

AI Technical Summary

Problems solved by technology

[0006] Laterite nickel ore, also known as laterite ore, is an important raw material for extracting nickel metal or producing nickel-iron alloy. However, due to the mechanism and conditions of laterite ore formation, a large part of laterite ore has low nickel content, less than 0.6%. The content is about 50%, and 1.5%-5% of chromium is associated at the same time. If it is used to extract nickel metal or produce ferronickel, the production cost is extremely high and it is very uneconomical; as an ordinary iron ore, its grade is low, and the associated nickel The characteristics of chromium element can only be added at a low price as a small amount of ore blending. Therefore, this kind of ore is generally used as an abandoned ore. A new type of high-strength and low-cost atmospheric corrosion-resistant and resistant to this kind of mine resources has been developed. High value-added low-nickel-chromium structural steel corroded by seawater has broad application prospects