Seawate-corrosive-resisting steel and its production

Abstract

Seawater-corrosion-resisting steel consists of C 0.04-0.10wt%, Si 0.40-0.50wt%, Mn 0.75-1.30wt%, Nb<=0.020wt%, Ti<=0.025wt%, Al 0.015-0.040wt%, Cu 0.20-0.50wt%, Cr<=0.95wt%, Mo<=0.25wt%, Ca 0.0015-0.0040wt%, P<=0.020wt%, S<=0.005wt%, O<=0.0040wt%, N<=0.0060wt%, H<=0.00025wt%, F and impurities residues. It has excellent mechanical and welding performances and corrosion resistance.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, in particular to a seawater corrosion-resistant steel and a production method thereof. Background technique [0002] Seawater corrosion-resistant steel is designed for tidal current power generation, seawater power generation, seawater temperature difference power generation equipment, large-scale cross-sea bridges on the seashore, submarine containers related to ocean development, various large-scale ocean components used for resource development, and shipbuilding steel. A class of low alloy steels developed. [0003] The most important method to improve seawater corrosion resistance is to rely on reasonable alloy composition design and adopt alloying means. The main alloying elements that can improve the seawater corrosion resistance of steel include: Cu, Cr, P, Al, P, Ni, Ca, Mg, Nb and rare earth elements. With the continuous improvement of iron and steel metallurgical technolog...

AI Technical Summary

Problems solved by technology

[0008] The JP09118919A patent published on May 6, 1997 relates to a method of manufacturing steel for seamless steel pipes. The chemical composition of the steel requires Ni≤0.5, and the heat treatment process of quenching and tempering is required for the same process. On the one hand, it improves Reduce the manufacturing cost of steel, on the other hand make the manufacturing process of steel complicated

[0009] JP08073986 published on March 19, 1996 belongs to Ca-treated steel, but its Ni content is as high as 2.5, which greatly increases the manufacturing cost of steel

[0010] The technologies applied in the above-mentioned several patent documents all contain the precious alloy element Ni. In order to ensure the toughness and corrosion resistance of the steel, the Ni content in some patents is as high as 4 (such as JP11001745), which greatly increases the manufacturing cost of the steel.

Images