Submerged arc welding wire suitable for welding cargo oil tank of crude oil tanker

Abstract

A submerged arc welding wire suitable for welding a cargo oil tank of a crude oil tanker comprises the following chemical compositions by weight percent: 0.02-0.10 percent of C, 0.10-0.50 percent of Si, 0.60-1.00 percent of Mn, less than 0.015 percent of P, less than 0.010 percent of S, 0.01-0.10 percent of Ti, 0.10-0.50 percent of Cr, 0.01-0.10 percent of Al, 0.10-0.80 percent of Cu, 0.10-0.80 percent of Ni, and the balance being Fe and inevitable impurities. The submerged arc welding wire disclosed by the invention is used to weld the corrosion resistant boat deck of the cargo oil tank of the crude oil tanker, a welding seam satisfying the requirements for the welded joint of the cargo oil tank of the crude oil tanker can be obtained when the welding wire is matched with a basic flux. The tensile strength thereof is more than 440MPa, and the ballistic work of a welded joint metal is more than 100J at -20 degrees centigrade. The submerged arc welding wire not only is matched with the steel board strength of the cargo oil tank of the crude oil tanker, but also can adapt an un-painting operation condition, thus synchronizing the corrosion resistant property with a motherboard.

Description

technical field [0001] The invention relates to a submerged arc welding wire, in particular to a submerged arc welding wire suitable for welding cargo oil tanks of crude oil tankers, the tensile strength of which is greater than 440MPa, and the impact energy of the weld metal at -20°C is greater than 100J, which is comparable to the steel plate strength of crude oil tanker cargo oil tanks. Matching, but also can adapt to non-painting working conditions, corrosion resistance and mother board synchronization. Background technique [0002] In May 2010, the 87th meeting of the Maritime Safety Committee of the International Maritime Organization (IMO) passed the SOLAS amendment on "Corrosion Protection of Crude Oil Cargo Tanks", "Performance Standards for Protective Coatings of Crude Cargo Tanks" and "Crude Cargo Cargo Performance Standard for Alternative Corrosion Protection Measures for Oil Tanks". As a result, the "Performance Standard for Protective Coatings for Cargo Tanks ...

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Problems solved by technology

However, at present, the strength level of the ship plate used in the cargo oil tank of the crude oil tanker is relatively low, mainly AH32, and the strength requirement for the weld is relatively low. The large difference in composition and strength with the mother plate is not good for the synchronization of corrosion resistance.

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