Gas shield welding wire for oil cargo tank of oil tanker

Abstract

The invention discloses a gas shield welding wire for an oil cargo tank of an oil tanker, which comprises the following components in percent by mass: 0.01-0.15 percent of C, 0.1-1 percent of Si, 1-2 percent of Mn, not more than 0.015 percent of P, not more than 0.012 percent of S, 0.1-1 percent of Ni, 0.1-1 percent of Cu, more than 0 and not more than 0.1 percent of Cr, 0.01-0.25 percent of Ti, more than 0 and not more than 0.1 percent of Al and the balance of iron and other unavoidable impurities. The gas shield welding wire for the oil cargo tank of the oil tanker has excellent uniform corrosion resistance and corrosive pitting resistance even in a crude oil corroding environment; and a weld joint has better mechanical property.

Description

technical field [0001] The invention relates to a gas-shielded welding wire used in the cargo oil tank of an oil tanker. The weld seam obtained after welding with the gas-shielded welding wire does not need anti-corrosion treatment, and has excellent uniform corrosion resistance and spot resistance even in the corrosive environment of crude oil. Corrosion properties, while the weld also has good mechanical properties. Background technique [0002] When the cargo oil tank of an oil tanker is filled with crude oil, the cargo oil tank is in an extremely complex and harsh corrosive environment. On the one hand, uniform corrosion occurred on the upper deck in the cargo oil tank. During the transportation of crude oil, the cargo oil tank is filled with explosion-proof gas (5% O 2 +13%CO 2 +0.01%SO 2 +0.1%H 2 S+bal N 2 ), under the alternation of day and night, the temperature and humidity in the cargo oil tank of the tanker change, and water droplets will condense on the upp...

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Problems solved by technology

However, the corrosion resistance of the gas shielded welding wire of the existing technology is quite different from that of the newly developed corrosion-resistant steel, which cannot meet the requirements of corrosion resistance without anti-corrosion treatment.

The low-alloy steel corrosion-resistant gas-shielded welding wire used in other fields is mainly resistant to atmospheric corrosion, such as Chinese patents CN101357425, CN1301825, CN1290661, CN101062534, which are very different from the corrosion environment of oil tanker cargo tanks, so these welding wires are not suitable for tanker cargo oil cabin welding

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