Cr-Mo-Al series welding rod for low-alloy and high-strength steel

Abstract

The invention discloses a Cr-Mo-Al series welding rod for low-alloy and high-strength steel, comprising a core wire and a coating, wherein the coating comprises the following components in percentage by weight: 32-42 percent of calcium oxide, 16-20 percent of calcium fluoride, 5-10 percent of titanium white, 8-12 percent of silicon dioxide, 3-5 percent of mid-carbon ferromanganese, 3-5 percent of ferromolybdenum, 4-6 percent of low-carbon ferromanganese, 3-4 percent of potassium oxide, 4-6 percent of sodium oxide, 2-3 percent ofaluminum oxide and 3-5 percent of copper. The welding rod provided by the invention has low manufacture cost, and the deposited metal of the welding rod has favorable mechanical property, welding performance and seawater corrosion resistance.

Description

A kind of Cr-Mo-Al series low-alloy high-strength steel welding rod technical field The invention belongs to the technical field of welding materials, in particular, the invention relates to a Cr-Mo-Al series low-alloy high-strength steel welding rod. Background technique At present, with the in-depth development and utilization of marine resources by humans, the steel structure parts required in marine engineering are also increasing day by day, such as: seawater pipelines, seawater heat exchangers, evaporators for salt making equipment, seabed containers and ship water Lower steel structure, etc. Because the marine environment is a complex corrosive environment, seawater itself is a strong corrosive medium, and waves, tides, and currents have low-frequency reciprocating stress impacts on steel components. This requires a class of seawater corrosion-resistant steel that can be applied to the above-mentioned environment. 10CrMoAl is one of them. It belongs to the Cr-Mo-A1...

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Problems solved by technology

After searching the documents of the prior art, it is found that the CN101148008A patent is an electric welding electrode used in a corrosion-resistant and wear-resistant environment. Precious metal components, such as nickel powder, rare earth, ferroniobium and copper, make the price expensive; CN101288924A patent is specially used for wire rod and welding wire of Q345C-NHY3 seawater corrosion-resistant steel, and is mainly used in submerged arc welding, not suitable for Manual repair welding or welding at special positions narrows its application range; CN1939649A patent is a welding material specially used for underwater wet welding, but it contains few corrosion-resistant alloy elements, and its deposited metal is in the marine environment. Not good for long-term use

Through the above search, it is found that there is no economical welding electrode with good mechanical properties and seawater corrosion resistance.

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