Seamless submerged arc flux-cored wire for welding high manganese steel LNG storage tank

Abstract

The invention discloses a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank. The seamless submerged arc flux-cored wire is composed of outer skin and flux-cored powder. The flux-cored powder accounts for 30-40wt% of the total weight of the wire. The flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1.5 parts of silicon iron, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite. The flux-cored wire is good in manufacturability, excellent in toughness at 196 DEG C below zero, low in cost and suitable for welding the high manganese steel LNG storage tank.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a seamless submerged arc flux-cored welding wire for welding high manganese steel LNG storage tanks. Background technique [0002] With the shortage of oil resources in my country and the strengthening of national environmental protection, natural gas (LNG) has been paid more and more attention as a clean energy source, so the demand for transportation and storage of natural gas has increased. At present, the materials that can be used for LNG storage tanks mainly include 9Ni steel, aluminum alloy, austenitic stainless steel and high manganese steel. Among them, 9Ni steel is the most widely used, but the construction cost is also the highest. High manganese steel is the material with the lowest construction cost for LNG storage tanks, but the research on matching welding consumables for high manganese steel LNG storage tanks is relatively backward. [0003] The patents...

AI Technical Summary

Problems solved by technology

However, the above patents all contain 5% to 10% Ni, which will not only increase the cost of welding wire, but also the cladding metal composition is inconsistent with the base metal composition, and the welding heat-affected zone is prone to composition segregation, and hot cracks are prone to occur after welding

Not only that, the solid welding wire used for welding high manganese steel has obvious wor