Ultrahigh-strength gas protection welding wire containing V and manufacturing method thereof

Abstract

The invention discloses an ultrahigh-strength gas protection welding wire containing V. The ultrahigh-strength gas protection welding wire comprises the following chemical elements in percentage by mass: 0.08 to 0.12 percent of C, 0.65 to 0.80 percent of Si, 1.80 to 1.95 percent of Mn, at most 0.25 percent of Cu, 0.20 to 0.40 percent of Cr, 0.2 to 0.6 percent of Mo, 1.30 to 1.80 percent of Ni, 0.08 to 0.20 percent of Ti, 0.01 to 0.05 percent of V, 0.0070 to 0.0130 percent of N and the balance of Fe and other inevitable impurities. The invention also discloses a manufacturing method of the welding wire. Weld metal obtained after the welding by the welding wire provided by the invention has higher strength and toughness, and also has good anti-cracking performance, welding performance and plasticity.

Description

technical field [0001] The invention relates to a welding material and a manufacturing method thereof, in particular to a gas shielded welding material and a manufacturing method thereof. Background technique [0002] With the development requirements of high parameters, large size and light weight of modern mechanical equipment, the use of steel with a strength level of 90kg and above has also become the first choice for the design and manufacture of many domestic industries, for example, in the field of construction machinery manufacturing cranes, Concrete pump trucks, another example, coal machine hydraulic supports in the field of mining machinery manufacturing, and another example, hydraulic pressure steel pipes in the field of hydropower industry. In addition, related manufacturing fields such as port machinery, marine structures, passenger and freight vehicles, and special vehicles all require a large amount of high-strength steel. At the same time, since gas-shielde...

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Problems solved by technology

Generally, with the increase of tensile strength, the low-temperature impact toughness of ultra-high-strength welding materials will be greatly reduced. In order to make ultra-high-strength welding materials also have good toughness properties, more than 2wt.% Ni is often added in the prior art. However, the addition of Ni element will greatly increase the cost of welding materials

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