Gas shield welding wire with high strength and tenacity

Abstract

The invention relates to a gas shield welding wire with high strength and tenacity, which is suitable for the welding of 800MPa-grade high-strength steel. The gas shield welding wire comprises the following ingredients in percentage by weight: 0.02-0.05 percent of C, 0.30-0.80 percent of SiO, 2.0-2.50 percent of Mn, less than 0.010 percent of P, less than 0.010 percent of S, 0.70-1.2 percent of Cr, 0.70-1.2 percent of Mo, 0.02-0.12 percent of Ti, 0.003-0.005 percent of B, 2.0-3.2 percent of Ni, 0.05-0.1 percent of RE, 0-0.06 percent of Nb, and the balance of Fe and unavoidable impurities. The welding wire has the advantages of simple ingredient design, low cost, good manufacturability, and the like; in addition, and weld metal has high tenacity and is suitable for the welding at the position with higher low-temperature tenacity requirement. Experiments show that the Rm of the weld metal welded by the welding wire is not less than 800MPa, and the ReL is more than 760MPa; and the impact energy at -50 DEG C of the weld metal is not less than 37J.

Description

technical field [0001] The invention relates to a high-strength and high-toughness gas-shielded welding wire, which belongs to the field of matching welding materials for high-strength steel, and is particularly suitable for gas-shielded welding of 800MPa high-strength steel. Background technique [0002] With the rapid development of my country's industry, the strength level of steel materials is gradually developing in the direction of high strength and high toughness. Construction machinery, hydropower and water conservancy, petrochemical and other industries have begun to use a large number of steel grades with a strength level of 800Mpa. However, the research and development of welding materials for this ultra-high-strength steel in China is still lagging behind, and the existing welding wires are less than equal. Even if a small amount of successfully developed welding wire is not costly and requires heat treatment after welding, the low-temperature impact toughness an...

AI Technical Summary

Problems solved by technology

Construction machinery, hydropower and water conservancy, petrochemical and other industries have begun to use a large number of steel grades with a strength level of 800Mpa. However, the research and development of welding materials for this ultra-high-strength steel in China is still lagging behind, and the existing welding wires are less than equal. Even if a small amount of successfully developed welding wire is not costly and requires heat treatment after welding, the low-temperature impact toughness and manufacturability of the weld metal cannot meet the requirements. In addition, the content of Mo and Ni in the currently developed welding wire is very high. Moreover, preheating is required during the welding process, which greatly increases the cost and welding difficulty of the welding wire. Therefore, it is very urgent to develop a gas-shielded welding wire with high strength, high toughness and good manufacturability.