High-strength alloy solid cored welding wire

Abstract

The invention relates to a high-strength alloy solid cored welding wire, which is characterized in that the welding wire comprises the following main chemical components in percentage by mass: 0.06 to 0.12 percent of C, 3.6 to 6.1 percent of Ni, 1.65 to 1.85 percent of Mn, 0.4 to 0.7 percent of Mo, 0.8 to 1.2 percent of Cr, 0.2 to 0.4 percent of Si, 0.03 to 0.06 percent of V, 0 to 0.05 percent ofRe, 0 to 0.015 percent of Ti, 0 to 0.015 percent of Al, 0 to 0.02 percent of Nb, and the balance of Fe. The welding wire adopts the design of Ni-Cr-Mo-Mn-V-Ti alloy, and is matched with other Si, Al,Re and Nb alloy elements, so that the comprehensive performance of steel grade such as obdurability, corrosion resistance, processability and the like are overall promoted. The welding wire has the advantages that: firstly, the welding wire has good processing technology performance, wire rod smelting and rolling and welding wire drawing processes thereof are easy to realize, and the welding wirehas lower cost; and secondly, the tensile strength sigma b of weld metal of the welding wire is more than or equal to 850MPa, the elongation delta 5 is more than or equal to 12 percent, and the impact work at the temperature of 50 DEG C below zero is more than or equal to 50J.

Description

technical field [0001] The invention relates to a high-strength alloy solid core welding wire, which belongs to the field of metallurgy. Background technique [0002] The new generation of steel materials is a new type of steel with ultra-fine grain, ultra-cleanness, high uniformity, and more reasonable cost performance. It has begun to be widely used in super-large ships, especially ships. This type of steel for ships requires not only high strength, but also strong toughness, good weldability, seawater corrosion resistance, and a large thickness span, so welding is very difficult. This requires the development of high-quality welding materials to match it and achieve the strengthening and toughness of the weld. [0003] However, the current high-strength welding wire has a weld tensile strength lower than 850MPa. For example: In 2000, Nippon Steel Corporation of Japan applied for "Gas-shielded welding wire for pipeline and gas-shielded welding method for pipeline circula...

AI Technical Summary

Problems solved by technology

[0003] However, the current high-strength welding wire has a weld tensile strength lower than 850MPa.

For example: In 2000, Nippon Steel Corporation of Japan applied for "Gas-shielded welding wire for pipeline and gas-shielded welding method for pipeline circular seam", patent application number JP2000218391A. The weld metal of the gas-shielded welding wire introduced has good low-temperature impact toughness, But the disadvantage is that the tensile strength cannot reach 700MPa stably; in 2002, Wuhan Iron and Steel Group applied for "high toughness gas shielded welding wire for low alloy high strength steel", patent application number 01133651.X The tensile strength of the weld after welding is 700~ 800MPa, suitable for gas-shielded arc welding of 700MPa-level low-alloy high-strength steel; Beijing Iron and Steel Research Institute applied for "ultra-low carbon high-strength gas-shielded welding wire material", patent application number 02158129.0, and the highest weld strength after welding can reach 840MPa