Ultrahigh-strength gas shielded welding wire and wire rod

Abstract

The invention relates to an ultrahigh-strength gas shielded welding wire and wire rod. The welding wire comprises the following chemical components, in percentage by mass, of 0.05%-0.15% of C, 0.65%-0.80% of Si, 1.7%-2.0% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 0.18%-0.28% of Cr, 1.4%-1.8% of Ni, 0.2%-0.6% of Mo, 0.10%-0.20% of Ti, 0.01%-0.05% of V, 0.007%-0.014% of N, and the balance Fe and inevitable impurities, and meanwhile, it is desirable to satisfy that Si/24+Mn/6+Ni/40+Cr/5+Mo/4=0.45%-0.55%, and Ti+6V+15N=0.3%-0.6%. According to the welding wire andthe wire rod, the yield strength of the weld metal of the welding wire is larger than or equal to 800 MPa, the tensile strength is larger than or equal to 900 MPa, the elongation A is larger than or equal to 18%, the impact energy Akv of -40 DEG C is larger than or equal to 50 J, and the welding performance and the crack resistance of the welding wire and the strong plasticity and toughness of theweld metal are both considered.

Description

technical field [0001] The invention belongs to the field of gas-shielded welding welding materials, and in particular relates to an ultra-high-strength gas-shielded welding wire and a wire rod. Background technique [0002] With the development of the manufacturing industry, high parameters, large-scale, and lightweight have become the development trend. Such as engineering machinery, mining machinery, hydropower industry, port equipment, marine structure, automobile and other fields all use high-strength steel products in large quantities. Welding is an indispensable link in the manufacturing industry, and the performance of its welded joints is related to whether the entire structure meets the design and manufacturing requirements. Welded joints not only need to pursue high strength, but also must ensure the requirements of plasticity, toughness and weldability. [0003] At present, in order to obtain high weld metal strength and ensure a certain toughness, gas shielded...

AI Technical Summary

Problems solved by technology

However, as the carbon equivalent and cold crack sensitivity index of the weld metal increase and the weldability decreases, more stringent process assistance is bound to be required during the welding process to ensure that no defects occur

At the same time, the addition of these elements also increases the manufacturing cost of welding materials

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