Gas shielded welding wire with 900MPa tensile strength

Abstract

The invention relates to a gas shielded welding wire with 900MPa tensile strength, which comprises the following components in percents by weight: 0.06-0.10% of C, 0.40-0.60% of Si, 1.60-1.90% of Mn, not more than 0.020% of P, not more than 0.020% of S, 2.40-3.00% of Ni, 0.40-0.69% of Cr, 0.40-0.80% of Mo, 0.20-0.40% of Cu, 0.05-0.15% of Ti, not more than 0.005% of N, not more than 0.015% of Al and the balance of Fe and unavoidable impurities. The carbon equivalent CE of the welding wire is 0.70-0.85, and CE = C + Mn / 6 + (Ni+Cu) / 15 + (Cr+Mo+V) / 5. The invention provides a super-high strength gas shielded welding wire. The strength of welding joints is higher than 900MPa, and the toughness of the welding joints is higher than 227J at -20 DEG C KV. The textures of all parts of multiple layers of welding joints are uniform. The impact fractures are mainly dimple fractures. In the invention, the matched welding material for the application of super-high strength steel in China is provided.

Description

technical field [0001] The invention relates to a solid core welding wire for gas shielded welding, which specifically belongs to a welding wire alloyed with elements such as Ni, Cr, Mo and Cu. 2 +80% Ar) gas as shielding gas, the weld strength is higher than 900MPa, the impact toughness is excellent, the heat-affected zone structure on the weld and the weld is martensite plus bainite, and the structure of each part of the multi-layer weld is comparatively Uniform tensile strength 900MPa grade gas shielded welding wire. Background technique [0002] With the gradual development of steel structures towards lightweight, the strength of steel materials is increasing day by day, and the application proportion of steel varieties with a tensile strength of 900MPa is constantly expanding. At present, most steel types with tensile strength above 900MPa are produced by quenching and tempering process, and some steel types are produced by advanced processes such as TMCP, DIFT and SID...

AI Technical Summary

Problems solved by technology

The addition of V and Al can easily cause embrittlement of the coarse-grained zone in the heat-affected zone on the weld

[0005] In addition, the composition range of the above two patents is very wide. When the elements of the actual composition are close to the upper limit or the lower limit at the same time, the corresponding weld strength of the welding wire will be very different, and the metallographic structure of the welding wire will also be very unstable.

At the same time, it will increase the large fluctuation of the wire drawing process

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