Steel for composite microalloyed welding wire and preparation method thereof

Abstract

The invention provides steel for a composite microalloying welding wire and a preparation method thereof. The steel is characterized by comprising the following chemical components in percentage by weight: no less than 0.06% and no more than 0.15% of C, no less than 0.81% and no more than 1.15% of Si, no less than 1.40% and no more than 1.85% of Mn, no less than 0.08% and no more than 0.15% of Ni, no less than 0.05% and no more than 0.15% of Cr, no less than 0.05% and no more than 0.15% of Mo, no less than 0.008% and no more than 0.012% of Ti, no less than 0.006% and no more than 0.030% of V, no less than 0.015% and no more than 0.025% of Nb, no less than 0.0005% and no more than 0.0030% of B, no more than 0.025% of S, no more than 0.025% of P, no more than 0.005% of O and the balance of Fe. The preparation method comprises the following steps of converting, ladle bottom argon blowing, LF refinement, fully-protected continuous casting, hot rolling and STELMOR cooling. The composite alloying provided by the invention is beneficial to refine molten drops, stabilize current and enhance the weld quality, and is beneficial to enhance the weld strength.

Description

technical field

[0001] The invention belongs to the field of iron and steel materials, and in particular relates to a steel for welding wire which adopts composite alloying of multiple alloy elements. Background technique

[0002] High-titanium alloy welding wire is the main material for gas shielded welding at present. This type of steel generally requires the control range of Ti to be 0.10%-

[0003] Within 0.25%, there are two main problems in this type of steel at present: one is that titanium is easily oxidized during continuous casting of high-titanium alloy wire steel, and TiO 2 1. TiN particles enter the mold slag and cause the performance of the mold slag to deteriorate, resulting in quality problems of continuous casting slabs; 2 Oxidation also exists in the atmosphere. If the amount of alloy is insufficient and the deoxidation is insufficient, pores will be generated in the weld, especially the unevenness of the molten droplets will lead to large fluctuations in ...