Ultra-low-carbon rare earth stainless steel welding wire and preparation method thereof

Abstract

The invention discloses an ultra-low-carbon rare earth stainless steel welding wire and a preparation method thereof. The method comprises the following steps: burdening according to the designed welding wire component; smelting by utilizing a vacuum electric furnace; carrying out desulfuration, dephosphorization and detrimental impurity removing process on the molten steel, wherein C is less than 0.5% and the steel tapping temperature T is more than or equal to 1650 DEG C; carrying out external refining by utilizing AOD, purifying the molten steel, decarbonizing by utilizing a vacuum oxygen blowing technique, wherein, the C is less than 0.01%, and carrying out tundish casting; further refining on the molten steel in the tundish by adopting a horizontal continuous technique, wherein, the casting blank crystallizer temperature is 1300-1320 DEG C; tandem rolling, cooling the horizontal continuous casting billet, and carrying out secondary rolling at the temperature of 950 DEG C; continuously pulling out, carrying out annealing treatment in protective atmosphere at 930-1000DEG C to obtain the finished product welding wire. The ultra-low-carbon content of the invention leads the intergranular corrosion resistance of the deposited metal to be improved, cold cracking tends to be weakened; the alloying elements, such as nickel and rare earth and the like lead the deposited metal to simultaneously have high tensile strength and good toughness, to be obviously superior to the performance of the similar standard welding material.

Description

technical field [0001] The invention belongs to high-tech fields such as aerospace equipment manufacturing, high-speed trains, and pressure vessels, and has high strength, high toughness, and anti-intergranular corrosion austenitic stainless steel welding wire and its manufacturing technology, especially an ultra-low carbon rare earth stainless steel welding wire and its method of manufacture. Background technique [0002] Austenitic stainless steel is non-magnetic and has high toughness and plasticity, so it can be used in a wide range of fields. In the welding process of austenitic stainless steel, the main problems are the intergranular corrosion of welded joints, stress corrosion cracks, hot cracks of welded joints and the matching of mechanical properties of welded joints. Intergranular corrosion is a very dangerous form of damage to austenitic stainless steel welded joints. It mainly occurs in three parts of the weld, namely, intergranular corrosion in the weld, inter...

AI Technical Summary

Problems solved by technology

Due to the horizontal continuous casting of molten steel with high alloy content, the slab is prone to defects such as component segregation, loose structure, and cracks

Under the premise of ensuring product quality, it is difficult to achieve the current technical level to manufacture ultra-low carbon and high alloy content austenitic stainless steel welding wire with short process and horizontal continuous casting, rolling and drawing.

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