Boron contained alloy steel welding wires and production process thereof

Abstract

The invention relates to boron contained alloy steel welding wires and a production process thereof and belongs to the technical field of welding materials. According to the technical scheme, the boron contained alloy steel welding wires are formed by boron contained alloy steel coil rods through machining; boron is added when alloy steel is smelted, block-shaped boron is added in the process of molten steel refining, and refining composition is uniformly dissolved in molten steel to form the boron contained alloy steel coil rods; chemical composition of every component comprises, by mass, 0.06 to 0.10% of carbon, 0.80 to 1.00% of silicon, 1.40 to 1.60% of manganese, 0.025% or less of phosphorus, 0.025% or less of sulfur, 0.15% or less of nickel, 0.15% or less of chromium, 0.15% or less of cuprum and 0.0010 to 0.0030% of boron. Compared with silicon manganese steel welding wires, the fluidity of the molten iron is good in the welding process and welding seams are attractive in appearance; the corrosion resistance is excellent; the hardness and the tensile strength of welding seam deposited metal are improved; the welding strength level is improved.

Description

technical field [0001] The invention relates to a boron-containing alloy steel welding wire and a production process thereof, belonging to the technical field of welding materials. Background technique [0002] Background Art Wire rods for welding wire (drawing) usually use low-carbon boiling steel wire rods as raw materials, mainly because of their low yield and tensile strength, soft steel, and good drawing performance, as well as low-carbon killed wire rods produced by continuous casting. The drawing wire of steel wire rod has worse performance than that of low-carbon boiling steel. The heat generated by the deformation of the steel wire during the drawing process and the heat generated by the friction between the wire drawing die holes will increase the temperature of the steel wire and cause strain aging. As a result, the torsional performance of the steel wire deteriorates sharply, the bending properties deteriorate, and the number of fractures increases; the yield str...

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Problems solved by technology

[0002] Background Art Wire rods for welding wire (drawing) usually use low-carbon boiling steel wire rods as raw materials, mainly because of their low yield and tensile strength, soft steel, and good drawing performance, as well as low-carbon killed wire rods produced by continuous casting. The drawing wire of steel wire rod has worse performance than that of low-carbon boiling steel. The heat generated by the deformation of the steel wire during the drawing process and the heat generated by the friction between the wire drawing die holes will increase the temperature of the steel wire and cause strain aging. As a result, the torsional performance of the steel wire deteriorates sharply, the bending properties deteriorate, and the number of fractures increases; the yield strength of ordinary low-carbon steel wire is generally below 500Mpa, while industrial pipes use boron-containing steel pipes, and the yield strength of the welded pipes is required to reach 500- 550Mpa, or even higher, therefore, the low-carbon steel welding consumables in the background technology can no longer meet the welding requirements of this high-strength steel