Production method of heat-resistant steel welding wire

Abstract

The invention discloses a production method of heat-resistant steel welding wires. The method sequentially comprises the following steps of 1) performing steel ingot smelting according to designated chemical components to obtain a steel ingot; 2) testing the continuous cooling transformation curve of the welding wire steel by adopting a Gleeble thermal simulation test and deducing process parameters for rolling and cooling control; 3) rolling the steel ingot into coil rods with diameter of 5.5-8.0mm by referring to a process; 4) performing rough drawing to the coil rods after acid washing; 5) performing primary annealing treatment, the process of which is heating to 830-850 DEG C, preserving heat for 2 hours and then slowly cooling; 6) performing fine drawing after acid washing to obtain welding wires with diameter of 0.8-4.0mm. The drawing performance of the coil rods produced by adopting the production method disclosed by the invention is good, one time of annealing is only required in the process of drawing the coil rods into the welding wire finished products, the production efficiency is improved, the produced welding wires can be used for chrome-molybdenum heat-resistant steel welding, the electric arc is stable during welding, the spatter is less, the slag is easy to remove, and welded joints have excellent impact toughness, temper embrittlement resistance, high-temperature strength and creep resistance.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a production method of heat-resistant steel welding wire. Background technique [0002] Heat-resistant steel can maintain chemical and mechanical stability at high temperatures, and is used in power plant power plants, petroleum refining equipment, hydrocracking units, synthetic chemical containers and other industrial sectors. The wide application of heat-resistant steel makes the market demand for matching welding consumables larger. [0003] The chromium-molybdenum steel welding wire ER55-B2 in the national standard is a kind of welding consumable commonly used in heat-resistant steel welding. The performance control is not perfect, resulting in generally high tensile strength of wire rod (800-1000MPa), poor plasticity (14-18% elongation), and poor drawing performance. In the drawing process, the broken wire rate is high and the production efficiency is low. Generally, the w...

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Problems solved by technology

[0003] The chromium-molybdenum steel welding wire ER55-B2 in the national standard is a kind of welding consumable commonly used in heat-resistant steel welding. The performance control is not perfect, resulting in generally high tensile strength of wire rod (800-1000MPa), poor plasticity (14-18% elongation), and poor drawing performance. In the drawing process, the broken wire rate is high and the production efficiency is low. Generally, the wire rod needs to be annealed at a temperature of 650-850°C for 4-8 hours before drawing, and intermediate annealing is also required during the drawing process. After annealing, pickling is required. Multiple annealing and pickling not only increase the production process and processing cost, but also consume a lot of energy and pollute the environment.

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