Method for manufacturing steel wire rod for pipe line steel submerged arc welding wire

Abstract

The invention relates to a method for manufacturing a steel wire rod for a pipe line steel submerged arc welding wire, which belongs to the technical field of pipe line steel. The method comprises the following steps: adopting a small square billet continuous casting and controlled rolling and controlled cooling process to produce the steel wire rod for an X60-X70 pipe line steel submerged arc welding wire, and adopting Mo, Ti and B for microalloying; performing dual-slag operation in a converter, and performing skimming tapping at a tapping temperature of between 1,670 and 1,690 DEG C; adopting Si-Al-Ba for deoxidation; adding 200 to 300 kilograms of synthetic slag in each furnace; controlling the oxygen activity to be less than or equal to 10 ppm; performing inclusion denaturation treatment on a Ca-Si line; performing constant pulling rate full protection casting in a reasonable secondary cooling system; and adopting a temperature control rolling technique and a slow-cooling technique to ensure the moderate strength of the steel wire rod. The method has the advantages that the internal and surface quality of the steel wire rod can be controlled stably, an economic technical route for producing the steel wire rod for the pipe line steel submerged arc welding wire by using 130 mm<2> continuous casting small square billets is opened up successfully, the quality of the steel wire rod product is good, and the yield accounts for 1 / 2 of the total domestic demand.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel, and in particular provides a production method of steel H08SG wire rod for submerged arc welding wire of pipeline steel, which is suitable for the production of H08SG steel wire rod for submerged arc welding wire of X60-X70 pipeline steel (hereinafter referred to as H08SG) . Background technique [0002] H08SG steel requires uniform chemical composition, pure steel, uniform wire rod structure, moderate strength, high surface shrinkage and other quality characteristics, and has strict requirements on the control of each production process. The traditional process of producing steel wire rod for pipeline steel submerged arc welding wire at home and abroad is: converter or electric furnace smelting → pouring die-casting steel ingot or 200mm 2 Bloom casting machine casting billet → high-speed wire rod rolling mill rolling → controlled cooling to make the wire rod obtain ferrite and pearlite s...

AI Technical Summary

Problems solved by technology

Using die-casting to produce steel plates for pipeline steel submerged arc welding wires requires many procedures, high labor intensity, low yield and high production costs; while using 130mm 2 Although the cost of producing this type of steel by continuous casting billet is low, the quality of molten steel and the internal quality of continuous casting billet are not easy to control, so it is considered impossible to produce

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