Low-carbon sulfur-containing round steel for air-conditioning pipes and production technology of round steel

Abstract

The invention discloses low-carbon sulfur-containing round steel for air-conditioning pipes and a production technology of the round steel. The round steel is prepared from components including, by weight, 0.12%-0.20% of C, 0.05%-0.20% of Si, 0.60%-1.10% of Mn, 0.30%-0.50% of Cr, 0.10%-0.40% of Cu, less than or equal to 0.040% of P, 0.08%-0.20% of S, less than or equal to 0.010% of [Al] and the balance Fe and inevitable impurities. A preparation method includes the steps of smelting in a converter, LF refining, continuous casting of blooms and rolling. Through reasonable component design and technical parameter control, the produced low-carbon sulfur-containing round steel for the air-conditioning pipes is good in mechanical property and machinability, stable in sulfur absorptivity, good in pourability, calcium treatment is avoided, 8-15 furnaces can be cast continuously, and the technical problems that low-carbon sulfur-containing round steel are prone to nodulation and steel leakageduring casting, unstable in yield of sulfur and the like are solved.

Description

technical field

[0001] The invention belongs to the field of metal material production, in particular to a low-carbon and sulfur-containing round steel for air-conditioning pipes and a production process thereof. Background technique

[0002] Free-cutting steel refers to adding a certain amount of free-cutting elements to steel, such as sulfur (S), phosphorus (P), lead (Pb), bismuth (Bi), tellurium (Te), etc., to improve the cutting performance of steel, It achieves the purpose of reducing cutting resistance, improving cutting quality, improving the surface roughness of chips, and improving the life of the tool and production efficiency. Therefore, free-cutting steel is mainly used to make cutting products, such as shafts of copiers and printers, cold-pressed products, electronics, precision parts, and special-shaped products in the aviation industry. Sulfur-containing free-cutting steel is the most common type of free-cutting steel, accounting for about 70% and 90% of the ...

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