Low-carbon sulfur-containing round steel for air-conditioning pipes and production technology of round steel
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A production process and round steel technology, applied in the field of low-carbon sulfur-containing round steel for air-conditioning pipes and its production technology, can solve the problems of few technical solutions for low-carbon sulfur-containing round steel, and achieve significant economic and social benefits. High finish and long service life
Active Publication Date: 2019-07-09
ZENITH STEEL GROUP CORP +1
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[0005] With the rapid development of my country's machinery manufacturing industry and the improvement of automation in the processing process in recent years, the cutting performance requirements
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Embodiment 1
[0047] (1) The steel-making raw material that converter adopts is scrap steel and molten iron, and scrap steel accounts for 14% of described steel-making raw material gross weight, and molten iron accounts for 86% of described steel-making raw material gross weight, and total charging capacity is 142t / furnace;
[0048] (2) During the converter smelting process, the whole process of bottom blowing argon stirring is adopted, smelting for 15 minutes, tapping [C] 0.08%, tapping [P] 0.018%, tapping temperature 1635°C, tapping 1 / 4 of the time according to the order of steel flow Add aluminum block 0.5kg / t, silicon carbide 0.8kg / t, silicon manganese 6.9kg / t, ferrosilicon 0.6kg / t, low carbon ferromanganese 7.0kg / t, low carbon ferrochrome 5.8kg / t, copper 1.3 kg / t, iron sulfur 3.2kg / t; lime 400kg, slag blocking operation is adopted during the tapping process, slag dropping is strictly prohibited, and the tapping time is 4.1min;
[0054] Tapping [C] of step (2): 0.09%, tapping [P] 0.020%,
[0055] Step (3) The temperature of the ladle after soft blowing is 1580°C for continuous pouring.
[0056] Step (4) superheat degree 30 ℃,
[0057] All the other operations are the same as in Example 1.
Embodiment 3
[0059] Compared with embodiment 1, wherein
[0060] Step (5) The rolling start temperature is 1148° C., the KOCKS rolling mill temperature is 903° C., the upper cooling bed temperature is 707° C., and other operations are the same as in Example 2.
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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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