Preparation method of magnesium-based high-sulfur free-cutting steel
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A free-cutting steel and high-sulfur technology, applied in the field of iron and steel metallurgy, can solve the problems of inability to meet the production needs of high-precision products and application restrictions
Pending Publication Date: 2020-12-11
SHANGHAI UNIV
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Problems solved by technology
With the rapid development of automation, high-speed and precision cutting, traditional free-cutting steel can no longer meet the production needs of high-precision
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Embodiment 1
[0070] In this embodiment, a method for preparing a magnesium-based high-sulfur free-cutting steel, calculated by mass percentage, is a low-carbon magnesium-containing high-sulfur free-cutting steel based on 1215 free-cutting steel, and its composition is: C:0.05 ~0.09%, Si≤0.15%, Mn:1.0~1.3%, P≤0.08%, S:0.25~0.35%, Mg:0.0003~0.0015%, O≤0.0030%, the balance is iron and unavoidable trace elements ; Its production process is converter → LF → continuous casting → rolling, and the specific operation of each process is as follows:
[0071] (1) Converter smelting:
[0072] Add molten iron and scrap steel to the converter for oxygen blowing smelting, melt the scrap steel, and remove excessive carbon in the steel. When the carbon and temperature are qualified, the steel is tapped. The tapping process adopts aluminum-iron deoxidation alloying; aluminum-iron, sulfur-iron and other alloys And slag material is added when the tapping amount reaches 1 / 4, and all the addition is completed b...
Embodiment 2
[0086] This embodiment is basically the same as Embodiment 1, especially in that:
[0087] In this example,
[0088] In this example, see figure 1 , a method for preparing a magnesium-based high-sulfur free-cutting steel. Calculated by mass percentage, the medium-carbon magnesium-containing high-sulfur free-cutting steel based on 1144 has the following components: C: 0.40-0.48%, Si: 0.25- 0.45%, Mn:1.4~1.7%, P≤0.08%, S:0.25~0.35%, Mg:0.0003~0.0015%, O≤0.0020%, the rest is iron and unavoidable trace elements; its production process is electric furnace →LF→VD→Continuous casting→Rolling, the specific operation of each process is as follows:
[0089] (1) Electric furnace smelting:
[0090] Add steel scrap and molten iron to the electric furnace, energize and blow oxygen, and tap the steel after the composition and temperature of the electric furnace reach the standard. Argon; slag blocking operation during the tapping process. After tapping the steel, blow the argon at the arg...
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Abstract
The invention discloses a preparation method of magnesium-based high-sulfur free-cutting steel. The magnesium-based high-sulfur free-cutting steel comprises the following chemical components in percentage by mass: 0.05-0.50% of C, less than or equal to 0.40% of Si, 1.0-1.7% of Mn, less than or equal to 0.08% of P, 0.15-0.35% of S, 0.0003-0.0020% of Mg, less than 0.0030% of O and the balance of iron and inevitable impurities. A production process comprises the steps of converter or electric furnace smelting, LF refining, continuous casting and rolling, magnesium-containing cored wires are addedat the final stage of refining, the degree of superheat is controlled before wire feeding, the total oxygen content is not higher than 30 ppm, and an intermittent feeding method is adopted. The wirefeeding process is stable, violent splashing is avoided, and the yield of the magnesium element is higher. The product prepared by the preparation method has excellent cutting performance and remarkably improved cutting breaking performance and the abrasion resistance of cutters. The cost of each ton of steel is increased by not more than 10 yuan, and the price advantage is obvious.
Description
technical field [0001] The invention relates to a free-cutting steel and a preparation method thereof, in particular to a high-sulfur free-cutting steel and a preparation method thereof, which are applied in the technical field of iron and steel metallurgy. Background technique [0002] Free-cutting steel refers to the alloy steel that adds a certain amount of one or more than one kind of easy-cutting elements such as sulfur, phosphorus, lead, calcium, selenium and tellurium to the steel to improve its machinability. As the cutting process in the machinery manufacturing industry moves towards precision, high speed and automated mass production, the proportion of processing cost to the production cost of parts is getting higher and higher. In order to reduce processing costs and improve production efficiency, free-cutting steel has received more and more attention. [0003] Free-cutting steels can be divided into sulfur-based, lead-based, calcium-based, tin-based, tellurium-...
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