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Low S low Pb forgeable free cutting steel and its producing process

A free-cutting steel and production process technology, applied in metal rolling and other directions, can solve the problems of low rolling yield, difficult smelting, poor forgeability, etc., and achieve high rolling yield and good forgeability. , the effect of improving the production environment

Active Publication Date: 2010-09-01
HANGZHOU IRON & STEEL GRP
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Problems solved by technology

[0002] Free-cutting steel is an increasingly widely used energy-saving material in the machinery industry. At present, free-cutting steels at home and abroad are usually mainly sulfur-based, sulfur-phosphorus-based and lead-based. There are many technical and economic bottlenecks in the actual production and use process, such as smelting High difficulty, low rolling yield, poor forgeability, etc.
At the same time, the large use of sulfur and lead in the production process has brought serious pollution to the environment. Therefore, the development of a low-S and low-Pb forgeable free-cutting steel and its production process has become an urgent problem to be solved.

Method used

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Embodiment Construction

[0006] The low-S and low-Pb malleable free-cutting steel described in the invention contains chemical components by weight (wt%): C: 0.36-0.44, Si: 0.17-0.37, Mn: 0.80-1.20, As: 0.20-0.30, Sn +Pb: 0.05-0.20, P: ≤0.040, S: ≥0.060, Cu: ≤0.25, and the rest are Fe and impurities; the production process steps are: converter smelting→ladle refining→continuous casting→rolling; the specific steps are as follows:

[0007] Converter smelting: During converter smelting, hot-charged molten iron is added, and the molten iron accounts for 85% of the total input into the furnace, and a certain amount of As-containing pig iron and other scrap iron and steel materials are added for smelting. The smelting temperature is 1640-1660°C to meet the chemical composition required molten steel;

[0008] Add pre-measured high-sulfur pig iron, lead shot, ferromanganese alloy, ferrosilicon alloy and other alloying alloys during the tapping process of the converter, and add deoxidized alloys Al-Mn-Fe, Al-C...

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Abstract

The present invention belongs to the field of metal material, and is especially one kind of forgeable free cutting steel with low S and Pb content and its production process. The forgeable free cutting steel contains (in wt%): C 0.36-0.44, Si 0.17-0.37, Mn 0.80-1.20, As 0.20-0.30, Sn+Pb 0.05-0.20, P not more than 0.040, S not more than 0.060, Cu not more than 0.25 and Fe and impurity for the rest. The production process includes the steps of: smelting in a converter, ladle refining, continuous casting and continuous rolling. The present invention has low production cost, less environmental pollution, high production efficiency and high product quality.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a low-S and low-Pb forgeable free-cutting steel and a production process thereof. Background technique [0002] Free-cutting steel is an increasingly widely used energy-saving material in the machinery industry. At present, free-cutting steels at home and abroad are usually mainly sulfur-based, sulfur-phosphorus-based and lead-based. There are many technical and economic bottlenecks in the actual production and use process, such as smelting Difficulty, low rolling yield, poor forgeability, etc. At the same time, the massive use of sulfur and lead in the production process has brought serious pollution to the environment. Therefore, the development of a low-S and low-Pb malleable free-cutting steel and its production process has become an urgent problem to be solved. Contents of the invention [0003] The purpose of the present invention is to provide a low-S low-Pb f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/16C22C33/04B21B1/46C21C7/06C21C7/072B22D11/18B22D11/115
Inventor 叶健松王跃华袁永唐海军
Owner HANGZHOU IRON & STEEL GRP
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