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Homogeneous free machining steel and production process thereof

A free-cutting steel and production method technology, applied in the field of iron and steel smelting, can solve the problems of reduced machinability, uneven distribution of inclusions, low chip breaking rate, etc., to reduce oxide inclusions, improve hot workability, and reduce solidification segregation. Effect

Inactive Publication Date: 2008-11-19
LIAONING KAIRUI SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The free-cutting elements include S and Pb, etc., but the free-cutting steel containing Pb has great limitations, so the control of the S component will determine the cutting performance of the product. When the cutting speed reaches 600-700 rpm, the cutting performance will decrease significantly. , there will be problems such as sticking to the tool, large tool wear, and low chip breaking rate
Many high-S free-cutting steels on the market contain a large number of FeS inclusions, and the distribution of inclusions is uneven, and its machinability and hot workability are not ideal.

Method used

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  • Homogeneous free machining steel and production process thereof
  • Homogeneous free machining steel and production process thereof
  • Homogeneous free machining steel and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Melt scrap steel in an electric furnace, blow oxygen to remove carbon and dephosphorize, make the oxygen content reach 500-1000PPm, and control the tapping temperature at 1630-1650°C;

[0030] 2. Transfer the molten steel from the previous step to the refining ladle for microalloying. According to the requirements for S content in the product, add FeS first, and then add Fe-Mn according to the S content in the molten steel at a Mn / S ratio of 3.49 ;

[0031] 3. Stir with argon for reduction, further make the elements in the steel more uniform, and make the inclusion of sulfide more uniform;

[0032] 4. Use firebricks to make slag, and firebricks contain Al 2 o 3 About 40%, SiO 2 About 60%, S in stable steel does not fluctuate;

[0033] 5. Use calcium carbide to deoxidize instead of Al and Al compounds to reduce Al 2 o 3 and the number of AlN inclusions, and further stabilize the ratio of Mn / S;

[0034] 6. Precisely control the ratio of Mn / S at 3.49 to ensure th...

Embodiment 2

[0051] 1. Melt scrap steel in an electric furnace, blow oxygen to remove carbon and dephosphorize, make the oxygen content reach 500-1000PPm, and control the tapping temperature at 1630-1650°C;

[0052] 2. Transfer the molten steel from the previous step to the refining ladle for microalloying. According to the requirements of the S content in the product, add FeS first, and then add Fe-Mn according to the S content in the molten steel according to the Mn / S ratio of 3.54 ;

[0053] 3. Stir with argon for reduction, further make the elements in the steel more uniform, and make the inclusion of sulfide more uniform;

[0054] 4. Use firebricks to make slag, and firebricks contain Al 2 o 3 About 40%, SiO 2 About 60%, S in stable steel does not fluctuate;

[0055] 5. Use calcium carbide to deoxidize instead of Al and Al compounds to reduce Al 2 o 3 and the number of AlN inclusions, and further stabilize the ratio of Mn / S;

[0056] 6. Precisely control the ratio of Mn / S at 3....

Embodiment 3

[0073] 1. Melt scrap steel in an electric furnace, blow oxygen to remove carbon and dephosphorize, make the oxygen content reach 500-1000PPm, and control the tapping temperature at 1630-1650°C;

[0074] 2. Transfer the molten steel from the previous step to the refining ladle for microalloying. According to the requirements of the S content in the product, add FeS first, and then add Fe-Mn according to the S content in the molten steel according to the Mn / S ratio of 3.47 ;

[0075] 3. Stir with argon for reduction, further make the elements in the steel more uniform, and make the inclusion of sulfide more uniform;

[0076] 4. Use firebricks to make slag, and firebricks contain Al 2 o 3 About 40%, SiO 2 About 60%, S in stable steel does not fluctuate;

[0077] 5. Use calcium carbide to deoxidize instead of Al and Al compounds to reduce Al 2 o 3 and the number of AlN inclusions, and further stabilize the ratio of Mn / S;

[0078] 6. Precisely control the ratio of Mn / S at 3....

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Abstract

The invention discloses a homogeneous easy-cutting steel and a method for producing the same. The homogeneous easy-cutting steel comprises the following compositions (in percentage by weight): less than or equal to 0.12 percent of C, less than or equal to 0.07 percent of Si, 0.803 to 1.31 percent of Mn, less than or equal to 0.07 percent of P, 0.23 to 0.37 percent of S, less than or equal to 0.001 percent of Al and the balance being Fe and residual elements. The homogeneous easy-cutting steel has the advantages of heat processing, good cutting performance, etc. In the homogeneous easy-cutting steel produced by adopting the method, elements are uniformly distributed; sulfide impurities are uniformly distributed in a cambiform or an elongated cambiform, thereby removing adverse influence of the heat processing of FeS impurities and obviously improving the heat processing and easy-cutting performances of the produced homogeneous easy-cutting steel; and the part surface after being cut has better smoothness.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a homogeneous free-cutting steel and a production method thereof. Background technique [0002] Free-cutting steel is now mainly used in machinery manufacturing industries such as the automobile industry, instruments and meters, and standard parts. With the increasing application of CNC lathes, the requirements for steel cutting performance, especially the stability of cutting performance, are getting higher and higher. At present, iron and steel enterprises mostly use electric arc furnace to produce free-cutting steel, and smelt according to the composition specified in GB / T8731-1988 during the smelting process. The existing free-cutting steel varieties are mainly formed by adding free-cutting elements to the carbon steel series containing 0.10% to 0.50% carbon. The free-cutting elements include S and Pb, etc., but the free-cutting steel containing Pb has great l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C33/04C22B9/18
Inventor 高峰张洪良董国瑛兰宝玉
Owner LIAONING KAIRUI SPECIAL STEEL
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