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Free machining steel for machine structural use having improved chip disposability

A free-cutting steel and processing technology, applied in the field of free-cutting steel for machine structures of free-cutting materials, can solve problems such as

Inactive Publication Date: 2006-08-23
SANYO SPECIAL STEEL COMPANY
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  • Abstract
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  • Claims
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Problems solved by technology

However, the proposed structural steel is far from a steel that can be used as a substitute for leaded free-cutting steel with satisfactory properties in terms of its chip treatability

Method used

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Embodiment Construction

[0025] Reasons for limiting the respective components of the free cutting steel for machine structure with improved chip treatability according to the present invention will be explained below. In the chemical composition of the steel, "%" means mass percentage.

[0026] Carbon (C) is an element added to ensure the strength of steel. When the content of carbon is less than 0.01%, the strength of the steel is not satisfactory. On the other hand, when the content of carbon exceeds 0.70%, the toughness of steel deteriorates. Therefore, the carbon content of the steel according to the invention is limited to 0.01% to 0.70%.

[0027] Silicon (Si) is an element added during steelmaking for deoxidation and ensuring the strength of steel. When the silicon content is less than 0.05%, a satisfactory deoxidation effect cannot be obtained. On the other hand, when the silicon content exceeds 2.00%, hot workability deteriorates. Therefore, the silicon content of the steel according to ...

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Abstract

Disclosed is a free machining steel for machine structural use, which can realize very good chip disposability without incorporation of any harmful material such as lead (Pb). This free machining steel is a hot rolled or hot forged free machining steel having improved chip disposability. The free machining steel comprises, by mass, carbon (C): 0.01 to 0.70%, silicon (Si): 0.05 to 2.00%, manganese (Mn): 0.20 to 3.50%, calcium (Ca): 0.0003 to 0.01%, sulfur (S): 0.020 to 0.300%, aluminum (Al): 0.002 to 0.300%, nitrogen (N): 0.003 to 0.035%, and oxygen (O): 0.0010 to 0.0080% with the balance consisting of iron (Fe) and unavoidable impurities. The steel comprises sulfides having the major axis of from 0.5 mum to 20 mum, exclusive, and comprising MnS as the main component, in a number of not less than 30% of the total number of sulfides. The steel also comprises oxide inclusions having the major axis of from 0.5 mum to 50 mum, exclusive, and being present either together with sulfides or singly, in a number of not less than 10 per mm<2>of the inspection area.

Description

technical field [0001] The present invention relates to a free-cutting steel for machine structure including various free-cutting materials for reducing cutting costs, and in particular, to a free-cutting steel for parts including automobile parts. Background technique [0002] Currently, in steels for machine structures used for parts including automobile parts, various free-cutting materials have been added to reduce costs. Representative examples of these free cutting steels include lead-added free cutting steels, (re)sulfurized free cutting steels, (added) calcium deoxidized free cutting steels, and complex / multiple free cutting steels produced by using the above free cutting materials in combination . [0003] Among them, the use of leaded free cutting steel is the most common, because compared with base steel, leaded free cutting steel is less likely to cause the decline of mechanical properties, and is effective in improving machinability, especially tool life or chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/00C22C38/60
CPCC22C38/60C22C38/001C22C38/02C22C38/04
Inventor 常阴典正
Owner SANYO SPECIAL STEEL COMPANY
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