Free-cutting stainless-steel material for precision processing and process for producing same

A precision machining, stainless steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of undisclosed surface properties, corrosion resistance, easy-cutting stainless steel raw materials, etc., to achieve electrical energy consumption, meet processing accuracy, and excellent processing accuracy Effect

Inactive Publication Date: 2015-01-14
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Thus, a free-cutting stainless steel raw material for precision machining with excellent surface properties after machining and excellent corrosion resistance and a method for producing the same have not been disclosed until now.

Method used

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  • Free-cutting stainless-steel material for precision processing and process for producing same
  • Free-cutting stainless-steel material for precision processing and process for producing same
  • Free-cutting stainless-steel material for precision processing and process for producing same

Examples

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Embodiment 1

[0033] (Example 1) A commercially available austenitic stainless steel (SUS304) round bar (weight 2 kg) was used as a melting raw material, and was melted using a water-cooled crucible suspension melting furnace (Japanese: Koldkuru-shibur floating melting furnace). The component composition (mass %) of the molten raw material was 0.06% C, 0.28% Si, 1.33% Mn, 0.035% P, 0.025% S, 8.05% Ni, and 18.39% Cr. During melting, N was sealed in the vacuum induction melting furnace at 0.07 MPa to adjust the N concentration in the molten steel. After melting, add a specified amount of commercially available ferroboron (19.2 mass% B) to the molten metal, adjust the B concentration, melt in a weakly reduced pressure N atmosphere, and then keep it at 1600°C for 10 minutes, and then cool it in water. solidified in a crucible to make ingots. The ingot was forged and rolled at 1200° C., processed into a 14 mm square bar, and air-cooled. The bar was subjected to water cooling after holding at 1...

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Abstract

The present invention provides a free-cutting stainless steel material for precision machining capable of attaining all of excellent cutting accuracy, machinability, corrosion resistance, and environmental friendliness at the same time and a method for producing the same material. The free-cutting stainless steel material for precision machining of the present invention is used for forming performed by cutting of a micrometer level, and is characterized in that a free-cutting additive is h-BN particles that are distributed in a simple substance state in a steel. Also, the method for producing the free-cutting stainless steel material for precision machining of the present invention is characterized in that a free-cutting stainless steel material for precision machining in which h-BN particles precipitate is heated followed by rapid cooling to make the h-BN particles once dissolve and disappear, and subsequently is tempered, whereby the h-BN particles are dispersedly precipitated again evenly in the material.

Description

technical field [0001] The present invention relates to a free-cutting stainless steel raw material for precision machining formed by micron-order cutting. Background technique [0002] Conventionally, stainless steel has been used as a raw material for machining precision parts in order to take full advantage of its corrosion resistance. However, in precision machining, stainless steel is more difficult to cut than ordinary steel, so it is desired to improve its machinability. Sulfur free-cutting stainless steel SUS303 is widely known as a stainless steel with improved machinability, but its surface becomes rough after cutting, and it is considered difficult to use it for micron-order precise cutting. In other words, it is considered that conventional stainless steels do not have machinability and precision workability (surface roughness after cutting) at the same time. [0003] International patent application WO2008 / 016158 discloses a free-cutting stainless steel capable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21C7/00C21C7/04C21C7/072C21C7/10C21D6/00C22C38/54
CPCC21C7/072C22C38/54C21C5/005C21D9/00C22C33/04C22C38/002C21C2007/0018C22C38/04C22C38/40C21D6/004C21C7/0006C21D6/002C21D9/0068C22C38/02C22C38/001C22C38/00
Inventor 江村聪山本重男樱谷和之津崎兼彰
Owner NAT INST FOR MATERIALS SCI
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