Free-cutting stainless-steel material for precision processing and process for producing same
A technology of precision machining and manufacturing methods, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of undisclosed surface roughness, undisclosed surface properties, corrosion resistance and free-cutting stainless steel raw materials, etc., to meet environmental friendliness, Realize the effect of electrical energy consumption and productivity improvement
Inactive Publication Date: 2013-01-30
NAT INST FOR MATERIALS SCI
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Problems solved by technology
In this invention, the corrosion resistance is the same as that of conventional stainless steel materials, and the machinability is improved by about 25%, but the surface roughness after cutting of this material is not disclosed.
[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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Embodiment 1
[0032] (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 125...
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Abstract
Provided are a free-cutting stainless-steel material for precision processing which can satisfy all of excellent cutting precision, cuttability, corrosion resistance, and environmental preservation at the same time and a process for producing the stainless-steel material. The free-cutting stainless-steel material for precision processing is a material to be formed by cutting on the order of micrometer, and is characterized by containing a material for imparting cutting workability which is constituted of h-BN grains and has been dispersed as primary particles in the steel. The process for producing a free-cutting stainless-steel material for precision processing is characterized by heating a free-cutting stainless-steel material for precision processing in which h-BN grains have been precipitated, thereafter quenching the material to eliminate the h-BN grains through formation of a solid solution thereof, and then tempering the material to thereby precipitate h-BN grains again which are evenly dispersed 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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IPC IPC(8): C22C38/00C21C7/00C21C7/04C21C7/072C21C7/10C21D6/00C22C38/54
CPCC22C38/54C21D9/00C21C5/005C22C33/04C22C38/002C22C38/04C22C38/40C21D6/004C21C7/0006C21D6/002C21D9/0068C22C38/02C22C38/001C22C38/00C21C7/072C21C2007/0018
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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