The companies, which possess recent technologies in casting, machining, heat treatment, surface treatment,
   and assembling, in Okayama ally to manufacture complex aircraft components for our customers.
>> Japanese
■ Contact・・・Executive Managing Director Hideji Ogino
■ Phone・・・・・Phone.+81-865-65-1555  FAX.+81-865-65-1560  E-Mail:
Ask us anything about heat treatment!
■PR movie is seen.■
vacuum heat treatment furnace【Technology and Product】
One of only a few domestic makers of small flat bar steel products
The main raw material we use is sheet-steel (produced using blast furnaces and electric furnaces). In addition to the sheet-steel, we are qualified to process JIS G 3101 (rolled steel for general structures) so that rolling of SS standard materials, special alloy steel, and SUS steel is also possible.
Heat treatment
As a general heat treatment supplier, we provide raw material refining, carburizing, high-frequency hardening, vacuum heat treatment, and aluminum T6 processing services. At the same time, after-processes such as annealing, sand blasting and painting can be done in the same factory. This means a series of processing can be completed in a short time. (We also have a machining plant with flat-surface grinding machines).
■ Advantages
In the case of heat treatment of one-time orders, the sophisticated skills of each worker who is involved in the heat treatment are required; therefore, almost all of our employees, except for newcomers, are qualified as heat treatment technicians.
Full automatic carburizing line■ Qualification
●Heat treatment technicians (General and basic): 1 Supreme, 19 Grade-1, 7 Grade-2
●Heat treatment technicians (High-frequency and flame hardening): 2 Grade-2
●Heat treatment technicians (Composition testing): 6 Grade-1
●Painting technician (metal painting): 1 Grade-2
■ Range of application
●Casting & forging, metal hardening, tempering, normalizing, and annealing
●Stainless steel hardening, tempering, and solid solution treatment
●T6 and T4 treatment of aluminum alloy
●Anoxic hardening, vacuum hardening, high-frequency hardening, carburizing, and carbonitriding
●Large canning products and annealing of cast products
●sand blasting and painting
Pit-type non-oxidizing furnaceAluminum solution treatment furnace

【Company Profile】
■ Company Name Koyo Sangyo Co., Ltd.
■ Representative CEO Takashi Kitayama
■ Address 〒714-0005
 777 Shinga, Kasaoka, Okayama, Japan
■ Establishment 1955
■ Capital 49.5 million yen
■ Employees 89
■ Major products Heat treatment in general, hot roll, flat-surface grinding, shot blast, painting,
rolled steel materials for general construction
(small flat steel, round steel, square steel, I-section steel)
■ Remarks ISO9001 certified in 2001
QA certified by Komatsu and Mitsubishi Motors
Komatsu Fork Lift Co., Ltd., KOBELCO CRANES Co., Ltd.
■ Web site URL
Koyo Sangyo Co., Ltd.
Major Equipment

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