Vacuum heat treatment is a heat treatment method, in which products are heated up and cooled down (in gas or oil) in a vacuum condition inside a furnace. Quenching steel in the atmosphere leads to a reaction between iron and oxygen to form scales on its surface. But vacuum heat treatment will not induce oxidation nor decarburization and leaves a bright surface.
Characteristics of vacuum heat treatment
| ○ | Bright surface even after heat treatment |
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| ○ | Vacuum leaves no space for oxidation nor decarburization |
| ○ | With less CO2 emitted, it is an environmentally friendly clean heat treatment. |
| ○ | It causes less dimensional change and smaller variation in hardness. |
| × | The treatment cost is usually high compared to other heat treatment methods due to expensive equipment. |
| × | It is normally processed in batches, so rush orders have to reserve a whole furnace. |
Characteristics of our company
| ・ | We have the largest-class furnace (1,300 x 1,300 x 1,650) to treat large and long pieces. |
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| ・ | The optimized setting actualizes the quenching with low distortion. |
| ・ | We have one of the largest sub-zero equipment (800 x 800 x 1,200) in Japan to carry out super sub-zero treatment (up to -196°C, called cryogenic treatment) that improves wear resistance. |
| ・ | The high load capacity furnace (2,720kg/gross) makes way for mass treatment of heavy pieces. |
| ・ | A continuous hydrogen furnace allows the low-cost solution treatment with a beautiful finish. |
| ・ | Because we own a continuous vacuum furnace, we can flexibly deal with a rush order. |
Equipment
| ・ | Large vacuum heat treatment furnace | 2 units | H 915 x W 915 x L 1,220 | (2 bar) |
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| ・ | Super large vacuum heat treatment furnace | 2 units | H 1,330 x W 1,330 x L 1,650 | (2.9 bar) |
| ・ | Vacuum heat treatment furnace | 2 units | H 600 x W 600 x L 1,050 | (10 bar) |
| ・ | Vacuum heat treatment furnace | 3 units | H 600 x W 600 x L 1,050 | (6 bar) |
| ・ | Vacuum tempering furnace | 2 units | H 600 x W 600 x L 1,050 | |
| ・ | Continuous vacuum heat treatment furnace | 1 unit | H 600 x W 600 x L 1,050 | (3 chambers) (2.8 bar) |
| ・ | Vacuum heat treatment furnace (oil cooling) | 3 units | H 600 x W 600 x L 1,050 | (Vacuum marquenching treatment capability) |
| ・ | Continuous hydrogen atmosphere furnace | 1 unit | H 200 x W 320 | Core tube size: 4,100 |
| ・ | Vacuum cleaning chamber | 2 units | H 650 x W 800 x L 1,300 | |
| ・ | Super large sub-zero equipment | 1 unit | H 800 x W 800 x L 1,200 | (Specification: -190°C) |