{"id":13391,"date":"2026-05-07T14:54:08","date_gmt":"2026-05-07T14:54:08","guid":{"rendered":"https:\/\/www.jstconsultancy.cz\/?p=13391"},"modified":"2026-07-31T21:58:51","modified_gmt":"2026-07-31T21:58:51","slug":"high-temperature-oil-250c-in-vacuum-is-this-the-way-to-bainite-without-a-salt-bath-langen","status":"publish","type":"post","link":"https:\/\/intelligent-kalam.80-240-27-133.plesk.page\/en\/high-temperature-oil-250c-in-vacuum-is-this-the-way-to-bainite-without-a-salt-bath-langen\/","title":{"rendered":"High-temperature oil 250 C in vacuum: Is this the way to bainite without a salt bath?"},"content":{"rendered":"

The world is still full of innovations. ECM<\/strong> has started to supply vacuum furnaces with oil quenching up to 250 C<\/strong>. There are two variants: ECO 1299<\/strong> and multi-chamber Flex.<\/strong> This is a unique solution, when we are already moving on the border of bainitic quenching. What are the advantages?<\/p>\n

This type of quenching is currently carried out in salt, usually AS140.<\/strong> However, the use of salt has some disadvantages. First of all, it is more energy-intensive than an oil bath. The salt bath must be heated continuously, even when we have no work, but if we have to let it cool down, its reheating requires a special process. It also has its own maintenance problems, requiring filtration, replenishment and cleaning. It is also highly aggressive in terms of corrosion and requires high-quality rinsing and passivation. It represents an ecological and safety burden. Because austenitization takes place in a retort chamber, under a methanol\/nitrogen atmosphere, we have a problem with both carbon potential management and emissions. For parts that are nitro-cemented, we also have to deal with ammonia. Typical representatives of this technology are furnaces from SOLO or Codere.<\/p>\n

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Fig. 1<\/strong> <\/span>\u2013 Bainite hardening in a salt bath in a Codere type furnace<\/em><\/p>\n

With vacuum oil quenching, or vacuum furnaces with LPC<\/strong> with oil quenching, many problems either do not occur at all or are simpler. At a minimum, we do not need any probes, methanol or ENDO, we do not have to perform daily calibrations, we do not have to worry about oil, surface corrosion or how to burn off residual gases at the outlet. Only the design of the vacuum furnace oil bath for these temperatures will be complicated. Even more complicated is the quenching oil. ECM<\/strong> has been verifying this technology with Quaker Hougton<\/strong> on MAR-TEMP VH 300<\/strong> oil. This is based on synthetic ester oils. It is characterized by having:<\/p>\n