{"id":369,"date":"2023-01-25T19:30:19","date_gmt":"2023-01-25T18:30:19","guid":{"rendered":"http:\/\/haertha.dev.neuekommunikation.de\/wordpress\/?post_type=verfahren&p=369"},"modified":"2025-10-09T09:37:15","modified_gmt":"2025-10-09T07:37:15","slug":"salt-bath-hardening","status":"publish","type":"verfahren","link":"https:\/\/haertha.de\/en\/process\/salt-bath-hardening\/","title":{"rendered":"Salt bath hardening"},"content":{"rendered":"
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The process and its advantages\r\n<\/h2>\r\n \r\n <\/div>\r\n \r\n
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The objective of gentle salt bath hardening is to increase the hardness and the resistance of the material, with minimum warping. The process makes it possible to use a salt melt for both the heating and the cooling of the material.<\/b> As well as cyanides, which are frequently used as melting salts, barium salts and special tempering salts are used for tempering.<\/span><\/p>\n

The temperature of the salt melt (e.g. during salt bath nitriding<\/a>) usually ranges from 150\n\u00b0C to 1,300 \u00b0C. The typical temperatures for heating metal are between 800 \u00b0C and 1,200 \u00b0C. Temperatures between 140 \u00b0C and 250 \u00b0C (for staggered quenching, up to 450 \u00b0C) can be used to quench the material in the hot bath.<\/p>\n

Their temperature stability and gentle heat transfer make salt melts attractive options for annealing and hardening processes<\/b>. The slow cooling prevents the formation of vapour bubbles on the surface of the component. The process also causes a salt film to form on the workpiece, preventing undesired cooling effects like edge decarburising.<\/p>\n

Summary: The advantages at a glance<\/span><\/h3>\n
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  • Exceptionally uniform heat input<\/li>\n
  • Reduced crack formation<\/li>\n
  • Little warping<\/li>\n
  • No edge decarburising<\/li>\n
  • Optimised wear resistance<\/li>\n
  • High reproducibility<\/li>\n<\/ul>\n

    Salt bath hardening is characterised as a particularly flexible and dependable process. Our experts at H\u00e4rtha will gladly advise you on the details.<\/p>\n

    Info
    \nOwing to the toxicity of the salts used, salt bath hardening is incorrectly regarded as outdated, even though is still widely used in industrial applications. Today, modern processes and less aggressive salts ensure improved recyclability and environmental compatibility.<\/span><\/p>\n<\/p>\r\n

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