400C

400C commonly refers to a temperature: four hundred degrees Celsius. The C stands for Celsius. In this context, 400°C equals 752°F or 673.15 kelvin. The designation appears in scientific, engineering, and industrial settings where precise heat treatment, processing, or testing conditions are specified.

In metalworking and materials processing, temperatures around 400°C are often used for tempering or aging certain steels and alloys to achieve a balance of hardness and toughness. The exact effects depend on the alloy composition and the prior heat treatment the material has undergone. In other domains, such as ceramics and glass, 400°C may be employed for drying, debinding, annealing, or preheating steps, with higher temperatures providing the final sintering or firing.

Safety and materials considerations are important at 400°C. Many plastics, coatings, and adhesives begin to soften, degrade, or combust at elevated temperatures, and specialized equipment or heat-resistant materials may be required to handle or contain heat at this level. Proper insulation, ventilation, and protective measures are typically necessary in industrial environments.

Ambiguity: The label 400C can also appear as a model number or designation in products such as ovens, kilns, or other equipment. Without context, it is not possible to identify a specific object or device solely from the term 400C.

See also: Celsius, temperature scales, heat treatment.