Vacuum hardening is a steel quenching process carried out in a vacuum environment to form a martensitic microstructure with high hardness. This method was developed to meet the heat treatment requirements of high-alloy steels, tool steels, and stainless steels, where a clean surface, minimal distortion, and the avoidance of oxidation and decarburization during heating are critical.

Description
Unlike conventional quenching in gas-fired or salt bath furnaces, vacuum hardening employs a high-vacuum atmosphere combined with high-pressure inert gas cooling (commonly N₂, Ar, or He) as a substitute for oil or salt quenching media.


Applications
Vacuum hardening technology is widely applied in:
Tool steels: Cutting knives, stamping dies, plastic injection molds, precision measuring tools, drill bits, turning tools, and milling cutters.
Stainless steels and high-alloy steels: Precision mechanical components, aerospace parts, medical devices (surgical knives, surgical instruments), and electronic components.
Automotive industry: Gears, shafts, bearings, and high-load components requiring clean surfaces and high dimensional accuracy.
Energy sector: Turbine components, heat-resistant parts, and oxidation-resistant components.

Thanks to its advantages of bright surface finish, minimal distortion, and environmental friendliness, vacuum hardening has become a standard advanced heat treatment technology in modern industrial manufacturing.
With a team of seasoned engineers, a production workshop equipped with state-of-the-art technology, and a profound sense of responsibility, Metal Heat consistently ensures and commits to delivering absolute trust to customers through products of the highest quality.
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