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Prevention and Control of Oxidation and Decarburization in Heat Treatment:Protecting Surface Quality via Sealing and Atmosphere Control

2026-02-28

Prevention and Control of Oxidation and Decarburization in Heat Treatment:Protecting Surface Quality via Sealing and Atmosphere Control

At high temperatures, iron on the workpiece surface readily reacts with oxygen inside the furnace to form scale. Carbon may react with oxygen and carbon dioxide and escape, resulting in decarburization.

This reduces workpiece hardness and fatigue strength, and an excessively thick oxide layer also impairs the precision of subsequent machining.

The higher the temperature and the longer the holding time, the greater the risk of oxidation and decarburization. Low-carbon and medium-carbon steels are especially sensitive to this issue.

The core prevention and control technologies focus on dual control of atmosphere and sealing:

Adopt controlled protective atmosphere. Select nitrogen-based atmosphere, endothermic atmosphere, or ammonia-cracked gas according to process requirements.

Monitor carbon potential in real time using carbon-oxygen probes and infrared analyzers to maintain equilibrium with the surface carbon content of the workpiece, preventing decarburization or excessive carburization.
Upgrade the furnace sealing structure. Use graphite rope or silicone rubber gaskets for furnace doors, inspect and replace aged components weekly.

Conduct regular leak detection on dynamic and static sealing points such as fan shafts and thermocouple penetration devices to ensure a slight positive pressure of 20–40 Pa inside the furnace and prevent air ingress.
Optimize the heating schedule. Reduce the process temperature and shorten the high-temperature holding time while meeting performance requirements.

Use closed structures or protective covers during workpiece transfer to minimize exposure to air.

Phòng 13A07, tầng 14, tháp Tieshi Holding, số 471 đường Xinhua, quận Jianghan, thành phố Vũ Hán, tỉnh Hồ Bắc, Trung Quốc. E-mail: hbeikyn@163.com Tel: 18971549433 Tel: 18971549433

R&D và sản xuất lớn nhất Industrial Heat Treatment Furnace Nhà cung cấp ở Trung Quốc

8618971549433

18971549433

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Prevention and Control of Oxidation and Decarburization in Heat Treatment:Protecting Surface Quality via Sealing and Atmosphere Control

Prevention and Control of Oxidation and Decarburization in Heat Treatment:Protecting Surface Quality via Sealing and Atmosphere Control