Quenching steel with engine oil is a practice that should be avoided due to significant health, safety, and environmental risks. While it may seem like a convenient and cost-effective option, the repercussions far outweigh the benefits.
Chemical Hazards:
Engine oil is a complex blend of hydrocarbons, additives, and contaminants. When heated during the quenching process, it releases a variety of harmful fumes, including:
- Benzene: A known carcinogen, long-term exposure to benzene can lead to blood disorders such as anemia and even increase the risk of leukemia.
- Formaldehyde: Classified as a carcinogen, it poses risks of respiratory issues and skin irritation.
- Polycyclic Aromatic Hydrocarbons (PAHs): These compounds are linked to skin, lung, and other cancers upon long-term exposure.
- Acetaldehyde: A probable carcinogen, it can cause eye and skin irritation.
- Acrolein: Known for causing respiratory issues, it may also contribute to heart disease.
- Carbon Monoxide: An odorless gas that can cause headaches, dizziness, and in extreme cases, can be fatal.
Health Risks:
The health implications of exposure to these chemicals range from immediate symptoms like headaches and respiratory irritation to long-term risks such as cancer and neurological damage. The fumes can be especially harmful in a closed environment, posing severe health risks to the bladesmith.
If you cannot use commercial oil quenchants Canola and Mineral oil are better and safer options.
I cannot think of any reasons to be quenching steel with engine oil, and there are many reasons not to.
