High-Temperature Nitriding of Calorized Steel,
Abstract
To reduce the time required for the nitriding of calorized steel, the temperature of nitriding was increased without decreasing the hardness of the calorized layer. Specimens from steel St. 3 were conventionally calorized in powders at 950 degrees for 4-6 hr., obtaining a calorized layer of 0.45-0.55 mm with a hardness of 350-380 kgf/mm(superscript 2) and an Al concentration on the surface of 28-30 percent. To prevent the formation of a brittle layer during nitriding 0.15-0.17 mm of the surface was polished away. The nitriding was carried out at 600, 700, 800, and 850 degrees with holding times 1, 2, 4, and 6 hr. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1971
- Accession Number
- AD0729025
Entities
People
- A. F. Sofroshenkov
- L. G. Timonina
Organizations
- National Air and Space Intelligence Center