SAE - AMS2759/7E
Carburizing and Heat Treatment of Carburizing Grade Steel Parts
|Publication Date:||1 September 2021|
This specification, in conjunction with the general requirements for steel heat treatment covered in AMS2759, establishes the requirements and procedures for three classes of gas, vacuum, liquid, and low pressure (LPC) carburizing and related heat treatment of parts fabricated from carburizing grade steels. Parts made from steels other than those specified in the detail specifications may be heat treated in accordance with the applicable requirements using processing temperatures, times, and other parameters recommended by the material producer unless otherwise specified by the purchaser. This specification does not cover pack carburizing.
Parts shall be carburized to meet specified requirements (typically drawing directive) by processing to one of the following classes:
Class 1: Case depth and case hardness shall be as specified. Subsurface case hardness shall be in accordance with Table 3. Retained austenite shall not exceed 10%. Intergranular carbides shall be scattered and discontinuous and shall not be evident in more than 40% of the grain boundaries (see 188.8.131.52).
Class 2: Case depth and case hardness shall be as specified. Subsurface case hardness shall be in accordance with Table 3. Retained austenite shall not exceed 20%. Continuous carbide network shall not be evident in more than 80% of the grain boundaries (see 184.108.40.206).
Class 3: Case depth and case hardness shall be as specified.
If class is not specified, parts shall be processed to Class 2 requirements.
Case depth requirements specified to the heat treat processor are those expected to be developed by the carburizing heat treatment. The case depth must include both the final case depth for the finished part and any machining/grinding stock the purchaser intends to remove.
Safety - Hazardous Materials
While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards that may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.