A heat treatment callout on a drawing is a specific notation or symbol used to indicate the required heat treatment process for a particular component or part.
This callout provides instructions to the manufacturer or fabricator regarding the heat treatment steps that need to be performed to achieve the desired material properties.
However, Heat treatment callout are not defined in AWS A2.4 or ISO 2553 specification, engineering drawing specifies callouts to mention the heat treatment requirements for the particular job.
heat treatment callout on drawing
The heat treatment callout on a drawing typically includes the following information:
- Heat Treatment Specification: This specifies the industry-standard or customer-specific heat treatment specification that needs to be followed. It may refer to standards such as ASTM, AMS, or specific customer requirements.
- Heat Treatment Process: The specific heat treatment process, such as annealing, quenching, tempering, normalizing, or solution heat treatment, is mentioned. It describes the transformation the material needs to undergo to achieve the desired properties.
- Temperature and Time: The required temperature and duration of the heat treatment process are specified. This ensures that the material is exposed to the correct temperature for an adequate period to achieve the desired transformation or property changes.
- Cooling Method: In some cases, the cooling method after heat treatment might be specified. For example, if a rapid cooling rate is required, it may be denoted as “quench in oil” or “quench in water.”
- Additional Instructions: Any additional instructions or specific requirements related to the heat treatment process may be mentioned. This can include information about surface finish, protective atmosphere, or any other special considerations.
Does Heat Treatment Callouts are common in drawing?
While heat treatment callouts are commonly used in certain industries, such as aerospace, automotive, and tooling, their presence on engineering drawings may vary depending on the specific application and design requirements.
In some cases, heat treatment instructions may be provided in separate specifications or documents rather than directly on the drawing itself.
Examples of industries where heat treatment callouts are commonly used
some examples of industries where heat treatment callouts are commonly used:
- Tool and Die
- Oil and Gas
- Heavy Machinery
- Steel and Metal Production
- Tooling and Machining