AMS 2750E / CQI-9 / Furnace specifications

AMS 2750E (aerospace) and CQI-9 (automotive) - These specifications cover pyrometric requirements for thermal processing equipment used for metal heat treatment. It covers temperature sensors, instrumentation, thermal processing equipment, system accuracy tests (SAT), and temperature uniformity surveys (TUS). These are necessary to ensure that ferrous and non-ferrous materials like tool steels, Titanium and aluminum alloys are heat treated in accordance with the applicable process specification(s) and standards like AMS 2770, AMS 2771, AMS 2772, MIL-H-81200.

For more detailed information on AMS2750E we refer you to the Industrial Heating article.

CQI-9 is commonly used in the automotive industry. The instrumentation requirements are a little less stringent than AMS 2750E.

NADCAP AS7102 (Requirement for Heat Treating) auditors certify that manufacturers are following all process requirements including furnace pyromotry AMS 2750E or CQI-9 for heat treatment of materials. Common furnaces and ovens used in these industries:

• Bottom drop and continous furnaces for aircraft parts
• Box furnaces
• Tool room and laboratory furnaces

For the heat treater, the most important information is found in the heat treating specifications (examples: AMS 2759E, MS 2759/11, AMS 2770J, AMS 2771E, AMS 2772F) of the materials. This dictates what furnace / oven temperature uniformity (furnace class) and instrumentation type he needs to use.

Many Industries have developed their own pyrometry specifications for furnaces and ovens; but most of them refer to AMS 2750E.