Improving Tempering Heat Treatment Furnace Efficiency with Emisshield Coatings

Emisshield ST-1 was coated on the interior of a heat treatment furnace lined with ceramic fibre modules to study the specific benefits provided by the coating. The operating temperature of the furnace was 1350°F/ 732°C.

The Process

Two identical heat treating furnaces were used to temper 1200 lb loads. Of these, one was coated with Emisshield ST-1 on the interior while the other furnace was not coated. Temperature readings were noted at periodic intervals in both the furnaces and tabulated.

The Results

Time Temperature in the furnace coated with Emisshield ST-1 Temperature in the uncoated furnace
10:30 a.m. 200°F/93°C 200°F/93°C
11:00 a.m. 1000°F/538°C 900°F/482°C
11:30 a.m. 1150°F/621°C 1050°F/566°C
12:00 p.m. 1250°F/677°C 1150°F/621°C
12:30 p.m. 1350°F/732°C 1225°F/663°C
1:00 p.m. 1350°F/732°C 1300°F/704°C
1:30 p.m. 1350°F/732°C 1350°F/732°C

As can be seen from the table, the furnace coated with Emisshield ST-1attained the operating temperature one hour earlier than the uncoated furnace. It was also observed that the Emisshield coated furnace cooled faster than the other, reaching 600°F/316°C in just 13 minutes compared to 20 minutes taken by the uncoated furnace.

The Benefits

The measurements clearly indicate that applying Emisshield ST-1 can help in reducing the time taken by heat treating furnaces to reach the operating temperature by more than 30%, thus enhancing their efficiency.

This information has been sourced, reviewed and adapted from materials provided by ANH Refractories Europe.

For more information on this source please visit ANH Refractories Europe.

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