Draw Batch Oven Used for Stress Relieving Stainless Steel Shafts for Turbines


Wisconsin Oven designed and manufactured a gas-fired industrial draw batch oven with a powered load table for a company that repairs and refurbishes generators and steam or combustion turbines. The draw batch oven is used for stress relieving stainless steel shafts used in turbines after a welding process.

The Wisconsin Oven stress-relieving oven replaced the customer’s previous oven, which could not maintain the required temperature tolerance or required production capacity. The new stress-relieving oven provided a faster heat up rate and increased production capacity along with tighter temperature tolerances.

The heat-treating oven has basket dimensions of 5’0” wide x 7’6” high x 5’0” long and a maximum operating temperature of 1400º F. The batch oven was designed with the capacity to heat 2,000 pounds of steel from 500° to 1300° F within six (6) hours when the oven is preheated. Wisconsin Oven designed the draw batch oven with a horizontal sliding door instead of a vertical lift door due to the height restrictions at the customer’s facility. The powered load/unload table was rated at a capacity of 2,000 pounds. The stress relieving oven is fabricated with 4” of insulation in a CAN style construction. The inner shell and ductwork are fabricated with 18 gauge 309 stainless steel. The heating system features a 750,000 BTU per hour air heat burner including a motorized gas control valve, flame detector and flame relay with alarm horn. The recirculation system provides combination airflow and utilizes a 15,000 CFM @ 15 HP blower. The majority of the air is delivered under the work to flow vertically upward past and through the product to provide even heating and maximize temperature uniformity.

The stress-relieving oven has a UL certified NEMA 12 control enclosure with IEC style motor starters, push buttons, and pilot lights. The customer required a 9-point temperature uniformity of +/-20° F at 1365° F. The temperature for the draw batch oven is controlled by a digital West Pro-VU programmable controller and recorded by a Honeywell DR4300 10” circular chart recorder.

For more information, visit www.wisoven.com.