Riverside, MI – June 22, 2015 – Lindberg/MPH announced the shipment of an electrically heated gas nitriding pit furnace for a leading aerospace supplier. The pit furnace system performs a two stage nitriding process to achieve high surface hardness on A11 and H13 steel parts. To achieve optimal part quality the two stage nitriding process requires a state of the art operator interface for controlling process parameters and observing/archiving historical data.

The experienced staff at Lindberg/MPH designed a furnace solution that provides this precise control over the nitriding process and complies with AMS2750E specifications. After shipment, the service team provided the customer with installation and start-up support to ensure that the instruments and furnace were operating correctly with the atmosphere that is provided from the Ammonia Dissociator. The pit furnace has a maximum temperature rating of 1,250°F and a work chamber is 28” in diameter and 36” deep.

The furnace was constructed with low iron brick insulation to prevent reactivity with the furnace atmosphere. The advanced system monitors and controls furnace temperature, fan speed, atmosphere flow/composition, and cooling throughout the entire cycle. The nitriding gas flow control system has full automatic recipe control for each stage of the two stage nitriding process. The heating system utilizes heater coils designed with low surface watt density which extends service life of the coils.

A thermocartridge fan increases heat and atmosphere recirculation. An ammonia dissociator is included to provide dissociated ammonia during the second stage of the nitriding cycle and an incinerator ignites exiting combustible gases.

At Lindberg/MPH we provide advanced furnace controls so our customers have the highest quality part result. Our customer required precise control over their two stage nitriding process. This system provided an effective solution by controlling the furnace atmosphere, storing batch data, tracking alarm trending, while complying with AMS2750E specifications and removing potentially harmful exhaust gases.

Jason Dobberstein, Applications Manager

Unique features of this nitriding pit furnace include:

• Full color touch screen display interface with complete generator control software
• Paperless chart recorder
• Electric process atmosphere flowmeters
• Oxygen and hydrogen sensors
• AMS2750E Factory Uniformity Testing
• Bar code reader
• Rugged steel plate furnace construction
• Accelerated cooling
• Work basket & nesting trays
• Ammonia dissociator
• Gas incinerator
• Access platform