Lindberg/MPH shipped an electrically heated, steam atmosphere pit furnace to a tooling manufacturer for steam treating parts. Manufacturers use the steam-treating process to create a uniform blue-black finish on the surface of parts that improves wear and corrosion resistance. The furnace has a maximum temperature rating of 1250°F (677°C), work-chamber dimensions of 22 inches in diameter x 36 inches deep and a maximum gross workload of 1,200 pounds. It is designed for a pit-type installation if required. The custom lid assembly utilizes a pneumatically operated boom lift with electric swing.

Lindberg/MPH shipped a gas-fired cyclone pit furnace to a manufacturer. The furnace has a maximum operating temperature of 1400°F (760°C) and a gross load capacity of 2,750 pounds. The medium-velocity burner and combustion train is estimated at 355,000 BTU/hour. The furnace’s load space is 25 inches in diameter and 36 inches high. The outer shell is constructed of industrial steel and has an alloy liner backed up with insulating brick and block insulation.

Lindberg/MPH shipped two electrically heated nitrogen pit furnaces to a manufacturing company. The furnaces are configured for process applications requiring a maximum furnace temperature of 1250°F (677°C) in a nitrogen atmosphere. The load space is 39 inches in diameter and 49 inches deep, but the chamber is larger and provides clearance for loading baskets and fixtures. There is a maximum workload of 4,980 pounds. A set of type-K thermocouples are installed to measure the temperature of the atmosphere before entering the workload. One thermocouple is for the process temperature controller, and the other is for the high-temperature controller.

SECO/VACUUM (SVT), a SECO/WARWICK Group company, received an order for a pit gas-nitriding furnace from a North American manufacturer. According to SECO/WARWICK, this will be one of the largest pit furnaces it has ever built. The North American company chose SVT because of its experience in gas nitriding and ferritic nitrocarburizing process development.

L&L Special Furnace Co. Inc. manufactured and supplied a high-uniformity, pit-style furnace used for annealing to a manufacturer of aerospace fasteners. The annealing process occurs when the parts are evenly heated to 1400°F (760°C) and held for a predetermined amount of time. Temperature uniformity is critical to this process, and both ambient and load temperature must maintain ±10°F throughout the cycle. The fastener parts are placed in baskets and loaded by an overhead crane into the furnace. There are guide bars to ensure that the load is centered and cannot damage the furnace liner. The program or recipe is entered into the program control, and the cycle is started. At the completion of the cycle, the parts are removed and are ready for inspection and shipment.

Lindberg/MPH shipped a gas-fired nitriding pit furnace with built-in retort to a company in the welding industry. The furnace is designed for single- and two-stage nitriding processes and post-oxidation applications. The design accepts either one-piece work baskets, retort baffle or nest trays. The gross load capacity is 5,000 pounds at 1200°F, and the furnace chamber has dimensions of 38 inches in diameter and 90 inches high. The furnace is designed to produce laminar airflow to obtain the required +/-15°F temperature uniformity.

Lindberg/MPH shipped an electrically heated pit furnace to a manufacturer in the power industry. The furnace is designed with a maximum operating temperature of 1750°F and gross workload of 1,600 pounds. It can accommodate a work basket 25 inches in diameter and 48 inches deep. A retort minimizes atmosphere consumption and furnace conditioning time between loads. The cover lid utilizes an electrically operated boom lift, which provides ease of loading and unloading. An upper furnace fence guard was also installed to provide added safety.

Lindberg/MPH shipped two electrically heated pit furnaces to the automotive industry. The nitrogen atmosphere furnaces, which will be used to heat treat automotive parts, utilize high-velocity forced convection heating systems inside an atmosphere-tight retort chamber and have a maximum operating temperature of 1250°F. The work chamber is approximately 50 inches in diameter and 60 inches deep. The units’ overall dimensions are 101 inches wide x 90 inches long x 148 inches high with a working height of 110 inches and a maximum load gross weight of 10,000 pounds.

JGEF Furnace manufactured and shipped a customized oxidation nitriding furnace. The pit furnace, which has useful dimensions of 43.3 inches (1,100 mm) in diameter x 70.9 inches (1,800 mm) high, has a maximum temperature rating of 1292°F (700°C). The goal for this project was to represent an advanced solution for metallic parts. The furnace includes an advanced oxidation system that ensures the workpieces are preheated in a controlled oxidizing atmosphere and guarantees corrosion resistance, which in turn facilitates nitrogen uptake and growth of the nitride compound layer.