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Fiber-lined Box Furnace Shipped to a Titanium Steel Castings Manufacturer

L&L Special Furnace delivered the FB435, a highly uniform, front-loading box furnace to a U.S. supplier to the aerospace and power generation fields.

Posted: March 16, 2023

L&L Special Furnace’s FB435, an electric box furnace.

L&L Special Furnace has delivered a highly uniform, front-loading box furnace to a northeastern US supplier of titanium castings for the aerospace and power generation fields. The company deals with exotic metals such as nickel and cobalt-based alloys that are ideal for superior products using the lost wax process for castings. 

The L&L model FB435 has an effective work area of 48” wide by 32” tall by 60” deep and has certifiable temperature uniformity of ±10°F from 500 to 1,850°F. 

The furnace has elements that are very evenly spaced around the chamber. It is lined with ceramic fiber on the sides and top. The door is a pneumatically operated vertical door with a counterbalanced lift system. Included is a NEMA 12 control cabinet with fused disconnect switch, digital program controller, high-limit backup system, thermocouples, fusing, and all interconnection wiring.  

The control is a Honeywell DC2500 control with Ethernet capabilities with separate overtemperature protection. The power control is accomplished with six-zone SCRs with digital biasing and one control loop. The floor is composed of castable sections with insulating firebrick backup insulation. There is an 18” diameter, air-cooled fan to promote uniformity at lower temperatures. A 6” 600 CFM venturi cooling system is included with an outlet port along with a variable speed drive for controlled cooldown rates. 

The furnace case is sealed internally for atmosphere control. An inert blanketing gas such as nitrogen is used to displace oxygen present within the work chamber. This provides a better surface finish as oxidization is less likely to form on the part. The atmosphere is delivered automatically through a flow panel that is automated by the furnace control. 

All L&L furnaces can be configured with various options and be specifically tailored to meet your thermal needs. We also offer furnaces equipped with pyrometry packages to meet the latest revision of ASM2750. 

Options include a variety of control and recorder configurations. A three-day, all-inclusive startup service is included with each system within the continental US and Canada. International startup and training service is available by factory quote. 

If precise temperature control and uniformity is key to your process, then L&L’s FB series is a great choice. Please be sure to visit our website at 

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