One Minute Mentor: Continuous Operating Furnaces for Tool Steel Strips

The continuous heat treatment of tool steel is applied to low- or medium-alloyed carbon steel strips as well as martensitic stainless steels. The described lines produce high-quality strip with respect to uniform structure, flatness, and bright surface finish. Steel grades with 0.4 to 1.2% C, low and high alloyed, can be processed. Strip dimensions range between 10 to 750 mm (0.4 to 29.5 in.) wide and 0.05 to 4 mm (0.002 to 0.16 in.) thick. High quenching rates are necessary, especially for plain carbon steels. Cooling gradients of up to 600 K/s are possible in a molten lead-bismuth quench. Because two-stage quenching technology provides considerable advantages over quenching in oil, this method has been adopted worldwide. It is also possible to achieve isothermal transformation to bainite and pearlite using a molten metal quench, so this type of hardening and tempering line is extremely versatile.

The configuration of a high-performance line involves an entry and exit section of the strip handling equipment (Fig. 10). The hardening section consists of the austenitizing furnace, the molten metal quench or hydrogen quench, and a martensite cooler. Beyond the martensite cooler the strip is martensitic and fully hardened, and then it passes through the tempering section—consisting of a leveling furnace, tempering furnace equipped with an atmosphere recirculation system, and an atmosphere jet cooler—to finally leave the facility, completely flat, with a bright surface finish and tempered to very uniform tensile strength.

For more information, click on the link below (subscription required). Then scroll to Figure 10

R Schneider ; R. Mesquita ; H. Altena ; T. Müller ; P. Seemann,Processes and Furnace Equipment for Heat Treating of Tool Steels, ASM International, 2014, https://doi.org/10.31399/asm.hb.v04d.a0005958

Multi-furnace heat treat project for major steel forger

Nutec Bickley, Mexico, has been awarded a contract to manufacture and install five new lift-up furnaces, along with a fully modernized combustion system, for a leading U.S. manufacturer of high-quality alloy steel and carbon steel closed-die forgings. The project will take place between May and December 2023, with onsite work completed one furnace at a time to ensure the customer’s production schedules are not impacted. Two of the new furnaces will be used for tempering, while the remaining three will be used for austenitizing. Each furnace will be fitted with the latest control systems, complete fiber flues, and new exhaust and pressure control systems, along with insulation.

Nutec Bickley’s state-of-the-art combustion packages will be fully compliant with NFPA 86 standards, incorporating a fuel-only control system to allow maximum temperature uniformity potential for all cycles. The retrofitted furnaces will benefit from high-velocity nozzle mixing burners fitted with high-temperature burner blocks. The combustion systems will also feature automatic air control valves to adjust the maximum air volume used and to ensure proper burner ignition conditions.

The project will involve careful teamwork between the customer and Nutec Bickley to ensure successful delivery and highest quality outcomes. Rodrigo González, VP Metals at Nutec Bickley, emphasized the importance of constant communication and status updates with customers for a dynamic and mutually beneficial project result.

 

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Ipsen repurposes ceramics facility for expanded hot zone production capacity

Ipsen, Pecatonica, Ill., formerly known as Ipsen Ceramics, is expanding its vacuum furnace hot zone assembly. The refurbishments include new lighting, HVAC, roofing, and other interior and exterior upgrades. Located at 325 John Street, less than 30 miles from Ipsen’s Vacuum Technology Excellence Center in Cherry Valley, the factory will initially employ up to eight material assemblers.

Incorporating the Pecatonica location into Ipsen’s vacuum furnace production and aftermarket process will provide added benefits to customers. Jake Hamid, Ipsen’s director and chief Operating Officer, stated that “Our goal is to reduce delivery times and better control the critical phase of assembly.” In the future, Ipsen is considering other manufacturing activities in Pecatonica to supplement the needs of the Vacuum Technology Excellence Center.

The move to repurpose the Pecatonica plant aligns with Ipsen’s commitment to providing high-quality vacuum furnace equipment and services to customers. The company’s dedication to meeting customer needs and reducing delivery times will be further enhanced by this strategic move, ensuring that Ipsen remains a leader in the vacuum furnace industry.

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Wisconsin oven ships pin conveyor oven to automotive manufacturer

Wisconsin Oven Corp., East Troy, has shipped one electrically heated conveyor oven to an automotive manufacturer, which will be used for tempering automotive parts. The conveyor oven features a chain style conveyor system with vertical pins, ensuring the uniform transfer of parts through the heating and cooldown zones of the oven. The maximum temperature rating of the conveyor oven is 260° C, with interior chamber dimensions of 3’6” W x 20’10” L x 9” H.

The conveyor oven also features a top-down bottom-up airflow configuration designed with a 55,000 CFM @ 50 HP blower, ensuring optimal temperature uniformity of ±2.5° C at 163°C, documented with a temperature uniformity test. The oven is equipped with a continuous chain conveyor with vertical pins, programmable temperature controller, and recorder with Ethernet capabilities.

The unique features of this tempering oven include the ability to automatically scan the parts while being loaded onto the conveyor and validate that the correct part is being loaded, providing a pass/fail regarding heating time and temperature. The conveyor oven also includes an ambient cooldown zone and supervised installation with start-up and training.

Mike Grande, vice president of sales,said that, “Our continuous designs provide customers with innovative solutions to meet their load and process requirements. This conveyor oven was designed with high-velocity impingement air nozzles for rapid, uniform heating and optimal part results.” The equipment was fully factory tested and adjusted prior to shipment from the facility, ensuring it met all Wisconsin Oven quality standards. The equipment comes with a 2-year warranty, providing peace of mind for the automotive manufacturer.

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Leading die manufacturer adds Seco/Vacuum furnace to increase capacity

Seco/Vacuum, Meadville, Pa., has announced that a U.S.-based international manufacturer has placed an order for a Vector high-pressure gas quench furnace. The new furnace will increase the partner’s heat treat capability while improving part quality. The Vector will allow the partner to heat treat larger parts, at higher quantities per cycle than their existing furnace, all with improved quality control and reliability.

The partner’s equipment requires the use of large dies that require precise heat treating. Their current heat treatment setup includes a pair of vacuum furnaces, which have some limits compared to the Vector they are about to receive.

The new furnace, a bottom loading Vector vacuum furnace with 6 bar nitrogen gas quench, has a 60″ diameter, 72″ tall, and a 3-ton capacity working zone. It is equipped with convection heating which allows them to run their tempering cycle in the same furnace without having to move parts after hardening, a tremendous time and labor savings.

The furnace is also equipped with SECO/WARWICK’s FineCarb low-pressure carburizing system for future process developments. The Vector will increase production capacity to meet the rising market demand of today and tomorrow. The new furnace’s vertical configuration and rotary hearth were built specifically to accommodate more large dies, allowing the partner to meet the elevated demand with ease. SECO/VACUUM’s intuitive process controls ensure greater heating uniformity than their existing equipment in both convection mode and in vacuum mode.

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