One Minute Mentor: Process Control in Nitriding Systems

Modern gas nitriding and nitrocarburizing furnaces are equipped with sensor systems and a process control unit that allow the measurement and automatic control of the nitriding potential (KN). The figure shows an example of how the process control can be carried out. 

Defined amounts of ammonia, nitrogen, and—for nitrocarburizing processes—carbon dioxide, can be chosen for each step in the program and fed into the furnace via mass flow controllers. The gas composition in the retort is measured via a nitriding probe. For the measurement of nitrocarburizing processes two different probes are needed. The control unit calculates the nitriding potential according to the measured values and controls the mass flow of ammonia to meet the requested set point of KN. During the nitriding process the gasifying amount of ammonia can just be reduced to a certain limit. To keep the KN value low, therefore, precracked ammonia must be added. It must be mentioned that there are some more simple control systems available, which also produce good results.

For more information, click on the link below (subscription required). Then scroll to Figure 25. R Schneider; R. Mesquita; W Schützenhöfer, Distortion in Tool Steels, ASM International, 2014  https://doi.org/10.31399/asm.hb.v04d.a0005958

Preparation and high-temperature oxidation resistance of zirconium alloys

Researchers from the National Engineering Research Center for Instrument Functional Materials and Chongqing University, both in Chongqing, China, have highlighted the pivotal role of zirconium alloys in nuclear power systems. Their latest paper reviews the significant advancements in coating technologies for zirconium alloy fuel cladding, a crucial component in nuclear reactors. The study discusses various preparation methods, types of coatings, and their efficacy in resisting high-temperature oxidation—a key challenge for fuel cladding materials. This comprehensive review aims to serve as a critical reference in advancing the surface coating technology of fuel cladding zirconium alloys, promising enhanced performance and safety in nuclear power applications.

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Can-Eng announces expansion with subsidiary Evergreen Kiln Technologies

EvergreenKilnTechnologies, LLC, based in Niagara Falls, USA, together with Suzhou Kilnpartner Mechanical Technology Co., Ltd., based in China, have announced a strategic partnership aimed at addressing the burgeoning needs of the North American Lithium-ion battery market. This alliance is poised to offer battery material producers advanced Kiln System solutions tailored for the production of cathode (LFP, NMC) and anode active materials.

As part of the arrangement, EvergreenKilnTechnologies LLC will function as a subsidiary under Can-Eng Furnaces International LTD., leveraging Can-Eng’s extensive 60-year expertise in designing and developing bespoke thermal processing systems.

The partnership extends across various domains, including marketing, brand collaboration, technology development, production, engineering, and after-sales services. The primary objective is to innovate thermal processing methods for battery powders, ensuring that the collaborative venture can deliver superior kiln solutions to clients across North America.

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Seco/Vacuum awarded nine-furnace contract

Seco/Vacuum, Meadville, Pa., announced it has secured a record-breaking contract for nine furnaces in June. The order includes three Vector vacuum Furnaces and six tempering furnaces, along with necessary auxiliary systems, marking a significant expansion for a returning heat-treat partner that already operates twelve Seco/Vacuum furnaces across North America.

The new furnaces are part of the heat-treater’s strategic shift from atmospheric heat treatment to vacuum processes. This transition aims to modernize their facilities, offering cleaner, safer, and more cost-effective operations. Vacuum processes also allow for finer control and reduce the carbon footprint, aligning with contemporary environmental standards.

The Vector® furnaces, known for their versatility in heat-treating processes like hardening, tempering, and brazing, will primarily be used for hardening due to their high-pressure gas quench capabilities. These furnaces ensure high uniformity and consistency in heat-treated parts, with enhanced batch processing speed and reduced energy and gas usage.

The accompanying Tempering Furnaces, designed for efficient atmospheric tempering, feature convection heating for faster process temperatures and smoother workflow integration, crucial during the often-congested tempering stage.

To support the intensive hardening cycles of the Vectors, six tempering furnaces were chosen to maximize throughput and efficiency. Each furnace, both vectors and temperers, are front-loading with a capacity of 3,300 lbs and dimensions of 36 x 36 x 48 inches.

The full modernization will require a temporary shutdown of existing operations. Seco/Vacuum will mitigate downtime by also acting as the general contractor, overseeing the installation of furnaces, systems, and necessary infrastructure, ensuring a swift resumption of operations with new capabilities.

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Steel Dynamics announces leadership appointments

Steel Dynamics Inc., Fort Wayne, Ind., announced leadership appointments for James Anderson and Chad Bickford. Mark D. Millett, Chairman and CEO, expressed his excitement, praising their leadership qualities and positive influence within the company. Millett highlighted their commitment to the company’s core values of safety, performance, and innovation, and their focus on prioritizing personnel.

James Anderson has been named Senior Vice President of the Long Products Steel Group, effective May 1, 2024. Anderson, who will report to Barry Schneider, President and COO, brings a wealth of experience from his previous roles, including leading the Steel Fabrication business and serving as COO of New Millennium Building Systems. His new role will see him overseeing operations that include four EAF long product steel mills and various smaller facilities, together capable of shipping nearly five million tons of steel annually.

Chad Bickford will take over Anderson’s former position as Vice President of the Steel Fabrication Group, New Millennium Building Systems. Bickford, who also reports to Schneider, transitions from his recent role managing the Butler Flat Roll Steel Division. His extensive background in steel fabrication operations and leadership, including a stint as General Manager at the Virginia steel fabrication facility, prepares him well for his new responsibilities overseeing seven manufacturing facilities across the U.S. and Mexico.

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