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I want to hear from you. Für die sorglose Wärmebehandlung bei Ihnen vor Ort. A most critical parameter is the composition, function and control of the furnace atmosphere. The advantage of this type of system is that it does not normally require a pit. Control System In addition, direct radiation is often undesirable due to the risk of overheating. Product Features Manufacture by the furnace body, the stainless steel crucible, multiple swinging material frame, stainless steel fast cold box, the heating unit and control the warm cabinet to be composed automatically. Gas nitriding allows for accurate control of both the process temperature and nitriding atmosphere (carbon potential). Tell me how we can improve. Because the compound layer can be brittle and could spall in service, it is desirable to minimize white-layer thickness. During the second stage, the temperature of the parts is either maintained or increased to 1025-1075°F and the ammonia dissociation rate is increased to 65-85%. Check out the November 8, 2020 issue of Industrial Heating, featuring the "Nadcap Heat-Treatment-Specific Guidance", "A Closer Look at NDT in Aerospace Applications", and much more. By visiting this website, certain cookies have already been set, which you may delete and block. 2. Pit furnaces are especially convenient for processing long parts hung vertically, heavy loads and long-cycle work. Cooling System The nitriding process is typically performed when increased surface hardness, wear and abrasion resistance, fatigue strength or corrosion resistance are required. A leak not only affects the nitride case but leads to potential safety concerns for the operators. The atmosphere must contain less than 50% of the LEL (lower explosion limit) before the furnace can be opened. Nitriding and nitrocarburizing can be accomplished in a wide range of batch-style furnaces, including pit, bell, box, integral-quench and tip-up. By visiting this website, certain cookies have already been set, which you may delete and block. Integral-Quench Furnaces Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. This type of furnace includes a cover that provides access for transferring workloads in baskets or loaded fixtures in and out of the unit using an overhead crane (Fig. 2). An atmosphere-tight work chamber is required since ammonia flows through the furnace. Case depth and required metallurgical properties In this case, the blower draws the atmosphere out of the furnace, through the heat exchanger and then forces the atmosphere back into the furnace. The vacuum-purge gas nitriding system is a batch-type unit designed for nitriding and ferritic nitrocarburizing processes. Pusher systems could include a washer, oxidation furnace, purge chamber, nitriding furnace, cooling zone, post-purge chamber and load/unload area. 2,437,249), which reduces the amount of white layer. 1. 11# Rd Jiutonglu, Dongxihu, Wuhan, Hubei, China. If it stands alone, the furnace could include alloy skid rails to allow transferring loads in and out via forklift truck. Gas Nitrocarburising This is a process for the enrichment of the surface with nitrogen and carbon at a temperature of 570 to 580 °C within a process time of 2 to 10h. ZeroFlow® – gas nitriding process Modern, energy-saving and ecological gas nitriding process used in HRN/VRN type furnaces. Visit our updated, Fig. With either method, the heat source (gas burners or electric elements) must be isolated from exposure from the processing gas. Positioning the fan in the cover provides easier access for maintenance. This led to the development of the two-stage, or Floe, process named after its inventor, Dr. Carl Floe (U.S. Patent No. This configuration enables unloading and loading one chamber while the other retort is in the pit furnace. Continuous systems tend to be expensive from a capital cost and installation standpoint and are less flexible than batch equipment. The PLC then adjusts the electronic flowmeters to maintain a specific nitriding potential. Fiber insulation also in combination with meander shaped heating for short heating times. Fig. Since gas nitriding is accomplished in the convection temperature range, fans are required to circulate not only the nitriding processing gases but also to uniformly transfer the energy from the heat source to the workload. AMS 2759/10 defines nitriding potential range for various materials (4140, 4340, H11, etc.) The result is a part with increased surface hardness, wear and corrosion resistance, anti-galling properties and improved fatigue strength. Annealing with inert gas/Vacuum Hardening. At the same time, it provides flexibility to run different recipes for each workload. The nitrogen activity is controlled by the degree of ammonia dissociation and the ammonia flow rate. A forklift truck can be used to transfer loads in and out of the furnace. The addition of circulation baffles and diffusers provides a defined flow throughout the work area. Please join us as we discuss the basics of grinding and polishing sample materials. Gas Nitriding Furnaces are provided for temperature ranges from 150ºC to 700ºC. Pit furnace line with removable retort, Fig. The placement (above load, below load or in separate heating chamber) is dependent on the type of furnace and load configuration. Something went wrong while submitting the form. This information is used to help determine the load size, work-chamber size, equipment type and number of pieces of equipment. After mechanical preparation, the sample should be scratch-free, free from deformation, and ready for the microscope or hardness tester! High surface hardness and minimal distortion. Batch equipment is available in many configurations, including pit, bell, box and tip-up furnaces. National Fire Protection Agency (NFPA) 86 “Standard for Ovens and Furnaces,” requires that the oxygen be less than 1% prior to admission of ammonia. The result is uniform case depth throughout a workload. The Gas Nitriding Furnace is a batch furnace used for ammonia based processes. High-volume components are often run in continuous systems with lower per-unit cost. Circulation The furnace using ultra-energy structure, the industry's advanced of high-purity ceramic fiber insulation. In extreme cases or under the wrong circumstances violent explosions can also occur. View Furnace. The presence of large amounts of raw ammonia (over about 50 ppm) can lead to irritation of the eyes, shortness of breath and other physiological symptoms. In most cases, a retort is located within a furnace. By closing this message or continuing to use our site, you agree to the use of cookies. Control of the dissociation rate or nitriding potential can be accomplished using either dissociated ammonia (75% hydrogen, 25% nitrogen) or 100% nitrogen. During single-stage nitriding, a load of parts is maintained at 925-975°F in an atmosphere controlled at an ammonia dissociation rate of 15-30%. Circulating fans are located in the cover or bottom of the furnace. 7. 1). However, it does require quite a bit more ceiling height than a pit furnace. (in German). Pit. tel: 630-834-3017; e-mail: dherring@heat-treat-doctor.com; web: www.heat-treat-doctor.com, Patrick Weymer is with J.L. Another type of cooling system available for retort furnaces includes a blower that forces air through the cavity outside the retort. All Rights Reserved BNP Media. NFPA 86 also requires that combustible gas be purged out of a furnace at the end of a cycle. IH For webinar sponsorship information, visit www.bnpevents.com/webinars or email webinars@bnpmedia.com. Programmable logic controllers (PLCs) use the process-value data measured by electronic process-gas flowmeters, a pressure transducer and hydrogen analyzer to calculate the nitriding potential. To increase throughput, a system sometimes includes two removable retorts and two cooling stands. In some instances, the retort is pulled, and an external cooling stand and blower arrangement are employed.

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