The nitriding process begins at the surface of the part with the formation of a compound (aka white) layer, which depends to a large extent on the composition of the steel (in particular, the carbon content).
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.
FA Krosno completed the installation of a Nitrex nitriding system at its manufacturing facility in southeastern Poland. The pit-type system has overall chamber dimensions of 86 inches (2,184 mm) in diameter x 136 inches (3,452 mm) high with a capacity to nitride an 8,400-pound (3,800-kg) load. The delivered solution includes Nitreg and ONC technologies. ONC is a post-nitriding oxidation process that further enhances the quality of the nitride layer, provides additional corrosion protection and similarly contributes to the aesthetic finish of piston rods. The system, which started production in December 2019, replaced a defunct gas nitrider that was phased out due to inconsistent results and high scrap losses.
Nitrex Metal entered into an exclusive agreement with Voestalpine AG to bring new innovations in stainless steel hardening technologies to the Czech Republic. As a result of the agreement, Voestalpine added a nitriding system configured to process workloads 31.5 inches in diameter x 78.75 inches high (800 mm x 2,000 mm) that weigh up to 3,850 pounds (1,750 kg). The system complements a previously installed Nitrex system that combined Nitreg-C gas nitrocarburizing technology with ONC post-oxidizing technology for processing firearms.
Just as we’ve done in the past with other topics, Industrial Heating will take a look at the most-viewed Vacuum/Surface Treating articles (in terms of page views) on our website. Data was collected for 12 months, from August 2018 to August 2019.
The surface treatment of H13 hot-work tool steel for extrusion and forging dies is a technique that has been practiced for many years to extend the performance of the die surface. Many different methods of surface treatment have been tried with varying degrees of success.
Nitrex Metal Inc. supplied a nitriding system to Hydro Extruded Solutions in Trzcianka, Poland, to address the company’s need for improved process performance and more accurate control of nitriding results. The nitriding system replaces a decommissioned nitrider that was phased out several years ago due to extrusion die failures and inconsistent metallurgical results. It includes Nitreg technology that helps optimize parameters for maximum efficiency and quality and increase die strength and extrusion throughput while reducing the possibility of potential die failures.
Check out the April 2020 issue of Industrial Heating, which features our cover story on "CF Lining Attachment Advances", "Heat-Treatment Influence on Recast-Layer Thickness from Nonconventional Machining", "Hot Isostatic Pressing with Integrated Heat Treatment", and much more.