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salt bath ferritic nitrocarburizing

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900201
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter provides a detailed discussion of salt bath nitrocarburizing. Process variations discussed include low-cyanide salt bath ferritic nitrocarburizing, salt bath nitrocarburizing plus post treatment, and the Kolene Nu-Tride process. salt bath ferritic...
Image
Published: 01 December 2003
Fig. 1 Precleaning methods for gas and salt bath ferritic nitrocarburizing More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900241
EISBN: 978-1-62708-350-8
... of the case surface Difficulty in controlling the gas decomposition Various surface cleaning methods can be used ( Fig. 1 ). Some of the more commonly used methods are discussed below. Fig. 1 Precleaning methods for gas and salt bath ferritic nitrocarburizing Wash Units Wash units...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900231
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter discusses equipment used for ferritic nitrocarburizing, including salt bath furnaces, atmosphere furnaces, and plasma furnaces. It also describes the processes involved in ferritic oxynitrocarburizing. atmosphere furnaces ferritic nitrocarburizing plasma...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900219
EISBN: 978-1-62708-350-8
...Abstract Abstract Gaseous ferritic nitrocarburizing, like salt bath nitrocarburizing, involves the introduction of carbon and nitrogen into steel in order to produce a thin layer of iron carbonitride and nitrides, the "white layer" or compound layer, with an underlying diffusion zone containing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900193
EISBN: 978-1-62708-350-8
... and equipment. The early methods of ferritic nitrocarburizing were accomplished in low-temperature (550 °C, or 1020 °F) salt baths working on the principle of the decomposition of cyanide to cyanate (in the ferrite region). Imperial Chemical Industries in England pioneered the salt bath process, which...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900245
EISBN: 978-1-62708-350-8
... analyzer that measures the carbon monoxide, carbon dioxide, and hydrogen contents and adjusts the gas composition and flow rates accordingly. If using the salt bath method of ferritic nitrocarburizing, analyze the salt composition for cyanide and cyanate composition. If the resulting analysis shows...
Image
Published: 01 December 2003
Fig. 19 Microstructures of various ferritic materials that have undergone salt bath nitrocarburizing. All etched in 3% nital. All 500×. Courtesy of Kolene Corp. (a) Ferritic nodular iron; 90 min at 580 °C (1075 °F), oxidizing molten salt quench. (b) Low-carbon steel; 90 min at 580 °C (1075 °F More
Image
Published: 01 December 2003
Fig. 2 Typical time-temperature process cycle for a ferritic nitrocarburizing procedure using salt baths More
Image
Published: 01 December 2003
Fig. 1 Various trade names for gaseous, salt bath, and ion (plasma) ferritic nitrocarburizing processes. Fluidized-bed procedures also are available. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440141
EISBN: 978-1-62708-262-4
... obtained with aerated salt bath nitriding (sometimes called salt bath nitrocarburizing ). A natural advantage of the gas process is the elimination of the need for salt removal, waste treatment, and disposal. Ferritic nitrocarburizing treatments involve diffusion of both nitrogen and carbon...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440001
EISBN: 978-1-62708-262-4
..., and nitrocarburizing, is provided. annealing carbonitriding carburizing ferritic nitrocarburizing nitriding normalizing quenching steel stress relieving tempering THE GENERALLY ACCEPTED TERM for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in such a way so...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900053
EISBN: 978-1-62708-350-8
... on the immediate surface of the part ( Fig. 2 , 3 ). Fig. 2 Ferritic nodular iron, salt bath nitrided 90 min at 580 °C (1075 °F), oxidizing molten salt quenched. 500×, nital etch. Courtesy of Kolene Corp. Fig. 3 SAE 5115 (UNS G51150), chromium-manganese low-carbon steel, salt bath nitrided 90 min...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900185
EISBN: 978-1-62708-350-8
... and ensure reasonably repeatable nitriding conditions: process salt chemistry and bath cleanliness. Process Chemistry The subject of discussion here is salt bath nitriding and not ferritic nitrocarburizing. There is a great distinction between the two processes. It is important to understand...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140189
EISBN: 978-1-62708-264-8
..., the source of the nitrogen for nitriding can be either a gas or a cyanide salt bath. Also like nitrocarburizing, the process is done at temperatures below the eutectoid temperature, in this case, usually approximately 500 to 525 °C (930 to 980 °F). During the gas nitriding process, the nitrogen potential, r...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
...-centered cubic (bcc) lattice that is stable from below room temperature to 912 °C (1675 °F). This phase of bcc iron is known as α-ferrite. Another phase of iron is a face-centered cubic (fcc) lattice known as austenite or γ-iron, and occurs between 912 and 1394 °C (1675 and 2540 °F). Finally, another solid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900111
EISBN: 978-1-62708-350-8
... discussed gas nitriding, salt bath nitriding, and plasma ion nitriding. Each of these procedures is conducted at a process temperature of approximately 500 °C (930 °F). The fluidized-bed furnace uses ammonia gas for its nitrogen source, whereas the salt bath uses cyanide. Fluidized-bed nitriding is similar...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900153
EISBN: 978-1-62708-350-8
... chromium ranging from 2 to 12%, they are distinguished by their principal alloying element. All can be readily processed via gas nitriding, salt bath nitriding, or ion nitriding. Forging Dies Selection of a hot-work steel grade depends on the forge die application. For many forging steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900001
EISBN: 978-1-62708-350-8
... purpose. Salt Bath Nitriding Shortly after the development of gas nitriding, alternative methods of nitriding were sought. One such method was the use of molten salt as a nitrogen source. The salt bath process uses the principle of the decomposition of cyanide to cyanate and the liberation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
... case than carburizing, gas control critical Liquid (cyaniding) Diffused carbon and nitrogen 760–870 (1400–1600) 2.5–125 μm (0.1–5 mils) 50–65 (a) Low-carbon steels Good for thin cases on noncritical parts, batch process, salt disposal problems Ferritic nitrocarburizing Diffused carbon...