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ceramic-lined salt bath furnaces

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900109
EISBN: 978-1-62708-358-4
... Abstract Furnaces for heat treatment of tool steels include ceramic-lined salt bath furnaces, vacuum furnaces, controlled-atmosphere furnaces, and fluidized-bed furnaces. This chapter describes the classification, operating principles, application, advantages, and disadvantages of each type...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380017
EISBN: 978-1-62708-456-7
... furnaces, 60% of the energy goes for heating and the remaining 40% is released up the furnace stack as waste. Steels that are heat treated in molten salts are typically processed in ceramic-lined furnaces with submerged or immersed electrodes containing chloride-based salts. Advantages of Salt-Bath Heat...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900231
EISBN: 978-1-62708-350-8
... cost of the process bath equipment. Fig. 1 Internally heated salt bath furnace with immersed alloy electrodes and ceramic tile lining Fig. 2 Internally heated salt bath furnace with submerged graphite electrodes and a modified brick lining for use with carburizing salts Atmosphere...
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Published: 01 December 2003
Fig. 1 Internally heated salt bath furnace with immersed alloy electrodes and ceramic tile lining More
Image
Published: 01 December 2003
Fig. 1 Principal furnace types for liquid salt bath nitriding. (a) and (b) Externally heated. (c) and (d) Internally heated, with immersed alloy electrodes and metal liner or submerged electrodes with ceramic tile lining More
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
... bath. The chapter explains the procedures for maintenance of the salt bath and related equipment. It also discusses safety precautions and design parameters for furnace equipment. furnace equipment maintenance safety precautions salt bath nitriding sodium carbonate sodium cyanate titration...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
... electrodes shown in Fig. 7c ) is that the electrodes deteriorate just above the salt line where the heat is intense. The submerged electrode type overcomes this disadvantage; however, the submerged type furnace requires a molded-in ceramic type of pot, and ceramic pots are not compatible with all salt...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380039
EISBN: 978-1-62708-456-7
... cover is used at higher temperatures, there is still a possibility of carburizing parts. Fig. 3.7 Salt-bath furnace used for neutral heating applications. Furnace features a ceramic pot and over-the-top (immersed) electrodes. Source: Ref 1 Some heat treating shops test...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370145
EISBN: 978-1-62708-447-5
... or electric with radiant electrodes. Gas-fired reverbs are classified as wet-well (also called wet-bath) or dry-hearth . The bottom of the wet-well furnace is shaped to partially submerge the charged ingots, sows, or T-bars in the liquid metal bath. As the charge melts, ingots, sows, or T-bars move down...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240395
EISBN: 978-1-62708-251-8
... Liquid 815–980 1500–1800 50–1525 2–60 50–65 Low-carbon steels, low-carbon alloy steels Faster than pack and gas processes; can pose salt disposal problem; salt baths require frequent maintenance Vacuum 815–1095 1500–2000 75–1525 3–60 50–63 Low-carbon steels, low-carbon alloy steels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
... on hardenability and tempering response. It discusses the significance of critical temperatures, the use of transformation diagrams, and types of annealing treatments. It also provides information on heat treating furnaces, the effect of heating rate on transformation temperatures, quench and temper procedures...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310163
EISBN: 978-1-62708-326-3
... salt baths are also used for the heating and as a quench medium for hardening steel. For low volume or hardening individual pieces, parts may be coated with borax; packed in an alloy box with dry, cast iron chips; or wrapped in 310 stainless steel foil before austenitizing. Each of these options causes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350125
EISBN: 978-1-62708-315-7
... described in this chapter are those that involve an intentional buildup or addition of a new layer on a metal substrate, that is, the application of a coating or lining. A wide range of processes are used to deposit metal, ceramic, and organic (paints or plastic and rubber linings) coatings or combinations...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740271
EISBN: 978-1-62708-308-9
... bainite, which forms at lower temperatures. Finally, if the specimens are quenched in a salt bath to 150 °C (300 °F), another new constituent, called martensite, forms. Martensite is quite different from both pearlite and bainite. It is not a mixture of ferrite and cementite. Instead, martensite...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380235
EISBN: 978-1-62708-456-7
..., the bar diameter that has 50% martensite at the center of the bar when the surface is cooled at an in nitely rapid rate (that is, when H = 1, where H is the quench severity factor). immersed-electrode furnaces A furnace used for liquid carburizing of parts by heating molten salt baths with the use...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.9781627084567
EISBN: 978-1-62708-456-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770037
EISBN: 978-1-62708-337-9
... Surface content, % (atmosphere) Fatigue strength (σ - 1), MPa Bend strength (σ bend), MPa Normalized (a) 1.04 (not normalized) 80 319 0.8 (gas furnace) 81 355 <0.8 (nitrate salt) 77 318 0.6 (chloride bath, 20 min) 60 407 0.35% (chloride bath, 160 min) 39 318...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740325
EISBN: 978-1-62708-308-9
... paint adhesion. A detergent-bearing iron phosphating solution is often ideal for this sort of combined cleaning and etching approach. Molten Salt Bath Cleaning Molten salt bath cleaning is very effective for removing many soils, especially paints and heavy scale. However, the very high operating...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310285
EISBN: 978-1-62708-326-3
.... (b) For 0.25 Si type, 183 to 207 HB; for 1.00 Si type, 207 to 229 HB. (c) Temperature varies with carbon content: 0.60 t 0.90 C, 740 to 790 °C (1360 to 1450 °F); 0.90 to 1.40 C, 760 to 790 °C (1400 to 1450 °F). Atmosphere furnaces, salt baths, vacuum furnaces, or lead pots may be used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230105
EISBN: 978-1-62708-351-5
.... Attempts to do so tend to cause volatilization of some of the lead and contamination of the furnace lining and furniture with a material classified as hazardous! 3.1 Joining Atmospheres Many types of assembly demand brazing under a protective atmosphere, including assemblies intended for service...