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Heat-treating furnaces
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Book Chapter
Inductor Construction
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 31 December 2024
DOI: 10.31399/asm.tb.hisppa.t56110035
EISBN: 978-1-62708-483-3
Abstract
This chapter presents guidelines that should be considered when designing inductor coils. It provides a detailed description of typical inductor coil shapes, including outer and inner field inductors, single-turn and multi-turn inductors, pancake inductors, hairpin inductors, double-hairpin inductors, channel or slot inductors, fork inductors, spoon inductors, powerline inductors, magnetic field concentrators, multiple inductors, folding inductors, and shielding gas inductors. The chapter provides an overview of inductor tube dimensions and inductor coil positioning. It also describes the design and fabrication of inductor coils.
Book Chapter
Control of Heat-Treating Processes
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380001
EISBN: 978-1-62708-456-7
Abstract
Critical process variables must be controlled to ensure uniform and repeatable heat-treating results. This chapter covers the subject of controlling the heat-treating process. All heat-treating equipment utilizes various sensors, timers, and other components to monitor and control the process utilizing various control methods. The chapter focuses on temperature control and measurement, including a discussion about thermocouples and devices for measuring thermal and electrical conductivity.
Book Chapter
Types of Heat Treating Furnaces
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380017
EISBN: 978-1-62708-456-7
Abstract
This chapter details the types of heat treating furnaces. It discusses energy sources and modes of heat transmission. The chapter’s focus is on the different types of batch furnaces and continuous furnaces, including box furnaces, integral-quench batch furnaces, pit furnaces, furnaces for heat treating with fluidized beds, and straight chamber continuous furnaces.
Book Chapter
Furnace Atmospheres
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380039
EISBN: 978-1-62708-456-7
Abstract
This chapter discusses furnace atmospheres. It describes how furnace atmospheres protect metals, transfer heat, and supply alloying elements (carbon and nitrogen). The chapter focuses on the different types of atmospheres that are available to the heat treater: combustion products, air, exothermic, salt, nitrogen, endothermic, ammonia, hydrogen, inert gas, and vacuum.
Book Chapter
Vacuum Furnace Processes
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380061
EISBN: 978-1-62708-456-7
Abstract
This chapter discusses vacuum furnace processes and their design. The chapter focuses on the pressure levels, heating elements, pumping systems, temperature control systems, and quenching systems in vacuum furnaces. It then details specific applications of vacuum heat treating.
Book Chapter
Problems Associated with Heat Treated Parts
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380191
EISBN: 978-1-62708-456-7
Abstract
This article introduces some of the general sources of heat treating problems with particular emphasis on problems caused by the actual heat treating process and the significant thermal and transformation stresses within a heat treated part. It addresses the design and material factors that cause a part to fail during heat treatment. The article discusses the problems associated with heating and furnaces, quenching media, quenching stresses, hardenability, tempering, carburizing, carbonitriding, and nitriding as well as potential stainless steel problems and problems associated with nonferrous heat treatments. The processes involved in cold working of certain ferrous and nonferrous alloys are also covered.
Book Chapter
Calculation of Heat Treating Costs
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380223
EISBN: 978-1-62708-456-7
Abstract
This article presents a simple cost/pricing system that is reasonably accurate and could easily be recalculated if the yearly cost of any of the basic cost components change. Using the example of a commercial heat treating facility, the operational details are categorized as atmosphere processes, induction processes, aluminum processes, high-heat processes, and secondary processes. For the purpose of calculating the heat treatment processing cost per hour and the selling price for a piece of equipment, the costs are separated into direct costs, allocated costs, capitalized cost, and general and administrative costs. The article discusses the techniques involved in allocating costs to the group of equipment, and presents a description on the cost analysis of endothermic gas.
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
Iron and Steel Melting Furnaces
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370115
EISBN: 978-1-62708-447-5
Abstract
The melting furnace is a critically important piece of equipment in a foundry; it influences the balance between the metal required by molding machines and the melting capacity. This chapter presents the features, types, advantages, and applications of furnaces suitable for iron and steels such as cupolas, induction furnaces, and arc furnaces.
Book Chapter
Aluminum Alloy Melting, Holding, and Dosing Furnaces
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370145
EISBN: 978-1-62708-447-5
Abstract
This chapter highlights the different melting, holding, and dosing furnaces that are available for the alternative casting processes used for the production of aluminum castings. Melting furnaces are grouped into four broad categories: crucible furnaces; reverberatory furnaces (or reverbs); stack melting furnaces (also called stack melters), tower melting furnaces, or jet melting furnaces; and electric coreless induction furnaces are detailed in this chapter. Factors influencing the choice of the melting, holding, and dozing equipment are presented. Equipment for recycling machined chips is also addressed.
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.9781627084475
EISBN: 978-1-62708-447-5
Book Chapter
Annealing of Metals and Normalizing of Steel
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310127
EISBN: 978-1-62708-326-3
Abstract
This chapter describes the general characteristics of major types of steel annealing, including the process of normalization, which is a process that refines or normalizes the microstructure of steel. The first part of the chapter begins with an overview of the three-stage process of recovery, recrystallization, and grain growth. This is followed by discussions on annealing processes, namely subcritical annealing, critical-range annealing, full annealing, isothermal annealing, annealing for microstructure, and solution or quench annealing. Next, the chapter describes two undesirable reactions that occur during annealing: decarburization and scaling. Information on the gases and gas mixtures used for controlled atmospheres is then provided. The second part of the chapter focuses on the processes involved in normalizing, along with information on furnace equipment for normalizing. In addition, the chapter includes information on processes involved in induction heating of steel.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.9781627083119
EISBN: 978-1-62708-311-9
Book Chapter
Heat Treatment of Steel
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
Abstract
This chapter discusses the types, methods, and advantages of heat treating procedures, including annealing, normalizing, tempering, and case hardening. It describes the iron-carbon system, the formation of equilibrium and metastable phases, and the effect of alloy elements 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, and the use of cold treating.
Book Chapter
Coal-Fired Boilers
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
Abstract
This chapter discusses material-related problems associated with coal-fired burners. It explains how high temperatures affect heat-absorbing surfaces in furnace combustion areas and in the convection pass of superheaters and reheaters. It describes how low-NOx combustion technology, intended to reduce NOx emissions, accelerates tube wall wastage. It also covers circumferential cracking in furnace waterwalls, thermal fatigue cracking induced by waterlances and water cannons, superheater-reheater corrosion, and erosion in fluidized-bed boilers.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.9781627083041
EISBN: 978-1-62708-304-1
Book Chapter
Sintering and Corrosion Resistance
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000059
EISBN: 978-1-62708-312-6
Abstract
This chapter discusses the sintering process for stainless steel powders and its influence on corrosion resistance. It begins with a review of sintering furnaces and atmospheres and the effect of temperature and density on compact properties such as conductivity, ductility, and strength. It then describes the relationship between sintered density and corrosion resistance and how it varies for different types of powders and operating environments. The chapter also explains how stainless steel powders respond to different sintering atmospheres, including hydrogen, hydrogen-nitrogen, and vacuum, and liquid-phase sintering processes.
Book Chapter
Machinery and Equipment for Direct and Indirect Hot Extrusion
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980323
EISBN: 978-1-62708-342-3
Abstract
The machinery and equipment required for rod and tube extrusion is determined by the specific extrusion process. This chapter provides a detailed description of the design requirements and principles of machinery and equipment for direct and indirect hot extrusion. It then covers the presses and auxiliary equipment for tube extrusion, induction furnaces for billet processing, handling systems for copper and aluminum alloy products, extrusion cooling systems, and age-hardening ovens. Next, the chapter describes the principles and applications of equipment for the production of aluminum and copper billets. Then, it focuses on process control in both direct and indirect hot extrusion of aluminum alloys without lubrication. The chapter describes the technology of electrical and electronic controls in the extrusion process. It ends with a discussion on the factors that influence the productivity and quality of the products in the extrusion process and methods for process optimization.
Book Chapter
Furnaces and Related Equipment for Heat Treating
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
Abstract
This chapter, a detailed account of furnaces and related equipment for heat treating, begins by describing three basic modes of heat transmission, namely conduction, convection, and radiation, followed by a discussion on the working principle, applications, advantages, and disadvantages of furnaces classified based on the heat transfer medium employed. The types of furnaces covered are batch-type, continuous-type, liquid bath, fluidized bed, and vacuum. The subsequent sections provide information on furnace parts, fixtures, quenching mediums, and quenching systems. The final section of the chapter describes the types of atmospheres available, emphasizing their applications and limitations.
Book Chapter
Furnace Equipment and Control Systems
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900039
EISBN: 978-1-62708-350-8
Abstract
This chapter provides a discussion of nitriding furnace equipment and control systems. The discussion covers the essential design criteria of the furnace, types of nitriding furnaces, insulation for the reduction of furnace heat losses, and factors influencing furnace configuration and design. It also covers the processes involved in the construction and maintenance of retorts, methods for sealing a retort to prevent ammonia leaks, and safety precautions to be taken while using ammonia. Further, the chapter provides information on the factors for choosing a heating medium and discusses the processes involved in controlling temperature, gas dissociation, oxygen probes, and nitriding sensors.
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