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gas-fired furnaces

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Published: 01 November 2010
Fig. 9 Gas-fired furnace and its flow pattern. Source: Ref 7 More
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001269
EISBN: 978-1-62708-170-2
... is then rinsed and dried. After this wet section of the process, the strip enters an unfired, or waste gas, preheater before entering a high-gradient, direct-fired furnace. Finally, it enters a high-temperature, radiant-tube, reducing/annealing furnace with a hydrogen-nitrogen atmosphere. Fig. 1 Schematic...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005957
EISBN: 978-1-62708-166-5
... (indirect heating, e.g., radiant burner tube, radiant panel, muffle). In indirect-fired furnaces, the working chamber is fed with a separately generated atmosphere. Two of the most common types of atmosphere generators are exothermic and endothermic generators. Exothermic generators combust gas using...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005926
EISBN: 978-1-62708-166-5
...-ammonia-based atmospheres, industrial gas nitrogen-base atmospheres, argon atmospheres, and hydrogen atmospheres. Atmospheres for backfilling, partial pressure operation, and quenching in vacuum are also discussed. Furnace atmospheres constitute four major groups of safety hazards in heat treating: fire...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005350
EISBN: 978-1-62708-187-0
... electric or gas-fired vessels of just a few tons volume to upward of 40 to 50 tons. Secondary smelters that produce ingot or supply liquid metal to foundries operate even larger furnaces. Gas reverberatory furnaces are commonly used in large nonferrous casting foundries because they provide a large...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006254
EISBN: 978-1-62708-169-6
...% sulfur hexafluoride in carbon dioxide will prevent active burning above 600 °C (1110 °F). Sulfur dioxide is available bottled, whereas carbon dioxide may be obtained either bottled or as the product of recirculated combustion gases from a gas-fired furnace. A concentration of 0.7% (0.5% min) sulfur...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005908
EISBN: 978-1-62708-167-2
... Melting furnaces are widely used for the melting of iron, steel, and nonferrous metals. In cast iron foundries, cupola, induction, and also partly gas- or oil-fired rotary furnaces are in competition ( Fig. 2 ). From the aspect of production requirements, the cupola furnace has big advantages...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005529
EISBN: 978-1-62708-197-9
... fired. Generally, the gaseous fuel is natural gas, propane, a propane-air mix, or a relatively low-energy manufactured gas. The flue gases can be controlled or varied by adjusting the fuel-air ratio of the combustion system. Figure 9 shows a gas-fired pit furnace ( Ref 7 ), where Fig. 9...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005905
EISBN: 978-1-62708-167-2
.... Compared to gas-fired furnaces, the process engineering benefits of induction furnaces are offset by the drawbacks of the generally higher costs of electricity and also often higher investment costs. Therefore, induction furnaces are deployed when lower rates of metal losses, greater flexibility, stringent...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003994
EISBN: 978-1-62708-185-6
... atmosphere at 1040 °C (1900 °F). The resulting coating is about 0.05 to 0.1 mm (2 to 4 mils) thick and provides protection from atmospheric contamination at temperatures to 1425 °C (2600 °F). Glass coatings can also be applied to the workpiece before heating in a gas-fired furnace. Molybdenum...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006137
EISBN: 978-1-62708-175-7
... with producing and using common sintering atmosphere gases are explosion, fire, toxicity, and asphyxiation. atmosphere supply systems inspection maintenance safety and environmental concerns sintering atmosphere generators sintering atmospheres SINTERING ATMOSPHERES (endothermic gas, exothermic...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004156
EISBN: 978-1-62708-184-9
... corrosion in the lower furnace and fuel ash corrosion of superheaters and reheaters in the upper furnace). Different corrosion mechanisms operate on these tube surfaces, as dictated by the local chemistry of combustion gases and deposits, the boiler tube compositions, and the gas and metal temperatures...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005834
EISBN: 978-1-62708-167-2
...) with repeatable quality. Induction heating is also more energy efficient and inherently more environmentally friendly than most other heat sources including gas fired furnaces, salt and lead baths, carburizing systems, and nitriding systems ( Ref 1 ). Other advantages of induction heating include...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003199
EISBN: 978-1-62708-199-3
... The main fuel supply for fuel-fired heat-treating furnaces normally is natural gas, propane-air, propane, butane, or one of the fuel oils. The main gas valve may be of the manual-reset type, requiring an operator, or may be fully automatic. For furnaces with capacities greater than 422 MJ/h (400,000...
Image
Published: 01 January 1993
–20 (a) Gas fired, 1.8 m (72 in.) diameter, 1.8 m (72 in.) deep. (b) 610 mm (24 in.) diameter and length. (c) Holding fixture, to keep assembly upright (forging down) during brazing. (d) Incoming. (e) Exhaust. (f) 1 mm (0.040 in.) diameter wire More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003198
EISBN: 978-1-62708-199-3
... is well adapted to heat treatment of tool steels, as well as to treatment of nonferrous alloys. Advantages of using salt bath equipment include thermal control and rapid heating rates. Externally Heated Furnaces Externally heated salt bath furnaces may be fired by gas or oil, or heated by means...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001279
EISBN: 978-1-62708-170-2
... the quality of enameled surfaces. aluminum cast iron coating thickness color enamel frits firing time furnaces glass coatings metal substrate metal surface porcelain enamelling process control quality control steel selection steels PORCELAIN ENAMELS are glass coatings applied...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005943
EISBN: 978-1-62708-166-5
..., carbonitriding, harden and temper, atmosphere annealing, and carbon restoration. Sales and usage data were recorded for similar classes of these furnaces. Overall atmosphere work accounted for approximately 52% of overall sales. All furnaces were gas fired except for the pusher, which was electrically heated...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006528
EISBN: 978-1-62708-207-5
... aluminum is not dried; the wet coated metal goes directly into the furnace. Furnaces Forced convection is the preferred method of heating furnaces for firing porcelain enamel on aluminum. The heat can be provided by electric-package heaters, quartz-tube electric heaters, or metal-sheath heaters, all...
Image
Published: 01 January 2005
) Heating furnace Gas-fired, automatic temperature control Heating temperature 1230 °C (2250 °F) (a) Forging machine 18 kN (4000 lb) steam hammer (a) Forging was completed in one heat. More