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Topic: Heat treatment

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	Heat Treatment of Steel
		Heat treatment H or D may be employed, the former being simpler.
		When heat treatment E is applied, machining may follow the second operation or the slow cooling after heating to from 1500 degrees to 1550 degrees F. To obtain the most strength, a quenching medium like brine should be used.
		Heat treatment G should be followed unless the steel is used for structural parts, when heat treatment M is applied.
	www.zianet.com /ebear/metal/heattreat7.html (5322 words)

	Heat Treatment
		The term heat-treatment embraces many processes employing combinations of heating and cooling operations, applied to moulds and dies, tools and machine components so as to produce desired mechanical properties, with attendant characteristics related to particular types of 'in-service' applications.
		If a steel bar is heated, it is found that at a specific temperature, which differs with each class of steel, important structural alterations begin to take place in it.
		By using induction heating of proper frequency, it is possible in a very short interval to form austenite in the surface.
	rpdrc.ic.polyu.edu.hk /content/hot_metal_process/heat_treatment1.htm (2529 words)

	Heat treatment Summary
		Heat treatments should not be used on individuals with circulation problems, heat intolerance, or lack of sensation in the affected area.
		Heat treatment provides an efficient way to manipulate the properties of the metal by controlling rate of diffusion, and the rate of cooling within the microstructure.
		Case hardening is a type of quenching heat treatment in which the surface of a part is heated (either with a flame or inductive heating) and then quenched.
	www.bookrags.com /Heat_treatment (1409 words)

	4. Heat Treatment Technology Description
		The development of heat treatment technologies for use in the battle against the zebra mussel, Dreissena polymorpha, was developed during the late 1980’s and subsequently led to the testing of heat treatment applications to ballast water.
		Heat moves across the plates (across the thermal gradient), lowers the temperature of the hot liquid, and raises the temperature of the cold liquid.
		The effectiveness of the heat transfer depends on the thermal gradient, which equates to the temperature and amount of heated liquid (i.e., water) or steam that is circulated through the hot side of the exchanger, as well as the temperature and amount of cold liquid circulated through the other side (Figure 4-2).
	www.nemw.org /Balsurv4_Heat.htm (4145 words)

	U.S. EPA: Heat Treatments for Quarantine Commodities
		Heat treatment technologies are currently a relatively simple, non-chemical alternative to methyl bromide that can kill quarantine pests (insects and fungi) in perishable commodities, as well as control some postharvest diseases.
		Vapor Heat: Vapor-heat quarantine treatment uses heated air saturated with water vapor to heat perishable food commodities to a specified temperature and holds that temperature for a specified period to ensure that all pests (such as tephritid fruit fly immatures) within the commodity are killed (APHIS 1993, Hallman 1990, Hallman et al.
		Although the total costs for perishable commodity treatments with heat are seven times greater than that with methyl bromide on a per tonne commodity basis, the relative proportion of this cost is small when compared to the value of the commodity.
	www.epa.gov /spdpublc/mbr/casestudies/volume2/heatcom2.html (2822 words)

	Stainless Steel - Heat Treatment
		Stainless steels are often heat treated; the nature of this treatment depends on the type of stainless steel and the reason for the treatment.
		These treatments, which include annealing, hardening and stress relieving, restore desirable properties such as corrosion resistance and ductility to metal altered by prior fabrication operations or produce hard structures able to withstand high stresses or abrasion in service.
		Heat treatment is often performed in controlled atmospheres to prevent surface scaling, or less commonly carburisation or decarburisation.
	www.azom.com /details.asp?ArticleID=1141 (1501 words)

	American Red Cross- Heat Wave
		Heat index: A number in degrees Fahrenheit (F) that tells how h ot it really feels when relative humidity is added to the actual air temperature.
		Heat cramps: Heat cramps are muscular pains and spasms due to heavy exertion.
		Although heat cramps are the least severe, they are often the first signal that the body is having trouble with the heat.
	www.redcross.org /services/disaster/keepsafe/heat.html (2375 words)

	Heat Treatment Of Aluminum
		Heat treatment of aluminum alloys is done for the purpose of making them more like pure aluminum, which is light, lustrous, and corrosion-resistant.
		The alloy is heated to a much lower temperature than in solution heat treatment of aluminum, but it is maintained at its temperature for a much longer period of time.
		And instead of quenching the material immediately after heating, as in the solution heat treatment of aluminum process, it is cooled gradually in stages at specified temperatures.
	www.avcorp.com /heat-treatment-of-aluminum.asp (336 words)

	Heat Treatment
		It is considered a natural type of treatment since the process is basically a continuation of the processes that occur in the ground.
		The stone is heated to a very high temperature, which causes the inclusions (ref. Why Gemstones Have Color in Colored Gemstones 101) to reform themselves and improve the color by making either darker, lighter, more intense, or of a different color.
		Sometimes, as in the case of ruby, the stone is heated almost to a point of melting, which lets the aluminum oxide in the stone reform to what is basically a new crystal structure.
	www.yourgemologist.com /heattreatment.html (768 words)

	Heat Treatment Services, Heat Treatment procedures, Industrial heat treatment services
		Heat Treatment is the controlled heating and cooling of metals to alter their physical and mechanical properties without changing the product shape.
		We did heat treatment of simple material like CS, MS, and also critical material like P9, P11, P22, P91 etc. We are capable of doing heat treatment of jobs having diameter as big as 16500 mm and as small as 12.5 mm thickness ranging from 240mm to 4 mm.
		Heat Treatment is often associated with increasing the strength of material, but it can also be used to alter certain manufacturability objectives such as improve machining, improve formability and restore ductility after a cold working operation.
	www.industrial-inspection.in /heat_treatment_services.htm (514 words)

	Heat Treatments: Introduction
		Heat treatment is sometimes done inadvertently due to manufacturing processes that either heat or cool the metal such as welding or forming.
		Otherwise the surface of the part has to be Carbon enriched using some diffusion treatment hardening techniques.
		Material Modification: Heat treatment is used to modify properties of materials in addition to hardening and softening.
	www.efunda.com /processes/heat_treat/introduction/heat_treatments.cfm (325 words)

	History of heat treatment of ruby & sapphire
		The history of gem treatments is as old as the gem trade itself.
		Another early work mentioning gem treatments is that of an anonymous Egyptian whose writings have survived in the form of two papyri believed to date from the third or fourth centuries AD (Nassau, 1984).
		The reference to rubies sometimes cracking from heat treatment may refer to the explosion of CO inclusions, which are common in Sri Lankan corundums.
	www.ruby-sapphire.com /brief-history-heat.htm (1798 words)

	Heat Treatment \| BOC Gases
		They provide a protective atmosphere whilst metal components are heated to a temperature less than transformation temperature, held to allow internal stresses to relax, and then slowly cooled.
		Cold Treatment – we supply liquid nitrogen as a coolant and a blanketing atmosphere in cold treatment of steel components to modify microstructure and achieve high wear resistance.
		Heat Treatment – total solutions for heat treatment contractors producing specialised components for automotive, defence, aerospace and electrical industries.
	www.boc-gases.com /products_and_services/by_process/heat_treatment.asp (753 words)

	ACS :: Heat Therapy
		Heat therapy involves exposing part or all of the body to high temperatures, usually to enhance other forms of therapy (eg, radiation and chemotherapy).
		The area may be heated externally, with high-frequency waves, or internally using one of several types of sterile probes (thin, heated wires or hollow tubes filled with warm implanted microwave antennae) and radiofrequency electrodes.
		Heat should also be used with caution in people who have anemia, heart disease, diabetes, seizure disorders, and tuberculosis, as well as women who are pregnant, and people who are sensitive to the effects of heat.
	www.cancer.org /docroot/eto/content/eto_5_3X_heat_therapy.asp?sitearea=ETO (1141 words)

	Tools Steels - Heat Treatment of Tool Steels Including Tempering, Normalising, Annealing, Stress Rel
		Subcontract heat treatment should only be given to reliable heat treaters with experience and the right equipment to ensure that optimum results are obtained.
		The purpose of this type of heat treatment is to grain refine and to ensure that the micro constituents are evenly dispersed throughout the steel as excessive segregation can lead to distortion due to differential hardening rates and cracking.
		The normalising heat treatment cycle involves heating slowly and carefully to the normalising temperature for that particular steel, holding at temperature sufficient to allow homogenisation to occur and then air cooling to room temperature.
	www.azom.com /details.asp?ArticleID=2444 (990 words)

	Heat Treatment
		It should be noted that in regards to heat treatment, different types of stone require different temperatures.
		It doesn't have to be large enough to alert the fire department, just so that it heats the coals up good enough to allow them to burn throughout the night.
		Of course this assumes that all the sand is equal and that the fire is spread evenly.
	www.sparrowcreek.com /Heat_Treatment.htm (1414 words)

	Heat Treatment of Structures and Spaces—A View From the Steam Side
		Because different steam heat treatment applications have some common characteristics but many site-specific variables, it is often not possible or practical to use only standard-sized equipment.
		Once total heat loss is determined, several factors govern the selection of the number of units required to deliver properly distributed heat.
		The future of steam-based heat treatment design and equipment is to develop the integration between the basic heat transfer device (finned coil air heater), to blend with integrated temperature sensing, control systems, and drainage in units that are fully portable.
	www.ars.usda.gov /is/np/mba/apr04/steam.htm (1005 words)

	Heat Treatment as a MeBr Alternative
		A number of steps are taken to prepare the area to be heated: equipment and ingredient/work-in-process bins are emptied; garbage/salvage receptacles are emptied and cleaned; heat-susceptible ingredients and packaging material are removed; and circulating fans are placed.
		Heating, ventilating, and air-conditioning (HVAC) systems and dust collectors are shut off, and plastic is used to seal off areas not being heated.
		Once the heat treatment is completed, the following steps should be performed prior to plant start-up: ensure window and door screens are in place for cool down, remove sealing material, close equipment, tighten conveyors, and look for lubricant leakage and top up gearboxes as needed.
	www.ars.usda.gov /is/np/mba/apr04/heat.htm (809 words)

	THERMAL REMEDIATION from TEMP-AIR ®
		Heat is an excellent alternative to chemicals, kills pests at all stages of the life cycle, and may reduce the frequency and duration of plant shutdowns.
		The utilization of heat as a method of controlling pests is not new.
		Heat treatments were introduced in the United States as early as 1911.
	www.temp-air.com /thermal/heat_treatment.asp (1070 words)

	Heat Treatment
		Heat treating was practiced throughout the world in ancient times and is a necessity if you want to create sophisticated tools in materials other than obsidian.
		Heat treating seems to work by a variety of processes, and consequently critical temperatures are highly variable.
		It is almost impossible to predict how a stone will react to heat and it is equally difficult to predict what the critical temperature of any given stone is. The best way is to experiment by heating different rock types together, recording the maximum temperature reached and keeping notes.
	www.geocities.com /knappersanonymous/heat.html (2829 words)

	Ice and Heat Treatment for Injuries - Patient UK
		Ice treatment may be used in both the immediate treatment of soft tissue injuries and in later rehabilitation.
		During immediate treatment, the aim is to limit the body's response to injury.
		If you have to do exercises as part of your treatment it can be useful to do them with ice in place or immediately after it is removed when the area will still be a little numb.
	www.patient.co.uk /showdoc/23069070 (998 words)

	Aluminum Heat Treatment Reference Guide - AluminumHT.com - LA MIRADA Aluminum Heat Treat ...
		A product’s performance is determined by the composition and heat treatment approach that is selected to produce the alloy.
		This type of heat treatment is done at a comparatively low temperature and serves to eliminate growth of thermal cycle.
		This heat treatment improves mechanical properties to a large degree, stabilizes the castings, and usually results in a slightly lower tensile and yield strength but an increased elongation value compared to T6 heat treatments.
	www.aluminumht.com /refguide.html (1005 words)

	Heat and Pain Control. pain relief, heating pad, heat pack, back pain, pain control
		Heat has been one of the most effective ways to help control pain for thousands of years.
		The Heat Treat Backpack is designed to treat back and neck pain using the most up to date scientific information regarding heat and pain control and may be able to reduce or eliminate the need for dangerous drugs.
		People who make use of heating pads to help alleviate their pain often remark that continually using heat made their pain much easier to bear.
	www.heattreat.ca /heatpaincontrol.php (1221 words)

	Heat Treatment
		Except for flanges of A105 materials in Classes 150 and 300, which are normally sold in the "as forged" condition, all flanges 400 PSI and heavier are required to be heat treated.
		Normalize — Heat the forging to a temperature in the austenitic range and hold for a sufficient time to allow uniform heating of the piece.
		Anneal —; Heat the forging to a temperature in the austenitic range and hold for a sufficient time to allow uniform heating of the piece.
	www.boltex.com /heat.htm (259 words)

	Heat treatment kills cancer cells
		This leads Professor Robert Getzenberg and his colleagues to believe the cancer cells would respond well to heat treatment in what they call the "Lance Armstrong effect," after the seven-time Tour de France winner who famously beat testicular cancer.
		The problem with heat therapy would be targeting the cancer cells without doing any damage to the healthy cells.
		Sun heat, water heat and heating pads may treat or cure cancer if its not too deep under the skin.
	www.newstarget.com /019772.html (1829 words)

	Heat Treatment of microcrystalline quartz
		Heat treatment of flint very often makes it much easier to work.
		Various investigators have used scanning electron microscopy to compare the fracture surfaces of heated and unheated cherts (Draper and Flenniken 1984; Flenniken and White 1983; Johnson 1985; Olausson and Larson 1982; Purdy 1974; Purdy and Brooks 1971; Robins, et al 1978).
		Rapid heating results in explosive fractures as excess moisture trapped in voids, fissures, pockets, and in the interstices between microcrystals vaporizes.
	donsmaps.com /heatflint.html (2025 words)

	Heat Treatment/Stress relieve
		Ajax advanced technologies is used for the melting of ferrous and nonferrous metals, heating for forging, mill processes, coating and the heat treatment of steel.
		Heat Treating applications include static and progressive heating for surface hardening of axles, camshafts, wheel bearings, pipe and mill rolls.
		Heat treating furnace designs include: STC (Short Time Cycle) batch roller hearth, continuous roller hearth, rotary hearth, box, tip-up, mesh belt, car bottom, single/multi-stack annealers, walking beam as well as custom furnaces for special applications.
	steellinks.com /pages/Heat_Treatment/Stress_relieve/index.html (1362 words)

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