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galvannealed coating

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Published: 01 December 2004
Fig. 47 Microstructure of a galvannealed coating on a low-carbon steel sheet. Note the various intermetallic compounds that developed. Etched in 100 mL amyl alcohol containing 1 mL nitric acid and 1 g picric acid for 20 s, followed by the same concentration solution plus 4 drops More
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Published: 01 January 2003
Fig. 7 Stages in the development of a galvannealed coating structure More
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Published: 01 January 2006
Fig. 2 Schematic of the powdering and flaking of galvannealed coatings on sheet steels. OD, outside diameter; ID, inside diameter More
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Published: 01 January 1994
Fig. 9 Galvanneal coating microstructure composed of zeta, delta, and gamma phases. Scanning electron microscope cross section More
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Published: 01 January 1994
Fig. 10 Galvanneal coating microstructure composed of mostly delta phase. Scanning electron microscope cross section More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003688
EISBN: 978-1-62708-182-5
... Abstract This article describes the basic principles, processing steps, and benefits of continuous hot dip coatings. It provides useful information on the principal types of coatings applied in the hot-dip process. The types of coatings include galvanized coatings, galvannealed coatings, 55Al...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001270
EISBN: 978-1-62708-170-2
... and cold lines. Post-Treatments After the coating has been applied, several options are available for post-treatment of the strip. One possibility is galvannealing to produce zinc-iron alloy coatings, as discussed in the section “Zinc-Iron Alloy Coatings” in this article. Another is spangle...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005164
EISBN: 978-1-62708-186-3
... lubricants, or when developing new parts using prototype tooling. Both electrogalvanized and galvannealed steels have been shown to be sensitive to changes in tooling material between gray cast iron, nitrided gray cast iron, torch-hardened cast iron, bare steel, TiN-coated steel, and CrN-coated steel ( Ref 1...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003761
EISBN: 978-1-62708-177-1
... or by electroplating, as in producing an electrogalvanized layer. There are also commercial hot dipped aluminum-zinc alloys, including Galvalume (a Zn-55% Al + 1.6% Si alloy) and Galfan (a Zn-5% Al alloy). There is also a zinc coating called galvanneal, which is a heat treated layer of a galvanized coating on a low...
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Published: 01 December 2004
Fig. 29 Hot dip galvanized 1006, UNS G10060, steel. The galvannealed process produced a coating with no free zinc. Coating weight: 275 g/m 2 (0.9 oz/ft 2 ). Etchant: amyl-nital. 550× More
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005594
EISBN: 978-1-62708-174-0
... welded if the appropriate equipment is used with suitable welding conditions. This is particularly true for thin sheet or strip steel products, whether uncoated or coated. Weldability and the thickness of the metals joined are key factors in determining whether two materials can be resistance spot welded...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002466
EISBN: 978-1-62708-194-8
... exits the bath, the thickness of the molten metal film is controlled by gas wiping dies that remove excess coating metal. After coating, the sheet is either cooled by forced air or subjected to an in-line heat treatment, called galvannealing, before being rewound into coil or sheared into cut lengths...
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Published: 01 January 2003
Fig. 3 Trend of paint delamination of steel products. (a) Cold rolled steel. (b) Hot dip galvanized steel. (c) Galvannealed steel (Fe-Zn alloy). Coating is approximately 25 μm electrophoretic paint with and without phosphate treatment. Artificial damage by Van Laar scratch, scalpel comparable More
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004162
EISBN: 978-1-62708-184-9
... and in part to comparatively higher coating weight variability. Hot Dip Galvannealed Steel Hot dip galvannealed steel has a coating that consists of a series of zinc-iron intermetallic compounds. It is produced by heating hot dip galvanized steel to facilitate interdiffusion of the iron and zinc...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003781
EISBN: 978-1-62708-177-1
... in concentrations under 1%. The effects on microstructure produced by these elements are described as follows. Zinc has a familiar role as a protective coating for steel in galvanizing processes. Pure zinc and zinc-aluminum alloys are used in continuous hot dip processes. The galvanneal process uses zinc-iron...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003808
EISBN: 978-1-62708-183-2
... Zinc Zn (a) 42–550 6–78 Sacrificial coating, good corrosion resistance Automotive, metal building, construction, and appliances Zinc-iron (galvanneal) 7–14 Fe 30–90 4–13 Good corrosion resistance, excellent spot weldability and paintability Autobody panels, floor pans, wheel house liners...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... galvannealing, before being rewound into coil or sheared into cut lengths at the exit of the line. Hot-Dip Zinc-Iron Coatings Also known as galvanneal, zinc-iron alloy coatings produced by the thermal diffusion and alloying of a galvanized coating with a steel substrate were developed during the 1970s...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003678
EISBN: 978-1-62708-182-5
... on galvannealed and high-strength-steels. For cold forming and lubrification, coating weights of up to 60 g/m 2 (0.20 oz/ft 2 ) are common. These layers are sometimes referred to as “heavy phosphating” and are often, but not always, based on manganese- rather than zinc-phosphate layers. Table 2 gives...
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
... prior to metalworking, heat treating, melting, joining (e.g., welding, brazing/soldering, and shrink fitting) and coating (e.g., galvanizing, galvannealing, tinning, film depositioning, etc.) applications. While these are the most common uses, a variety of other operations, such as paint curing...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001271
EISBN: 978-1-62708-170-2
... of an electroplated coating are also required. However, recent advances in hot-dip coating technology have improved the quality of the hot-dip Zn-Fe coating or so-called Galvanneal coating. This has contributed to a decline in the production and use of the electroplated Zn-Fe coating, along with the fact...