Sheet steel

The curve minima (labeled with A) are ascribed to the presence of the weld joining the head to the shell because thickness in the weld zone is greater than the one of the steel sheet. 

Polyester and polypropylene films have been laminated (ca 1991) to base steel sheet to impart protection to the metal. These laminated metals are used to make two-piece drawn cans. 

International Conference on Einc and Einc Alloy Coated Steel Sheet, Sept. 5—7, 1989, Tok o, Iron and Steel Institute of Japan, 1989. 

IF Steel Sheet, Processing Fabrication and Properties, Canadian Institute of Mining, Metallurgy and Petroleum, Montreal, Quebec, Canada, 1991. 

Stainless steel sheet metal same-width heat exchanger surface wrapped Tank around tarik... 

Tin is used in various industrial appHcations as cast and wrought forms obtained by rolling, drawing, extmsion, atomizing, and casting tinplate, ie, low carbon steel sheet or strip roUed to 0.15—0.25 mm thick and thinly coated with pure tin tin coatings and tin alloy coatings appHed to fabricated articles (as opposed to sheet or strip) of steel, cast iron, copper, copper-base alloys, and aluminum tin alloys and tin compounds. 

Because of the steep pitch required, slides are limited in application. They are most commonly used to bridge the gap between roller-conveyor systems on two floors, because the roller conveyor can take the container off the slide rapidly and ehminate or reduce the chance for collisions. Slides may also be used when containers can be chuted from an upper floor to a manually loaded carrier. The use of several rollers at the feed point is recommended for easy dehveiy to the sloping section. If the drop is short and containers light, a roller cleanout will prevent backup of containers on the slide. The slope of gravity slides is a function of container weight, size, and friction characteristics and should be selected with care to be sure that containers do not move either too swiftly or not at all. Slides usually use flat steel sheet. 

At first sight, the answer would seem to be to increase the thickness of the zinc layer. This is not easily done, however, because the hot dipping process used for galvanising is not sufficiently adjustable and electroplating the zinc onto the steel sheet increases the production cost considerably. Painting the sheet (for example, with a bituminous paint) helps to reduce the loss of zinc considerably, but at the same time should vastly decrease the area available for the cathodic protection of the steel and if a scratch penetrates both the paint and the zinc, the exposed steel may corrode through much more quickly than before. 

Under aggressive corrosion conditions it is estimated that the maximum corrosion current density in a galvanised steel sheet will be 6 X 10 A m . Estimate the thickness of the galvanised layer needed to give a rust-free life of at least 5 years. The density of zinc is 7.13 Mg m , and its atomic weight is 65.4. Assume that the zinc corrodes to give Zn " ions. 

Artefacts Galvanised steel sheet, new and old anodised Al polymeric roofing material corroded exhaust system. 

Fig. 2-20 Influence of potential on hydrogen permeation 1 -mm-thick steel sheet/ aerated seawater.

Fig. 5-4 Cell currents between a coated specimen (5 = 300 cm ) and uncoated steel electrode (5 =1.2 cm ) in NaCl solutions at 25°C. Left shot-peened steel sheet, 150 pva EP-tar. Right hot-dipped galvanized steel sheet, 150 jim EP-tar.

Fig. S-6 Relation between the density of cathodic blisters and potential shot-peened steel sheet without primer ( ) and with about 40 /tm primer coat (Zn ethyl silicate + polyvinyl butyral) ( ) top coat 500 /tm EP-tar ...

Very often steel sheet pilings exist in conjunction with steel-reinforced concrete structures in harbors or locks. If cathodic protection is not necessary for the reinforced concrete structure, there is no hindrance to the ingress of the protection current due to the connection with the steel surfaces to be protected. The concrete surface has to be partly considered at the design stage. An example is the base of the ferry harbor at Puttgarden, which consists of reinforced concrete and is electrically connected to the uncoated steel sheet piling. 

The Nippon Steel Corporation in 1972 pioneered the use of continuous annealing lines , in which rolled steel sheet is heat-treated and quenched under close computerised control while moving. For this advanced process to give its best results, especially when the objective is to make readily shapable sheet for automobile bodies, steel compositions have to be tailored specifically for the process composition and processing are seamlessly tied to each other. Today, dozens of these huge processing lines are in use worldwide (Ohashi 1988). 

Organic coatings (plastic and paint) can be applied to extend the steel s life, while at the same time giving it an attractive appearance. The walls of many industrial and commercial buildings are made from pre-painted steel sheets. Frequently, a combination of galvanizing and organic coatings is used. 

Tinplate is thin steel sheet with a minute coating of tin applied. This is used for producing food and drinks cans, where rust must be prevented at all costs. 

Cold-rolled steel sheet, strip, and bars... 

Very large downdraft tables have been used for sources such as electro-cutting and welding of large steel sheets. 

FIGURE 15.3 Example of a product system, production and use of steel sheet metal, for fife cycle inventory analysis. 

TABLE 15.1 Calcutation of Total Elementary Flows from the Steel-Sheet Product System of Fig. 15.3... 

Unit process Dust emission per unit process reference flow, O (kg/ton or kg/MJ) Unit process reference flow per product system reference flow, F (ton/ton or MJ/ton) Dust emission per product system reference flow, D x F (kg/ton steel-sheet)... 

Galvanized steel A zinc-coated steel sheet or plate with good corrosion resistance properties used for ductwork and other applications. 

This proviso draws attention to the fact already mentioned that the enhanced corrosion resistance of low-alloy steels is not usually obtained in wet conditions. Presumably the copper steel sheets, in turn would have outlasted sheets of ordinary steel. 

Probably the most familiar coated steel sheets are the ubiquitous galvanised corrugated roofing and cladding sheets which have been used for many years, particularly for farm buildings, either painted or unpainted. In addition to zinc other metallic coatings are available, e.g. hot dip aluminium and hot dip aluminium-zinc alloys. 

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