Metallic casting is a specialized form of casting involving various types of metallic. Steel castings are used when cast irons cannot give enough strength or shock resistance. Examples of items that usually are steel castings include: hydroelectric turbine wheels, forging clicks, gears, railroad car frames, bodies for valves in addition to pumps, machinery used in mining, marine equipment, and website casings. Steel castings are categorized into two typical groups: carbon steel and alloy steel.
The methods connected with casting steel: The Szekely method consists of employing metal molds, one of the chief points being to coat often the molds with chalk and paraffin. Shaw also implements metal molds. Slavianoff’s electric casting method appears to be simply a method of melting steel by connecting it to one airport terminal of a strong electric circuit, the crucible in which it is for being melted, or the plate on which it is to be cast staying attached to the other.
In the so-called sand core process, a new sand core is cast in the ingot which is soon worked down as usual; it was claimed that the sand to be able to injure the material, but this, as well as any advantage, is quite doubtful. In Norton’s fluid rolling process, fluid material was to be worked direct into sheets by pouring it through revolving rolls properly adjusted, with the idea of blocking blowholes, and reducing the usual amount of scale.
Bessemer’s solution to making continuous sheets consisted in running molten precious metal between two water-cooled steel rolls, separated a suitable yardage; the speed of the rolls was regulated according to the thickness with the sheet. In Whiteley’s process for the production of system, molten steel was run into a revolving cylinder plus formed a shell which was taken out, cut open by just a saw, and then rolled down. Pielsticker and Mueller’s practice was devised for producing bars, rods, and very similar material direct from fluid steel by first passing the item through dies, and then finishing the resultant material in a very rolling mill or under a hammer.
Malleable or cast-iron castings are sometimes united by heating in contact with a high temperature; this is termed “bumming” together. It is sometimes important to make an addition to a casting to complete or to replace part which has been broken off. For this purpose the casting already manufactured is placed in a mold of the proper shape and molten metal poured in.
The solid metal must be heated up to a sufficiently high temperature, and there are two methods which are commonly distinguished as (a) casting on, where the solid metallic is heated with a flame, and (b) burning with, where the molten metal is first caused to run into and even out of the mold until the solid portion has been sufficiently warmed, when the outlet hole is closed, and the mold happen to be fill up.
Wm. Chalk’s method for uniting a sleeve or even boss of cast iron, etc ., on a wrought- iron bars shaft consists in heating the shaft to a welding temperature, putting it in a suitable mold, and flowing around it the molten metal.