Cast Products

METAL TYPES

ABRASION RESISTING IRONS

Scaw Metals' is a leader in the development and promotion of High Chromium Martensitic White Cast Irons.

Scaw Alloys were developed to provide materials that were intermediate between the very tough Austenitic Manganese Steels and the brittle NiHard Alloys and at the same time have superior wear resistance. A major advantage of the Scaw Alloys over NiHard, is the ability to be softened followed by machining and subsequent heat treatment to a hardness in excess of 600 BHN.

AUSTENITIC MANGANESE STEELS

Austenitic Manganese Steels capable of surface work hardening to some 500 BHN under repeated impact while retaining the inherent toughness and ductility of their base metal.

Castings made from Austenitic Manganese Steels are used widely in the manufacture of crusher parts such as bowl liners and mantles, jaws, mill liners and screens, hammers, blow bars, crawler shoes, chute liners and various other applications where servere impact is encountered.

Scaw Metals' range of Austenitic Managanese Steel Alloys are selected according to the specific environment in which they will be utilised.

CARBON STEEL

Scaw Metals' produces a wide range of Plain Carbon and Carbon Manganese Steels to suit customer’s requirements and for general engineering applications.

Low Carbon Steels are used for the production of railway locomotive and passenger car bogie frames, ladles for liquid metal and slag, and castings requiring excellent ductility and weldability.

Medium Strength Castings such as side frames and bolsters for freight cars, crusher frames, wheel centres and housings are made from steels with a higher carbon content. Steels which require surface hardening by means of induction or flame hardening are made from high carbon grades. When a combination of strength and toughness is required in a steel, the addition of manganese and the utilisation of the appropriate heat treatment procedure enable us to achieve these requirements.

GREY CAST IRON

Grey Cast Irons usually contain 2.5% to 4.5% carbon, with varying amounts of silicon and manganese depending on the strength requirements and the section thickness of the casting. The carbon occurs predominantly in the form of flakes or graphite.

Grey Cast Iron has excellent casting properties and is readily machinable. It is available in a wide range of strengths and is used in applications where high shock resistance is not required. The structure and properties of the cast iron are improved by an inoculation procedure in which calcium silicide is added to the ladle.

Grey Cast Iron have moderately good heat resistance and are not prone to warping.

HEAT RESISTING STEELS

The Cast Heat Resisting Steels manufactured by Scaw Metals' are essentially high chromium and nickel alloys. The alloys content is selected according to the service conditions taking into consideration factors such as the operation temperature, the existence of an oxidising or reducing atmosphere, level of sulphur gases, variations in temperature and fluctuating loads. Additional alloys such as cobalt and tungsten may also be included in steels which are to be utilised in severe and aggressive environments.

Castings outperform equivalent wrought heat-resisting alloys since the strength of the former at elevated temperatures precludes them from being made in the wrought form as their high strength renders them unworkable. The environment in which the casting is to operate will have a significant effect on its performance and a casting’s maximum service temperature is a function of the alloy content. In general, for oxidising or reducing atmospheres which are high in sulphur, high-chromium low-nickel steels are superior.

In carburising atmospheres, resistance to carburising is essential.

High nickel content minimises carbon pick-up, even when carburised high nickel alloys retain sufficient hot ductility to prevent cracking from thermal cycling. Abrasion resistance, such as that required in the manufacture of sinter plant grate bars, is achieved by the use of high-chromium carbon steel.

LOW ALLOY STEELS

Scaw Metals' produces a number of standard specifications and also a wide range of Low Alloy Steels to suit customers particular needs or their in-house specifications.

These alloys provide a range of high strength materials which can accommodate most engineering requirements, thus enabling engineers to design lightweight equipment.

The mechanical properties show are only examples - different heat treatments allow a wide range of properties from, a number of these alloy due to space limitations, not all of the range of low alloysteels available are shown.