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Apr. 20, 2022
Cast iron, in grades normally used for items such as bearing housings, gearboxes or machine beds, has a hardness of about 150 to 200 Brinell. With the addition of alloying elements, usually chrome, nickel or copper, the hardness can be increased to over 700 Brinell. This has opened up the use of cast iron into areas where wear resistance is a crucial requirement
We have been producing wear resistant iron castings for over twenty years. As well as castings for wear resistant applications, our customer base also covers the engineering, mining, Oil &Gas, etc. Welcome to get a quote.
All our wear resistant castings are produced to the current ISO material specification, or ASTM standard, along with any further certification which a customer may require. Our diverse customer base has also given us experience in a wide range of other applications for iron castings , including pumps and valves, forges, foundries and rolling mills, automotive and aerospace, a wide range of OEM’s, quarries and mines, railways and rolling stock, local authorities and artists and sculptors. We also have long term trading relationships with local pattern makers, machine shops and surface finishers which enable us to quote for the complete supply of the finished Wear Resistant & Ni Hard Cast Iron Castings.
Programme that has enabled us to keep up with modern production methods and environmental legislation has meant that we have been involved with many projects requiring abrasion resistant castings and continue to be so.
Wear resistance can be achieved in cast iron in two basic ways.
Firstly a normal grey iron can have small additions of copper, molybdenum, vanadium or chrome added. These are usually up to 1% and can increase the hardness from a base of about 150 Brinell up to 200 to 300 Brinell by promoting the formation of pearlite in the casting, particularly if the carbon and silicon levels are controlled to the lower end of the desired range. If these hardness’s are sufficient, this method has the advantage that the resultant alloy is still machinable.
The second method involves the use of chrome and nickel in much higher quantities, the chrome content being as high as 28% to create a structure that includes a high proportion of primary carbides. Although a lot of chrome iron castings are supplied in the as cast state, these alloys are heat treatable, which promotes the growth of secondary carbides, and can attain hardness’s as high as 700 Brinell.
Tempering can be used to increase the toughness. This second method is, unfortunately, only machinable using special techniques and cutting processes which usually results in castings that are cast to size. Where fixings are required it is possible to cast in threaded bars or blocks of steel that can be drilled and tapped after the casting is made to give fixing and location points.
There are a number of ways of describing this highly alloyed type of iron – Chrome Iron, Wear Resistant Iron, Ni Hard or 28% Chrome being the more common ones, along with a range of national and international standards. One side effect of the levels of chrome and nickel used in these grades is that they can have good corrosion resistance which can lead to alternative applications.
Also, given the inherently higher melting point of chrome compared to cast iron, they can be used for heat resistant castings, particularly if the carbon content is controlled to the lower end of the permissible range in some of the 28% chrome grades. These heat resistant versions have applications in castings such as fire bars and grate assemblies in stoves.
We have been producing wear resistant iron castings for over twenty years. As well as castings for wear resistant applications, our customer base also covers the engineering, mining, Oil &Gas, etc. Welcome to get a quote.
For many years, Zen Young Foundry has been providing customized metal casting services for various industries and project types.
Mining & Engineering Machinery Casting Parts
If you are looking for a solution that fits your custom metal Sand casting project, Zen Young can help you produce perfect metal parts through a reliable casting process.
We always welcome special material and difficult parts and would like to help our comstomers utmost.
The material used to make molds for sand casting is sand, not ceramics. Due to the roughness of sand, sand casting is most commonly used for large castings, which usually require less detail precision and tolerances.
Shell mold casting is a metal casting process similar to sand casting, in that molten metal is poured into an expendable mold. However, in shell mold casting, the mold is a thin-walled shell created from applying a sand-resin mixture around a pattern. The pattern, a metal piece in the shape of the desired part, is reused to form multiple shell molds. A reusable pattern allows for higher production rates, while the disposable molds enable complex geometries to be cast. Shell mold casting requires the use of a metal pattern, oven, sand-resin mixture, dump box, and molten metal.
Investment casting is one of the traditional casting methods. That is, the metal is heated to the temperature of the molten liquid, and then the material is poured into a mold designed with a suitable negative space and gated to effectively completely fill the molten metal. Once the metal has cooled and solidified, the metal part can be removed from the mold for finishing. Investment casting, also known as lost wax casting, is usually used to make jewelry and metal parts with complex shapes.
Die casting is a kind of metal casting process, which is characterized by forcing molten metal under high pressure into the forming cavity. The cavity is made using two hardened tool steel molds, which have been processed into a certain shape, and die casting works similarly to injection molds.
Lost foam casting is a type of evaporative pattern casting. it maintains outstanding advantages, especially in casting complicated and precise molds.Unlike traditional methods which include the pattern withdrawn process before casting and require skillfulness in the pattern removal step, with respect to the lost foam method, the pattern is evaporated when the molten metal is poured into helping to reduce these considerations.
We will choose different casting methods for processing according to the product shape, material and your working conditions. Many years of processing experience can guarantee the quality of the casting parts.
