Iron

Iron


The application for cast iron are expansive and we pride ourselves on the ability to produce one off / small batch castings through to regular running batch work. We also operate a separate track and floor casting for larger scale production giving us economies of scale to ensure we offer competitive lead times and prices. Operating at up to 1000kg below are the common materials we manufacture:

Gray Iron (200/220/250) Grey iron is one of the most versatile and most commonly used of all irons worldwide. Grey iron offers excellent machinability and strength lending itself to a wide range of applications from heritage rail through to gas and oil industries.

Ductile SG Irons (420-12/500-7) SG Iron also known ductile iron, is a type of cast iron developed to copy the key qualities of mild steel. SG iron has much more impact and fatigue resistance compared to grey iron due to its nodular graphite formation. This material offers itself perfectly to automated machine components, intricate forms and decorative uses.

High Chrome Iron (Commonly 28%) Used widely with cast wear parts this material was developed to give the key wear resistance that other irons cannot offer. Heat Treatment of this material can increase the Brinell hardness further if required. Common uses include crusher teeth, surface finishing machine equipment and slurry pump impellers.


CHC Sheffield

In compliance with our ISO accreditations all our casting materials are obtained from trusted and sustainable suppliers with full tractability and certification being a key supply feature we offer to all our customers.

Other Materials


Technical Capabilities


Copper Based Alloys

Copper Based Alloys


With Copper as their principal component bronze and brass castings by nature have a high resistance against corrosion and wear. Other elements are what separate the two and give them their own unique properties, the Tin in Bronze further increases the corrosion resistance and tensile strength and the Zinc in Brass again increases the tensile strength of the material as well as aiding with thermal conductivity.

With a total melting capacity of 300kg on site and an achievable individual casting weight around 60kg the typical materials what we manufacture with are:

Leaded Gunmetal (LG2 & LG4) has excellent machinability and great wear resistance with a high resistance to corrosion. This makes it a great all round option often used wear pressure tightness is required such as valve and pump bodies. It also is ideal for decorative plaques and will produce a high quality polished surface.

Phosphor Bronze (PB1 & PB2) have a good resistance to cold, corrosion and sea water but are great for use where high mechanical strength and high fatigue strength are needed. Typical applications include load gears and worm drives that have some high speeds as well as high loads. It also performs well under impact and loading so we’re often casting bushes, bearings and impellers in these metals.

Aluminium Bronze (AB2 & AB3) which has very high strength, wear and is highly corrosion resistant. A key feature is also its ability to perform through a temperature range of -200c to 200c. High strength cast bushes and cast bearings typically used in aerospace applications are a common casting.

High Tensile Brass (HTB3) is an option for engineering castings where high wear resistance and high load bearings are encountered.


CHC Sheffield

In compliance with our ISO accreditations all our casting materials are obtained from trusted and sustainable suppliers with full tractability and certification being a key supply feature we offer to all our customers.

Other Materials


Technical Capabilities


Aluminium

Aluminium


Charles H Coward Ltd manufactures a wide range of aluminium alloys using sand, gravity die and pressure die casting processes for both engineering and architectural applications. Different alloys provide different properties and our expertise in metallurgy means we can work with you to determine the best specification for your needs. Our total melting capacity is 2500kg and typically we produce items the following allots:

LM4 – Popular alloy for sand, gravity and pressure die cast engineering components; cylinder heads, manifolds, engine mounts, gear boxes, etc.

LM6 – Sand and die casting alloy, particularly used for thin-walled intricate castings also offers excellent resistance to corrosion under both ordinary atmospheric and marine conditions.

LM13 – This alloy shows high resistance to corrosion under atmospheric conditions. Good for gravity die casting used commonly in pistons.

LM25 – This heat-treated alloy has good machining properties whilst resistance to corrosive attack by sea water and marine atmospheres is high. Great for sand casting and gravity die casting for a high integrity product when typically heat treated to TF condition. Typically used in automotive industry but also in high end engineering.

LM27 – Is a very versatile alloy used for general purpose castings requiring moderate strength and mechanical properties. It is ideal for both sand casting and gravity die casting, slightly superior to LM4 and used throughout similar applications.


CHC Sheffield

In compliance with our ISO accreditations all our casting materials are obtained from trusted and sustainable suppliers with full tractability and certification being a key supply feature we offer to all our customers.

Other Materials


Technical Capabilities


© Copyright 1948 - C.H. Coward Limited.

540 Ecclesfield Road, Sheffield, S5 0DJ

Company number 00456385

VAT GB 172 41 8077

      

Designed & Hosted by Weble