Important Message

Dear Customer,

After 123 years of trading, Charles Butcher and Co Ltd, and its operating company, Durham Foundry (Sheffield) Ltd, are ceasing trading. This has not been an easy decision but the board believes that it is the right time to do so and is in the best interests of the shareholders. This is a planned closure and the companies are wholly solvent.

Current orders will be honoured but we will be unable, unless specifically agreed, to take on any new work.

To enable the closure to happen as smoothly as possible, we have entered into an agreement to try and transfer work to Canlin Castings Ltd. They are a similar foundry to Durham Foundry offering the same range of material grades, quantities and weights. Their details are:-

Canlin Castings Ltd,
North Street,
Langley Mill,
NG16 4DF

Tel: 01773 715412

The contact there, to discuss how work may be transferred, is David Carlin who can be contacted at

If you wish to discuss anything regarding the closure, please contact me on 0114 249 4977 or email me at

Mike Naylor
Chairman and Managing Director
Charles Butcher and Co Ltd and Durham Foundry (Sheffield) Ltd

Durham Foundry Logo
ISOQAR Registered & UKAS Management Systems

Certificate Number 8140

ISO 9001 | ISO 14001

Austempered Ductile Iron

Austempered ductile iron, also known as ADI or ausferritic ductile iron, is the most recent addition to the ductile iron family. It is produced by giving the conventional ductile iron a special austempering heat treatment. Nearly twice as strong as pearlitic ductile iron, ADI still retains high elongation and toughness. 

About Austempered Ductile Iron Castings

ADI provides a material with superior wear resistance and fatigue strength to conventional ductile iron, cast and forged aluminum and many cast and forged steels. The mechanical properties of ductile iron and ADI are primarily determined by the metal matrix. The matrix in conventional ductile iron is a controlled mixture of pearlite and ferrite. The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite called ausferrite.

The austempering process is neither new nor novel and has been utilized since the 1930’s on a cast and wrought steels. The austempering process was first commercially applied to ductile iron in 1972 and by 1998 worldwide production was approaching 100,000 tonnes annually. All our austempered ductile iron castings are produced to the current ISO material specification, BS ISO 17804, along with any further certification that a customer requires.

Austempered Ductile Iron Castings Production

At Durham Foundry we have been producing austempered ductile iron castings for the last 30 years. As well as austempered ductile iron castings, our customer base also covers grey, ductile and alloyed irons for the engineering, decorative, architectural and artistic sectors and we can supply castings from one-off up to small to medium batch production using Alkali Phenolic resin bonded sands. Our workforce of highly skilled molders can work from complex loose pattern equipment, particularly where low volumes are required, whilst our molding line is suited for batch production. Our long trading history, coupled with an investment 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 austempered ductile iron castings and continue to be so.

Our diverse customer base has also given us experience in a wide range of applications for austempered ductile 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 casting.

Austempered Ductile Iron Castings Properties

ADI is a group of materials whose mechanical properties can be varied over a wide range by a suitable choice of heat treatment. A high austempering temperature, 750F (400°C), produces ADI with high ductility, a yield strength in the range of 500 MPa with good fatigue and impact strength. These grades of ADI also respond well to a surface strain transformation which greatly increases their bending fatigue strength. A lower transformation temperature, 500F (260°C), results in ADI with very high yield strength (1400 MPa (200 MPa)), high hardness, excellent wear resistance and contact fatigue strength. This high strength ADI has lower fatigue strength as-austempered but it can be greatly improved with the proper rolling or grinding process. Thus, through relatively simple control of the austempering conditions, ADI can be given a range of properties unequaled by any other material. Small amounts of alloying elements such as nickel, copper and molybdenum are used to produce the desired heat treated result.

Got a question regarding your casting project?

Contact Us