Ductile And SG Iron Castings

At Durham Foundry we manufacture engineering, architectural and decorative ductile and SG iron castings to the current ISO standard, ISO 1083 (2004). This internationally recognised quality standard is specific to the Cast Iron industry sector.

Cast Iron Castings

An example of patterns ready for moulding and then casting in an ISO 1083 Grade

Cast Iron Castings

The pouring of an ISO 1083 standard Ductile Iron Casting

BS, EN & ISO Standards

At Durham Foundry we manufacture engineering, architectural and decorative ductile and SG iron castings to the current ISO standard, ISO 1083 (2004). This internationally recognised quality standard is specific to the Cast Iron industry sector. We have specified and manufactured high quality castings to BS 2789 (1985), BS EN 1563 (1997), and to ISO 1083 (2004) standards on many engineering casting projects. As a contractor in the foundry sector we understand the importance of these standards for your engineering application.

Ductile Iron Standards - Timeline

  • ISO 1083 (2004) - Current Standard
  • BS EN 1563 (1997) – Current Standard
  • BS 2789 (1985) - Replaced by BS EN 1563 (1997)

BS 2789

A source of confusion is the large number of production standards that have grown up across the world to enable buyers to specify a particular grade. To take the UK as an example one of the earlier standards used was BS 2789. Within this standard the grades were specified by tensile strength and proof stress in tons/in¹ and elongation in %. This was changed to N/mm² as the UK went through metrification and the tensile strengths and proof stresses were adjusted slightly to fall in line with their European equivalents.

BS EN 1563

In 1997, BS2789 ceased to exist as a current standard and was superseded by a Euronorm standard, BS EN 1563. This basically took the data from BS 2789 and transferred it to the new standard. This was the start of the transition process from British Standards (BS) to the European Committee for Standardisation (EN) & then onto the International Standards Organisation (ISO) which is the modern industry standard used by Durham Foundry.

ISO 1083

A second set of standards that run in parallel with the BS EN range are the ISO standards. The current ISO standard for ductile iron is ISO 1085 (2004), the grades being much the same as BS EN 1563. It says a lot for the extensive, world wide applications for ductile iron that an ISO standard is available for it. There are also mechanisms in place to harmonise all these standards into a BS EN ISO range, although at the moment that work is still ongoing.

It should also be noted that because of this international usage, countries often have a history of local standards for ductile iron such as ASTM in America, DIN in Germany and SAE in Italy.

Finally, in an effort to offer cast iron with specific or tightly controlled properties, some companies produced ranges of grades which are covered by a trade name. A good example of this is the Meehanite range of grades. These were developed by the Meehanite Metal Corporation in America, and can be produced under license by an approved foundry. Nearly all of these trade named ductile irons are no longer commercially available, Meehanite being the notable exception.

If you need to order a casting in ductile iron and are confused by its description or it has a specification you don’t recognise on a drawing, please contact us as there is a good chance we will recognise it. If we don’t, we have access to a world wide data base that should enable us to identify the material and offer the equivalent grade within ISO 1083.

Available Grades within the ISO 1083 Standard

The current ISO standard for ductile iron, ISO 1083, specifies grades either by tensile strength, proof stress and elongation or Brinell hardness. Tensile strength is by far the more common specification. The following table shows the range of grades available within the current ISO standard, by tensile strength.

Material/Designation Tensile Strength (N/mm2) Proof Stress (N/mm2) Elongation %
ISO 1083/JS/350-22/S 350 220 22
ISO 1083/JS/400-18/S 400 250 18
ISO 1083/JS/400-15/S 400 250 15
ISO 1083/JS/450-10/S 450 310 10
ISO 1083/JS/500-7/S 500 320 7
ISO 1083/JS/550-5/S 550 350 5
ISO 1083/JS/600-3/S 600 370 3
ISO 1083/JS/700-2/S 700 420 2
ISO 1083/JS/800-2/S 800 480 2
ISO 1083/JS/900-2/S 900 600 2

As can be seen, the material designation gives the technical information about each grade within the designation. These tensile results are from separately cast test bars and the test is to standard so long as the test bar exceeds the minimum tensile strength, proof stress and elongation of the grade and does not exceed the tensile strength by more than 100 N/mm2. The actual tensile strength of the casting may vary depending on section thickness. It should also be noted that there is no chemical analysis in ISO 1053 This can be supplied if required, but would be purely for information and does not form part of the specification. There are also low temperature versions of ISO 1083/JS/350-22/S and ISO 1083/JS/400-18/S where Charpy impact tests are carried out at -40°C and -20°C respectively. These grades are used in low temperature environments where it is important to retain ductility at these temperatures.

Durham Foundry & the ISO 1083 Standard

All our castings are produced to the current ISO specification, ISO 1083 (2005), along with any further certification which a customer may require. Our diverse customer base has given us experience in a wide range of applications for ductile iron castings across many market sectors including pumps and valves, forges, foundries and rolling mills, automotive and aerospace, a wide range of OEM's (Original Equipment Manufacturers), 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 machined and painted castings.

Please browse our website for more information about Ductile Iron Castings (ISO 1083 - BS EN 1563 - BS 2789) from Durham Foundry and our ability to manufacture Engineering Ductile Iron Castings to the ISO 1083 standard then contact us on 0114 249 4977 or e-mail us on castings@durhamfoundry.com.

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