Materials we work with

Materials we work with

Since 2003, when production closed in Denmark, Fe Foundry A/S has built up a network of subcontractors within many types of casting and in many materials. We can therefore advise and produce within many more materials than you see at a regular foundry. We can be the customer's total supplier within casting – regardless of the different alloys that may be used. Below are the most common alloys we can offer, in another alloy we are happy to look at it as well.

Gray iron - GG

Grey iron is grey cast iron with slatted graphite. En-GJL-150 is the type of gray iron that has the longest slats. It's the graphite that gives it gray color.

Grey cast ironthat is easy to cast and machine. Here, carbon is excreted as graphite flakes of different sizes depending on its shape. The shorter the slats, the easier it is to process the cast iron. It has strength similar to aluminum alloys, but is brittle.

The reason why the carbon in grey cast iron appears as graphite is as follows: firstly, grey cast iron has a high silicon content and, secondly, the cooling of grey cast iron is slow compared to the cooling of white cast iron. Grey cast iron contains austenite at higher temperatures, which turns into perlit or ferrite. The graphite does not connect with the iron, so gray cast iron is actually steel and graphite, which is located in a structure. There is a difference in how much draught grey cast iron can withstand. It depends on how much perlit and ferrite is in the gray cast iron. The more perlit the stronger the iron, however, to a certain limit. Grey cast iron contains, as I said, more silicon than white cast iron, in addition, it also contains more carbon than white cast iron. Grey cast iron also contains small amounts ofsulphur,  manganese and phosphorus.

In relation to white cast iron, grey cast iron can be welded, however, white cast iron can be formed on the welded area due to the heating that occurs with the iron. Therefore, it is necessary to cool it slowly. Grey cast iron is not nearly as hard as white cast iron. It also makes it workable. The more ferrite the iron contains, the easier it is to process. Grey cast iron is used for various purposes, but as it is sound-dampening, it is used for machine parts and also for brake discs for passenger and trucks.

For technical data on grey irons and our advice on material selection, depending on use, contact us on +45 0045 97 40 65 10.

Normal alloys within Gråjern:
EN-GJL-150 / GG15 - typically used for wood-burning stoves and grates
EN-GJL-200 / GG20 - typically used for gearboxes
EN-GJL-250 / GG25 - typically used for pump housings
EN-GJL-300 / GG30 - typically used for valves
EN-GJL-350 / GG35 - typically used for cylinder

Sejjern - GGG

Sejjern also called SG-Jern is cast iron with ball graphite. It is a good and often cheaper alternative to forged items of carbon steel. Ball graphite replaces ordinary steel and in many areas has better properties. It is true that the more perlit compared to ferrite, the stronger the iron. The mechanical properties of the iron differ depending on how much of the iron consists of perlit and how much it consists of ferrite

SG iron is used for suspension, turbochargers, hydraulic components and gears.

Alloys within SG iron:
EN-GJS-400-15 / GGG 40 - typically for wheel hubs
EN-GJS-400-18-LT - typically for wind power
EN-GJS-500-7 / GGG 50 - typical for diesel engines
EN-GJS-600-3 / GGG 60 - typically for flanges
EN-GJS-700-2 / GGG 70 - typical for cranks


Carbon steel and special steel alloys, are known as very weldable alloys.

Steel is an alloy of iron with other elements, primarily carbon (carbon) – low content.

Steel's base metal is iron which can take on two different crystal structures, cubic space-centered and cubic flat-centered, depending on its temperature. It is the interplay between these allotropes and the alloy elements, primarily carbon, that gives steel and cast iron their many unique properties. 

Selection of alloys in steel:
GS38 / 1.0420 - typically used for lowering
GS45 / 1.0443 - typically used for automotive wear parts
GS52 / 1.0552 - typically used for weldable wear parts
GS60 / 1.0558 - typically used for harder wear parts
GS70 / 1.0554 - typically used for towing hooks and draughts

Stainless steel

Stainless steel-1
Stainless steel-2

Stainless/ rust solid steel is a generic term for steel typescontaining more than 12% chromium. The addition of other alloy elements, nickel, molybdenum, carbon, nitrogen, manganese, silicon,titanium, etc., has developed a large number of steel types, each of which is characterised by certain properties in terms of corrosion resistance,mechanical strength, weldability and malleability.

The chromium content causes the steels to form a very thin passive oxide film, which makes the steels have good resistance in a neutral oxygen-containing environment. On the other hand, most stainless/rust-resistant steels are not resistant to acid and seawater, and usually not salt.

The steels are usually broken down according to the microstructure, which determines the mechanical properties. The following main types are distinguished:

Ferritic stainless/rustproof steel. The simplest and cheapest stainless steel types. Has mechanical properties reminiscent of unalloyed/low alloy steel. Typically chosen where you want good corrosion resistance at reasonable price. For example, AISI 430 and 440.

Martensitic stainless/rustproof steel. Related to the ferritic stainless steel types, only with higher carbon content, which makes it possible to harden the steel. Can be hardened and possibly called to very high hardness and reasonable toughness. Often used where corrosion resistance and wear resistance are important, such as knives and other cutting tools. For example, AISI 410 and 420.

Ferritic- Austenitic stainless/rustproof steel (Duplex steel). The Duplex steels have a mixing structure consisting of ferrite and austenite (about 50/50). In general, the duplex steels have higher strength than both the ferritic and austenitic, as well as excellent toughness. Has excellent fatigue strength due to the mixing structure (doesn't get easy metal fatigue). Is like the Austenitic steel weldable.

The steels are most often referred to as EN standard (DIN), AISI or UNS. For example, "ordinary" Austenitic stainless steel is referred to as EN 1.4301, AISI 304 or S30400.



Aluminium alloys are resistant to wind and water (lake resistant), - typically used in the Offshore industry.

Aluminium is used in the pharmaceutical industry because it is easy to keep sterile with the very fine-grained surface.

For interiors, aluminum is suitable, due to the very small density. Chairs and tables do not get heavy, but still solid.

By anodizing aluminium, the natural surface of aluminum is recreated and makes it very decorative for, for example, candlesticks.

Selection of aluminium alloys:
AlSi10Mg also heat-treated
AlSi12Mg - also heat-treated


Materials we work with

Bronze is an alloy usually consisting of 90% copper and 10% tin. Sometimes a little leadis also added , as it causes the molten mass to flow better when casting. Other copper alloys are pot andbell, ore, gunmetal and brass.

Bronze alloys are particularly suitable for fittings in the district heating industry.

The special lead bronze is suitable for X-ray equipment because the lead content blocks rays.

Selection of alloys within bronze:
CuSn12 - Tinbronze (90-10)
CuAl10Ni2Mn1 - Aluminium bronze
CuZn31MnAl1 - Brass

Other alloys

white cast iron

There are a myriad of other alloys that can be cast. An example here is white cast iron that has a very high durability. White cast iron is very suitable for wear parts in the concrete industry, as the alloy is very resistant to wear and tear.

Alloys within white cast iron:
GJN-HV600 (XCr11)
GJN-HV600 (XCr14)
GJN-HV600 (XCr18)
GJN-HV600 (XCr23)

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