Dillimax is a high yield structural steel that is quenched and tempered according to EN10025-6. It is the brand name of Dillinger Hutte and offers superior performance in comparison to the minimums specified by the standard. It is a highly versatile and very special structural steel with applications as varied as mobile construction equipment, bridge and offshore structures.
The thing that links these diverse applications together is the fact that Dillimax steels enable the designer to significantly reduce the weight of the structure whilst retaining the strength of the steel. This means substantial savings in cost – both in additional structural steel work that is no longer required and reduced requirements for foundations. For moveable equipment Dillimax helps to reduce operating costs over the lifetime of the equipment – providing environmental and operating benefits.
Dillimax’s strength also allows it to be used in situations where architects are looking to deliver powerful aesthetics statements which would not be deliverable with standard structural steels.
Key Features of Dillimax Steels
- Maximum Mechanical Strength
- Outstanding Toughness
- Unusually Good Workability
- Good Suitability for Cold Working and Machining
- Amazing Weldability
The weldability benefits can be seen in the CEV (and CET and PCM values) which are significantly lower than required by EN10025-6.
|EN10025-6 (<50mm)||Dillimax (40mm)|
CEV = C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15
These low carbon equivalent values improve the weldability of the steel – a critical point. Some of our customers who have bought cheaper high strength steels have complained bitterly about the additional cost and time involved in welding when compared to Dillinger’s range of high yield steels.
Dillimax steel plates achieve their special properties through the careful control of the chemical composition during the primary and secondary metallurgies at Dillinger’s Dillingen steel mill, through the rolling and especially through the water quenching and tempering that they undergo. Manufacturing high strength steels requires both excellent equipment and experience and Dillinger has been one of the leaders in high strength steels since they were first developed in the 1970s.
Because of its high yield Dillimax also has a higher degree of wear resistance than normal structural steels which helps to extend the life of plant and machinery. It is also relatively resistant to heat and is thus good for use in plants where there is a high temperature and high friction – such as for fans and drying furnaces in the cement industry.
Manufacturer of Dillimax Steel Plates
To produce a very strong steel low levels of sulphur inclusions are required. One of the critical paths to achieving this is to use low sulphur iron in the steel making process. This is done by removing the sulphur from the pig iron in a process called hot metal desulphurisation. The steel is then made using the basic oxygen process by blowing oxygen in through the top of the ladle. This reduces the carbon content of the steel.
Once the metallurgy has been adjusted with various additives used to control the size and shape of inclusions; as well as the alloying elements required by the grade specification the molten steel is poured into the continuous caster where the slabs for rolling are produced.
The whole process is designed to reduce Phosphorus and sulphur to very low levels. Generally the phosphorus content of the Dillimax slabs is less than 0.02% and the Sulphur less than 0.005%. Alloy levels are kept to a minimum in order keep the CEV values (or PCM or CET) low. Low CEVs mean that the steel is easier to weld. However as the plate thickness increases the amount of alloying required also increases. Thicker plates are thus more difficult to weld. Due to the production process undertaken, and the low alloy content Dillimax steels offer CEVs that are far below the maximal limiting values of EN10025-6.
The 108,000kN rolling forces that are applied to the Dillimax slabs mean that the center of the plate is consistently deformed and homogenous throughout. This offers huge strength. It is delivered by both the huge rolling stands and also through their precise control – so that the force applied takes into account the chemical content of the steel – not just its width and thickness.
Once rolled the plates are then reheated to austenitizing temperatures and then quenched with water in a special quenching process. This gives a fine grained hard microstructure. Once quenched the dillimax plates are then tempered to reduce the hardness and trigger the precipitation process. The result is a microstructure with high strength and good toughness. Tempering is adjusted according to the precise chemical composition and plate thickness required to deliver optimum solutions.
Dillimax Plates Available Ex-Stock
Dillimax steels are kept ex-stock with yield strengths of up to 1100 MPa (based on the MPa at the reference thickness for the grade – thicker plates have lower MPa values). We have the following high strength grades available on an ex-stock basis.
- S690QL – Dillimax 690T 6 – 250 mm
- S690QL1 – Dillimax 690E – 6 – 150 mm
- S890QL – Dillimax 890QL – 6 – 100 mm
- S960QL – Dillimax 965 6 – 100 mm
- S1100QL – Dillimax 1100 6 – 40mm
Typically we stock the QL and QL1 Dillimax variants with minimum impact values down to -40°C (QL) or -60 °C (QL1)
We keep one of the largest stock selections of high strength plates in Europe and maintain good plate coverage at all the grades. That means that if you come to us requiring several (or many plates) of a particular thickness we are likley to have them in stock. There is no need for us to buy in plates to meet your requirements. We keep them in stock for you.
Customer Support for Dillimax Plates
With one of the largest stocks of DIllimax plates available in the world we are able to offer our customers three key benefits
- Large selection of heavy dillimax plates up to 250 mm for special projects
- A good selection of plates at all thickness meaning a convenient supply for one provider
- A large number of Dillimax plates in stock meaning that we can deliver mill sized quantities on demand
Finally as our partner AncoferWaldram is part of the DIllinger group our technical support for these plates is excellent.
Delivery of Dillimax Plates
We supply Dillimax plates up to 250 mm thick to customers across SE Asia and the Asia pacific region as the agent of AncoferWaldram Steelplates, part of the Dillinger Hutte Group. We have regular scheduled deliveries to Indonesia, Malaysia, Singapore, Thailand and Vietnam as well as other ports. Plates can be delivered ex-stock on a next day basis EXW if no cutting or profiling is required. Dillimax plates can be delivered on a CIF basis to most Asian ports in 30 to 40 days depending