Steel Division


Areas of application

Our high-strength, water-quenched aldur® steels are used wherever weight savings and operating safety are in demand at low temperatures. Examples are welded structures under high levels of stress in crane and vehicle construction, in mining equipment and pressure piping. We also supply hot-formed chords for jack-up rigs and lift boats in offshore applications.




  • Weight savings are achieved through high strength in conventional structural steels that lead to higher useful loads in crane and vehicle construction and less expensive structures. 
  • Excellent weldability results from low C equivalents with high cold cracking resistance in the heat-affected zone, lower preheating temperatures. High levels of component safety are achieved by toughness in the welded joint.


 Steel grades: Special voestalpine grade 

  • aldur 500 Q, QL, QL1 
  • aldur 550 Q, QL, QL1 
  • aldur 620 Q, QL, QL1 
  • aldur 700 Q, QL, QL1 
  • aldur 900 Q, QL 
  • aldur 960 Q, QL 

Dimensions: Plate thickness: 

  • for aldur 500-700 Q, QL, QL1:12-110 mm 
  • for aldur 900 Q, QL:30-60 mm 
  • for aldur 960 Q, QL:30-50 mm 

Plate width: 

  • for aldur 500 and 550 Q, QL, QL1:3,800 mm max. 
  • for aldur 620 and 700 Q, QL, QL1:3,000 mm max. for d = 12–20 mm3,800 mm max. for d = 20–100 mm 
  • for aldur 900 and 960 Q, QL:2,500 mm max. 

Plate length: 

  • 13,200 mm max. for aldur 700 Q, QL, QL1 16,000 mm max. for d = 12-30 mm 
 Ordered weight: 
  •  At least 20 tons per line item Unit weight: 14.8 tons max. per single plate 

Toughness: Three grade categories are available: 

  • Base grade Q    –20 °C (Design temperature)
  • Cryogenic grade QL    –40 °C 
  • Special cryogenic grade QL1    –60 °C


Contact Person

Heavy plates



High-strength plates made by voestalpine are used in offshore platforms. They are formed using special tools into hot-formed components in the manufacturing of heads.

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Supports and anchors

Offshore platforms stand on adjustable supports. During transport, the supports are retracted and protrude upwards. At the offshore site, they support the platform and anchor it to the seabed. Chords made by voestalpine Grobblech strengthen the gear racks of these supports and thus enable safe operation in adverse environments.

Complex manufacturing process

We developed our manufacturing technology for chords as hot-formed components in our in-house press shop. The pre-material is heavy plate made of high-strength and fine-grained structural steel produced in our own rolling mill. Strips are cut from this plate and formed into chords with a special tool on a hydraulic press with a maximum pressing force of up to 3500 tons. The tool function is based on finite element calculations and guarantees a high level of shape accuracy. After being hot-formed, the chords are water-tempered and straightened. Torch-cut or milled edging on the long and short sides is the final step in the production process.

Steel grade: aldur 700 QL1, S690 QL1, AB EQ/FQ70, VL E/F690

Dimensions: Lengths up to 4200 mm, wall thickness of 120 mm, diameter of 670 mm


High-strength plates

High-strength heavy plates made by voestalpine of fine-grained steels can have a minimum yield strength of up to 700 MPa. The special ultra-high-strength grades achieve a yield strength of up to 1100 MPa.

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High-strength plates

Higher stress

Machines and buildings are becoming bigger and bigger. When the size of a component is doubled in length, width and height, the weight increases by a factor of 8, while the load-bearing cross-sectional surface area only increases by a factor of 4. This increases the stress, or the weight in relation to the cross-sectional surface area, by a factor of two. High-strength steels can absorb these higher stresses, even when the component weight is reduced.

Concrete advantages

The lower weight of high-strength and ultra-high-strength heavy plates saves costs: Input material quantities, transport costs, assembly and foundation costs are reduced substantially. Costs are also saved during further processing. Thanks to favorable weldability, work can be completed more quickly and efficiently. Significantly reduced quantities of welding consumables are required, and weld seam testing is made easier.

Our program

High-strength heavy plates are available as fine-grained steels with a minimum yield strength of 620 and 700 MPa. Ultra-high-strength heavy plates are available as voestalpine special grades at 900, 960 and 1100 MPa.

  • alform plate 620 M, thermomechanically rolled, high-strength fine-grained steels
  • alform plate 700 M, thermomechanically rolled, high-strength fine-grained steels
  • aldur 700, 900 and 960 Q, quenched and tempered, high-strength fine-grained steels
  • alform plate 900 M x-treme, thermomechanically rolled, ultra-high-strength fine-grained steels
  • alform plate 960 M x-treme, thermomechanically rolled, ultra-high-strength fine-grained steels
  • alform plate 1100 M x-treme, thermomechanically rolled, ultra-high-strength fine-grained steels
Steel trade
Steel trade

Steel trade

From standard to special grades, voestalpine is your contact for all the steel grades required in steel trade.

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Steel trade

Trade in all types of steel

A single source for all required steel grades. voestalpine offers standard and special grades for the steel trade. voestalpine offers standard and special grades for the steel trade.

Steel made to measure

voestalpine Steel & Service Center is one of the largest steel service centers in Europe. Highly innovative mechanical equipment enables products in widths, thicknesses and designs not otherwise available. Direct access to production makes distances shorter and processes more efficient.

High-quality appearance for longer

Even after longer storage periods. Products must look perfect and be uniquely processable. This is made possible by a very sophisticated program of additional treatments that are applied according to specific requirements.

A single integrated metallurgical facility.

No matter when or where you order. Steel providers always receive the same high level of quality from voestalpine for their customers. Even after many years. This is made possible by producing at a location that is internationally one of the most innovative and sustainable.

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Offshore voestalpine


Whether in the Gulf of Mexico, in the North Sea or the Arctic, we deliver worldwide high-quality offshore structural steels according to offshore standards EN 10225 (including NORSOK) and API as well as to a variety of other international standards and specifications.

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Made for harshest conditions

Whether in the Gulf of Mexico, in the North Sea or the Arctic, our thermomechanically rolled structural steels for the offshore industry are used worldwide. We deliver high-quality offshore structural steels for fixed and floating offshore platforms according to offshore standards EN 10225 (including NORSOK) and API as well as to a variety of other international standards and specifications.

Offshore plates for oil & gas

Our offshore plates for the oil & gas industry are used worldwide under the harshest conditions. Living continuous development of new products to meet more stringent requirements, we are able to provide prequalified arctic steel for extremely low temperatures. Using toughcore® TMCP plates with extreme high toughness, you are able to increase the level of safety for your offshore structure up to 140 mm thickness.

High-quality plates for efficient electric power generation

Larger monopiles require higher unit weights in cylindrical and tapered pipe lengths. We achieve these weights by welding together two to three plates and call the new unit an XL plate. This highly efficient and innovative welding technique utilizes a four-wire submerged arc welding system capable of producing up to 60-ton unit weights. 

These heavy units meet the growing requirements of offshore wind parks.

voestalpine Qualitätsbleche für die effiziente Stromerzeugung

High-strength plates

As structures and machines become larger, the stresses in the components increase. High-strength steels with minimum yield strengths of 700 MPa or even higher up to 1100 MPa are capable of supporting these higher stresses and simultaneously lead to a decrease in the weight of structural members.

Thermomechanically rolled high-strength fine-grained steels combine excellent toughness with a very low carbon content and the low carbon equivalent and for an optimized weldability.

Shipbuilding steel plates

Our shipbuilding steel plates in normal and high-strength grades are used in offshore applications, platform  superstructures and for special ships in the oil and gas industries, such as floating production storage and offloading vessels (FPSO) and even stainless steel clad plates for icebreakers. 

We offer a wide range of dimensions and grades with best workability for ship manufacture, especially for welding: steel grades up to FH 36 and plates up to 140 mm thick and 3,950 mm wide. High-strength shipbuilding plates are certified e.g. by ABS in FQ70 up to 101.6 mm (4").

voestalpine Grobbleche für den Schiffbau

Chords & racks

In addition to supplying heavy plates, heads and cones, we produce specific pressed parts for the offshore industry. In a specially designed production process, we manufacture high-strength hot-formed components called chords for jack-up rigs. Additionally we offer extremely thick plates for gear racks.

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Stahlbau voestalpine
Steel construction Industry

Steel construction Industry

Our thermomechanically rolled steel grades are the key to efficient steel structures and provide potentially high savings in welding or maintenance.

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Steel construction Industry

Customer-oriented partnerships and tailored solutions in the steel construction industry

Our thermomechanically rolled steel grades and weather-resistant structural steels set benchmarks with respect to their best processing properties and consistently high quality. They are the key to efficient steel structures and provide potentially high savings in welding and maintenance. Industryspecific material and manufacturing expertise, comprehensive preprocessing possibilities, reliability and relationships based on trust make us a trusted partner to the European steel construction industry.

We supply higher strength & lighter weight

alform® heavy plates find their applications wherever high workability and weldability coupled with high strength and weight savings are in demand. Utilization of the higher yield strength of high-strength fine-grained steels as opposed to conventional structural steels results in lower cross-sections. This leads on the one hand to cost savings in lower component weights as well as reduced expenditures for transports, assembly, foundations, component manufacturing, especially in welding as a result of minimized seam cross-sections.

Elimination of paint coating and maintenance

The alloying of small amounts of phosphorus, copper, nickel, chromium or molybdenum leads to the formation of a protective layer on weather-resistant steel outdoors. This layer protects the steel from further corrosion. Weather-resistant structural steels thus provide cost advantages as no anti-corrosion coating or maintenance required of the protective coating is required.

voestalpine Vermeidung von Korrosionsschutzanstrich und Wartung

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Machinery Industry
Machinery Industry

Machinery Industry

The products of voestalpine feature excellent processing properties and provide optimized solutions for the machinery industry.

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Machinery Industry

Made for the toughest tasks

Some industries are what steel was made for. The world of machinery is one of them. Steel made by voestalpine is perfectly within its comfort zone where highest mechanical loads and high-tech materials come together in highly sophisticated designs. Technical limits are constantly being pushed upward by further developments and innovations. Best processability and increasingly demanding mechanical properties lead to complex designs that leave nothing to be desired in terms of performance and efficiency. Steel can be used in the most diverse applications. Wear resistance, ultra-high strengths and high quality in any case.


Exploring new frontiers

What would our daily life be like without machines? Very different, that's for sure. The invention of effective new tools has always been a way of overcoming our limitations, and we are still creating innovative materials to push the limits even further. At voestalpine, we have proven this again and again with new and optimized products. Expertise from a wide range of highly innovative industries is bundled and engineered into materials and solutions for machinery, equipment and vehicles. The solutions are not only convincing in the lab, and they open new possibilities by increasing efficiency in design, production and use.

Consistently reduced weight

When high strength is no longer sufficient. With alform®, voestalpine offers an ultra-high-strength material to be used in combination with the alform® welding system to produce ultra-high-strength weld joints. A reduction in material thickness of more than 70% without compromising any performance results in a weight savings that goes hand in hand with substantially increased efficiency. Best cutability, best forming behavior and excellent toughness round off this power package.

Safely increased efficiency

The demands on the materials used in modern engineering are enormous. Perfect workability during the production process must not be a contradiction to maximum wear resistance and economy of use. With durostat®, voestalpine has succeeded in more than just meeting these requirements. One of the safest, most robust and efficient materials, durostat® boasts of highest durability in abrasive applications, enormous weight savings when compared to conventional structural steels, hardness second to none thanks to a specially developed direct hardening process, best cold formability thanks to fine-grained microstructure and high degree of purity, and best weldability thanks to the optimized carbon equivalent.

The skipster is the true winner in lightness and stability.

alform® makes many things lighter. The thermomechanically rolled (TM) material combines lightness with stability like no other, making it the perfect candidate for countless applications where high load capacity and low weight are essential. This applies to high-tech and complex machinery as well as comparatively simple containers.

TransANT railway freight cars made of high-strength alform® steel

Rail Cargo Group (RCG) was looking for a lightweight design that would meet the logistics requirements of the 21st century. The subsidiary of ÖBB has many years of valuable experience in freight transports and is part of a very strong international network. Coupled with the material expertise of voestalpine, a future-oriented design has now been developed with TransANT. This could be a revolution in railway freight car design.

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