aldur® steels are water-quenched, high-strength fine-grained steels with a minimum yield strength between 500 and 960 MPa and with excellent toughness at low temperatures.

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


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 mm

3,800 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


Three grade categories are available:



Design temperature

Base grade


   –20 °C

Cryogenic grade


   –40 °C

Special cryogenic grade


   –60 °C


Technical terms of delivery aldur® 500-960 heavy plate
Technical Terms of Delivery (English, 871.75 kB)


Data sheet aldur® 500-960 heavy plate
Data sheet (English, 376.16 kB)

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