Steel Division

Offshore

Jack-up-Rig

Chords

High-strength heavy plates are found in offshore platform applications. We use a special tool in the head press shop to hot-form parts used in offshore platforms.

Support and anchoring system

Offshore platforms are supported by adjustable feet. During ocean transport, the feet are retracted and point upwards. At the designated location, the stands are extended until they reach the sea floor. Chords made by voestalpine Grobblech strengthen the gear racks of the feet and allow safe operation in rough conditions.

Complex manufacturing process

We developed our manufacturing technology for chords as hot-formed parts in our in-house press shop. The pre-material is heavy plate of high-strength fine-grained structural steel from 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 3,500 tons. The tool function is based on finite-element calculations and guarantees a high degree of accuracy to shape. After being hot-formed, the chords are water-quenched and straightened. The edges are flame-cut and milled on both the side and end faces.

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

Dimensions: Lengths up to 4,200 mm, wall thickness of 120 mm, diameter 670 mm


Shipbuilding steel plates

Shipbuilding steel plates

Our shipbuilding steels in normal and high-strength grades are used in offshore applications, platform superstructures and for special ships in the oil and gas industry.

Areas of application

Steel shipbuilding plates are used in the cabin structures of cruise ships. The especially thin but wide plates are used for such applications to offer the best processing properties such as flatness and weldability. In contrast, high-strength, thermomechanically rolled shipbuilding plates are used in offshore applications. They are used for platform superstructures or for special ships in the oil and gas industry.

Safety and quality

We guarantee the highest safety and quality standards and meet all the requirements of renowned certification companies.

  • DNV-GL
  • Registro Italiano Navale (RINA)
  • Bureau Veritas (BV)
  • Lloyd's Register of Shipping (LRS)
  • American Bureau of Shipping (ABS)
  • Russian Maritime Register of Shipping (RMRS)

Steel grades

A, B, D, E

AH 32 TM, A 32 TM, DH 32 TM, D 32 TM, EH 32 TM, E 32 TM

AH 36 TM, A 36 TM, DH 36 TM, D 36 TM, EH 36 TM, E 36 TM, FH 36 TM, F 36 TM

 

Dimensions

Plate thickness

5–140 mm max. (dependent on width and steel grade)

Plate width

3,950 mm max. (dependent on thickness and steel grade)

Plate length

18,700 mm max. (dependent on thickness and steel grade)

Ordered weight 

At least 2 tons per line item

Unit weight

19.5 tons max.


Stahlbrücke

Thermomechanically rolled fine-grained structural steel plates

alform®-steels are thermomechanically rolled steels with excellent weldability, toughness and cold-forming behavior.

We supply thermomechanically rolled heavy plates made of fine-grained steels with minimum yield strengths ranging from 355 to 550 MPa with exceptional toughness and the best welding and forming properties.

As a special high-quality voestalpine grade, alform® steels are found in structural steel work, bridges, pressure pipes and in vehicle and crane manufacturing.

Our thermomechanically rolled fine-grained steels are characterized by a high degree of toughness and excellent weldability. The low degree of cold cracking and high degree of toughness in the welding seam lead to a high degree of safety in welded structures.

Utilization of the higher yield strength in the high-strength fine-grained steels (alform plate 420 M, 460M, 500 M und 550 M), as opposed to the conventional S355, results in thinner cross sections that lead to cost savings through light-weight components and thus to less expensive transportation, assembly and foundations. Savings are also achieved in component manufacturing, particularly in welding.

Steel grades

Special voestalpine grade

alform plate 355 M

alform plate 420 M

alform plate 460 M

alform plate 500 M

alform plate 550 M

Fine-grained structural steels, thermomechanically

rolled in accordance with EN 10025-4

S355M, ML

S420M, ML

S460M, ML

Dimensions

Plate thickness

8–100 mm for special voestalpine grade alform plate 355 M, alform plate 420 M and alform plate 460 M

8–80 mm for special voestalpine grade alform plate 500 M and alform plate 550 M

8–100 mm for S355, S420, S460 M, ML

Plate width

3,800 mm max. (dependent on thickness and steel grade)

Plate length

18,700 mm max. (dependent on thickness and steel grade; up to 24,000 mm max. available upon request)

Ordered weight 

At least 20.0 tons per line item

Unit weight

20.0 tons max. per single plate


Mobilkran

High-strength plates

High-strength plates made of fine-grained steel have a minimum yield strength of 620 and 700 MPa, and ultra-high-strength special grades achieve yield strengths of up to 1100 MPa.

Higher stresses

Machines and buildings are becoming ever larger. When you double the values of length, width and height of a component, the weight grows by a factor of 8, while the supporting cross-sectional area only grows by a factor of 4. This doubles the stress, which is calculated with the weight divided by the cross-sectional area. High-strength steels are capable of supporting these higher stresses and simultaneously lead to decreased weight of the component.

Specific advantages

The low weight of high-strength and ultra-high-strength heavy plates saves costs: The pre-material expenses, transport charges, and the assembly and foundation costs drop drastically. Add to that the costs saved during further processing of the material. Thanks to the excellent welding properties, work can proceed quickly and efficiently. On top of this, much less filler metal is required, and the weld seam test is simplified.

Our portfolio

We deliver high-strength heavy plates as fine-grained steels with a minimum yield strength of 620 and 700 MPa and ultra-high-strength heavy plates with a minimum yield strength of 900, 960 and 1100 MPa as special voestalpine grades.

  • 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 steel
  • 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

Förderplattform

Offshore plates

Whether in the Gulf of Mexico, in the North Sea or the Arctic, our thermomechanically rolled structural steels for the offshore industry are in use worldwide.

Applications under the harshest conditions

We deliver high-quality offshore structural steels and thermomechanically rolled shipbuilding plates for drilling platforms, oil platforms and jack-up rigs. These steels are also used in foundations for offshore wind parks and floating production storage and offloading vessels (FPSOs). In addition, we are in a position to produce chords for the feet of jack-up rigs. We supply prequalified material with plate thicknesses of up to 101.6 mm and CTOD values down to -40 °C for applications in arctic regions (arctic steel). Our thermomechanically rolled offshore plates are characterized by a high degree of toughness and excellent weldability. The low degree of cold cracking and high degree of toughness in the welding seam make it possible for us to guarantee the highest safety standards in welded structures.

Steel grades

Compliant with EN 10225:

S355G5+M, S355G6+M, S355G7+M, S355G8+M, S355G9+M, S355G10+M

S355G2+N, S355G3+N, S355G7+N, S355G8+N

S420G1+M, S420G2+M

S460G1+M, S460G2+M

All TM grades available up to 101.6 mm, available prequalified according to Annex E

Compliant with API 2H:

API 2H-50N (normalgeglüht bis 100 mm)

Compliant with API 2W:

API 2W-50, API 2W-50T, API 2W-60 (available 101.6 mm prequalified according to API RP2Z)

Compliant with API 2 MT1:       

API 2 MT1

Dimensions

Plate thickness

6-130 mm (dependent on steel grade)

Plate width

3,850 mm max. (dependent on thickness and steel grade)

Plate length

18,700 mm max. (dependent on thickness and steel grade)

Unit weight

28.0 tons max. per single plate

Prequalified 

Our offshore structural steels are qualified before they are put into use: Our stringent testing procedures are implemented under operating conditions to inspect strength, toughness, and (most importantly) weldability. Tests are performed under the auspices of Lloyd's register. We supply our offshore plates in thicknesses up to 101.6 mm in steel grades up to S460G2+M, prequalified according to EN10225. We supply our offshore plates for arctic applications in steel grades up to API 2W-60 with guaranteed CTOD values down to -40°C, prequalified according to API RP2Z.

toughcore®

toughcore®

Go to Website

alform®

alform®

alform® ist ein warmgewalzter, hochfester TM-Stahl mit bester Schweißeignung und steht damit für höchste Bauteilsicherheit.

Go to Website