Our roll-bonded plates and heads are used in chemical apparatus engineering and refineries, in the oil and gas industry, in oil sand processing (coke drums) and in the food industry. Clad plates are used in seawater desalination and flue gas desulfurization systems.

Materials

A roll-clad sheet or plate consists of a base and a coating layer material.

The base materials for our clad plates come 100% from our own steel production in Linz. Cladding materials are purchased in the form of slabs and plates from renowned manufacturers.

The base materials used are primarily structural steels, boiler and pressure vessel steels and fine-grained structural steels that are characterized by good weldability and workability.

As cladding materials, we supply ferritic and austenitic stainless steels, nickel and nickel-based alloys, copper and copper-nickel alloys that are characterized by their respective corrosion properties.

Further details can be found in the brochure linked below.

The surfaces of the base materials are usually supplied in as-rolled condition or are sandblasted.

The surface of the cladding material is usually ground. We supply ground with grain 80 as a standard. Further grindings can be supplied upon request.

Here you will find more detailed information about delivery conditions and certifications for clad plates.

Available dimensions

Sourgas resistant plates for tubes

Sourgas occurs in oil and gas production and is considered highly corrosive. Only the best materials can withstand this aggressive medium. As one of the leading suppliers of sourgas-resistant linepipe plates worldwide, we supply roll-bonded linepipe plates with corrosion-resistant cladding for this specific application.

Protective cladding

The base material is decisive in linepipe production. Our roll-clad plates exhibit high strength, good toughness and best corrosion protection as a result of the cladding material. The combination of the X65 product with nickel-based alloy 625 achieves these optimized properties in the material. Our partners process the material into metallurgically bonded linepipe.

Quality defies the elements

The metallurgical bond of the clad linepipe withstands the highest mechanical stress and dynamic loads. These pipes are ideally suited for use in deep-sea pipelines under corrosive conditions.

Reeling and riser pipes 

• Roll clad plates for pipelines 
• High corrosion resistance, even for the most demanding sourgas requirements 
• Reeling of pipelines more efficient and cheaper than welding on board 
• Roll-bonded plates for metallurgically bonded linepipe to vertical pipelines (risers) 
• Excellent metallurgical properties of roll-bonded plates for highest compressive strength

Specializing in extreme conditions

Lowest arctic temperatures, highest pressure in the deep sea, acidic media: Even the most adverse conditions cannot harm our linepipe plates. Our plates can be found at depths of up to 3000 meters below sea level as sourgas-resistant linepipe plates or as land pipelines with a diameter of up to 48" (1220 mm). The highest sourgas requirements are met by our roll-bonded linepipe plates with corrosion-resistant cladding. As specialists in modern thermomechanical rolling processes with accelerated cooling, we are one of the world market leaders in linepipe plates. More than 2 million tons of sourgas-resistant linepipe plates and extremely tough linepipe plates for thick-walled deep-sea pipelines are ample proof of our product success.

Eddy current testing system successfully developed and approved

The oil and gas industry identified local hard zones (LHZ) as the root cause for Sulphide-Stress-Cracking (SSC) failures of carbon steel in severe sour service application representing zone 3 and beyond of the NACE diagram.

The characteristics of the local hard zones are that they reach hardness levels well above the typical base material hardness with a very low thickness (only several 0,1mm). The frequency of occurrence of such local hard zones is very low and random. 

Demonstrating the absence of these local hard zones becomes one of the focal points of the industry. Based on the long lasting in-house experience for eddy current at voestalpine a highly automated testing system was developed and accredited by different oil and gas majors.

The magnetic field of the eddy current of the material represents material properties (magnetic hard vs. magnetic soft). A change of the material property caused by e.g. a local hard zone is detectable and can be identified.

At voestalpine the motorized equipment follows the plate surface by meander with an automated tracking. The coverage of the plate surface is 100% with an overlap from one track to the next. Due to the automated tracking an automated examination report with exact and automated localization of indications is created and recorded.

The Probability of detection (POD) based on different mathematical models and therefore the sensitivity of the system was demonstrated to different oil and gas majors. Additionally the best repeatability of detecting local hard zones were highlighted.

Voestalpine has a track record of more than 2,4 Mio tons of delivered plates for sour service application. For more than 340.000 tons of plates for commercially use for sour service (representing almost 15% of the delivered quantity) this highly automated testing system has been utilized.

Steel grades

Dimensions

Our linepipe plates are thermo-mechanically rolled and accelerated-cooled. All grades are available upon request in sourgas-resistant design at pH3 or pH5 pursuant to NACE TM 0284 Solution A and B. All steel grades are available with notched bar impact testing and Battelle testing (BDWTT) at temperatures below 0 °C. HIC tests for sourgas applications upon request.