Steel Division

corrender

corrender is a zinc-magnesium-aluminum coating made by voestalpine.

Powerful protective layer


Excellent corrosion protectionA striking feature of corrender is the high-performance corrosion protection as opposed to conventionally galvanized steel strip. The significantly higher protective effect of corrender results in a thinner metallic coating of zinc.

Excellent workabilitycorrender also convinces through increased efficiency in processing and leads to a significant reduction in production costs. The potential can be utilized more effectively than ever before: Low zinc abrasion, excellent deep-drawing properties, low friction, the associated low oil consumption and very high profiling capacity all result in excellent processing properties.

High-performance alternativeThe superior corrosion protection of corrender opens up several options: new markets that require better protection with the same thickness or significant savings with the same protection.

Maximum advantage

Maximum protection

The excellent corrosion protection of zinc-magnesium coatings is well known. corrender takes it one step further. corrender is a perfectly coordinated coating that is superior to conventional zinc-magnesium coatings and provides a higher level of corrosion protection.

Maximum processability

voestalpine offers broad process expertise in production. In collaboration with process specialists, corrender was developed with a view to maximizing efficiency. The result is a product with the lowest zinc abrasion, excellent deep-drawing properties and maximum profiling.

Maximum experience

voestalpine is regarded as a pioneer in the production of zinc-magnesium-aluminum alloys on the European market. This success story began in 2007 with the serial supply of corrender. Numerous laboratory tests, worldwide exposure testing, large-scale plant trials and customer applications, experts at voestalpine have established comprehensive product understanding and specialist knowledge.

Steel grades and coating groups

corrender is available from ZM 70 g/m² to 310 g/m² and in all conventional steel grades used in the automotive industry. Products range from mild steels and bake-hardening grades to high-strength and ultra-high-strength steels.

Available dimensions

Tabelle corrender

Indicated values are standard references. Limitations are possible depending on thickness.

 

Salt spray test

The corrosion protection of corrender is significantly higher than that of conventionally galvanized steel strip, even in formed condition.

In heavily acidic environments and under alkaline stress, corrender also exhibits significantly increased protection.

voestalpine corrender - Salzsprühtest

Outstanding results of worldwide exposure tests

In order to demonstrate the performance of corrender under natural conditions, corrender samples and samples of conventionally galvanized steel were exposed in 14 different locations worldwide. These exposure tests were conducted in collaboration with the French Corrosion Institute to ensure that differing temperatures, precipitation volumes, humidity and pollution levels (SO2 and NO2) and distances to the ocean were taken into due consideration.

voestalpine corrender - weltweite Auslagerung

65% higher level of protection

After one year, corrender loses a significantly smaller amount of mass at each of the worldwide locations and thus higher protection against corrosion than conventionally galvanized steel strip. An average improvement of 65 % was determined across all the locations, whereas the protection level was increased by more than 80% at some of the places. The increased level of protection was not lower than 40% at any of the locations.

voestalpine corrender - höhere Schutzwirkung
voestalpine corrender - Tabelle zur höheren Schutzwirkung

During the design of the steel structure, compliance with all relevant instructions pertaining to protecting the structure from corrosion is mandatory (see Reference Sheet 121:2003 of the Steel Information Center, Corrosion Protection Systems for Sheet Steel Components and other instructions). Standing water, dripping moisture, impurities and contact corrosion must be avoided through composite construction.

Please note that no warranty or guarantee against corrosion damage can be derived from this table. Users shall be responsible for the planning and design of their steel structures (and corrosion protection).

 


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Steel strips

Hot-dip galvanized steel strip

Hot-dip galvanized steel strip

Hot-dip galvanized steel made by voestalpine is characterized by high corrosion resistance, excellent working properties and a wide spectrum of applications.

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Hot-dip galvanized steel strip

An excellent all-rounder

Hot-dip galvanized steel made by voestalpine is characterized by high corrosion resistance, high-quality appearance, excellent working properties and a wide spectrum of applications. The portfolio of steel grades ranges from super deep-drawing grades to grades with highest strengths (advanced high-strength steels). Depending on customer requirements, voestalpine supplies a comprehensive range of available widths and thicknesses with tailor-made metallic coatings. A variety of surface finishing treatments also make it possible to extend the range of applications. voestalpine supplies high-strength steels with unique exposed-panel quality and offers a ZF coating for this purpose. The world's only hot-dip galvanized press-hardening steels made by voestalpine round off the extensive portfolio.

Materials for cold forming

Some steel grades are available as galvanized hot-rolled strip:

  • Hot-rolled low-alloyed or microalloyed steels
  • Hot-rolled ferritic-bainitic steels
  • Hot-rolled complex-phase steels

Materials for hot forming

Press-hardening steels for hot forming are available in various strengths and are coated with zinc or zinc-iron. Best crash behavior, high dimensional accuracy and very good joining properties are the hallmarks of components made of these materials.

Metallic coatings

  • Zinc (Z) for applications subject to average corrosion (galvanized)
  • Zinc-iron (ZF) for corrosion protection with highest weldability requirements (galvannealed)
  • Zinc-magnesium (ZM) for best cathodic corrosion protection (corrender)

Metallic coatings Z and ZM are available with normal (N) and small spangles (M). The surface of zinc-iron coating is spangle-free. Upon customer request, voestalpine supplies different zinc coatings per side (differential galvanizing).

corrender is the high-performance zinc-magnesium-aluminum coating made by voestalpine.

This surface treatment provides excellent corrosion protection and processability, offering a high-performance alternative to conventional protective coatings for hot-dip galvanized steel strip. Corrender has been supplied in series since 2007, and voestalpine has established comprehensive product know-how and expertise in this area.

Coating
Thickness/mm
Width max./mm
Coating
Z and GI0.45 – 4.001730Z70 - Z600
ZF and GA0.45 – 2.301730ZF70 - ZF140
ZM (corrender)0.45 – 2.301730ZM90 - ZM200

"At the Linz site, we manufacture a very extensive product mix in five different hot-dip galvanizing lines. We apply zinc coatings in various surface qualities on mild to high-strength steel grades. Our team of specialists meets the challenge with a high level of commitment and quality awareness every single day. We set the standards with additional chromium-free and environmentally friendly treatments such as clearcover® or multiface®.

Maximilian Kaiser, Main Process Manager, Hot-dip Galvanizing

Surface quality

  • As-coated surface (A)
  • Improved surface (unexposed and B)
  • Best surface (exposed or C) for special requirements such as exposed panels (IF steels) in the automotive industry for additional benefits:
  • Minimum waviness
  • High contour sharpness in reflections
  • Also for ZM (corrender coatings)
  • Optimum forming properties
  • Efficient painting
Design for Z and ZM
Mean roughness value Ra [µm]
Standard0.6 – 1.9
Roughness: especially smooth0.5 max.
Roughness: smooth0.9 max.
Special option: half matt0.7 – 1.3
Special option: matt1.3 – 1.9

Numerous additional treatments

Subsequent surface treatment additionally improves the existing product properties in comparison to the high-quality base material and provides solutions to special applications:

  • Anti-fingerprint (multiface®) for the household appliance and construction industries
  • Chemical passivation and/or corrosion protection oils protect against white rust formation and are free of chromium. (clearcover®)
  • Forming aids such as a phosphating or passivation layer (dryform®)
  • Optimized tribology and excellent oil distribution (prelube2)
Zusatzbehandlungen - Übersichtsbild

Further processing

Hot-dip galvanized steel strips available in a wide range of widths and lengths:

  • Wide strip
  • Slit strip (slit)
  • Cut-to-length sheets
  • Blanks

Supply pursuant to EN 10346 and VDA 239100 Deviations upon agreement.


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