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TK Steel

Division Auto ­ Vertrieb/Engineering

Zinc-nickel coated sheet NEURALYT ® ZN For auto outer parts

Applications

Electrolytically zinc-nickel coated sheet NEURALYT ® ZN from ThyssenKrupp Steel was specially developed to provide excellent corrosion protection as well as good processability. The uniformity of the coating and the outstanding properties of the surface make zinc-nickel coated sheet NEURALYT ® ideal for auto outer parts. The coating thickness is 2 to 7 m depending on the corrosion loads on the part. This thin coating means that stampings can be shipped throughout Europe in the unpainted condition and without additional anticorrosion oiling.

Example of the microscopic structure of zinc-nickel coated sheet in vertical section

Technical features

Coating process NEURALYT ® is an electrolytically zinc-nickel coated sheet product. Thanks to special process control in the electrolytic coating line the nickel content of the coating is set at 12 %. The mechanical properties of the base metal are slightly affected by the electro-deposition of the coating in terms of elongation and r- and n-values. Steel grades Zinc-nickel coated sheet NEURALYT ® is available on request in various grades of deep-drawing steels, high-strength IF steels, microalloyed steels and bake hardening steels. Other steel grades and steels to European standards and delivery conditions can be supplied by arrangement.

Product information Zink-nickel coated sheet

Updated: September 2008

Page 1 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

Zinc-nickel coating The standard coating is 5 m (37.0 g/m2). Other coating thicknesses between 2 and 7 m can also be produced without difficulty. Coating weights and types of surface treatment are specified in EN 10271.

Coating weights (nominal values)

One- or two-sided (per side) 15 g/m 2 = 2 m > 15 22 g/m 2 = > 2 3 m > 22 30 g/m 2 = > 3 4 m > 30 38 g/m 2 = > 4 5 m > 38 44 g/m 2 = > 5 6 m > 44 50 g/m 2 = > 6 7 m

Surface quality Two types of qualities are available for zinc-nickel coated sheet NEURALYT ®: A = normal surface B = best surface

Surface treatment and protection On request, zinc-nickel coated sheet NEURALYT ® can be supplied with oiled, Prelube or Drylube treatments

Tolerances Dimensional and shape tolerances to EN 10131

Product information Zink-nickel coated sheet

Updated: September 2008

Page 2 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

Information on application and processing

Forming All common forming processes used for cold-rolled sheet can be used for zinc-nickel coated sheets if die geometry and surface are matched to these materials. The zinc-nickel coating in conjunction with the surface topography of the cold rolled steel has an influence on the tribology of the forming process. The characteristic parameter is the coefficient of friction . At ThyssenKrupp Steel, the coefficient of friction is determined in the strip drawing test between plane parallel tools. Compared with uncoated sheet (0.14 KB 0.18), zinc-nickel coated sheet has a lower mean coefficient of friction (0.12 ZN 0.15). The scatter band results from the roughness spectrum, which is set in production to customer requirements. To avoid coating abrasion, which tends to occur more when forming with short cycle times, the die surface must be completely smooth. ThyssenKrupp Steel measures abrasion using the strip drawing test with drawing bead. Zinc-nickel coated sheet displays higher abrasion rates (0.5 to 2.0 g/m 2) than uncoated sheet on which abrasion can also be measured (0.2 to 0.8 g/m 2). Joining All thermal and mechanical joining techniques can be used, as can adhesive bonding and sealing. However, the particular properties of the zinc-nickel coating require the processing parameters for some joining techniques to be adapted compared with uncoated sheet. Joining techniques which do not impair the surface, i.e. which preserve the anticorrosion properties of the coating, such as clinching and adhesive bonding are gaining in importance. However, the most frequently used joining methods are resistance, shield gas and laser beam welding. The preferred resistance welding processes in auto manufacture are spot welding, projection welding and roll seam welding. These processes are easy to automate, cause little surface damage or component distortion and do not require weld fillers. Compared with uncoated cold rolled sheet, a higher welding current and higher electrode force are needed when resistance spot welding NEURALYT ® ZN as the coating has a lower contact resistance. The welding current setting range is basically similar to that for pure zinc coatings and narrower than that for the uncoated base metal. The thermal loads are higher with NEURALYT ® ZN than with uncoated cold rolled sheet and there is a tendency for the electrode to alloy with the coating. However in terms of electrode life NEURALYT ® ZN performs much better than pure zinc coatings as the higher melting temperature and hardness and lower alloying tendency of the zinc-nickel coating compared with the pure zinc coating are more similar to those of uncoated cold rolled sheet.

Product information Zink-nickel coated sheet

Updated: September 2008

Page 3 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

A stepper control system and regular remilling of electrodes can further increase electrode life. In fusion welding, the coating metal burns in the weld area. To maintain the corrosion protection, a fusion welding method should be chosen which supplies as little heat input to the weld area as possible. One ideal method is laser beam welding. A slower welding speed than that used with cold rolled sheet improves degassing of the weld pool and avoids the formation of pores. When welding NEURALYT ® ZN sheet, welding fumes containing zinc, nickel and iron oxides are produced. The amount of fumes depends on factors such as the coating thickness and the welding process. Good workplace ventilation is essential. In unfavorable conditions, e. g. small rooms, direct extraction of the welding fumes is advised.

Comparison of welding current settings for different coatings (deep-drawing steel DC 04, t = 0.8 mm)

ThyssenKrupp Steel AG Kaiser-Wilhelm-Strasse 100, 47166 Duisburg Postal address: 47161 Duisburg Telephone: +49 (0) 203 52- 1, Telefax: +49 (0) 203 52 -25102 E-Mail: info.steel @ thyssenkrupp.com www.thyssenkrupp-steel.com

We are constantly updating our product informations. You can e-mail [email protected] to request the latest version. Authorized users of our KISS customer information and service system can also access the latest product overview at http://kiss.thyssenkrupp-steel.com. General Note: All statements as to the properties or utilization of the materials and products mentioned in this brochure are for the purpose of description only. Guarantees in respect of the existence of certain properties or utilization of the material mentioned valid are only if agreed upon in writing. Subject to technical changes without notice. Reprints, even extracts, only with permission of ThyssenKrupp Steel AG.

Product information Zink-nickel coated sheet

Updated: September 2008

Page 4 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

Available shapes and sizes

HX 180, BHZ 180, BHZ 220

Product information Zink-nickel coated sheet

Updated: September 2008

Page 5 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

Available shapes and sizes

MHZ 340, MHZ 420

Product information Zink-nickel coated sheet

Updated: September 2008

Page 6 of 7

TK Steel

Division Auto ­ Vertrieb/Engineering

ThyssenKrupp Steel AG Kaiser-Wilhelm-Strasse 100, 47166 Duisburg Postal address: 47161 Duisburg Telephone: +49 (0) 203 52-0, Telefax: +49 (0) 203 52-25102 E-Mail: info.steel @ thyssenkrupp.com www.thyssenkrupp-steel.com

We are constantly updating our product informations. You can e-mail [email protected] to request the latest version. Authorized users of our KISS customer information and service system can also access the latest product overview at http://kiss.thyssenkrupp-steel.com. General Note: All statements as to the properties or utilization of the materials and products mentioned in this brochure are for the purpose of description only. Guarantees in respect of the existence of certain properties or utilization of the material mentioned valid are only if agreed upon in writing. Subject to technical changes without notice. Reprints, even extracts, only with permission of ThyssenKrupp Steel AG.

Product information Zink-nickel coated sheet

Updated: September 2008

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