Hot-dip galvanized

Steel coated with zinc or hot galvanized EN10346: 2009

AREAS OF IMPLEMENTATION

  • Air-conditioning

  • Refrigeration

  • Automotive

  • Poultry industry

  • Dryers

  • Elevators

  • Household appliances (refrigerators, washing machines, dishwashers, kitchen, bath tubs, showers, water heaters, etc ...)

CHARACTERISTICS

These products consist of a steel substrate on which is applied a coating of continuously hot-dipped zinc. The percentage of zinc contained in the coating is greater than 99%. The main characteristic of these products lies in the remarkable corrosion resistance given by zinc according to the thickness of the coating; the hot dipping allows for a wide range of thicknesses of zinc, even very high, up to 600 g/m2 total on both sides:

Coating nomination

Minimum weight1)

g/m2

Typical coating thickness values to the face in a single spot test

micron

Density

g/cm3

 

Triple_spot_test

Single_spot_test

Typical value

Range

 

Weight of zinc coating (Z)

Z100

100

85

7

5-12

7,1

 Z140

140

120

10

7-15

 Z200

200

170

14

10-20

Z225

225

195

16

11-22

Z275

275

235

20

15-27

Z350

350

300

25

19-33

Z450

450

385

32

24-42

Z600

600

510

42

32-55

1) I g/m2 including both surface

 

They can be supplied with special requirements of the coating, surface quality and surface protection.

The coating finish can be in two types:

COATING FINISH

N

NORMAL: consists of large, regular, bright spangle

M

MICROSPANGLE: presents reduced spangle size and in some cases it is not visable to the naked eye, thanks to the antimony content and the extremely controlled cooling process

The spangle size and appearance, as well as its brightness, does not affect the quality of the coating; however, if a particular requirement is needed in terms of size or brightness of the spangle, it is absolutely necessary that this is specified when ordering.

Surface appearance can be either A, B or C, unless otherwise requested when ordering, the material comes with appearance A.


SURFACE APPEARANCE

A

Some small imperfections are possible such as small pits, variations in the size of the spangle, dark spots, light scratches and passivation marks

B

It is obtained by skin-passing. With this type of surface imperfections such as scratches are possible due to the passing process, streaks, irregularities but not cavities

C

Obtained by skin-passing. The best undamaged surface, the obvious uniformity of a high class finish; the other surface must be at least of type B.

There are various types of surface protection and must be properly indicated in the order:

SURFACE PROTECTION

C

Chemical passivation, traditionally chromium based; also available free of hexavalent chromium in accordance with the RoHS Directive; yellowish residue may be found on the surface but it does not alter the product characteristics

O

Oiled using oils that can be removed during greasing without compromising the coating

CO

Combination of oiling and chemical passivation to improve protection against corrosion

S

Organic passivation, commercially indicated with AFP (Anti Finger Print) or SPT (Resin Coating), consisting of a polymer film containing corrosion inhibitors; available free of hexavalent chromium; improves protection against corrosion, prevents the formation of imprints, facilitates scrolling during processing and behaves as a painting primer

P

Phosphation, particularly suitable for the application of a subsequent layer of paint

PO

Combination of phosphation and oiling to improve formability

U

Without any protection, under the full responsibility of the customer

Whatever form of surface protection is implemented it is very important that, during transport and storage, galvanized materials avoid, as much as possible, contact with moisture or water and are kept in a dry environment.

These steels are available with a wide range of characteristics, from commercial quality (DX51D) to those for deep drawing (DX54D and DX56D), to construction products (S250GD) and high strength (HX340LAD), as well as special and innovative products (such as dual phase steel).