STEELS SUITABLE FOR COLD FORMING

Steels in this group have a low carbon non-alloy structure. 

They are designed to be suitable for bending, drawing and deep drawing according to their mechanical features.

High corrosion resistances and surface features allow use of them in general risky internal/external part applications.

The fact that mechanical specifications do not show extreme deviations allow uniform production and optimum productivity.

There are 5 product groups described according to EN 10346.

DX51D+Z: For simple bending processes

DX52D+Z: For drawing processes

DX53D+Z: For deep drawing processes

DX54D+Z: For special deep drawing processes

DX56D+Z: For extra deep drawing processes

Technical Specifications:
 
Mechanical specifications are defined according to EN 10346.

Mechanical Specifications:

Quality Yield Strength (MPa) Tensile Strength (MPa) Elongation %A80
Hot Dip Galvanized Steels t≤3 t≤3 t≤3
DX51D+Z   270 – 500 min. 22
DX52D+Z 140 – 300 270 – 420 min. 26
DX53D+Z 140 – 260 270 – 380 min. 30
DX54D+Z 140 – 220 370 – 350 min. 36
DX56D+Z 120 – 180 270 – 350 min. 39
  
Chemical Properties:

Quality C Max Si Max Mn Max P Max S Max Ti Max
DX51D+Z 0.18 0.50 1.20 0.12 0.045 0.30
DX52D+Z 0.12 0.50 0.60 0.10 0.045 0.30
DX53D+Z 0.12 0.50 0.60 0.10 0.045 0.30
DX54D+Z 0.12 0.50 0.60 0.10 0.045 0.30
DX56D+Z 0.12 0.50 0.60 0.10 0.045 0.30
 
Surface Quality:

3 types of surface quality are available for hot dip galvanized steels that are suitable for cold forming.

            A : The surface in the form it is coated

            B: Improved surface (temper rolling applied)

            C: Visible surface
 
Surface feature is described with a letter following quality.

DX51D+Z100 A: denotes a 100 gr/m2 coated surface while DX51D+Z denotes group A quality surface.
 
Surface Roughness:
 
This steel family is classifed according to Ra roughness values:
 
In the form it is coated : 0,40 < Ra  ≤ 1,30 μm
Semi matt : Ra ≤ 0,90 μm
Normal   : 0,60 < Ra  ≤ 1,90 μm
Rough : Ra > 1,60 μm

 
Coating Amount:
 
Coating amounts are specified in the table.
 
Two Surfaces Total Coating Thickness Two Surfaces Min. Coating Thickness Weight (g/m2)
(g / m2 ) Triple Spot Test Single Spot Test
Z100 100 85
Z140 140 120
Z200 200 170
Z225 225 195
Z275 275 235

 
Surface Protection
 
Hot dip galvanized steels suitable for cold forming are produced by applying lubrication or passivation or both.
 
Lubrication reduces the risk of corrosion.
 
Chemical passivation protects galvanized steel surface against moisture and prevents formation of white rust.

 
Surface Smoothness
 
Surface smoothness can be given in two classes as normal and special in EN 10143 standard.
 
Tolerance Class Nominal Width Nominal Thickness
<0,70 ≥0,70<1,20 ≥1,20
                    Normal ≥600<1200 12 10 8
≥1200<1500 15 12 10
≥1500 19 17 15
                     Special ≥600<1200 5 4 3
≥1200<1500 6 5 4
≥1500 8 7 6

 
All dimensional tolerances are given in mm.
Dimensional Tolerances:
 
Dimensional Tolerances are defined by EN 10143 norm. Thickness, width and length tolerance tables are given below.

Nominal Thickness Normal Tolerances for
Nominal Width		 Special Tolerances for
Nominal Width
≤1200 >1200 ≤1500 >1500 ≤1200 >1200 ≤1500 >1500
≥0,25 ≤0,40 ±0,05 ±0,06 - ±0,03 ±0,04 -
>0,40≤ 0,60 ±0,06 ±0,07 ±0,08 ±0,04 ±0,05 ±0,06
>0,60 ≤0,80 ±0,07 ±0,08 ±0,09 ±0,05 ±0,06 ±0,06
>0,80 ≤1,00 ±0,08 ±0,09 ±0,10 ±0,06 ±0,07 ±0,07
>1,00 ≤1,20 ±0,09 ±0,10 ±0,11 ±0,07 ±0,08 ±0,08
>1,20 ≤1,60 ±0,11 ±0,12 ±0,12 ±0,08 ±0,09 ±0,09
>1,60≤2,00 ±0,13 ±0,14 ±0,14 ±0,09 ±0,10 ±0,10
>2,00≤ 2,50 ±0,15 ±0,16 ±0,16 ±0,11 ±0,12 ±0,12
>2,50 ≤3,00 ±0,17 ±0,18 ±0,18 ±0,12 ±0,13 ±0,13
>3,00 ≤4,00 ±0,22 ±0,24 ±0,26 - - -
(*) All Dimensional Tolerances are given in mm.

Width Tolerances:
Nominal Width Tolerances
Normal Special
- + - +
≤1200 0 +5 0 +2
>1200≥1500 0 +6 0 +2
>1500 0 +7 0 +3

Length Tolerances:
Nominal Length Tolerances
Normal Special
- + - +
<2000 0 6 0 3
≥1500 0 %0,30 x boy 0 %0,15 x boy