NON-ALLOY STRUCTURAL STEELS

They are defined according to minimum tensile strength values.

These steel qualifications that can be used for all applications of general construction industry are preferred particularly for their high strength, formability and weldability features.

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
S220GD+Z min. 220 min. 300 min. 30
S250GD+Z min. 250 min. 330 min. 19
S280GD+Z min. 280 min. 360 min. 18
S320GD+Z min. 320 min. 390 min. 17
S350GD+Z min. 350 min. 420 min. 16


Chemical Properties:

QUALITY C max Si max Mn max P Max S max Ti max
S220GD+Z 0.20 0.60 1.70 0.10 0.045 0.30
S250GD+Z 0.20 0.60 1.70 0.10 0.045 0.30
S280GD+Z 0.20 0.60 1.70 0.10 0.045 0.30
S320GD+Z 0.20 0.60 1.70 0.10 0.045 0.30
S350GD+Z 0.20 0.60 1.70 0.10 0.045 0.30
 

Surface Quality:

Two types of surface quality are available for hot dip galvanized non-alloy structural steels.

            A : The surface in the form it is coated

            B: Improved surface (temper rolling applied)

Surface feature is described with a letter following quality.

S250GD+Z100 A: denotes a 100 gr/m2 coated surface while S250GD+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

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.

Tolerans Class 

Nominal Width

 Nominal Thickness
<0,70 ≥0,70<1,20 ≥1,20
Normal ≥600<1200 15 13 10
≥1200<1500 18 15 13
≥1500 22 20 19
Special ≥600<1200 8 6 5
≥1200<1500 9 8 6
≥1500 12 10 9
 

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.

Thickness Tolerances:

Nominal Thickness Normal Tolerances for
Nominal Width

Special Tolerances (S) 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≤4,0 ±0,22 ±0,24 ±0,26 - - -


Width Tolerances:

Nominal Width Tolerances
Normal Special(S)
- + - +
≤1200 0 +5 0 +2
>1200 ≤1500 0 +6 0 +2
>1500 0 +7 0 +3


Length Tolerances:

Nominal Length Tolerances
Normal Special(S)
- + - +
<2000 0 6 0 3
≥2000 0 %0,30 x boy 0 %0,15 x boy