Grade 40
Specification details for Grade 40

EN_US-Engineering-Product-Metallic coated-All Grades Coatings Surface aspectsTSE

Surface aspects

Surface Aspects

Surface quality

Surface quality complies with ASTM standards A653: 2008 and A924: 2009. The products can be delivered with the following coating/surface types:

Minimized spangle (standard surface)

Imperfections such as pimples, marks, scratches, pits, variations in surface appearance, dark spots, stripe marks and light passivation stains are permissible.

Stretch levelling breaks or run-off marks may appear. Coil breaks and stretcher strains may also appear.

Minimized spangle temper rolled (improved surface)

With this surface quality, small imperfections such as stretch levelling breaks, skin pass marks, slight scratches, indentations, surface structure, zinc run-off marks and light passivation stains are permissible.

Extra smooth (best surface, exposed)

Surface quality is obtained by skin passing. The controlled surface shall make it possible to apply a uniform high-class paint finish. The other surface shall at least have the characteristics of surface quality B. As a rule, the upper side of the strip is inspected; on request the strip can be turned over so that the underside is the inspected side.

MagiZinc® is currently only available with standard or improved surface qualities.

Surface roughness

Metallic coated steel will normally be supplied with a regular matte finish:

Description Roughness µinch CLA
regular matte 30 - 61

Surface treatments

The surface treatments available are O, C and CO.

Oiling (O)

The material surface can be oiled with preservative oil. Other types of oil may be available to meet your requirement – please contact us.

Tata Steel offers the following range of oiling levels for all coating types:

Lightly oiled:  55 mg/ft2 per side
Regular oiled:  110 mg/ft2 per side

Other oiling levels are available on request. If no amount is indicated in your specification, a regular amount of oil will be applied.

Chromium-free passivation (C)

This surface treatment temporarily protects the zinc coated material against white rust during transportation and storage (not applicable to all qualities – please consult us).

Chromium-free passivation and oiled (CO)

Please request this combination of surface treatments if you require extra protection against white rust formation (not applicable to all qualities – please consult us).

 

Please contact us on the availability of other surface treatments.

 

EN_US-Engineering-Product-Metallic coated-Structural steel-Grade 40-Properties TSE

Properties

Properties


Mechanical properties

Galvanized structural steel has the following mechanical properties - these are measured parallel to the rolling direction:

ASTM A653: 2022 Min. yield
strength
Min. tensile
strength
Min. elogation
after 2 inch
SS Grade ksi ksi %
Grade 40 40 55 16

Chemical composition

Tata Steel supplies the following heat analysis with values in weight percentages:

ASTM A653: 2022 SS Grade Grade 40
C Max. 0.25
Mn Max. 1.35
P Max. 0.1
S Max. 0.04
Cu Max. 0.25
Ni Max. 0.2
Cr Max. 0.15
Mo Max. 0.06
V Max. 0.008
Cb Max. 0.008
Ti Max. 0.025

EN_US-Engineering-Product-Metallic coated-Structural steel-Grade 40-Dimensions TSE

Dimensions

Dimensions

Galvanized dimensional capability.

Dimensions in inches.

Thickness Max. width
from - up to Grade 40
0.014 - 0.016 -
0.016 - 0.018 -
0.018 - 0.020 60
0.020 - 0.022 60
0.022 - 0.024 62
0.024 - 0.026 66
0.026 - 0.028 68
0.028 - 0.030 69
0.030 - 0.035 70
0.035 - 0.040 72
0.040 - 0.045 72
0.045 - 0.060 73
0.060 - 0.065 72
0.065 - 0.070 61
0.070 - 0.080 61
0.080 - 0.100 59
The minimum width is 36 inch.
Please contact us for the availability of  lower widths

MagiZinc® dimensional capability.

Dimensions in inches.

Thickness Max. width
From - up to Grade 40
0.016 - 0.018 -
0.018 - 0.020 60
0.020 - 0.024 60
0.024 - 0.030 60
0.030 - 0.035 61
0.035 - 0.047 61
0.047 - 0.063 61
0.063 - 0.079 60
The minimum width is 36 inch.
Please contact us on the availability lower widths and for thicknesses in the range 0.079 - 0.098.
 

Tolerances on thickness

The tolerances comply with standard ASTM A924: 2022.
Tighter tolerances are available on request.

EN_US-Engineering-Product-Metallic coated-All grades Shape and dimensional tolerancesTSE

Shape and dimensional tolerances

Shape and dimensional tolerances

Tolerances on thickness

The thickness tolerances comply with standard ASTM A924: 2013 – 1 inch minimum edge distance.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified thickness Normal tolerances for a specified width of
From - up to 0 - 32 32 - 40 40 - 60 60 - 75
0.000 - 0.023 0.003 0.003 0.003 0.003
0.023 - 0.043 0.004 0.004 0.004 0.004
0.043 - 0.061 0.005 0.005 0.005 0.005
0.061 - 0.075 0.006 0.006 0.006 0.006
0.075 - 0.101 0.01 0.012 0.012 0.014
0.101 - 0.187 0.012 0.012 0.014 0.014

Around cold-rolled welds an increase of 20 % at the most over the thickness tolerance is allowed over a length of 50 ft.
Thickness tolerance availability is shown below:

Thickness tolerance Availability
Full thickness tolerance Available
Special thickness tolerance Refer before ordering
50% of full thickness tolerance Refer before ordering

Tolerances on width

The tolerances for width comply with standard ASTM A924: 2013.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified width Tolerances for a specified width of
From - up to Mill edge Cut edge
30 - 48 0.71 0.187
48 - 60 0.71 0.25
60 - 75 0.71 0.312

MagiZinc® is not included in the standard. Tighter tolerances are available on request.

Dimensions and coil weights

Description Capabilities
Inside diameter standard 24 inches, 20 inches on request
Outside diameter maximum 98 inches and at the most
  10/7 x width
Coil weight maximum 66.000 lbs.
PIW: width ≤ 47 868 - 1232 PIW
PIW: 47 inch < width ≤ 67 inch 868 - 1215 PIW
PIW: width > 67 inch 616 PIW and 868 - 1215 PIW

Coating layer

Coating layer Coating weight total both sides
  oz/ft2
G30 0.3
G35 1 0.35
G40 0.4
G60 0.6
G75 1 0.75
G90 0.9
G115 1.15

1. not in ASTM A653: 2008.
Other coating weights are available. Please contact us to discuss your requirements.