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