Metallic coated

High-strength steel

Our range of metallic coated high-strength steels includes micro-alloyed and bake-hardening grades. Available with various corrosion-resistant coatings, they are ideal for applications requiring strength without a weight penalty. Magizinc® coatings improve press shop yields, enable reduced coating thickness and optimise weight savings.  

Applications

  • Automotive components
  • Tubes

 

Machinery in the metallic coated blanking line
Product specification
High-strength steel is currently available in the following grades

EN_US-Product-Metallic coated-HSS-Grade 50 TSUK

Grade 50
Specification details for Grade 50

EN_US-Product-Metallic coated-All Grades Coatings Surface aspectsTSUK

Surface aspects

Surface Aspects

Surface quality

Surface quality complies with ASTM standards A653: 2022 and A924: 2022. 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:

DescriptionRoughness µinch CLA
regular matte30 - 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:  65 mg/ft2 per side
Regular oiled:  100 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).

 

EN_US-Product-Metallic coated-All grades Shape and dimensional tolerancesTSUK

Shape and dimensional tolerances

Shape and dimensional tolerances

Tolerances on thickness

The thickness tolerances comply with standard ASTM A924: 2022 – 1 inch minimum edge distance.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified thicknessNormal tolerances for a specified width of
From - up to0 - 3232 - 4040 - 6060 - 75
0.000 - 0.0230.0030.0030.0030.003
0.023 - 0.0430.0040.0040.0040.004
0.043 - 0.0610.0050.0050.0050.005
0.061 - 0.0750.0060.0060.0060.006
0.075 - 0.1010.0070.0080.01080.009
0.101 - 0.1870.0120.0120.0140.014

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 toleranceAvailability
Full thickness toleranceAvailable
Special thickness toleranceRefer before ordering
50% of full thickness toleranceRefer before ordering

Tolerances on width

The tolerances for width comply with standard ASTM A924: 2022.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified widthTolerances for a specified width of
From - up toMill edgeCut edge
30 - 480.710.187
48 - 600.710.25
60 - 750.710.312

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

Dimensions and coil weights

DescriptionCapabilities
Inside diameterstandard 24 inches, 20 inches on request
Outside diametermaximum 98 inches and at the most
 10/7 x width
Coil weightmaximum 66,000 lbs.

Coating layer

Coating layerCoating weight total both sides
 oz/ft2
G400.4
G600.6
G900.9

Other coating weights are available. Please contact us to discuss your requirements.

 

EN_US-Product-Metallic coated-HSS-Grade 55 TSUK

Grade 55
Specification details for Grade 55

EN_US-Product-Metallic coated-All Grades Coatings Surface aspectsTSUK

Surface aspects

Surface Aspects

Surface quality

Surface quality complies with ASTM standards A653: 2022 and A924: 2022. 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:

DescriptionRoughness µinch CLA
regular matte30 - 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:  65 mg/ft2 per side
Regular oiled:  100 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).

 

EN_US-Product-Metallic coated-All grades Shape and dimensional tolerancesTSUK

Shape and dimensional tolerances

Shape and dimensional tolerances

Tolerances on thickness

The thickness tolerances comply with standard ASTM A924: 2022 – 1 inch minimum edge distance.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified thicknessNormal tolerances for a specified width of
From - up to0 - 3232 - 4040 - 6060 - 75
0.000 - 0.0230.0030.0030.0030.003
0.023 - 0.0430.0040.0040.0040.004
0.043 - 0.0610.0050.0050.0050.005
0.061 - 0.0750.0060.0060.0060.006
0.075 - 0.1010.0070.0080.01080.009
0.101 - 0.1870.0120.0120.0140.014

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 toleranceAvailability
Full thickness toleranceAvailable
Special thickness toleranceRefer before ordering
50% of full thickness toleranceRefer before ordering

Tolerances on width

The tolerances for width comply with standard ASTM A924: 2022.
Thickness tolerances over, no tolerance under. Dimensions in inches:

Specified widthTolerances for a specified width of
From - up toMill edgeCut edge
30 - 480.710.187
48 - 600.710.25
60 - 750.710.312

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

Dimensions and coil weights

DescriptionCapabilities
Inside diameterstandard 24 inches, 20 inches on request
Outside diametermaximum 98 inches and at the most
 10/7 x width
Coil weightmaximum 66,000 lbs.

Coating layer

Coating layerCoating weight total both sides
 oz/ft2
G400.4
G600.6
G900.9

Other coating weights are available. Please contact us to discuss your requirements.