Metallic coated

High-strength steel

Our range of metallic coated high-strength steels includes micro-alloyed, phosphorus-alloyed and bake-hardening grades. Available with various corrosion-resistant coatings, they are ideal for applications requiring strength without a weight penalty. MagiZinc® Auto coatings optimise weight savings. Serica FLO® is our premium surface finish applied to hot-dip galvanised grades for exposed automotive panels.

Applications

  • Automotive components
  • Tubes

 

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

EN-Automotive-Product-Metallic coated-HSS-CR IF220 TSN

CR IF220-GI/GA/ZM
Specification details for CR IF220

EN-Automotive-Product-Metallic coated-HSS-All Grades OverviewTSE

Overview

Relationship with standards

  VDA standard European standard
Grade VDA 239-100 EN 10346: 2015
Phosphorus alloyed interstitial-free
CR IF220-GI/GA/ZM CR210IF-GI/GA/ZM HX220YD+Z/+ZF/+ZM
CR IF260-GI/GA/ZM CR240IF-GI/GA/ZM HX260YD+Z/+ZF/+ZM
Bake-hardening
CR BH180-GI/GA/ZM CR180BH-GI/GA/ZM HX180BD+Z/+ZF/+ZM
CR BH220-GI/GA/ZM CR210BH-GI/GA/ZM HX220BD+Z/+ZF/+ZM
CR BH260-GI/GA/ZM CR240BH-GI/GA/ZM HX260BD+Z/+ZF/+ZM
CR BH300-GI/GA/ZM CR270BH-GI/GA/ZM HX300BD+Z/+ZF/+ZM
Phosphorus alloyed
CR P220-GI - HX220PD+Z 1
CR P260-GI - HX260PD+Z 1
CR P300-GI - HX300PD+Z 1
Micro-alloyed
CR HSLA220-GI/GA/ZM CR210LA-GI/GA/ZM HX220LAD+Z/+ZF/+ZM 1
CR HSLA260-GI/GA/ZM CR240LA-GI/GA/ZM HX260LAD+Z/+ZF/+ZM
CR HSLA300-GI/GA/ZM CR270LA-GI/GA/ZM HX300LAD+Z/+ZF/+ZM
CR HSLA340-GI/GA/ZM CR300LA-GI/GA/ZM HX340LAD+Z/+ZF/+ZM
CR HSLA380-GI/GA/ZM CR340LA-GI/GA/ZM HX380LAD+Z/+ZF/+ZM
CR HSLA420-GI/ZM CR380LA-GI/ZM HX420LAD+Z/+ZM
CR HSLA460-GI/ZM CR420LA-GI/ZM -
CR HSLA500-GI/ZM CR460LA-GI/ZM -
1. Not in EN 10346:2015. Tata Steel’s own specification.

 

EN-Automotive-Product-Metallic coated-All Grades Coatings Surface aspectsTSE

Coatings and Surface aspects

Coatings

Three types of metallic coating are available:

  • Pure zinc. Galvanised steel (GI) is coated with an almost pure zinc coating (>99% zinc)
  • Zinc-iron alloy. Galvannealed steel (GA) is coated with a zinc coating containing approximately 8-12% iron
  • MagiZinc Auto. MagiZinc Auto steel (ZM) is coated with a zinc coating containing additional magnesium and aluminium.
     

Coating weight

Coating

Minimum

Maximum

Pure zinc (Z)

90 (6 µm/side)

600 (42 µm/side)

Zinc-iron (ZF)

90 (6 µm/side)

140 (10 µm/side)

MagiZinc (ZM)

70 (5 µm/side)

200 (14 µm/side)

Coating weight measured in g/m2 double-sided (µm, per side).
 

Surface condition

Surface condition complies with standard: EN 10346:2015. Galvanised steels are available in surface conditions with minimised spangle MB or MC. Galvannealed steels and MagiZinc Auto are available in surface conditions B or C.

Surface condition B: improved surface, suitable for unexposed parts

With this surface condition, 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.

Surface condition C: best quality surface, suitable for exposed parts

Surface condition C is obtained by skin passing. The controlled surface for the exposed side enables application of a uniform paint finish. The reverse surface has, at least, the characteristics of surface quality B.

Surface finish

Galvanised (GI) grades with surface condition MC are available with different levels of surface finish. For exposed body panels with stringent paint appearance requirements we offer ‘regular’ surface finish. For panels with the highest paint appearance requirements we recommend the premium surface finish Serica FLO®.

Surface roughness

Metallic coated steel for automotive applications can be supplied in various grades of roughness to comply with individual customer norms. If no roughness is specified, roughness will be as shown in the table below

Roughness Ra (µm)
cut off 0.8mm cut off 2.5mm
0.6 - 1.9 0.7 - 2.2
 

​​​Surface treatments

The surface treatments available are oiling and T-treatment.

Oiling (O)

The material surface can be oiled with preservative oil. Other types of oil - for increasing strength or reducing weight – are available to help achieve your optimum performance parameters. Please contact us for details.

Tata Steel offers the following range of oiling levels:

Coating type Oiling level
Pure zinc (GI) 0.25 - 1.5 g/m2
Zinc-iron(GA) 0.5 - 1.5 g/m2
MagiZinc Auto(ZM) 0.25 - 1.5 g/m2

Other oiling levels are available on request.
 

T-treatment

Please contact us for further information.

Prime Lubrication Treatment (PLT)

Prime Lubrication Treatment facilitates the manufacturing of stamped components by minimising known issues in stamping and joining.

For further information please visit our dedicate Prime Lubrication Treatment (PLT) page.

EN-Automotive-Product-Metallic Coated-HSS-CR IF220-Properties TSN

Properties

Properties


Mechanical properties

Metallic coated high-strength steel grades have the following mechanical properties (skin-passed) - these are measured transverse to the rolling direction. Property range is indicated according to EN 10346, but properties meet equivalent VDA 239-100 specifications also.

Interstitial-free steels
  Grade CR IF220
Coating type   GI/GA/ZM
Yield strength ReL N/mm2 220 - 280
Min. BH2 N/mm2 -
Tensile strength Rm N/mm2 340 - 420
Elongation % 32
Min. r-value r90   1.5
Min. n-value n90   0.17
Lower yield strength or 0.2% proof stress applies.
BH2 refers to the increase of 0.2% proof stress after heating (bake hardening). Not applicable for hot rolled substrate.
Elongation after fracture A uses test piece length L0 = 80 mm.
For galvannealed grades (GA) the minimum elongation before fracture is lowered by 2%.
For galvannealed grades (ZF) the minimum r90-value is lowered by 0.2.
 

Chemical composition

Tata Steel supplies the following cast analysis with maximum values unless otherwise shown:

Interstitial-free steels
  Grade CR IF220-GI/GA/ZM
C Max. 0.01
Mn Max. 0.9
P Max. 0.08
S Max. 0.025
Si Max. 0.2
Altot Max. 0.1
Ti Max. 0.12
Nb Max. 0.09
All values in weight%.

EN-Automotive-Product-Metallic Coated-HSS-CR IF220-Dimensions TSN

Dimensions

Dimensional capability
 

Galvanised (GI) products

Dimensions in mm.

Thickness Max. width
From - up to CR IF220
0.45 - 0.50 1350
0.50 - 0.55 1500
0.55 - 0.60 1640
0.60 - 0.65 1760
0.65 - 0.70 1830
0.70 - 0.75 1850
0.75 - 0.80 1880
0.80 - 0.90 1910
0.90 - 1.10 1970
1.10 - 1.20 1920
1.20 - 1.30 1870
1.30 - 1.40 1820
1.40 - 1.50 1720
1.50 - 1.60 1640
1.60 - 1.70 1570
1.70 - 1.75 1500
1.75 - 1.80 1460
1.80 - 1.90 1390
1.90 - 2.00 1330
For widths below 900 mm, please contact us.

 

Tolerances

Tolerances comply with standard EN 10143: 2006.
Tighter tolerances are available - please contact us for details.

EN-EngineeringAutomotive-Product-Metallic Coated-All Grades Shape and Dimensional TolerancesTSE

Shape and dimensional tolerances

Tolerances on thickness

The tolerances comply with standard EN 10143: 2006.
Tighter tolerances are available on request.
Thickness tolerance availability is shown below:

Thickness tolerance

Availability

Full thickness tolerance

Available

Special thickness tolerance

Available

50% of full thickness tolerance

Refer before ordering

 

The following tolerances apply to the grades with a minimum value for the yield strength lower than 260N/mm².

Nominal
thickness

Normal tolerances for a nominal width of 1 2

Special tolerances (S) for a
nominal width of 1 2

 

≤ 1200

> 1200

> 1500

≤ 1200

> 1200

> 1500

 

≤ 1500

 

 

≤ 1500

 

> 0.40

≤ 0.60

± 0.04

± 0.05

± 0.06

± 0.035

± 0.040

± 0.045

> 0.60

≤ 0.80

± 0.05

± 0.06

± 0.07

± 0.040

± 0.045

± 0.050

> 0.80

≤ 1.00

± 0.06

± 0.07

± 0.08

± 0.045

± 0.050

± 0.060

> 1.00

≤ 1.20

± 0.07

± 0.08

± 0.09

± 0.050

± 0.060

± 0.070

> 1.20

≤ 1.60

± 0.10

± 0.11

± 0.12

± 0.060

± 0.070

± 0.080

> 1.60

≤ 2.00

± 0.12

± 0.13

± 0.14

± 0.070

± 0.080

± 0.090

> 2.00

≤ 2.50

± 0.14

± 0.15

± 0.16

± 0.090

± 0.100

± 0.110

> 2.50

≤ 3.00

± 0.17

± 0.17

± 0.18

± 0.110

± 0.120

± 0.130

> 3.00

≤ 5.00

± 0.20

± 0.20

± 0.21

± 0.15

± 0.16

± 0.17

> 5.00

≤ 6.50

± 0.22

± 0.22

± 0.23

± 0.17

± 0.18

± 0.19

1. Around cold-rolled welds an increase of 20% at the most over the thickness tolerance is allowed
   over a length of 15 metres.
2. For zinc coatings ≥ Z450 the tolerance on the thickness must be raised by 0.02mm.

 

The following tolerances apply to the steel grades with a minimum value for the yield strength 260N/mm² ≤ Rp0.2 < 360N/mm² and for grades DX51D and S550GD.

Nominal
thickness

Normal tolerances for a nominal width of 1 2

Special tolerances (S) for a
nominal width of 1 2

 

≤ 1200

> 1200

> 1500

≤ 1200

> 1200

> 1500

 

≤ 1500

 

 

≤ 1500