HSLA220
Specification details for HSLA220

EN-Automotive-Product-Cold-rolled-HSS-All Grades OverviewTSE

Overview

Micro-alloyed grades

Micro-alloyed grades have high-strength levels through precipitation and grain refinement hardening. Careful use of alloying elements ensures high mechanical resistance and good weldability. Micro alloyed grades are suited to pressed or stamped parts that require high strength and good formability eg. in seating or body in white structural parts.

Tata Steel supplies high-strength micro-alloyed (HSLA) steel which complies with European standard EN 10268:2006+A1:2013 and to VDA 239-100.

Bake-hardening grades

Bake hardening steel gains extra strength after going through an automotive paint oven. The benefit of this is a product with relatively good formability, combined with a higher strength final part.

Rephosphorised grades

These grades deliver high mechanical resistance and good suitability for cold forming due to solid solution hardening by phosphorus. Our rephosphorised grades are highly suited to the manufacture of car body panels and structural components because of their good resistance to impact and fatigue.

Carbon manganese grades                                                                             

Our carbon manganese product combines high strength with excellent formability for the most difficult cold forming applications.
 

Applications

Automotive components.
 

Relationship with standards

Tata Steel can supply the following cold-rolled high-strength steel grades:

Micro-alloyed grades

Tata Steel VDA (L) EN 10268:2006+A1:2013 (T) EN 10268:1998 (L)
Grade Grade Grade Grade
HSLA220 CR210LA - -
HSLA260 CR240LA HC260LA H240LA
HSLA300 CR270LA HC300LA H280LA
HSLA340 CR300LA HC340LA H320LA
HSLA380 CR340LA HC380LA H360LA
HSLA420 CR380LA HC420LA H400LA
HSLA460 CR420LA HC460LA H460LA
 
L = longitudinal test direction, T= transverse test direction
Test direction can be specified
 

Bake hardening grades

EN 10268:2006+A1:2013 VDA 239-100
HC220B CR210BH

Rephosphorised grades

Tata Steel VDA SEW 094
Grade Grade Grade
P220 - ZSt E220P
P260 - ZSt E260P

Carbon manganese grades

Grade Grade
HC300CM No EN specified equivalent

The carbon manganese product is supplied to Tata Steel’s own standard.

EN-EngineeringAutomotive-Product-Cold-rolled-All Grades Surface aspectsTSE

Surface aspects

Surface quality

 

Surface quality A

Defects that do not influence the formability or the application of surface coatings are permitted. They are defects such as pores, minor scratches, slight indentations, small grooves or slight discolouration. 

Surface quality B

The better side must be free of defects that can spoil the uniform appearance of a high-quality paint or of an electrolytic coating. The other side must at least conform to surface quality A. Not all combinations of thickness and width are available in surface quality B. Please contact us for details. 

Inspected side

As a rule, the upper side of the strip is inspected; on request, the strip can be wound so that the inspected side is the underside.

 

Surface texture/roughness

Cold-rolled annealed and skin-passed steel is available in several surface textures. Unless specified otherwise, Tata Steel will supply normal roughness. The table below shows the range of surface textures according to EN 10130:2006.

 

 

Roughness Ra (µm)

EN 10130: 2006

Symbol

cut off 0.8 mm

extra-bright 1

-

≤ 0.3

bright

b

≤ 0.4

semi-bright

g

≤ 0.9

normal

m

0.6 - 1.9

rough

r

> 1.6

extra-rough 2

-

3.5 - 5

1. Not in EN 10130:2006 - Tata Steel’s own specification. Please contact us regarding the availability
2. Not in EN 10130:2006 - Tata Steel’s own specification, measured with a cut off of 2.5 mm
Other surface textures are available to meet your requirements - please contact us for details.

Preservative oil

The standard oil applied by Tata Steel acts as a protective coating. Other types of oil may be available to meet your requirement.
Tata Steel offers a range of oiling levels from 0.25 - 1.7 g/m2 per side.
Other oiling levels are available on request. Tata Steel is not responsible for the risk of corrosion during storage or shipment if material is ordered in the un-oiled condition.

Surface cleanliness

Tata Steel can guarantee improved surface cleanliness on request for batch-annealed products. The cleanliness is tested with a tape test, in which the loss of reflection is measured. The reflection gives an indication of the oil residue on the annealed product. Two levels of loss of reflectivity are available for batch annealed products: a maximum of 20% or a maximum of 30%. Continuously-annealed products typically exhibit a loss of reflection up to around 10%.

 

 

EN-Automotive-Product-Cold-rolled-HSS-HSLA220-Properties TSE

Properties

Properties


Mechanical properties

The available grades have the following mechanical properties - these are measured parallel to the rolling direction (longitudinal test pieces):
 

Micro-alloyed grades

VDA 239-100-16 Grade CR210LA
Yield strength Rp0,2 1 N/mm2 210 - 300
Tensile strength Rm N/mm2 310 - 410
Elongation 2 % 29
Min. r-value r90 3   1.0
Min. n-value n90   0.15
1. If the yield strength is pronounced (yield flag), the values apply to the lower yield point (ReL).
2. When thickness ≤ 0.7mm, the minimum value for elongation is reduced by 2%.
   Elongation after fracture A uses test piece length L0 = 80 mm.
3. For products with thickness > 2mm the minimum r90 is reduced by 0.2.
 

Chemical composition

Cold-rolled high-strength steels supplied by Tata Steel comply to the following cast analysis with maximum values unless otherwise shown:
 

Micro-alloyed grades

VDA 239-100-16 Grade CR210LA
C Max. 0.10
Mn Max. 1.00
Si Max. 0.50
P Max. 0.080
S Max. 0.030
Al Min. 0.015
Ti 1 Max. 0.15
Nb 1 Max. 0.10
1. These additional elements may be used individually or in combination where they appear in the definition of the steel within the composition limits indicated. Vanadium and boron may also be added. However, the sum of the contents of these four dispersoidal elements shall not exceed 0.22%.
All values are in weight%.