EN_US-Product-Cold-rolled-AHSS-All Grades OverviewTSUK

Overview

The good formability of our advanced and ultra high-strength steels (AHSS / UHSS) allows the user to increase the strength of the finished automotive components in body in white applications (BIW) by exploiting the high work-hardening characteristics. Substitution of high strength steel grades provides opportunities to reduce thickness while maintaining the in-service performance, resulting in potential cost and mass savings.

Dual phase grades

Cold-rolled dual phase steels allow you to increase the strength of the finished component or reduce the thickness of the steel - or both. By increasing product performance and helping reduce weight, these steels support you to achieve your optimum performance parameters. The use of dual phase grades increases the output from each tonne of steel and produces products that are strong, light and safe under load. High strain-hardening capacity ensures our dual phase steels have good formability.

Hot forming steel - 22MnB5

Our 22MnB5 product is an uncoated, ultra high-strength hot forming steel. It combines a strength level of 1500 N/mm² with excellent shape accuracy. Compared with conventional high-strength, low-alloy grades, 22MnB5 offers real opportunities for weight reduction through down-gauging. It also ensures good repeatability in long production runs when compared with cold press forming.

Applications

Body in white (BIW), structural and reinforcement components and lightweight structural seat components

Relationship with standards

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

Tata Steel	VDA	EN 10338: 2015	EN 10083: 2009
DP600	CR330Y590T-DP	HCT590X	-
DP800	CR440Y780T-DP	HCT780X	-
22MnB5	-	-	20MnB5 ¹

^1. This grade is also widely known as 22MnB5.

EN_US-Product-Cold-rolled-All Grades Surface aspects TSUK

Surface aspects

Surface quality according to ASTM A1008: 2013 and ASTM A568: 2011.

Surface quality class 1 (exposed):

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 unexposed.

Surface quality class 2 (unexposed):

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

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 with ‘Regular matte’ surface texture.

Description	Roughness µinch CLA
Regular matte	24 - 76

^{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, 37-241 mg/ft² per side. Please specify your exact requirements in the enquiry.
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 unoiled 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.
Continuously annealed products typically exhibit a loss of reflection up to around 10%.

EN_US-Product-Cold-rolled-AHSS-CR 22MnB5-Properties TSUK

Properties

Mechanical properties

The values shown for the mechanical properties in the table below are for test pieces taken parallel to the rolling direction.

As delivered	Grade	CR 22MnB5 Guaranteed	CR 22MnB5 Typical
Yield strength¹ R_p0.2	N/mm²	≥ 300	340 - 440
Tensile strength R_m	N/mm²	500 - 580	500 - 580
Elongation	%	≥ 20	> 21
r-value		-	0.90 - 1.0
n-value		-	> 0.150

Hot formed	Grade	CR 22MnB5 Guaranteed	CR 22MnB5 Typical
Yield strength 1 Rp0.2	N/mm²	1000 - 1250	1025 - 1100
Tensile strength Rm	N/mm²	1300 - 1600	1420 - 1520
Elongation	%	≥ 5	5 - 7

^1. Yield strength refers to the 0.2% proof strength for the product.
Elongation after fraction A uses test piece length L₀ = 80 mm.

Chemical composition

The table below shows the chemical composition to the draft EN 10338: 2015 (for dual phase steel) and EN 10083-3: 2006 (for hot forming steel) specifications.

		CR 22MnB5 Guaranteed	CR 22MnB5 Typical
	Grade	CR 22MnB5 Guaranteed	CR 22MnB5 Typical
C	Max.	0.23	0.22
Mn	Max.	1.3	1.2
P	Max.	0.02	0.01
S	Max.	0.010	0.005
Si	Max.	0.3	0.24
Al_tot		0.02 - 0.06	0.04
Cr + Mo¹	Max.	0.3	0.2
Nb + Ti ²	Max.	0.04	0.03
V	Max.	-	-
B	Max.	0.005	0.003

^1. Refers to Cr max for CR 22MnB5.
^2. Refers to Ti max for CR 22MnB5
All values are in weight%.

EN_US-Product-Cold-rolled-All grades Shape and dimensional tolerances TSUK

Shape and dimensional tolerances

Tolerances on thickness

Tata Steel can supply to full thickness tolerance specified in ASTM A568: 2015.
Thickness tolerances over, no tolerance under. Tighter tolerances are available as shown below:

Specified Width, in.	Thickness tolerances available
	ASTM A 568 (2019)
From - up to	To 15, incl	Over 15 to 72, incl	Over 72
To 0.014, excl	0.001	0.001	...
0.014 to 0.019, incl	0.002	0.002	...
Over 0.019A to 0.039, incl	0.003	0.003	0.003
Over 0.039 to 0.057,incl	0.004	0.004	0.004
Over 0.057 to 0.071,incl	0.005	0.005	0.005
Over 0.071 to 0.098, incl	0.005	0.005	0.006
Over 0.098 to 0.142, incl	0.005	0.006	0.007

Minimum thickness, 0.021 in. for high-strength, low-alloy.
The specified thickness range captions apply independent of whether the ordered thickness is stated as a nominal or minimum.
The tolerances provided in the table are based on minimum thickness (tolerance over, no tolerance under).
For nominal thickness, the tolerance is divided equally over and under.

Tolerances on width, edge camber and flatness

Material will be supplied conforming to the tolerances specified in ASTM A568 (2007) / A635 (2007).
Width tolerances are over, no tolerance under.

Width tolerances available
Specified Width, in.	ASTM A568: 2019
To 6, incl	Over 6 to 9, inc	Over 9 to 12, inc
0.012	0.016	0.032

0.020 in. minimum thickness for high-strength low-alloy.

Camber Tolerances available ASTM A568: 2019
Specified Width, in.
To 12, incl
1⁄4 in. in any 8 ft

0.020 in. minimum thickness for high-strength low-alloy.

Flatness tolerances Under Specified Yield Point, min, 45ksi ASTM A568: 2019
Specified Width, in.	Specified Thickness, in.
	To 0.044, incl	Over 0.044
to 36 incl	3⁄8	-
over 36 to 60 incl	5⁄8	-
over 60	7⁄8	-
to 36 incl	-	1⁄4
over 36 to 60 incl	-	3⁄8
over 60 to 72 incl	-	5⁄8
over 72	-	7⁄8

Flatness tolerances Under Specified Yield Point, min, 45 to 50 incl. ASTM A568: 2019
Specified Width, in.	Specified Thickness, in.
	To 0.044, incl	Over 0.044
to 36 incl	3⁄4	-
over 36 to 60 incl	1 1⁄8	-
over 60	1 1⁄2	-
to 36 incl	-	3⁄4
over 36 to 60 incl	-	3⁄4
over 60 to 72 incl	-	1 1⁄8
over 72	-	1 1⁄2

Maximum deviation from a horizontal flat surface
Tolerances for high-strength, low-alloy steel with specified minimum yield point in excess of 50 ksi are subject to negotiation.

Dimensions and coil weights

Tata Steel can supply hot-rolled steels with the following minimum and maximum dimensions and weights.

Description	Availability
Coil diameter inner	24 inch
Coil diameter outer	83 inch max.
Coil weight	66,000 Ibs max.
	Coil weight limited by maximum outer diameter
	Maximum weight allowed by road/rail transport
	Some products may have different coil weight ranges available
Minimum tonnage per order	Refer to price list for order quantity details
Minimum tonnage per order	Minimum order quantities may apply