EN_US-Product-Cold-rolled-AHSS-All Grades OverviewTSUK
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-HCT780X-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.
| EN 10338: 2015 | Grade | HCT780X |
|---|---|---|
| Yield strength1 Rp0.2 | N/mm² | 450 - 550 |
| Tensile strength Rm | N/mm² | 780 |
| Elongation | % | 14 |
| Min. n-value (10% - Ag) | - | |
| Min. BH2 | N/mm² | 30 |
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 EN 10338: 2015.
| EN 10338: 2015 | Grade | HCT780X |
|---|---|---|
| C | Max. | 0.18 |
| Mn | Max. | 2.50 |
| P | Max. | 0.080 |
| S | Max. | 0.015 |
| Si | Max. | 0.80 |
| Altot | 0.15 - 2.00 | |
| Cr + Mo | Max. | 1.40 |
| Nb + Ti | Max. | 0.15 |
| V | Max. | 0.20 |
| B | Max. | 0.005 |
All values are in weight%.
EN_US-Product-Cold-rolled-AHSS-HCT780X-Dimensions TSUK
Dimensional capability - Continuously annealed (CA)
Order volumes may apply to some dimensions - please contact us for details.
Dimensions in mm.
| Thickness | Max. width |
|---|---|
| From - up to | HCT780X |
| 0.80 - 1.00 | 1200 |
| 1.00 - 2.00 | 1400 |
Minimum width is 900 mm.
Tolerances
Tolerances on shape and dimensions comply with standard EN 10131: 2006
Tighter tolerances are available, please contact us for details.
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 order quantities may apply |
EN_US-Product-Cold-rolled-AHSS-DownloadsTSUK
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