Amstrong® 420MC Laser Sheet – Precision Cutting for High-Quality Applications

The Amstrong® Laser sheet range comprises hot rolled steel grades developed for applications using computer-controlled thermal and mechanical cutting equipment (laser, plasma etc). The sheets are cut to length from ArcelorMittal coils for laser applications on certified lines that are able to reduce internal stresses and improve flatness before, during and after cutting.

All these grades are designed to:

Give improved productivity, quality and consistency with laser cutting

Meet the most stringent flatness requirements after cutting

Amstrong® Laser sheets are virtually free of internal stresses and can therefore be used to produce sheets with guaranteed flatness before, during and after cutting.

Properties

General

Property	Value	Comment
Carbon equivalent (CEV)	0.38 [-]	max.

Mechanical

Property	Temperature	Value	Comment
Charpy impact energy	-20 °C	40 J	min. \| for thickness 6-16 mm
Elongation		17 %	min. \| for thickness < 3 mm \| Transverse, A80
		18 %	min. \| for thickness < 3 mm, A80
		21 %	min. A5.65√So \| for thickness 3-16 mm \| Transverse
		22 %	min. A5.65√So \| for thickness 3-16 mm
Tensile strength		490 - 600 MPa	for thickness < 16 mm
		500 - 600 MPa	for thickness < 16 mm \| Transverse
Yield strength		420 - 520 MPa	for thickness < 16 mm
		450 - 550 MPa	for thickness < 16 mm \| Transverse

Chemical properties

Property	Value	Comment
Aluminium	0.015 %	min.
Carbon	0.11 %	max.
Manganese	1.5 %	max.
Niobium	0.065 %	max.
Phosphorus	0.02 %	max.
Silicon	0.03 %	max.
Sulfur	0.012 %	max.
Titanium	0.15 %	max.
Vanadium	0.2 %	max.

Technological properties

Property

Application areas

These sheets are particularly suitable for manufacturing complex parts or for improving productivity.

Chemical composition

The chemical properties given are based on cast analysis data.

Delivery condtion

These sheets may be delivered from coils produced in the different grades shown below.

Other

Thickness tolerance The consistent thickness and reduced internal stresses make it possible to operate laser cutting machines continuously by lowering the breakdown risk and the frequency of laser cutting head breakage. This allows the use of fully automated loading and discharging systems.

The following thickness tolerances (EN 10051:2010) are available: 1/2 or 1/3 for both mill finish and pickled steels.

Flatness tolerance

Two products are available, depending on the level of guarantee required:

Laser Classic

Laser Premium

All the types of guarantee available are summarised in the following table:

	Laser Classic	Laser Premium	Side trimmed*
For sheets	Maximum deviation: the minimum value, depending on the circumstances, between 4 mm/m or 8 mm/2 m or 12 mm/3 m and the special tolerances in EN 10051:2010	Maximum deviation: the minimum value, depending on the circumstances, between 3 mm/m or 6 mm/2 m or 9 mm/3 m and the special tolerances in EN 10051:2010	Min width	Max width
On cut parts	Maximum deviation of 5 mm over a length of 1 m	Maximum deviation of 3 mm over a length of 1 m	595	1640
Please contact us for other dimensions. *Smaller widths are available after slitting.

Dimension tables

Cut-to-length sheets will be produced from coils of steels for laser cutting applications and/or from steels in the Amstrong® range. Since the dimensions available are linked to the cutting line, contact our commercial teams for further information on the sheets produced on the line in question.

Surface condition

Laser cutting speed largely depends on surface homogeneity and reflectivity. To improve productivity for our clients, ArcelorMittal has developed several surface finishes compatible with laser cutting:

Mill finish:

Surface appearance: only A (unexposed) is available

Surface cleanliness: Amstrong® Laser sheets are delivered with an improved surface finish. Contact our commercial teams for further information.

Pickled:

ArcelorMittal's hydrochloric acid pickling process produces a clean, more favourable surface for laser cutting than that produced by sulphuric acid pickling.

Surface appearance: A (unexposed) and B (exposed) are available

Protection:

Protective oil may be applied
Easyfilm® HPE is available. It offers more uniform dry surface protection than oil and favourably reduces the reflectivity of the steel. Moreover, since no oil is used, workplace floors are cleaner and safer. For more information, see data sheet A80.

Welding

With the ArcelorMittal steels used to produce these sheets for laser cutting applications, excellent weldability is expected.

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Metal