Dimensions
Product shapes
- Cut lengths in as-rolled or pickled condition.
- Heavy plates in as-rolled and shop-primed condition.
- Coils and slit strip by separate agreement.
Cut lengths with mill edges
| Steel grade |
Thickness mm |
Width mm |
Length m |
| Ruukki Laser 250 C |
2 - 15 |
1000 - 1860 |
2 - 12 |
| Ruukki Laser 355 MC |
2 - 15 |
1000 - 1860 |
2 - 12 |
| Ruukki Laser 420 MC |
2 - 13 |
1000 - 1860 |
2 - 12 |
Maximum width of each steel grade depends on the thickness.
Heavy plates
| Steel grade |
Thickness mm |
Width mm |
Length m |
| Ruukki Laser 250 C |
10-30 |
1901 - 3300 |
2 - 15 |
| Ruukki Laser 355 MC |
10-30 |
1901 - 3300 |
2 - 15 |
| Ruukki Laser 420 MC |
10-25 |
1901 - 3300 |
2 - 15 |
Maximum width of each steel grade depends on the thickness.
More detailed information on dimensions is provided in the following technical brochures:
Tolerances
Tolerances on dimensions and shapes - Cut lengths: thickness, width and length better than EN 10051. The tolerance guarantee on flatness is 3 mm/metre.
- Ruukki Laser cut lengths are delivered with the Dead Flat guarantee.
- Heavy plates: thickness, width and length: EN 10029. The tolerance guarantee on flatness is 3 mm/metre.
Download dimensional and shape tolerances for hot-rolled steels
Surface quality
Steel surface quality guarantees high quality laser cutting. The surface scale is thin, adhesive and even, resulting from the choice of alloying materials and optimisation of the manufacturing process. The surface quality of heavy plates meets EN 10163-2.
Cut lengths are delivered in as-rolled condition or pickled condition.
Download information about pickled strip products
Plates are delivered in as-rolled or shop-primed condition.
Download information about shop primed plates
Properties
Materials testing
Mechanical testing and sampling are mainly carried out in accordance with EN 10149-2 or EN 10025.
Ruukki Laser 250 C cut lengths comply with the requirements for S235J2C structural steel EN 10025-2:2004. Ruukki Laser 250 C heavy plates comply with the requirements for S235JRC structural steel EN 10025- 2:2004.
The standard steel grades S355MC and S420MC EN 10149 are the reference steels of Ruukki Laser 355 MC and Ruukki Laser 420 MC, respectively. By an exception of the standard requirements, the tensile test of heavy plates is carried out transverse to the rolling direction.
Mechanical properties
|
Thickness mm
|
Yield strength
ReH N/mm2 Minimum |
Tensile strength Rm MPa |
Elongation A5% Minimum
|
Impact strength
Longitudinal minimum
|
|
Cut length |
Heavy plate |
|
Cut length |
Heavy plate |
|
t °C |
Charpy V J |
Ruukki Laser
250 C |
2 - (3) |
|
240 |
360-460 |
|
23 1) |
-40 |
40 |
Ruukki Laser
250 C |
3 - 8 |
|
240 |
360-460 |
|
30 |
-40 |
40 |
Ruukki Laser
250 C |
(8) - 15 |
|
240 |
360-460 |
|
30 |
-20 |
40 |
Ruukki Laser
250 C |
|
10 - 30 |
240 |
|
360-460 |
29 |
+20 |
27 |
Ruukki Laser
355 MC |
2 - 15 |
10 - 30 |
355 |
430-530 |
430-530 |
24 2) |
-20 |
40 |
Ruukki Laser
420 MC |
2 - 13 |
10 - 25 |
420 |
490-590 |
490-590 |
21 3) |
-20 |
40 |
Impact strength is tested by the Charpy V impact test in accordance with standard EN 10045-1. The requirement values 40 J and 27 J mean tests carried out with 10 x 10 longitudinal standard test pieces. When testing thicknesses less than 10 mm, the width of the test pieces corresponds with the strip thickness and the requirement values decrease in direct relation to the surface area of the test piece. No impact tests are carried out for thicknesses less than 6 mm.
1) Elongation is guaranteed as A80 value ≥ 23 % for thicknesses 2 – (3) mm.
2) Elongation is guaranteed as A80 value ≥ 19 % for thicknesses 2 – (3) mm.
3) Elongation is guaranteed as A80 value ≥ 17 % for thicknesses 2 – (3) mm.
Chemical composition
|
Content % (ladle analysis)
|
| Steel grade |
C Maximum |
Si Maximum |
Mn Maximum |
P Maximum |
S Maximum |
Al Minimum |
| Ruukki Laser 250 C |
0.12 |
0.03 |
1.20 |
0.020 |
0.020 |
0.015 |
| Ruukki Laser 355 MC |
0.12 |
0.03 |
1.50 |
0.020 |
0.015 |
0.015 |
| Ruukki Laser 420 MC |
0.12 |
0.03 |
1.60 |
0.020 |
0.015 |
0.015 |
In addition, niobium (Nb), vanadium (V), titanium (Ti) and/or boron (B) may be used as an alloying element either singly or in combination.
Carbon equivalent (CEV)
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
| Steel grade |
CEV maximum |
CEV maximum |
|
Cut length |
Heavy plate |
| Ruukki Laser 250 C |
0.24 |
0.30 |
| Ruukki Laser 355 MC |
0.24 |
0.34 |
| Ruukki Laser 420 MC |
0.28 |
0.38 |
Prefabrication services
Wide flats from plate and strip
Wide flats from plate and strip are dimensionally accurate and ready for assembly. Wide flats speed up the manufacture of steel structures and avoid wasting of material.
Read more about cutting wide flats from plates and strip
Flat cut shapes
Flat cut shapes will decrease the throughput time of installation. The customer will receive the components ready for installation. So, unnecessary material and storing costs can be avoided. If ordered, the products are delivered as shop-primed, bevelled and bent.
Read more about flat cut shapes
Bevelling
Precision cut lengths and precision cut plates with a bevelled edge are components that can be delivered directly to the installation site, which saves time and reduces transport and storage costs. The dimensionally accurate groove ensures uninterrupted automated welding and fitting.
Read more about precision cut lengths and precision cut plates with bevelled edge
Bent plate products
Bent plate products are components that are ready to be delivered to the installation site, which is beneficial in terms of schedule as well as transport and storing costs. If needed, the products can be ordered as shop-primed, furnished with welding bevels, and cut to shape. Premarked matchmarks facilitate installation.
Read more about bent plate products
Processing instructions
Laser cutting
Ruukki Laser steels can be cut up to 20% faster than ordinary steels. The full capacity of equipment can be utilised during cutting. The uniform quality of these steels means cutting parameters can be maintained from one batch and delivery to another, ensuring stable operations and uniform cutting results. The cutting result is clean and burr-free. Cut products have a good appearance, are dimensionally accurate and can be easily separated from the plate blank. Ruukki Laser grades can also be perfectly cut by plasma or normal flame cutting or mechanical cutting.
Download information about mechanical cutting
Download information about thermal cutting and flame straightening
Forming
Formability is excellent. Exact dimensions improve the repeatability of bending. The bending angle remains exact because of low residual stresses and uniformity of spring back. Good workshop practices are required in successful forming. Worn tools, scratches on the steel surface and edge burrs all reduce forming quality.
Cut lengths. Minimum permissible bending radius, bending angle ≤ 90°
| Thickness mm |
2 - 2.5 |
(2.5) - 3 |
(3) - 4 |
(4) - 5 |
(5) - 6 |
(6) - 7 |
(7) - 8 |
(8) - 10 |
(10) - 12 |
(12) - 14 |
(14) - 15 |
| Smallest allowable inside bending radius mm: |
| Ruukki Laser 250 C |
1.5 |
1.5 |
2.0 |
2.5 |
3.0 |
5.0 |
5.5 |
7.0 |
8.5 |
10.0 |
11.5 |
| Ruukki Laser 355 MC |
0.5 |
0.7 |
1.0 |
1.5 |
2.0 |
3.5 |
4.0 |
5.0 |
6.0 |
7.0 |
8.0 |
| Ruukki Laser 420 MC |
1.2 |
1.5 |
2.0 |
2.5 |
3.0 |
5.5 |
6.5 |
8.0 |
9.5 |
11.0 |
– |
No limitations on bending direction.
Heavy plates. Minimum permissible bending radius, bending angle ≤ 90°
| Thickness mm |
10 - 12 |
(12) - 14 |
(14) - 16 |
(16) - 18 |
(18) - 20 |
(20) - 25 |
(25) - 30 |
| Smallest allowable inside bending radius mm: |
| Ruukki Laser 250 C |
12 |
14 |
16 |
18 |
20 |
25 |
30 |
| Ruukki Laser 355 MC |
9.5 |
11.5 |
13 |
14.5 |
16 |
- |
- |
| Ruukki Laser 420 MC |
12 |
14 |
16 |
18 |
20 |
- |
- |
No limitations on bending direction.
Download information about flanging and forming
Welding
Weldability using all welding methods is excellent. A wide range of heat input can be used. There is no need to use an elevated working temperature under normal workshop conditions. The use of low hydrogen welding consumables and welding methods is recommended.
Download information about welding
Download welding consumables guide
Heat treatment
Ruukki Laser 355/420 MC steels can be stress relieved at temperatures of 530–580 °C. Heat treating the steel to temperatures higher than 580 °C may reduce the strength of these steel grades. Ruukki Laser 250 C may be heat treated according to EN 10025-2.
| Steel grade |
Temperature °C |
Treatment time and cooling manner |
| Ruukki Laser 355 MC and |
530 – 580 |
2 minutes / millimetre thickness, minimum 30 minutes. |
| Ruukki Laser 420 MC |
(target 560) |
Slow cooling in the furnace. |
Ruukki Laser 250 C may be heat treated according to EN 10025-2.
Hot-dip galvanising
The hot-dip galvanising properties are good due to the low silicon and phosphorus content.
Order & delivery
Delivery condition
The Ruukki Laser 250 C steel grade is supplied in hot rolled (as rolled) condition. The symbol “C” in the designation stands for guaranteed flangeability.
The delivery condition of Ruukki Laser 355 MC and Ruukki Laser 420 MC is thermomechanical rolled (symbol “M”). The symbol “C” in the designation stands for guaranteed flangeability.
Inspection document
EN 10204:2004 Inspection certificate 3.1..
Download information about inspection documents
Delivery information
Cut lengths are marked with black ink and heavy plates with white paint. Die stamps are used only upon special request by the customer, because die stamping may impair laser cutting and bending. Markings on Ruukki Laser steels are minimised; cut lengths can even be delivered without markings. Cut lengths can be supplied pickled and oiled according to the production programme. Packing ensures the product reaches the customer in the desired condition. Packing also offers protection for temporary storage.
General delivery information can be found from documents Markings and packing, Ultra-sonic testing and General terms of sale.
Download information about markings and packing
Download information about ultrasonic testing
Download general conditions of sale