Dimensions
Surface quality A or B.
Widths with mill edges.
|
Litec 500DP+ |
Litec 600CP+
Litec 600DP+ |
Litec 800CP+
Litec 800DP+ |
Litec 1000DP+
|
Litec 1000CP+ |
| Thickness mm |
Width mm |
Width mm |
Width mm |
Width mm |
Width mm |
| 0.70 - 0.79 |
To be agreed
separately
for each order. |
1000 - 1260 |
- |
- |
To be agreed
separately
for each order. |
| 0.80 - 0.94 |
920 - 1290 |
1000 - 1210 |
- |
| 0.95 - 0.99 |
920 - 1290 |
1000 - 1290 |
- |
| 1.00 - 1.19 |
920 - 1410 |
1000 - 1290 |
1000 - 1210 |
| 1.20 - 1.24 |
920 - 1410 |
1000 - 1415 |
1000 - 1250 |
| 1.25 - 1.34 |
920 - 1520 |
1000 - 1390 |
1000 - 1250 |
| 1.35 - 1.49 |
920 - 1520 |
1000 - 1440 |
1000 - 1250 |
| 1.50 - 1.80 |
920 - 1520 |
1000 - 1445 |
1000 - 1250 |
| 1.81 - 2.00 |
1000 - 1520 |
1000 - 1445 |
1000 - 1250 |
| 2.01 - 2.19 |
1000 - 1520 |
1000 - 1250 |
- |
| 2.20 - 2.50 |
1000 - 1350 |
1000 - 1250 |
- |
Our service centres also provide other sheet and strip lengths, as well as processing options.
Tolerances
The tolerances on metal-coated sheet steel products manufactured by Ruukki are mainly in accordance with EN 10143:2006.
Products are delivered with the normal tolerances. Special tolerances can be agreed on separately at the time of order.
Download dimensional and shape tolerances for metal coated steels
Coating & surface
Coating materials
The zinc coating (Z) of Litec steels is lead-free, as a result of which the zinc crystallizes into a minimised, even spangle that meets high requirements set for appearance. Thanks to the good formability of lead-free coatings, the corrosion protection, for example, in areas which have been bent is good. The small spangle coating is designated by the letter M.
Galfan (ZA) is a zinc-aluminium alloy coating with an aluminium content of approximately 5%. This coating has better anticorrosive and forming properties than normal zinc coatings. The surface is uniform and smooth.
Galvannealed (ZF) is a zinc-iron alloy coating. It is produced by means of heat treatment and gives the zinc an iron content of about 10%. ZF coated steels are excellent for resistance welding applications and are designed for use in high-quality paint-coated products. The surface produced is greyish and matte.
Surface quality
Normal surface (A)
Flaws in the surface such as local roughness, imprints, scratches, small pits, variation in pattern size, dark spots, stripe marks and minor passivation stains are allowed. Run-off marks may appear.
Improved surface (B)
Improved surface (B) is obtained by skin pass rolling. Minor flaws in the surface, such as skin pass marks, minor scratches, small indentations, run-off marks and minor passivation stains are allowed.
Surface treatment
Chemical passivation or oiling is usually used to protect the surface against white rust, caused by moisture, during transport and storage.
Litec steels are usually delivered in the oiled condition (O) but chemical passivation (C) or both chemical passivation and oiling (CO) are available on request.
Should a customer so wish, the surface can also be left unprotected, but this is at their own risk.
Properties
DP steels
Dual-Phase (DP) steels are steels which have a multiphase microstructure consisting of a dispersion of hard martensite islands. Characteristic of these steel grades is low yield strength / tensile strength ratio (Rp/Rm). In particular, the level of strain hardening is high at the beginning of forming, as a result of which stretch forming properties are good.
CP steels
Complex-Phase (CP) steels are steels with a ferrite/ bainite matrix containing martensite. Precipitation hardening can be used, if necessary, to complement these strengthening phases. Thanks to the structure of these steels, the yield strength/tensile strength ratio (Rp/Rm) is significantly higher than that of DP steels. CP steels are the best choice for applications demanding high strength and small bending radius.
TRIP steels
TRIP (Transformation Induced Plasticity) steels have excellent formability. This makes them suitable for components with a complex shape and requiring high strength and good energy absorption capability. The excellent combination of high strength and formability of TRIP steels is the result of the phase transformation of the retained-austenite to martensite during the forming process.
Litec steels do not usually age but they bake harden at elevated temperatures.
Determination of bake hardening (BH2)
|
1. Plastic prestrain of 2 %.
2. Tensile test after heat treatment.
After prestrain of 2 % the test piece is heated at 170°C for 20 minutes. The tensile test is carried out after this.
|
 |
Mechanical properties and coatings
Testing direction is transverse to the rolling direction.
| Steel grade |
Yield strength
RP0,2 MPa Minimum |
Tensile strength
Rm MPa Minimum |
Elongation A80 % Minimum
Thickness mm |
Bake hardening
BH2 MPa Minimum 3) |
Coatings 4) |
|
|
|
≤ 0.50 |
0.50 - 0.70 |
> 0.70 |
|
|
| DP-steels |
|
|
|
|
|
|
|
| Litec 500 DP |
300 – 380 |
500 |
19 |
21 |
23 |
30 |
Z, ZA, ZF 5) |
| Litec 600 DP |
340 – 420 |
600 |
16 |
18 |
20 |
30 |
Z, ZA, ZF 5) |
| Litec 800 DP |
450 – 560 |
780 |
10 |
12 |
14 |
30 |
Z, ZA, ZF 5) |
| Litec 1000 DP |
600 – 750 |
980 |
6 |
8 |
10 |
30 |
Z, ZA 1), ZF 1) |
| CP-steels |
|
|
|
|
|
|
|
| Litec 600CP |
350 – 500 |
600 |
12 |
14 |
16 |
30 |
Z, ZA, ZF 5) |
| Litec 800CP |
500 – 700 |
780 |
6 |
8 |
10 |
30 |
Z, ZA, ZF 5) |
| Litec 1000CP |
700 – 900 |
980 |
3 |
5 |
7 |
30 |
Z, ZA 1), ZF 1) |
| TRIP-steels |
|
|
|
|
|
|
|
| Litec 700TRIP 1) |
430 – 550 |
690 |
19 |
21 |
23 |
40 |
Z |
| Litec 800TRIP 2) |
470 – 600 |
780 |
17 |
19 |
21 |
40 |
Z |
1) Supply of this steel grade must be agreed separately.
2) Under development.
3) Not guaranteed for ZF-coated steel grades.
4) Coating mass in compliance with standard EN 10346
5) The elongation value of ZF-coated products will be reduced by 2 units.
Chemical composition
| Steel grade |
Content % |
|
|
|
|
|
|
C Maximum |
Si Maximum |
Mn Maximum |
Al Maximum |
Cr+Mo Maximum |
Nb+Ti Maximum |
| DP steels: |
|
|
|
|
|
|
| Litec 500DP |
0.14 |
0.80 |
2.00 |
2.00 |
1.00 |
0.15 |
| Litec 600DP |
0.17 |
0.80 |
2.20 |
2.00 |
1.00 |
0.15 |
| Litec 800DP |
0.18 |
0.80 |
2.50 |
2.00 |
1.00 |
0.15 |
| Litec 1000DP 1) |
0.23 |
0.80 |
2.50 |
2.00 |
1.00 |
0.15 |
| CP steels: |
|
|
|
|
|
|
| Litec 600CP |
0.18 |
0.80 |
2.20 |
2.00 |
1.00 |
0.15 |
| Litec 800CP |
0.18 |
0.80 |
2.20 |
2.00 |
1.00 |
0.15 |
| Litec 1000CP 2) |
0.25 |
0.80 |
2.20 |
2.00 |
1.20 |
0.15 |
| TRIP steels: |
|
|
|
|
|
|
| Litec 700TRIP 1) |
0.32 |
2.20 |
2.50 |
2.00 |
0.60 |
0.20 |
| Litec 800TRIP 2) |
0.32 |
2.20 |
2.50 |
2.00 |
0.60 |
0.20 |
1) Supply of this steel grade must be agreed separately.
2) Under development.
Processing instructions
Welding
Recommended welding methods for Litec steels are resistance, laser and HF welding; arc welding can also be used for joining Litec steels. The welding parameters should be adjusted to match the chemical and mechanical properties of the Litec steel. DP and CP steels have relatively low alloying element contents and have generally good weldability. When choosing the welding parameters for TRIP steels, the higher alloying contents have to be taken into account.
When resistance welding Litec steels, the electrode force should be about 35–50% higher than that for low-carbon steel grades. An acceptable welding current range is larger at longer welding times, but too long welding times should be avoided. The tensile strength of the weld increases with increasing steel strength. Due to the higher carbon and alloy contents of Litec TRIP steels the weld hardness is high. The fracture properties of the joint can be improved by applying a pulsed welding current or by post-weld heat treatment. Multi-impulse welding may be used especially with higher thicknesses or with TRIP steels, independent of thickness.
Galfan-coated Litec steels can be welded using the same parameters as for hot dip galvanised steels. Galvannealed-coated Litec steels have a much larger welding current range and longer electrode life than corresponding HDG steels.
Litec steels are extremely suitable for laser welding but the formability of the weld is lower than that of the base material. Formability can be partly restored by, for example, laser post-weld heat treatment or local inductive heat treatment.
The figure below shows an example of the welding parameters for Litec 800DP and Litec 700TRIP steels.
Weld time
Litec 800DP welding lobe 1) |
Litec 700TRIP welding lobe 2) |
 |
 |
Sheet thickness 1,2 mm, electrode tip diameter ø 6 mm.
1) Electrode force F 3,6 kN.
2) Electrode force F 4 kN.
Values are for guidance only. |
|
Download resistance welding manual
Content of the manual:
- Background and advice in choosing welding parameters
- Recommended welding parameters for both cold-rolled un-coated sheets and metal coated sheets
Painting
Metal-coated surfaces are very suitable for painting. In order to ensure adhesion of the paint, however, any chemical passivation, protective oil or other impurities must be removed from the surfaces to be painted. If a better than normal painted surface is required, improved surface quality (B) should be used.
Order & delivery
Testing
Each basic coil is a test unit of its own. The maximum coil size is 20 t. For each test unit, one tensile test with transversal samples (according to EN-ISO 6892-1:2009) and a coating mass test (EN 10346) are carried out.
Inspection documents
An inspection document of the required type according to EN 10204 is provided when agreed in the order.
Download information about inspection documents
General delivery information for metal coated steels
General delivery information for metal coated steels can be found from documents Handling and storage, Protection against damage due to moisture, Information required for orders and General terms of sale.
Download handling and storage instructions
Download protection against damage due to moisture
Download information required for orders
Download general conditions of sale