High Tensile Steel Plate
High Tensile Steel is steel at the lower end of the medium-carbon ranges which have additionals alloying ingredients in order to increase their power, wear properties, and tensile strength. They are hot rolled at utmost temperatures which make them hard enough to bear high temperature and pressure without acquire rusty or damaged.
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Works Designation
MAXIL 690 Q / MAXIL 690 QL / MAXIL 690 QL1
DIN EN S 690 Q / S 690 QL / S690 QL1
Condition of Delivery
Water quenched and tempered.
Typical Applications
Heavy road vehicles: chassis, dumper bodies. Cranes construction: booms of mobile cranes. Structural steelworks: bridge components, components for offshore structures. Pressure vessels: fixed and transportable storage tanks, vessels. Power plants: penstocks, spiral cases. Mining equipment: roof supports etc.
Chemical Composition (Heat analysis in %)
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Al |
|
0.20max. |
0.80max. |
1.70max. |
0.020max. |
0.015max. |
1.50max. |
0.70max. |
1.50max. |
0.015max. |
In addition: Ti or/and V or/and Nb.
The manufacturer reserves the right to change the chemical composition.
Mechanical Properties
|
Plate thickness mm |
Re MPa |
Rm MPa |
A % |
|
≤ 50 |
690 |
770 - 940 |
14 |
|
> 50 ≤ 100 |
650 |
760 - 930 |
14 |
|
> 100 |
630 |
710 - 900 |
14 |
Notch Impact Energy
Steel Grade |
Position of Samples |
0°C |
- 20°C |
- 40°C |
- 60°C |
|
S690Q |
Longitudinal Transverse |
40 J 30 J |
30 J 27 J |
|
|
|
S690QL |
Longitudinal Transverse |
50 J 35 J |
40 J 30 J |
30 J 27 J |
|
|
S690QL1 |
Longitudinal Transverse |
60 J 40 J |
50 J 35 J |
40 J 30 J |
30 J 27 J |
Number of Tests
Tensile test and impact test (3 samples), every 40 t, or per heat treatment unit respectively.
Processing
Cold-Forming
The steel is suitable for cold-forming adhering to a bending or folding radius of > 4 times plate thickness longitudinal and > 3 times transverse to rolling direction. A subsequent stress relief annealing is possible up to a temperature of 580°C.
Hot-Forming
Hot-forming above 580°C is possible. A subsequent quenching and tempering has to be carried out according to the conditions of delivery.
Milling
Drilling with cobalt-alloyed high-speed steels HSSCO. Cutting speed should be approximately 17 - 19 m/min.
If HSS drills are used, cutting speed should be approximately 3 – 5 m/min.
Flame-Cutting
Material with temperatures under 5°C and thicknesses ≤ 40mm should be preheated to RT. Plate thicknesses > 40mm should be preheated to 100°C, 80mm and over should be preheated to 150°C.
Welding
The steel is suitable for all current welding methods. In principle, preheating is not necessary for thicknesses up to 30mm.
The following preheating temperatures are recommended:
20mm – 40mm: 75°C
Over 40mm: 100°C
60mm and over: 150°C
Material with temperatures under 5°C should be preheated to RT for plate thicknesses < 20mm. Interpass temperature should be between 150°C and 225°C. These indications are standard values only, in principle,
in accordance of SEW 088 should be adhered to.
Depending on the welding method, the t 8/5 times should be between 5 - 25 s. If stress relief annealing should be necessary for constructional reasons, it should be in the temperature range of 530°C - 580°C.
Filler:
|
Welding Method |
Type of Filler |
|
|
Manual |
FOX EV 85, FOX U 100 N DIN 8529, AWS A 5.5 OK 75.75 |
Böhler ESAB |
|
UP |
U 100-UP, NiCrMo 2,5-UP//BB24 DIN 32522, AWS A 5.23 OK Autrod 13.44/OK Flux 10.62 |
Böhler ESAB |
|
MAG |
70-IG/M21 AWS A 5.28 OK Autrod 13.29, OK Tubrod 14.03 |
Böhler ESAB |
