S690QL

S690QL Quenched And Tempered Steel Plate

S690Q standard toughness, S690QL high toughness and S690QL1 extra toughness

S690Q - Steel number 1.8931 according to EN 10137 with minimum impact values down to -20°C (-4°F)

S690QL - Steel number 1.8928 according to EN 10137with minimum impact values down to -40°C (-40°F)

S690QL1-Steel number 1.8988 according to EN 10137with minimum impact values down to -60°C (-76°F)

Condition of Delivery

Water quenched and tempered.

Typical Applications

Heavy road vehicles: chassis, dumper bodies. Cranes construction: booms of mobile cranes.

Structural steelworks: bridges, bridge components, components for offshore structures.

Pressure vessels: fixed and transportable storage tanks, vessels. Power plants:

penstocks, spiral cases. Materials handling: lifting and mobile equipment.

Mining and earthmoving equipment: roof supports. Agricultural equipment and trailers.

Chemical Composition (heat analysis, %)

C	SI	Mn	P	S	Cr	Mo	NI	AI
0.20 max	0.80 max	1.70 max	0.0.20 max	0.005 max	1.50 max	0.70 max	2.0 max	0.015 max

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	690	760 - 930	14
> 100	690	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

High Strength Steel S690QL1

Cold-Forming

S690QL1 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

The temperature of the material should be at least RT for flame-cutting. In addition, the following

preheating temperatures are recommended for certain plate thicknesses:

For plate thicknesses over 40mm, preheat to 100°C and for thicknesses over 80mm, preheat to 150°C.

Welding

S690QL1 Extra High Toughness

S690QL1 steel is suitable for all current welding methods. The temperature of the material should be

at least RT for welding. In addition, the following preheating temperatures are recommended for certain plate thicknesses:

20mm – 40mm:   75°C

Over 40mm:      100°C

60mm and over:150°C

These indications are standard values only, in principle, indications of SEW 088 should be adhered to.

The t 8/5 times should be between 5 and 25 s, depending on the welding technique used.

Should stress relief annealing be necessary for constructional reasons,

this should be done in the temperature range of 530°C-580°C.

Welding  :

Welding Method	Type of Electrode
E-Hand	FOX EV 85, FOX U 100 N OK 75.75	E11018-G E11018-M	Böhler ESAB
UP	U 100-UP, NiCrMo 2,5-UP//BB24 OK Autrod 13.44/ OK Flux 10.62	EF6, F11A8-EM4-M4	Böhler ESAB
MAG	70-IG/M2 OK Autrod 13.29, OK Tubrod 14.03	ER110S-G ER100S-G, E110T-G	Böhler ESAB