S690 QL/S690 QL1 high strength structural steel | Advanced high-strength steel structural Sections, ultra-high-strength steel structural Sections, Super Duplex/stainless steel structural Sections, special Sections, composite steel structural Sections, laser-welded steel Sections

S690 QL/S690 QL1 high strength structural steel 2023-12-12

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 in %)

C	Si	Mn	P	S	Cr	Mo	Ni	Al
≤0.2	≤0.8	≤1.70	≤0.020	≤0.005	≤1.50	≤0.70	≤2.0	≤0.100

Mechanical Properties

Plate Thickness mm	Yield Point R_e MPa	Tensile Strength R_m MPa	Elongation at Rupture A₅ %
≤ 50	690	770 – 940	14
> 50 ≤ 100	650	760 – 930	14
> 100 ≤ 150	630	710 – 900	14

Notch Impact Energy

Steel Grade	Position of Samples	0°C	-20°C	-40°C	-60°C
S690Q	Longitudinal	40 J	30 J	–	–
S690Q	Transverse	30 J	27 J	–	–
S690QL	Longitudinal	50 J	40 J	30 J	–
S690QL	Transverse	35 J	30 J	27 J	–
S690QL1	Longitudinal	60 J	50 J	40 J	30 J
S690QL1	Transverse	40 J	35 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 plate thickness 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 delivery condition.

Milling

Drilling with cobalt-alloyed high-speed steels HSSCO, the cutting speed should be approximately 17 – 19 m/min. If HSS drills are used, it should be approximately 3 – 5 m/min. cutting speed should be approximately 3 – 5 m/min.

Flame-Cutting

The material temperature should be at least room temperature. We recommended the following preheating temperatures: for plate thicknesses > 40mm up to 100°C, > 80mm up to 150°C and > 100mm up to 175°C.

Welding

The steel is suitable for all known welding methods. The material temperature should be at least room temperature. We recommended the following preheating temperatures: for plate thicknesses > 20mm up to 75°C, > 40mm up to 100°C, > 60mm up to 150°C and > 100mm up to 175°C. Interpass temperature should be between 150°C – 225°C.

These indications are standard values only. In general indications of SEW 088 should be adhered to. The t8/5 times should be between 5 and 15 s, depending on the welding technique used. A subsequent stress relief annealing for constructional reasons should be done in the temperature range of 530°C – 580°C.

Previous：EN 10210 and EN 10219 – New Part 3 now available
Next：Stainless steel laser welding profile knowledge

Relevant information