Brown McFarlane offers one of the largest ranges of 690 and 890 MPa yield steels in Europe in thicknesses from 3 mm to 300 mm.
Stock is available from our warehouses in the U.K. and South Africa and can be despatched worldwide by our logistics teams.
Quenched and tempered structural steel plate has the considerable advantage of providing high strength while offering weight reductions in fabrications. At Brown McFarlane we supply a a range of sophisticated high strength low alloy steel plates from leading Western European producers.
This type of steel plate is used in the manufacture of cranes, forklifts, bridges, offshore fabrications, mining and quarrying equipment, mooring equipment, and vehicle chassis to name but a few applications.
Specifications and Grades from Stock
EN 10025 S690QL, S890QL, S960QL
RQT 701, RQT 901 (from Tata Steel)
Machining
The RQT range can be machined and drilled using high-speed steel or cemented carbide tools. The approximate hardness of the RQT range can be obtained from the value of the ultimate tensile strength and falls within the range 240-280 BHN.
Welding
Care should be taken to avoid hydrogen cracking and there are many factors to take into consideration before welding. Full technical guidance for welding is available from the sales/technical team at Brown McFarlane.
Technical Specifications
Flame Cutting
RQT steels can be cut satisfactorily using conventional oxy-fuel gas practices, in many cases without the need for preheat, as long as cutting procedures take into account plate thicknesses and carbon equivalent values. Water jet, where no heat is generated, or plasma cutting can also be used. Care should be taken when cutting under water as the quenching effect could result in a high hardness edge forming. With all thermal cutting processes care should be taken that cut edges are free from sharp notches.
Cold Bending
RQT steels can be readily cold formed however the power required will be higher (70%) than that for mild steel of the same thickness. It is recommended that the largest possible bending radius should be used, and generally the inside radius should not be less that 3 times the plate thickness.
| Bend axis vs. rolling direction |
Minimum inside bending radius |
Minimum die opening |
| Perpendicular |
3t |
8.5t |
| Parallel |
4t |
10t |
Weldability and Toughness
|
Thickness
(mm) |
Maximum
(CEV (%) |
Impact Values
(min) |
| RQT 701 |
8<t<30 |
0.43 |
27J @ -45°C |
| RQT 701 |
30<t<40 |
0.52 |
|
| RQT 701 |
40<t<100 |
0.57 |
|
| RQT 701 |
100<t<130 |
0.61 |
|
| RQT 901 |
All Thicknesses |
0.57 |
27J @ -40°C |
Mechanical Properties
|
|
Yield
MPa min |
Tensile
MPa |
Elongation
% min |
| RQT 701 |
8 - 70mm |
690 |
790 - 930 |
18 |
| RQT 701 |
Above 70mm |
630 |
690 - 930 |
18 |
| RQT 901 |
8 - 49mm |
890 |
940 - 1100 |
11 |
| RQT 901 |
50mm + |
830 |
880 - 1100 |
11 |
Size range
Thicknesses: 3mm – 200mm
Widths: 2m, 2.5m, 3m
Lengths: Up to 12m long
For all available sizes download our brochure
Brochure Download
With yield strengths up to 900n/mm2 available from stock in thicknesses from 3 to 200mm available from stock.
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