ROQTUF AM700 contains no titanium, aluminium being used for boron protection, and has slightly higher yield and tensile strengths than the existing ROQ-tuf range. Like the rest of the ROQ-tuf range, AM700 is designed to provide an excellent combination of strength, toughness and weldability, being a fully killed fine grain grain steel, which is calcium treated to ensure low levels of sulphur and inclusion content. Furthermore, by inclusion shape control, excellent through-thickness notch toughness properties are achieved.
The chemical composition conforms to the following specified limits (wt%)
The guaranteed mechanical properties are as follows:
|Tensile Strength (Mpa)
||780 - 930
|Yield Strength (Mpa) (min)
|Elongation (%) in 50mm (min)
|Charpy impact test (J) (min)
10mm x 10mm test piece @ -50deg C
The microstructure of the steel is tempered martensite throughout the plate thickness.
ROQ-tuf AM700 is readily weldable by electric arc methods, provided that a low hydrogen practise is used. Preheating requirements are as for the current ROQ-tuf range.
ROQ-tuf AM700 is tempered at a temperature between 600 and 650deg C. Stress relieving and hot forming temperatures should, therefore, be limited to a maximum of 570deg C in order to maintain the mechanical strength of the plate.
ROQ-tuf AM700 may be bent at ambient temperature, a minimum inner bending radius of 3 times the plate thickness being recommended.
Restrictions apply as for the current ROQ-tuf range
ROQ-tuf AM700 may be flame or plasma cut using conventional equipment. No preheat necessary.
All part s are ultrasonically tested to BS 5996 B1.
ROQ-tuf plates are supplied to the tolerance specified in ASTM A6 for high strength low alloy steels.
- earthmoving equipment
- dump trucks
- mobile cranes
- drilling rigs
- high speed fans
- other high strength structural applications.