ROQTUF AM700

GENERAL DESCRIPTION

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.

CHEMICAL COMPOSITION

The chemical composition conforms to the following specified limits (wt%)

MECHANICAL PROPERTIES

The guaranteed mechanical properties are as follows:

MICROSTRUCTURE

The microstructure of the steel is tempered martensite throughout the plate thickness.

WELDABILITY

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.

HEAT TREATMENT AND HOT FORMING

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.

COLD FORMING

ROQ-tuf AM700 may be bent at ambient temperature, a minimum inner bending radius of 3 times the plate thickness being recommended.

SHEARING, PUNCHING AND MACHINING

Restrictions apply as for the current ROQ-tuf range

CUTTING

ROQ-tuf AM700 may be flame or plasma cut using conventional equipment. No preheat necessary.

ULTRASONIC TESTING

All part s are ultrasonically tested to BS 5996 B1.

DIMENSIONAL TOLERANCES

ROQ-tuf plates are supplied to the tolerance specified in ASTM A6 for high strength low alloy steels.

APPLICATIONS

• earthmoving equipment
• dump trucks
• trailers
• mobile cranes
• drilling rigs
• high speed fans
• buildings
• other high strength structural applications.