General
Property | Value |
---|---|
Carbon equivalent note | CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15 and PCM = C + Si/30 + (Cr+Mn+Cu)/20 + Ni/60 + Mo/15 + V/10 + 5B |
Dimension
Property | Value |
---|---|
Dimensions | Please feel free to check the figure on the right side of the material page for more details. |
Mechanical
Property | Temperature | Value | Comment |
---|---|---|---|
Charpy impact energy | -20 °C | 40 J Show Supplier Material materials with Charpy impact energy of 40 J | min. | for thickness 6-13 mm |
Elongation | 10 % Show Supplier Material materials with Elongation of 10 % | min. | for thickness 2-3 mm | Transverse/Longitudinal, A80 | |
12 % Show Supplier Material materials with Elongation of 12 % | min. A5.65√So | for thickness 3-13 mm | Transverse | ||
14 % Show Supplier Material materials with Elongation of 14 % | min. A5.65√So | for thickness 3-13 mm | ||
Tensile strength | 750 - 930 MPa Show Supplier Material materials with Tensile strength of 750 - 930 MPa | for thickness 2-13 mm | |
760 - 950 MPa Show Supplier Material materials with Tensile strength of 760 - 950 MPa | for thickness 2-13 mm | Transverse | ||
Yield strength | 680 MPa Show Supplier Material materials with Yield strength of 680 MPa | min. | for thickness 8-13 mm | |
700 MPa Show Supplier Material materials with Yield strength of 700 MPa | min. | for thickness 2-8 mm | ||
700 MPa Show Supplier Material materials with Yield strength of 700 MPa | min. | for thickness 8-13 mm | Transverse | ||
720 MPa Show Supplier Material materials with Yield strength of 720 MPa | min. | for thickness 2-8 mm | Transverse |
Chemical properties
Property | Value | Comment |
---|---|---|
Aluminium | 0.015 % Show Supplier Material materials with Aluminium of 0.015 % | min. |
Boron | 0.005 % Show Supplier Material materials with Boron of 0.005 % | max. |
Carbon | 0.1 % Show Supplier Material materials with Carbon of 0.1 % | max. |
Manganese | 2.1 % Show Supplier Material materials with Manganese of 2.1 % | max. |
Molybdenum | 0.5 % Show Supplier Material materials with Molybdenum of 0.5 % | max. |
Niobium | 0.09 % Show Supplier Material materials with Niobium of 0.09 % | max. |
Phosphorus | 0.025 % Show Supplier Material materials with Phosphorus of 0.025 % | max. |
Silicon | 0.25 % Show Supplier Material materials with Silicon of 0.25 % | max. |
Sulfur | 0.005 % Show Supplier Material materials with Sulfur of 0.005 % | max. |
Titanium | 0.15 % Show Supplier Material materials with Titanium of 0.15 % | max. |
Vanadium | 0.2 % Show Supplier Material materials with Vanadium of 0.2 % | max. |
Technological properties
Property | ||
---|---|---|
Application areas | Its very high yield strength contributes to a solution that increases the payload capacity and gives higher strength structures. Typical applications include telescopic cranes, aerial platforms, concrete pumps, telescopic handlers, tippers and truck trailers, where the emphasis is on strength and weight reduction potential. | |
Chemical composition | The above chemical properties are based on cast analysis data. | |
Other | Weight reduction The grade in this data sheet combines outstanding mechanical properties (very high strength, fatigue resistance and toughness) with good formability and weldability. Its guaranteed high yield strength makes it possible to achieve substantial weight reduction through downgauging, whilst maintaining overall performance and safety. This steel grade is therefore frequently used to replace conventional structural steel grades when weight reduction is required. Thickness reduction brings additional savings when processing the material, since it is easier to weld, and reduces transport costs. Further savings are also achieved in service, in the form of lower energy consumption, improved mechanical performance, safety etc. Estimation of the possible thickness reduction When switching from grade 1 (with low yield strength) to grade 2 (proposed in this data sheet), an estimation of the thickness reduction that can be achieved is given by the following formula: t2 = t1 (Re1/Re2)½ where t = thickness and Re = yield strength Please note that other issues, such as fatigue resistance, need to be checked before reducing thickness. Fatigue resistance The fine grain size and low sulphur content improve the fatigue resistance of the steel. Fatigue performance is measured by uniaxial tests at different stress levels. These values are used to plot the Wöhler curve and determine the endurance limit of the steel grade. Toughness The fine grain size and low sulphur and carbon content of these Amstrong® Ultra grades improve steel toughness. For this reason, the option proposed by EN 10149:2013 for this characteristic is included in our Amstrong® Ultra range. Two versions of Amstrong® Ultra 650MC and Amstrong® Ultra 700MC are available: Bending The minimum 180° bending radius of Amstrong® Ultra 650MC and Amstrong® Ultra 700MC can vary according to the edge quality of the sheet: | |
Surface Finish | This grade is available in "A - Unexposed" finish only. | |
Thermal cutting and welding | This grade is suitable for oxygen, plasma and laser cutting. | |
Wear resistance | Abrasion/wear resistance In some applications (conveying devices, earth-moving or transportation vehicles etc), the steel surface can be subject to wear. Wear is a complex physical phenomenon that depends not only on the presence of abrasive materials but also on the conditions under which it occurs (pressure, temperature, impact, corrosion etc). Compared with standard structural steel grades, Ultra High Strength Steel grades allow a significant improvement in wear resistance. In many cases, they can be more economical and easier to process than steel grades specifically designed for wear resistance. | |
Welding | Weldability and cold crack susceptibility of this grades are more accurately assessed using the PCM formula (parameter crack measurement), which was developed for low carbon steels (< 0.11%). Due to its typical low carbon equivalent value (PCM < 0.25), this ArcelorMittal grades does not need to be pre- or post-heated when welding. It is not prone to excessive hardening due to its low carbon and low alloy content, is totally insensitive to cold cracking and is suitable for all types of arc welding. Heat-affected zone softening - welding recommendations If special care is not taken, softening may occur in the heat-affected zone (HAZ), particularly in the intercritical heat-affected zone (ICHAZ), which is typical behaviour of thermomechanically rolled steel grades with yield strength above 500 MPa. The extent of softening and the width of the softened zone increases with heat input applied during welding. In order to preserve the high mechanical properties of the base material after welding, the recommendation is to limit the welding energy to about 1.5 kJ/cm per millimetre of thickness, as shown in the figure below, which corresponds to the following maximum cooling times (between 800°C and 500°C): Interpass temperature & heat treatment Amstrong® Ultra 700MC does not need to be pre- or post-heated when welding. In multi-pass welding, the interpass temperature acts as preheating for the subsequent pass and increases cooling time. The interpass temperature should therefore be limited to minimise any loss in mechanical properties. The maximum recommended interpass temperature is 100°C. Similarly, post-weld heat treatment may cause loss in mechanical properties. We therefore strongly recommend that you contact ArcelorMittal prior to performing any heat treatment, to define the suitable settings. Filler wire selection We recommend using filler wires that at least match or overmatch the strength of the base material. Recommended wires/fluxes for Amstrong® Ultra 700MC are listed in the table below. Mechanical properties after welding When welded within the recommended heat input range, the tensile strength and the impact toughness of the welded area of Amstrong® Ultra 700MC steel grade is superior to the minimum requirements of European standards EN 288 and EN 10149 relating to the base metal. |