Tolerances Heavy plates
Thickness, Table 1.
Width and length EN 10029.
Flatness EN 10029 class N, steel type H.
Cut lengths
Thickness, Table 1.
Width and length EN 10051.
Flatness EN 10029 class N, steel type H.
Tolerances Heavy platesSurface condition
According to EN 10 163-2 Class B Subclass 3.
Repair welding of plates is not permitted in plate produc- tion of Armor steels.
General technical delivery condition
According to EN 10 021. Unless otherwise agreed,
inspection document EN 10 204-2.2 is issued in English.
Chemical composition
The chemical composition is stated in Table 2.
Mechanical properties
Typical mechanical properties are presented in Table 3.
The plate must take suitable safety measures to protect themselves and no outsiders must be permissible in the area. The safest location is usually by the winding machine. The handling instructions of the steel supplier and safety instructions of the workshop must be adhered to in detail. New employees must receive appropriate training before they are allowed to process hardened steels.
Materials testing
Materials testing procedure is presented in Table 4.
Suggested minimum plate width of Armor 500 for different guard classes is presented in Table 5.
Heat treatment
Heat treatment is not recommended. If tempering procedure is needed, satisfy, contact technical customer service for further assistance.
Welding
Armor steels can be welded with common welding methods. Austenitic steel welding consumables are recommended. Ferritic welding consumables can be used also, if the strength of the joint is important. If ferritic consumables are used, the need for elevated working temperature has to be studied in order to achieve fault- less weld joint.
Bending
When cold forming Armor 500 steels by bending, the minimum bending radius of the upper tool has to be 8 times the thickness of the material. The corresponding bending radius for Armor 400 has to be 5 times the thickness of the material. Special care has to be taken to the working safety, when these steels are cold formed. Mechanical cutting is not suitable as an edge preparation process for bended parts.
Cutting
Armor steels are well suitable for laser and plasma cut- ting. Mechanical cutting can also be used, if the cutting shears/blades are hard enough and the equipment used is rigid. However, water jet cutting is preferred, because with this method the ballistic properties of the cut edge can be obtained.
Machining
Armor steels can be machined using rigid hard metal tools and rigid equipment. Sufficient lubrication has to be provided and special concentration has to be paid to securing of work piece. The cutting parameters should be chosen in the way that the vibration of the cutting tool and the work piece can be avoided, because vibration decreases the lifetime of the cutting tool considerably.
Occupational safety
Special care must be taken in all stages of treatment of hardened steels. Flanging is taxing due to the high strength and high flexural anxiety of the plate. If the bending radius, for example, is too small and a crack is created in the bending point, the plate may fly from the bending tool in the direction of the bend.
