HISTAR® and FRITENAR® are structural steel grades with a low alloy content, combining high strength, good toughness and superior weldability. HISTAR® steels are available in yield strengths of 355 MPa and 460 MPa, FRITENAR® steels are available in 355 MPa.
The application of the innovative in-line heat treatment QST (Quenching and Self-Tempering) allows all HISTAR® grades, unlike most standard grades, to offer improved guaranteed values for yield strength over the whole product range. A comparison between the yield strengths of HISTAR® grades and conventional grades is shown below
Min. yield strength |
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Material thickness (mm) |
HISTAR® steels are delivered in a thermomechanically rolled condition in accordance with the European Technical Approval ETA-10/0156. They comply with the requirements of the European standards EN 10025-4:2019 for weldable fine grain structural steels.

HISTAR® and FRITENAR® steels can be cut with a torch and machined using the process normally applied to structural steel of the same level of strength. Due to the low carbon equivalent, preheating in order to prevent cracking is generally not necessary for product temperatures >0°C.
HISTAR® and FRITENAR® steels offer good weldability for manual and automatic processes, provided the general rules for welding are respected. Due to the low carbon equivalent values of these steels, preheating is not necessary within the range of heat inputs of 10-60 kJ/cm and for temperatures of the structure over 0°C, provided that low hydrogen consumables are used.
For more information on our trademark steel grades, please refer to our dedicated HISTAR® brochure or ask directly to our technical advisory team or your nearest sales contact.