When welding with consumables with yield strengths (Rp0.2) up to 690 MPa the consumable properties typically don’t influence the minimum preheat temperature of the joint. The reason is that the carbon equivalent, CET, of the parent metal typically exceeds that of the weld metal by at least 0.03 units of percentage.
For consumables with yield strengths of 690 MPa and higher, the CET value for the consumable verses the CET value for Strenx is normally so high that the minimum preheating temperature of both the steel and the consumable are to be considered. In this situation, the highest minimum preheat temperature of either the joint plates or the consumable should be used. The software SSAB WeldCalc can simplify these calculations.