After hardening, due to its low content of alloy elements, this steel is sufficiently ductile and doesn’t necessarily need tempering (for thicknesses < 6 mm, tempering is no use at all). Where a greater ductility is required, tempering at 450 ÷ 600°C for 1 ÷ 2 hours may be appropriate.
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The low content of alloy elements makes 30 MN B5 not very prone to brittle fracture, even if a small risk exists during processing from one stage to another. In this case, preheating at 150°C may be recommended, together with multiple weld seams and a reduced amount of weld material, especially on thicknesses > 15 mm and in very rigid structures. Except where a joint is required of the same hardness as the base steel, weld materials must feature a lower resistance than the plate itself.