Study on strength and toughness of seam of HSLA steel

By adding the alloy elements,the influences of these elements on the strength and toughness of seam,especially on the low temperature toughness were researched.The results show that the upper shelves of the Charp V transition curves for the weld metals maintain high level despite the different alloying elements.However,the influence of alloying degree on the low-temperature toughness is significant.Weld seam multi-alloyed with Ti ,B,Ni and so on have high volume fractions of acicular ferrite in the metallographs,which has high strength and toughness.