Abstract: A dual pass seam welding method for steels having a Ceq of greater than about 0.45. The first pass welds the immediately anneals the weld. On the second pass, the welder is disengaged, and the weld is subjected to a second anneal.

Abstract: A martensitic steel including the following elements, expressed in percentage by weight 0.1%?C?0.4%; 0.2%?Mn?2%; 0.4%?Si?2%; 0.2%?Cr?1%; 0.01%?Al?1%; 0%?S?0.09%; 0%?P?0.09%; 0%?N?0.09%; and can contain one or more of the following optional elements 0%?Ni?1%; 0%?Cu?1%; 0%?Mo?0.1%; 0%?Nb?0.1%; 0%?Ti?0.1%; 0%?V?0.1%; 0.0015%?B?0.005%; 0%?Sn?0.1%; 0%?Pb?0.1%; 0%?Sb?0.1%; 0%?Ca?0.1%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel having microstructure by area percentage including cumulative presence of residual austenite and bainite between 0% and 25%, the remaining microstructure being martensite at least 70%, and with an optional presence of ferrite between 0% and 10%.