Patent ID: 9669482
Date: 2017-06-06
CPC Classifications: B23K,B32B,B63B,B63G,C21D,C22C

Claim:
1. Assembled submarine hull steel components, each steel component having a chemical composition consisting of, in weight percent: impurities resulting from the production operation, said impurities including the balance being iron, the chemical composition complying with the condition: the steel components having a structure comprising: at least 90% of martensite, a maximum of 5% of residual austenite, and a maximum of 5% of ferrite, the steel components having an elastic limit of between 480 MPa and 620 MPa, wherein the steel components have a thickness of between 15 mm and 150 mm, of forged or rolled steel which has been quenched and tempered, wherein the components are assembled by welding by means of: arc welding using a coated electrode welding process, or arc welding using a solid wire MIG welding process, said welding being started with no preheating or with preheating to a temperature less than or equal to 25° C., including when the welding is carried out on a site on which the temperature is less than 0° C., and the welding of steel components comprises using filler metal.