Industeel France

Cédric Chauvy

Jean Beguinot

The invention relates to a steel for the production of submarine hulls having the chemical composition:0.030%&#x2266;C&#x3c;0.080%0.040%&#x2266;Si&#x2266;0.48%0.1%&#x2266;Mn&#x2266;1.4%2%&#x2266;Ni&#x2266;4%Cr&#x2266;0.3%0.30%&#x2266;Mo+W/2+3(V+Nb/2+Ta/4)&#x2266;0.89%Mo&#x2267;0.15%V+Nb/2+Ta/4&#x2266;0.004%Nb&#x2266;0.004%Cu&#x2266;0.45%Al&#x2266;0.1%Ti&#x2266;0.04%N&#x2266;0.0300%the balance being iron and impurities resulting from the production operation, boron being an impurity whose content is less than 0.0005%, and P+S&#x2266;0.015%, the chemical composition complying with the condition:410&#x2266;540&#xd7;C+245[Mo+W/2+3(V+Nb/2+Ta/4)]&#x2266;460.

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Saint Firmin, France

Cédric Chauvy