Aperam

Angeline Bordas

Valérie Perrin Guerin

Gilles Pinton

Christian Vallade

Disclosed is a steel composition including specified ranges of Ni; Mo; Co; Mo+Co+Si+Mn+Cu+W+V+Nb+Zr+Ta+Cr+C; Co+Mo; Ni+Co+Mo; and traces of Al; Ti; N; Si; Mn; C; S; P; B; H; O; Cr; Cu; W; Zr; Ca; Mg; Nb; V; and Ta in specified ranges; the remainder being iron and impurities. The inclusion population, as observed by image analysis over a polished surface measuring 650 mmif hot-formed or hot-rolled; and measuring 800 mmif cold-rolled, does not contain non-metallic inclusions of diameter&#x3e;10 &#x3bc;m, and, in the case of a hot-rolled sheet, does not contain more than four non-metallic inclusions of diameter 5-10 &#x3bc;m over 100 mm, the observation being performed by image analysis over a polished surface measuring 650 mm.

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Imphy, France

Angeline Bordas