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Abstract

The invention relates to a steel for mechanical construction, wherein its composition in percentages by weight is: 0.35%≦C≦1.2%; 0.10%≦Mn≦2.0%; 0.10%≦Si≦3.0%; traces≦Cr≦4.5%; traces≦Mo≦2.0%; traces≦Ni≦4.5%; traces≦V≦0.5%; traces≦Cu≦3.5% with Cu≦Ni %+0.6 Si % if Cu≧0.5%; traces≦P≦0.200%, traces≦Bi≦0.200%, traces≦Sn≦0.150%, traces≦As≦0.100%, traces≦Sb≦0.150%, with 0.050%≦P %+Bi %+Sn %+As %+Sb %≦0.200%, traces≦Al≦0.060%; traces≦Ca ≦0.050%; traces≦B≦0.01%; traces≦S≦0.200%; traces≦Te≦0.020%; traces≦Se≦0.040%; traces≦Pb≦0.070%; traces≦Nb≦0.050%; traces≦Ti≦0.050%; the remainder being iron and impurities resulting from the manufacture. The invention also relates to a method of hot-shaping a steel part, wherein: a billet of steel of the preceding composition is obtained; it is heated to an intermediate temperature between its solidus temperature and its liguidus temperature under conditions such that the solid fraction has a globular structure, and thixoforging of the said billet is carried out so as to obtain the said part; and cooling of the said part is carried out. Finally, the invention relates to a part made from thixoforged steel, wherein it has been produced by the preceding method.

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First Claim