| 摘要 |
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, wher
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