Steel for surface-treated mechanical parts with high characteristics, and mechanical parts in this steel and manufacturing method thereof
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United States of America Patent
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Issued Date -
Feb 16, 2017
app pub date -
Jun 8, 2015
filing date -
Jun 16, 2014
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Abstract
Steel for which the composition is, in weight percentages: 0.35%≦C≦0.50%; 0.30%≦Mn≦1.50%; trace amounts ≦Cr≦1.50%; 0.05%≦Mo≦0.50%; 0.15≦Si≦1.20%; trace amounts ≦Ni≦1.0%; trace amounts ≦Cu≦1.0%; trace amounts ≦V≦0.35%; trace amounts ≦Al≦0.10%; trace amounts ≦B≦0.005%; trace amounts ≦Ti≦0.10%; trace amounts ≦Nb≦0.10%; trace amounts ≦S≦0.15%; trace amounts ≦Ca≦0.010%; trace amounts ≦Te≦0.030%; trace amounts ≦Se≦0.050%; trace amounts ≦Bi≦0.050%; trace amounts ≦Pb≦0.100%; trace amounts ≦N≦0.020%; the remainder being iron and impurities resulting from the elaboration, and the C, Mn and Cr contents being such that 830-270 C %-90 Mn %-70 Cr %)≦620.
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