B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 28/00 (2006.01) B21D 28/14 (2006.01) C21D 1/74 (2006.01) C21D 9/46 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01) C22C 38/32 (2006.01) C22C 38/38 (2006.01)
Patent
CA 2701559
A high-strength part that excels in hydrogen embrittlement resistance and strength after high-temperature forming; and a process for producing the same. The atmosphere in a heating furnace before forming is regulated to one of <= 10% hydrogen volume fraction and <= 30°C dew point. As a result, the amount of hydrogen penetrating in a steel sheet during heating is reduced. After forming, there are sequentially carried out quench hardening in die assembly and post-working. As the method of post-working, there can be mentioned shearing followed by re-shearing or compression forming of sheared edge portion; punching with a cutting blade having a gradient portion at which the width of blade base is continuously reduced; punching with a punching tool having a curved blade with a protrudent configuration at the tip of cutting blade part, the curved blade having a shoulder portion of given curvature radius and/or given angle; fusion cutting; etc. Consequently, the tensile residual stress after punching is reduced and the performance of hydrogen embrittlement resistance is improved.
Abe Masayuki
Fujita Nobuhiro
Hayashi Kunio
Kanda Toshiyuki
Kusumi Kazuhisa
Goudreau Gage Dubuc
Nippon Steel Corporation
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