A tubular hollow member to which torsion about a center line is applied is characterized in performing a partial heat treatment on part of a peripheral wall of the hollow member to make the hardness of an outer portion of the peripheral wall greater than the hardness before heating and greater than the hardness of an inner portion of the peripheral wall, and reduce a residual stress of the inner portion of the peripheral wall.
HOLLOW MEMBER AND METHOD FOR MANUFACTURING HOLLOW MEMBER
HOHLKÖRPER UND VERFAHREN ZUR HERSTELLUNG DES HOHLKÖRPERS
ÉLÉMENT CREUX ET PROCÉDÉ DE FABRICATION D'ÉLÉMENT CREUX
2018-07-04
Patent
Electronic Resource
English