The Japan Steel Works, Ltd.

Hirokazu Inoue

Yoru Wada

Rinzo Kayano

Tatsuo Hasegawa

Using information about the position, orientation, and shape of a crack appeared in a judged material and information about the structure of the judged material as parameters, the stress intensity factor Kof the crack is found. Based on the stress intensity factor K, hydrogen embrittlement cracking of the judged material is judged. The crack growth rate and possibility of brittle fracture can be judged by comparing the stress intensity factor Kwith the critical stress intensity factor Kfor crack initiation or the critical stress intensity factor Kfor brittle fracture about the temper embrittled steel which absorbs approximately 2.0 ppm hydrogen.

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Minato-ku, Japan

Hirokazu Inoue