Hydrogen Embrittlement of Steel

Abstract

Hydrogen embrittlement of steels and retarding hydrogen absorption from the view point of improvement in steels were reviewed. Ni concentrating at the surface after heat treatment retarded the absorption of hydrogen and delayed fracture properties were improved. High alloy steels such as maraging type steel were fractured in the delayed fracture accelerated test for bolts while they showed extremely low hydrogen embrittlement in the raw materials test. It was revealed that hydrogen absorption due to galvanic corrosion was increased in the bolt test and the much addition of Ni prevented hydrogen embrittlement.