Surface softened bar steel
This is a steel material that softens only the surface of the full cross-section high-strength (quench-hardened) steel, significantly improving its delayed fracture characteristics (hydrogen embrittlement resistance) while maintaining high strength.
This is a steel rod that has been softened to below 1200 MPa in the surface layer, which is the starting point for delayed fracture, in relation to high-strength steel materials (tensile strength reference: 1200-2200 MPa), thereby reducing the risk of delayed fracture (patent obtained). By applying this technology, the delayed fracture resistance (hydrogen embrittlement resistance) of high-strength steel materials and high-stress components can be significantly improved, and the softening of the surface layer enhances workability, making machining easier. It has been mass-produced for use in high-stress spring steel wire, high-strength deformed PC steel rods, etc.
- 企業：ネツレン 高周波熱錬
- 価格：Other
