The dream of creating an infinite number of cities around the world

Material Business Department

DONGAH develops forging heat treatment, special steel long bar heat treatment
and rolling roller heat treatment, ship engine Stay-Bolt heat treatment, etc.
to provide high-quality and perfect products as a heat treatment maker leader.

  • Characteristics

    Continuous heat treatment (Φ25mm~Φ300mmx15M)

    Hardness variation less uniform intensity(±HB20)


    -Deep and uniform surface hardness

    -Less defomation during the heat treatment

  • Major product


    -Stay Bolt & Stud Bolt For Marine engines

    -Heavy equipment CYL/LOD&PIN

    -Long Steel Bar

    -2ROLL Straightening