Material: 65Mn or 60Si2Mn (Sup6), SUP9, 28SiMnB 2. Process: Forged 3. Heat treatment: Normalised-hardened & tempered My company ... deep plowing, ridge knife, knife stubble, reclamation knife, knife tillers, disc harrow, disc plows piece, spring-tooth, etc., and to map non-standard ... am your friend. We welcome you to visit, negotiate! Heavy disc harrow