Osorio de CastroStand: 4H06Certifications and quality assurancehttps://osoriodecastro.com/Pre-treated steels (Quenching and tempering)42CrMo4 + QT / 34CrNiMo6 + QTOther productsCarbon steelsEasy Cut steelsAceros de CementaciónCast ironHard Chromed / Tempered Hard chromeInner Lapped Tube H8/H9Other alloys