Common typical martensitic age-hardening steels are categorized by strength grades.
18Ni(200), 18Ni(250), 18Ni(300), and 18Ni(350) are widely used steel grades with practical applications.
18Ni martensitic时效钢 comes in three types with yield strengths of 1350MPa, 1650MPa, and 1950MPa, respectively. This steel has a low impurity content and requires single or double vacuum smelting. It also contains 0.003% B, 0.002% Zr, and 0.005% Ca to remove impurities and enhance the thermal plastic deformation processing properties.
