Maraging steel is an ultra-high strength steel based on carbon-free or ultra-low carbon Fe-Ni martensite, which undergoes aging treatment to precipitate harden with intermetallic compounds. The strength of this type of steel does not come from carbon but from the precipitation of intermetallic compounds.

After solution treatment, 18Ni steel forms an ultra-low carbon martensite with a hardness of 28~30 HRC. Following aging treatment, due to the precipitation of various types of intermetallic compounds, age hardening occurs, increasing the hardness to 50 HRC. The outstanding feature of 18Ni steel is that, under conditions of ultra-high strength and high hardness, it still maintains good toughness and high fracture toughness. Additionally, this type of steel does not undergo work hardening, has minimal deformation during aging heat treatment, exhibits good weldability, and can undergo surface nitriding treatment.

18Ni maraging steel possesses high strength and hardness (ultra-high tensile strength, surface hardness of 50~54 HRC), along with good toughness and plasticity. It is a key material for manufacturing aerospace and defense industry equipment and is widely used in industries such as aviation, aerospace, and precision molds. Currently, it is extensively used domestically and internationally for manufacturing high-precision load-bearing components such as engine casings and high-speed rotors for uranium isotope centrifuges.

3Cr2W8V—Die Steel‖, 5CrNiMo, 9CrSi‖Die Steel, GCr15 Bearing Steel, ‖60Si2Mn Spring Steel, 35CrMo—Alloy Steel, 40Cr—Gear Steel, 38CrMoAl—Mechanical Steel, 20CrMnTi, 42CrMo, W6Mo5Cr4V2—High-Speed Steel, SKH-9 High-Speed Steel, Electric Furnace, Electroslag H13—Die Steel‖, Cr12MoV—Die Steel, LD—Die Steel, Alloy Steel, High-Speed Steel Round Bar and H13—Electroslag Module, P20—Die Steel, 718H—Die Steel, 2738, NAK80, S136 Plate Module

Cold Work Die Steel: Cr12MoV, Cr12Mo1V1, SKD11, D2, CrWMn, LD, DC53
Hot Work Die Steel: 5CrNiMo, 5CrNiMoV (1.2714), SWQH13, SWMD, 1.2367, DSAMAX, 3Cr2W8V
Plastic Mold Steel: SWP20, SW718H, S136, 4Cr13
Alloy Tool Steel: 9CrSi
High-Speed Tool Steel: W6Mo5Cr4V2, W18Cr4V