17-4 PH is a precipitation-hardening stainless steel combining high strength and corrosion resistance, widely used in aerospace, marine, and chemical equipment.
440c
440C is a high-carbon martensitic stainless steel known for its high hardness and wear resistance, commonly used in bearings, knives, and cutting tools.
1.4122
1.4122 is a martensitic stainless steel with good corrosion and heat resistance, widely used in turbine blades, valves, and mechanical components.