Stainless Steel: 9Cr18 Standard: GB/T 1220-1992 ● Characteristics and Applications: Used for stainless steel cutting mechanical blades and shearing tools, surgical blades, high wear-resistant equipment parts, etc. ● Chemical Composition: Carbon C: 0.90～1.00 Silicon Si: ≤0.80 Manganese Mn: ≤0.80 Sulfur S: ≤0.030 Phosphorus P: ≤0.035 Chromium Cr: 17.00～19.00 Nickel Ni: Allowed content ≤0.60 Molybdenum Mo: Can be added ≤0.75 ● Mechanical Properties: Hardness: Annealed, ≤255HB; Quenched and Tempered, ≥55HV ● Heat Treatment Specifications and Metallographic Structure: Heat Treatment Specifications: 1) Annealing, 800～920℃ slow cooling; 2) Quenching, 1000～1050℃ oil cooling; 3) Tempering, 200～300℃ oil or air cooling. Metallographic Structure: The structural characteristic is martensitic. ● Delivery Condition: Generally delivered in heat-treated condition, with the type of heat treatment specified in the contract; if not specified, delivered in non-heat-treated condition.