Medium diameter knurled disc washer

　　Strength: 42-50HRC Material: carbon steel, alloy steel

　　Material: 65Mn

　　Material Description: 65Mn Spring Steel Chemical Composition: Carbon C: 0.62~0.70 Silicon Si: 0.17~0.37 Manganese Mn: 0.90~1.20 Sulfur S: ≤ 0.035 Phosphorus P: ≤ 0.035 Chromium Cr: ≤ 0.25 Nickel Ni: ≤ 0.30 Copper Cu: ≤ 0.25 Fold and edit the hardness of this paragraph Hot rolled hardness: 240~270HB Cold rolled soft hardness: 190~220HB Cold rolled hard hardness: 300~340HB Heat treated hardness: 38~60HRC

　　Surface treatment: colored zinc

　　Surface treatment content: Galvanized, requires passivation for better corrosion resistance. Passivation with colored passivation solution can obtain colored zinc.