internal tooth lock washer

　　Strength: 350-420HV 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: Blue white zinc

　　Surface treatment content: Function: Rust prevention, decoration, and improved corrosion resistance Applicable materials: Various types of steel parts Coating appearance: Blue white Execution standard: ASTM-B633-98 Not environmentally friendly