No. 65 Gang Material Name: 65 unified digital code: U20652 standard: GB / T 699-1999 International Organization for Standardization (ISO): Type SC; Type DC American Society for Testing and Materials Standards (ASTM): 1065 Characteristics and application examples: adequate heat or cold hardened with high strength and elasticity. Welding is not good, easy to form a crack, not welded, poor machinability, cold plastic deformation low hardenability good, generally by oil quenching, a large section of pieces by water quenching oil cooling, or normalizing. Its characteristics are in the same configuration can be comparable to the fatigue strength alloy spring steel. No. 65 steel, high carbon spring steel. After the steel work hardening by heat treatment or has a high strength, hardness and elasticity, low cold deformation plasticity, weldability good, generally by oil quenching, a large section of the parts by water quenching oil cooling or normalizing hardening. 65 steel for the manufacture of springs, coils, all kinds of gaskets, clutches and shaft manufacturing general machinery, rollers, eccentric shaft. Delivery Status: annealed or tempering state. [1] 2 65 Chemical composition of steel [2] Chemical composition: Carbon (C) 0.62 ~ 0.70, manganese (Mn) 0.50 ~ 0.80, nickel (Ni) ≤0.30, silicon (Si) 0.17 ~ 0.37, phosphorus (P) ≤0.035, sulfur (S) ≤0.035, chromium (Cr) ≤0.25 copper (Cu) Mechanical Properties ≤0.25 [3] 3 65 Mechanical Properties: Tensile strength σb (MPa) ≥695, yield strength σs (MPa) ≥410, elongation δ5 (%) ≥10, section shrinkage ψ (%) ≥30, hardness HBS: No heat ≤255; annealed steel ≤229, sample blank size: 25mm 4 Heat Treatment Heat Treatment: 810 ℃ normalizing, quenching temperature 780-830 ℃, oil or water cooling; tempering temperature of 400-600 ℃. No. 565 steel international representation of Chinese national standard (GB / T): 65 unified digital code: U20652 International Organization for Standardization (ISO): Type SC; Type DC American Society for Testing and Materials Standards (ASTM): 1065 Japanese JIS standard steel SWRH67A / WRH67B British BS standard steel C66D French NF standard steel C66D 6 typical application example can be used for general mold spring. For the manufacture of a cross-sectional shape is simple, the force of the coil spring or small flat parts. Also used as high wear parts, such as rolling Kun and so on. Can be used in plastic mold, overall hardening steel mandrel die-casting mold.