Material Name: High quality carbon structural steel Grade: 55 Standard: GB / T 699-1999 ● Features and Scope: general use after normalizing or quenching, used higher strength and wear resistance or flexibility, dynamic load and impact load small parts such as gears, rim, flat springs, crankshafts, also can be used for casting. ● Mechanical Properties: Tensile strength σb (MPa): ≥645 (66) Yield strength σs (MPa): ≥380 (39) Elongation δ5 (%): ≥13 section shrinkage ψ (%): ≥35 Hardness : no heat treatment, ≤255HB; annealed steel 1045 correspond steel, ≤217HB sample size: Sample size is 25mm ● Heat treatment and microstructure: heat treatment specifications: normalizing, 820 ℃; quenching, 820 ℃; tempering, 600 ℃. Microstructure: sorbite. ● Delivery status: to no heat treatment or heat treatment (annealing, normalizing or tempering) state delivery. It requires heat treatment delivery should be specified in the contract, not indicated by not heat treatment delivery. Delivery status of steel hardness HBS10 / 3000, ≤ | no heat treatment of steel: | T 699-1999 international standardization GB /:: 217 Material Name: 65 unified digital code: U20652 standard annealed steel delivery status of steel hardness 255 HBS10 / 3000, ≤ Standard Organization (ISO): Type SC; Type DC American Society for Testing and Materials standards (ASTM): 1065 ● Features and application example: after suitable heat treatment or peening has high strength and elasticity. Welding bad, easy to form cracks, not welded 1045, poor machinability, cold plastic deformation low hardenability poor 1045 production cycle, generally use oil quenching, a large section piece by water quenching oil cooling, or normalized. It features the same configuration in the fatigue strength can be comparable to alloy spring steel. 1045 No. 65 mechanical properties of steel, high carbon spring steel. After the heat treatment or work hardening steel has a higher strength, hardness and elasticity, cold plastic deformation low, poor welding, commonly used 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 manufacture of general machinery in the shaft, roll, eccentric shaft. Supply Status: annealed or high temperature tempering state. Applications: Can be used for general mold spring. For the manufacture of a cross-sectional shape is simple, a small force of a coil spring or flat parts. Also used for high wear resistance parts, such as rolling Kun and the like. It can be used in plastic mold, overall hardening steel mandrel die-casting mold. The advantages and disadvantages 1045 | 1045 | Suzhou, provided by the same date with Metal Materials Co., Suzhou. Suzhou, with Metal Materials Co. (www.szrtjs.com) strong, credible, in Suzhou of metal building materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Suzhou, and you work with into the brilliant, for a better future!