65 high carbon steel compare with 45 steel

65 steel, high carbon spring steel.The steel after heat treatment or cold work hardening is higher strength, hardness and elasticity, low cold deformation plasticity, weldability isn't good, generally USES the oil quenching, large cross-section parts with water quench oil cold or normalizing treatment for hardening.65 steel used in the manufacture of spring, spring coil, all kinds of washer, clutch, and manufacture of general mechanical shaft, rolling roll, eccentric shaft, etc

Characteristics and application, for example: after proper heat treatment or cold work hardening has high strength and elasticity.Weldability is bad, easy to form cracks, should not be welded, but poor machinability, low cold deformation plasticity, hardenability is bad, generally USES the oil quenching, large cross-section with cold water quench oil, or normalizing treatment.Its characteristic is its fatigue strength under the same configuration with alloy spring steel.
Delivery status: annealing state or high temperature tempering state.

#65 Chemical composition:
(C)0.62～0.70,
(Mn)0.50～0.80,
(Ni)≤0.30,
(Si)0.17～0.37,
(P)≤0.035,
(S)≤0.035,
(Cr)≤0.25
(Cu)≤0.25

#65 steel mechanical properties:
Tensile strength of sigma b (MPa) 695 or more,
Yield strength sigma s (MPa) 410 or more,
Annealing steel 229 or less,

65 carbon steel can be used for general die springs, etc.
Used in the manufacture of cross section, simple shape, force small sector or helical spring parts.
Also used as high abrasion resistance parts, such as rolling kun.

For the high quality carbon structural steel 45 # steel,high hardness is not easy machining,die often used as a template, tip, guide pin, etc., but must be heat treatment .

45 steel is a commonly used material of shaft parts, it is cheap after tempering (or normalizing)
To get a good cutting performance, and can obtain the comprehensive mechanical properties such as high strength and toughness, quenching
After the fire surface hardness can reach 45 ~ 52 HRC