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The intensity of 65Mn. The hardness. The elastic and hardenability are more than 65 steel high, with overheating sensitivity and temper brittleness, water quenching crack formation tendency. The annealed machinability can be, cold plastic deformation of low, poor welding. By the plate spring medium load, spiral spring and a spring washer spring ring diameter up to 7-20mm. The high wear-resistant parts, such as grinder spindle. The spring clamping head. The precision machine tool screw. Cutter. Ring spiral roller bearings on the railway track.
- chemical composition:
Carbon C:0.62 ~ 0.70
Silicon Si:0.17 ~ 0.37
Manganese Mn:0.90 ~ 1.20
Sulfur: less than 0.035 S
P: less than 0.035 P
Cr: Cr = 0.25
Nickel: less than 0.30 Ni
Copper: less than 0.25 Cu
- Mechanical properties:
The ultimate tensile strength B (MPa):825~925
Elongation of 10 (%):14~22.5
Section shrinkage psi (%): not more than 10
Hardness: the hot, less than or equal to 302HB; hot rolling + heat treatment, is less than or equal to 321HB
- heat treatment specification and microstructure:
Heat treatment quenching specification: 830 - 20 Deg. C, oil cooling; tempering 540 - 50 Deg. C (special needs, plus or minus 30 DEG C).
Microstructure: Qu's body.
- critical point temperature (approximate) Ac1=726 DEG C, the temperature of Ac3=765 DEG C, the temperature of Ar3=741 DEG C, the temperature of Ar1=689 DEG C, the temperature of Ms=270 DEG C.
Specification: 810 - normalizing temperature of - 10 DEG C, air cooling. [1]
- delivery state: hot rolled steel with heat treatment or heat treatment delivery, cold drawn steel to heat treatment delivery.
- specification:
Round: the diameter of 5.5 ~ 16mm
Forging: the diameter of 160 ~ 450mm
The density of 65Mn
65Mn density of =7.85 g / cubic centimeter, the steel can be rolled into plate, strip and wire, spring production. 65Mn also can be made into such as the fitter chisel, stylus tools. The 65Mn steel making section size is about 8 ~ 15mm small springs such as all kinds of small size flat, round spring, spring, spring mattress.
760 c * 30min insulation, and then to 20 DEG C /h cooling rate of cooling to 700 Deg. C * 6h and furnace cooling, get the ball organization complete, uniform size.