ML20MnVB Cold Heading Steel Bar


ML20MnVB is cold forging steel forming steel, cold forging is used at one or more impact loads at room temperature, widely used in the production of screws, pins, nuts and other standard parts. The cold crucible process can save raw materials and reduce costs. 


Moreover, cold work hardening can improve the tensile strength of the work piece and improve the performance. The steel used for cold crucible must have good cold upset performance, and the content of S and P in steel should be reduced. 


The surface quality of steel is strict, and high-quality carbon steel is often used. If the carbon steel content of steel is more than 0.25%, the ball annealing heat treatment should be carried out to improve the cold heading performance of the steel.

 

Chemical composition(mass fraction)(wt.%) of the ML20MnVB:

 

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)V(%)B(%)Al(%)
0.19-0.24Max 0.301.20-1.600.0350.0350.07-0.120.0005-0.00350.02

 

Mechanical properties of grade ML20MnVB:

 

Yield
Rp0.2(MPa)
Tensile
Rm(MPa)
Impact
KV (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated ConditionHBW
826 (≥)239 (≥)243232Solution and Aging, Annealing, Ausaging, Q+T, etc121

 

Physical properties of grade ML20MnVB:

 

PropertyDensity
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
161 (≥)957 (≥)132333Solution and Aging, Annealing, Ausaging, Q+T, etc
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
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