SCM 440 Round Bar & Flat

Chromium Molybdenum Steel
Steel SCM 440 JIS

Characteristics
Very common Quenched & Tempered alloyed engineering steel grade With high intensity, high hardenability. It has a small distortion afer quenching, a ghigh creep strength and lasting intensity afer processing of high tempreature.

Equivalent
Thyssenkrupp 7225, DIN 42CrMo4, ASSAB 709, VCL140

Availability
Round bar, Flat bar
Diameter: 10mm – 400mm
Thickness: 5mm – 25mm

Chemical composition: ( % )

Chemical Composition(%)
C Si Mn P S Cr Mo
0.38~0.43 0.15~0.35 0.60~0.90 0.030max 0.030max 0.90~1.20 0.15~0.30

Mechanical Properties
Young’s modulus (MPa) : 200000 – 200000
Tensile strength(MPa) : 650 – 880
Elongation (%) : 8 – 25
Fatigue (MPa) : 275 – 275
Yield strength (MPa) : 350 – 550

Hot-rolled
hardness
Annealed
hardness
(HRB)
Hardening Hardening
Hardness(HRC)
Temperature(℃)
below3.15 3.15~6.00 6.01~9.00
HRC 39max 95max 830~880oil quenched 52min 51min 50min

Physical Properties
Thermal expansion (e-6/K ) : 10-10
Thermal conductivity (W/m.K ) : 25 – 25
Specific heat (J/kg.K ) : 460 – 460
Melting temperature (°C ) : 1450 – 1510
Density (kg/m3 ) : 7700 – 7700
Resistivity (Ohm.mm2/m) : 0.55 – 0.55

Application
It’s mainly used for making various kinds of machinery, automobile, mining spare part, the gearwheel of the engine, the driving gear of supercharger, the abckshaft, the conncetingrob and the pinchock under the high pressure. Parts for power train applications, cold formed fastener components, shafts, gears, drill collars for the oil exploration, etc.

Related Steel Round Bar Product:
 
Ikuti

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