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AISI 4140 Steel Round Bar


Quenched & Tempered Alloyed Engineering Steel Grade
Steel AISI 4140



Features
It's one kinds of high quality alloy structural steel.

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 AISI 4140
Thyssenkrupp 7225, DIN 42CrMo4, ASSAB 709, VCL140, JIS SCM 440, EN 1.7223, EN 1.7225, EN 1.7227, EN 1.3563, Daido SCM440, KoshuhaSCM440, UNS G41400, AMS 6349, ASTM A193 (B7, B7M), ASTM A506 (4140), ASTM A752 (4140), AMS 6381, ASTM A194 (7, 7M), ASTM A513, ASTM A829, AMS 6382, ASTM A29 (4140), ASTM A513 (4140), SAE J1397 (4140), AMS 6390, ASTM A320 (L7, L7M, L7D), ASTM A519 (4140), SAE J404 (4140), AMS 6395, ASTM A322 (4140), ASTM A646 (4140), SAE J412 (4140), AMS 6529, ASTM A331 (4140), ASTM A711


Availability
Round bar 
Dia.: 10mm - 400mm
Size: 6010 mm Standard
Supplied Condition: Quenched & Tempered

Chemical composition: ( % )
CSiMnPSNiCrMoCu
0.38-0.450.15-0.400.60-0.900.0350.0350.0300.90-1.200.15-0.300.030


Mechanical Properties
Properties
AISI 4140
Tensile Strength (MPa) 655
Yield Strength (MPa) 415
Elongation at break (in 50 mm) (%) 25.7
Hardness (HB) 197
Elastic modulus (GPa) 190-210
Bulk modulus (GPa) 140
Shear modulus (GPa) 80
Poisson's ratio 0.27-0.30
Supplied Condition Annealed


Physical Properties
Properties
AISI 4140
Density (×1000 kg/m3) : 7.85
Melting point (°C) : 1416
Thermal Conductivity (@ 100°C) (W/m-K) 42.6
Thermal expansion co-efficient (µm/m°C) 12.2



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:

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