aisi 4140 Steel Structural High toughness aisi 4140 Steel Structural Bars

aisi 4140 Steel Structural High toughness aisi 4140 Steel Structural Bars

What is AISI 4140 Steel?
AISI 4140 alloy steel round bar sheet plate belongs to medium hardenability
steel.AISI 4140 steel round bar has high fatigue strength and low notch
sensitivity. Low-temperature impact toughness is also very high, no obvious
temper brittleness. It is mainly used after quenching and tempering state. It
is used to manufacture high-strength parts under impact loads and the fittings
with large cross-sections and other stressed members. Such as the horizontal
eccentric shaft of the horizontal forging machine, the crankshaft of the
forging press, and etc.
Its equivalent grade is JIS SCM440 and DIN 1.7225. The properties and
composition of 4140 steel round bar sheet plate as below.

What is the application of 4140 steel?
AISI 4140 steel round bar is an alloy structural steel with good strength and
good comprehensive mechanical properties after heat treatment. It has good
manufacturability. The maximum operating temperature is 427°C. It is used to
manufacture forgings that require higher strength and larger quenched and
tempered section than 35CrMo steel, and can also be used to manufacture turbine
fasteners, tool bodies, dies, brake shoes, etc.


keyword  
aisi 4140 Steel Structural
Standard
AISI/ASTM/DIN/NF/JIS/GB/BS
Steel Grade
AISI 4140/ASTM 4140/DIN 1.7225 /NF 40CD4 /JIS SCM440 /GB 42CrMo /BS 708M40
Chemical Compositions(%)
C: 0.38-0.45   Si: 0.17-0.37  Mn: 0.50 , -0.80  P≤0.035  S ≤0.035  
Cr: 0.90-1.20  Mo: 0.15-0.25
Mechanical properties
Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5 (%): ≥12
Area shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness: ≤217HB
Sample size: sample blank size is 25mm
Surface treatment
Black/Peeling/Polishing/Machined
Technique
Cold/Hot rolled, Cold-Drawn or Hot Forged
Heat Treatment
Annealed; Quenched; Tempered
Delivery Condition
Hot Rolled or Forged/Peeled or Black Surface/Annealed or QT
Heat treatment standard Quenching at 850℃, oil cooling; tempering at 560℃,
water cooling, oil cooling
Metallographic structure
Tempered sorbite
Test
SGS/UT100%/Elements Testing
Certificate
SGS/ISO/Mill Certificate
Delivery status
Delivered in heat-treated (normalized, annealed or high temperature tempered)
or unheated state
Skype/Whatsapp/Wechat
+86-18269260283
Company website
https://steelpurchase.com/
http://www.songs , hunsteel.com/
songshunsteel41404340

Minimum Order: 1 tons

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