MATERIAL CATEGORY: SAE, AISI, UNS system alloy structural steel
AISI 4140 CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.38 ~ 0.45
Si (%): 0.15 ~ 0.35
Mn (％): 0.75 ~ 1.00
P (％)≤: 0.035
S (％)≤: 0.040
Cr (%): 0.80 ~ 1.10
Ni (%): -
Mo (%): 0.15 ~ 0.25
AISI 4140 MECHANICAL PROPERTIES AND HOT WORKING
Mechanical property ≥ σb/MPa: 1050
Mechanical property ≥ σs/MPa: 910
Mechanical property ≥ δ5 (%): 12
Mechanical property ≥ ψ (％): 45
Hot working temperature /℃: 1100～850
AISI 4140 MAIN FEATURES AND MELTING PROCESS
The steels shall be manufactured by melting process EF, LF + EAF+ VD, IFF + ESR Melted. VIM + ESR can be handled by agreement.
Forgings may be furnished in one of the following conditions: stress relieving; annealing; solution treatment; solution treatment and ageing; normalizing; normalizing and tempering; or quenching and tempering.
AISI 4140 TYPICAL APPLICATIONS
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Power generation – turbine fasteners – boiler support rods
Process plant – fasteners
Mechanical gears, gear shaft, main axis, valve rods
Mechanical parts - connecting rods, bolts and nuts
Multidiameter shafts
AISI 4140 PRODUCT PROFILE AND SUPPLYING FORMS
Round bar (Diameter): 0.50mm to 800mm
Square bar / Flat bar: 3mm to 800mm
Length: random length, fixed length or based on the customer's special requirement.
Steel strip: T0.20 ~ 3mm X W10 ~ 2000mm X Coil
Heavy/middle plate via hot rolled: T4 - 200mm X W200- 1200mm X L1000- 2000mm
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
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