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Steel Round Bar SCM440 Using for Shaft and Flange





Equivalent JIS SCM 440
Thyssen 7225, DIN 42CrMo4, ASSAB 709, VCL140, AISI 4140


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.

Features
It's one kinds of high quality alloy structural steel.
Hot forged steel round bars and Stabilizer, diameter from 120mm to 420mm .


Availability
Round bar
Outer Diameter: 10mm - 420mm
Length: 1000mm - 9000mm



Chemical composition: ( % )
Grade C Si Mn P S Cr Ni Cu Mo
SCM 440 0.38-0.42 0.15-0.35 0.60-0.85 0.030 max 0.035 max 0.90-1.20 0.25 max 0.25 max 0.15-0.30
AISI 4140 0.38-0.45 0.15-0.40 0.60-0.90 0.035 max 0.035 max 0.90-1.20 0.030 max 0.030 max 0.15-0.30



Mechanical Properties
Properties
SCM440
Tensile Strength σb (MPa) Min 1080
Yield Strength σb (MPa) Min 930
Elongation δ5 (%)Min 12
Hardness (HB) as Supplied
Hardening Temp (C) 820-850
Impact value Akv (J)Min 63
Ouenching Medium Oil
Supplied Condition Annealed


Application
Forging main shaft and flange for wind turbine
Forging shaft, forging ring and forging tube sheet for power generation(steam turbine, gas compressor)
Forging flange, forging tube sheet and forging pipe for petrochemical equipment(pressure vessel)
Forging shaft, forging connecting rod and forging crankshaft for shipbuilding


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