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SCM418 18CrMo4 1.7243 4118(H) Alloy Steel

SCM418 18CrMo4 1.7243 4118(H) Alloy Steel

SCM418 18CrMo4 1.7243 4118(H) Alloy Steel

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SCM418 18CrMo4 1.7243 4118(H) Alloy Steel




Material Name


Material Name: SCM418 18CrMo4 1.7243 4118(H) Alloy Steel
Execution standard: EN 10084-1998

Characteristics and scope of application


18crmo4 (1.7243) alloy structure steel has good processing property and welding performance. In 500 ~ 550 DEG C high rupture strength. Temperature more than 550 DEG C, oxidation resistance variation, the creep strength decreased significantly. A long time in the 500 to 550 DEG C, reducing the hot strength of steel 18crmo4, strength decreased.18crmo4 510 DEG C high and medium pressure steam pipes for manufacturing, header and tube wall temperature of 550 DEG C of superheater and forgings.


Chemical Composition


C
 Si Mn Mo
 S P
 		Cr Ni Cu
0.15～0.21
 Max 0.40
 0.60～0.90
 0.15～0.25 Max 0.035 Max 0.035
 0.90～1.20 Max 0.030 Max 0.30

Mechanical Property


Tensile strength
σb (MPa) 		Yield Strength
σs 0.2 (MPa)
Elongation
δ 5 (％)
reduction of crosssection area
ψ (％)
 ballistic work
Akv (J) 		pounding toughness value
αkv (J/cm2)
Hardness
(HB)
specimen size
Min 440 Min 295 Min 22 Min 60
 Min 94
 Min 118
   Max 179 30mm

specification of heat treatment and metallurgical structure


Specification of heat treatment : hardening 900℃ air cooling, tempering 650℃, air cooling.
Metallurgical Structure: Ferrite + pearlite + A small amount of bainite

Delivery State


In the heat treatment (quenching, annealing or tempering) or heat treatment delivery, delivery status should be indicated in the contract.