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JIS SCM420 | DIN 18CrMo4/1.7243 | ASTM 4118 Engineering Steel

Port: Hu nan

engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel

Alloy Structural Steel, Alloy Tool Steel, Carbon Structural Steel, Carbon Tool Steel, Bearing Steel, Spring Steel ,Stainless Steel, Refractory Steel, Roll Steel, Pinion Steel. Additionally, the company also has the capacity to forge round steel, steel flat, square steel, module, shaft and roller


  • Quick Details

    1: 4118 steel introduction
        4118 Steel one steel grade in ASTM A29 standard. ASTM 4118 steel is one of popular alloy steel used for engineering purpose, like fasteners, high pressure pipe and more advanced carburized parts, such as gear, shaft, etc. which work in the noncorrosive medium and temperature below 250 oC, working with nitrogen hydrogen mixture in the medium.
    2: 4118 Steel equivalent
    Country British USA Japan
    Standard DIN/EN10084 ASTM A29 JIS G4105
    Grade 18CrMo4/1.7243 4118 SCM420
    3: 4118 steel chemical composition
    Grade C Si Mn P S Cr Mo Ni
    4118 0.18-0.23 0.15-0.35 0.7-0.9 0.035 0.035 0.4-0.6 0.08-0.15 /
    18CrMo4 0.15-0.21 0.4 0.6-0.9 0.025 0.035 0.9-1.2 0.15-0.25 /
    SCM420 0.18-0.23 0.15-0.35 0.6-0.85 0.03 0.03 0.9-1.2 0.15-0.30 /
    4: 4118 steel mechanical properties  

      The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

    5: 4118 steel overviews

    Size Round Dia 6-1200mm
    Plate/Flat/Block Thickness
    Heat treatment Normalized ; Annealed ; Quenched ; Tempered
    Surface condition Black; Peeled; Polished; Machined; Grinded; Turned; Milled
    Delivery condition Forged; Hot rolled; Cold drawn
    Test Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. 
    Payment terms T/T;L/C;/Money gram/ Paypal
    Trade terms FOB; CIF; C&F; etc..
    Delivery time 30-45 days
    Application 4118 are used for  gear components of all kind and cog wheels. Open die steel forgings for general engineering purposes.

    6: Heat Treatment
    Normalizing temperature: 860-900oC.
    Harden AISI 4118 steel from a temperature of 850-880oC followed by oil or water quenching. Hardness after quenching is 39-47 HRC.
    Tempering temperature: 595-700oC.

    7: Delivery condition
    For hot forged bar, usually the delivery condition is hot forged, annealed/QT rough turned/Black surface.
    For hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
    For hot forged plate, usually the delivery condition is hot forged, annealed/QT, milled surface

    For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.