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GB 42CrMo | JIS SCM440 | DIN 42crmo4/1.7225 | BS EN19/709M40 | ASTM 4140 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

E-mail：export@qilucs.com

Product Detail
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    1: 4140 steel introduction
        AISI SAE 4140 alloy steel is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like axles, shafts, bolts, gears and other applications. Similar to alloy grade AISI 4130 chrome moly alloy steel but with a slightly higher carbon content. The higher carbon content of AISI 4140 steel gives greater strength and heat treatment capabilities in comparison to AISI / ASTM 4130 alloy steels, however it does have inferior weldability characteristics..
     
    2: 4140 Steel equivalent
    Country Japan Germany Britain USA China Australia
    Standard JIS G4105 DIN 17200 BS970 ASTM A29 GB/T 3077 AS 1444
    Grade SCM440 42CrMo4/1.7225 EN19/709M40 4140 42CrMo 4140
     
    3: 4140 steel chemical composition
    Grade C Si Mn P S Cr Mo Ni
    4140 0.38-0.43 0.15-0.35 0.75-1.0 0.035 0.04 0.8-1.1 0.15-0.25
    42CrMo4 0.38-0.45 0.4 0.6-0.9 0.035 0.035 0.9-1.2 0.15-0.3
    EN19 0.35-0.45 0.1-0.35 0.5-0.8 0.05 0.05 0.9-1.5 0.2-0.4
    SCM440 0.38-0.43 0.15-0.35 0.6-0.85 0.03 0.03 0.9-1.2 0.15-0.3
     
    4: 4140 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: 4140 steel overviews
    Size Round Dia 6-1200mm
    Plate/Flat/Block Thickness
    6mm-500mm
    Width
    20mm-1000mm
    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 4140 alloy steels are used for Components, Adapters, Arbors,strippers, holder blocks, mold bases, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, Axle Shafts, Bolts, Crankshafts,stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, chain links, spindles, tool bodies, tool holders, tie rods, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pinions, Pump Shafts,boring bars,tracks, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc..


    6. Heat Treatment

    Annealing
        Heat ASTM 4140 steels to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
    Normalizing
        Heat steel alloy 4140 to 870 oC – 900 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.
    Tempering
        Re-heat 4140 grade steel to 550 oC – 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
    Hardening 
        AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching.

        SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then heat to 840 oC – 875 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.


    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 block, usually the delivery condition is hot forged, annealed/QT, milled surface/Black surface
        For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.
        For cold drawn bar, usually the delivery condition is cold drawn, annealed/QT, peeled/black surface