BS EN 42CrMo4 | 1.7225 Alloy Engineering Steel

BS EN 42CrMo4 | 1.7225 Alloy Engineering Steel

Short Description:

BS EN 42crmo4 Alloy Steel is a common chromium-molybdenum steel that usually used after quenchedand tempered, with high intensity, high hardenability. BS EN 42CrMo4round steel has better performance than 34CrMo4 steel due to the carbonand chromium content is higher. 42CrMo4 alloy steel has higher strength and hardenability. The 42CrMo4 alloy material alsohas high fatigue strength and good low-temperature impact toughness. The temper brittleness is not obvious. Although 42CrMo4 steel is mo...


  • Length: 3-5.8mm or Customization
  • Surface: black, peeled, or rough turned
  • Heat treatment: air-cooling, normalized, annealed, Q&T
  • Smelting process: EAF+LF+VD
  • Product Detail

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    BS EN 42crmo4 Alloy Steel


    is a common chromium-molybdenum steel that usually used after quenched
    and tempered, with high intensity, high hardenability. BS EN 42CrMo4
    round steel has better performance than 34CrMo4 steel due to the carbon
    and chromium content is higher. 42CrMo4 alloy steel


    has higher strength and hardenability. The 42CrMo4 alloy material also
    has high fatigue strength and good low-temperature impact toughness. The


    temper brittleness is not obvious.


    Although 42CrMo4 steel is more expensive than 41Cr4 steel, it is more


    preferable in terms of material properties. EN 42CrMo4 alloy
    engineering steel materials have been widely used in automotive driving
    elements. Otai Steel is able to supply you prime quality of 42CrMo4
    alloy steel materials with wide range.

    1.42CrMo4 Alloy Steel Supply Range

    42CrMo4 Round bar Sizes: 80mm – 1200mm
    Steel 42CrMo4 Flat and Plate: 10mm-1500mm thickness x 200-3000mm width
    Other steel shape and sizes available according to your requirements.

    Surface condition: Black, rough machined, peeled, turned or other requirements according to your requirements.

    2.BS EN 42CrMo4 Alloy Steel Relevant Specifications and Equivalents

    BS EN 10250 Material No. DIN ASTM A29 JIS G4105 BS 970-3-1991 BS 970-1955 AS 1444 AFNOR
    42CrMo4 1.7225 38HM 4140 SCM440 708M40 EN19A 4140 42CD4

    3.42CrMo4 Alloy Steel Chemical Composition

    42CrMo4/1.7225 C Mn Si P S Cr Mo
    0.38-0.45 0.60-0.90 0.40 max 0.035 max 0.035 max 0.90-1.20 0.15-0.30

    4. DIN 42CrMo4 Alloy Steel Mechanical Properties

    Size Ø mm Yield stress
    Rp0.2,N/nn2, min.
    Ultimate tensile Stress,
    Rm,N/nn2
    Elongation
    A5,%, min.
    Hardness HB Toughness
    KV, Joule, min.
    <40 750 1000-1200 11 295-355 35 at 20ºC
    40-95 650 900-1100 12 265-325 35 at 20ºC
    >95 550 800-950 13 235-295 35 at 20ºC

    5. Heat Treatment of 42CrMo4 Steels

    Annealing of 42CrMo4 Steels

    • Heat steel 42CrMo4 forged steel slowly and thoroughly to 800-850°C;

    • Cool slowly in the furnace to the temperature 480°;

    • Complete annealing the steel in the air.

    Quenched and Tempered (Q+T)

    • Heat 42CrMo4 steel slowly to 880°C;

    • Soak at this temperature then quench in oil;

    • Temper as soon as 42CrMo4 steel reach room temperature (20°C);

    • Heat uniformly to the suitable temperature of 560°C;

    • Withdraw the 42CrMo4 material from the furnace and cool in the air.

    6. Forging of 42CrMo4 Alloy Steel

    • Preheat 42CrMo4 engineering steel uniformly and slowly;

    • Increase the forging temperature up to 1150-1200°C.

    • Always keep the forging temperature above at least 850°C

    7.Weldability

    Engineering


    steel 42CrMo4 has only limited weldability. Preheating to 200-300°C is
    strongly recommended; the upper limit should not be exceeded because of
    risk for deterioration of the chrome layer.

    Alloy steel 42CrMo4
    can be friction welded. However, precautions are necessary so as to
    limit the formation of undesirable microstructures in the welded zone.

    8.Application of 42CrMo4 Alloy Steels

    EN


    42CrMo4 alloy steel is widely used for engineering steel purpose, such
    as: making various kinds of machinery, automobile, mining spare part,
    the gearwheel of the engine, the driving gear of supercharger, the
    connecting rob, the pinchock under the high pressure, parts for power
    train applications, cold formed fastener components, shafts, gears,
    drill collars for the oil exploration, etc.


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