High Quality for AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Manufacturer in Burundi

High Quality for AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Manufacturer in Burundi

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AISI 4340 steel is a medium carbon, low alloy steel known for its toughness andstrength in relatively large sections. AISI 4340 is also one kind ofnickel chromium molybdenum steels. 4340 alloy steel is generallysupplied hardened and tempered in the tensile range of 930 – 1080 Mpa.Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. The 4340 steel has goodshockand impact resistance as well as wear and abrasion resistance inthe ...

  • 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
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    AISI 4340 steel

    is a medium carbon, low alloy steel known for its toughness and
    strength in relatively large sections. AISI 4340 is also one kind of
    nickel chromium molybdenum steels. 4340 alloy steel is generally
    supplied hardened and tempered in the tensile range of 930 – 1080 Mpa.
    Pre hardened and tempered 4340 steels can be further surface hardened by

    flame or induction hardening and by nitriding. The 4340 steel has good
    shockand impact resistance as well as wear and abrasion resistance in
    the hardened condition. AISI 4340 steel properties offer good ductility
    in the annealed condition, allowing it to be bent or formed. Fusion and
    resistance welding is also possible with our 4340 alloy steel. ASTM 4340

    material is often utilized where other alloy steels do not have the
    hardenability to give the strength required.For highly stressed parts
    it is excellent choice. AISI4340 alloy steelcan also be machined by
    all customary methods.

    Due to availability the ASTM 4340 grade steel is often substituted
    with European based standards 817M40/EN24 and 1.6511/36CrNiMo4 or Japan
    based SNCM439 steel. You have the detailed data of 4340 steel below.

    1. AISI4340 Steel Specification and Relevant Standards

    Country USA Britain Britain Japan
    Standard ASTM A29 EN 10250 BS 970 JIS G4103
    Grades 4340 36CrNiMo4/
    EN24/817M40 SNCM 439/SNCM8

    2. ASTM 4340 Steels And Equilvalents Chemical Composition

    Standard Grade C Mn P S Si Ni Cr Mo
    ASTM A29 4340 0.38-0.43 0.60-0.80 0.035 0.040 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30
    EN 10250 36CrNiMo4/
    0.32-0.40 0.50-0.80 0.035 0.035 ≦0.40 0.90-1.20 0.90-1.2 0.15-0.30
    BS 970 EN24/817M40 0.36-0.44 0.45-0.70 0.035 0.040 0.1-0.40 1.00-1.40 0.20-0.35
    JIS G4103 SNCM 439/SNCM8 0.36-0.43 0.60-0.90 0.030 0.030 0.15-0.35 1.60-2.00 0.60-1.00 0.15-0.30

    3. AISI Alloy 4140 SteelMechanical Properties

    Mechannical Properties

    (Heat Treated Condition )

    Condition Ruling section
    Tensile Strength MPa Yield Strength
    Izod Impact
    T 250 850-1000 635 13 40 248-302
    T 150 850-1000 665 13 54 248-302
    U 100 930-1080 740 12 47 269-331

    V 63 1000-1150 835 12 47 293-352
    W 30 1080-1230 925 11 41 311-375
    X 30 1150-1300 1005 10 34 341-401

    Y 30 1230-1380 1080 10 24 363-429
    Z 30 1555- 1125 5 10 444-

    Thermal Properties

    Properties Metric Imperial
    Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper 12.3 μm/m°C 6.83 μin/in°F
    Thermal conductivity (typical steel) 44.5 W/mK 309 BTU in/hr.ft2.°F

    4. Forging of 4340 Alloy Steel


    the steel 4340 first, heat up to 1150°C – 1200°C maximum for forging,
    hold until temperature is uniform throughout the section.

    Do not forge

    below 850 °C. 4340 has good forging characteristics but care must be
    taken when cooling as the steel shows susceptibility to cracking.
    Following forging operation the work piece should be cooled as slowly as

    possible. And cooling in in sand or dry lime is recommended etc.

    5. AISI 4340 Steel Grade Heat Treatment

      Stress Relieving


      pre-hardened steel stress relieving is achieved by heating steel 4340
      to between 500 to 550°C. Heat to 600 °C – 650 °C, hold until temperature

      is uniform throughout the section, soak for 1 hour per 25 mm section,
      and cool in still air.



        full anneal may be done at 844°C (1550 F) followed by controlled
        (furnace) cooling at a rate not faster than 10°C (50 F) per hour down to

        315°C (600 F). From 315°C 600 F it may be air cooled.



          4340 alloy steel should be in the heat treated or normalized and heat
          treated condition before tempering. The tempering temperature for
          depends upon the strength level desired. For strength levels in the 260 –

          280 ksi range temper at 232°C (450 F). For strength in the 125 – 200
          ksi range temper at 510°C (950 F). And don’t temper the 4340 steels if
          it is in the 220 – 260 ksi strength range as tempering can result in
          degradation of impact resistance for this level of strength.

          Tempering should be avoided if possible within the range 250 °C – 450 °C due to temper brittleness.

            Flame or Induction Hardening

            As mentioned above, pre-hardened and tempered 4340 steel bars or plates can be further surface hardened by either the flame or induction hardening

            methods resulting in a case hardness in excess of Rc 50. AISI 4340
            steel parts should be heated as quickly as possible to the austenitic
            temperature range (830 °C – 860 °C) and required case depth followed by
            an immediate oil or water quenching, depending upon hardness required,
            workpiece size/shape and quenching arrangements.

            quenching to hand warm, tempering at 150°C – 200°C will reduce stresses
            in the case with minimal effect on its hardness.

            All de-carburised surface material must first be removed to ensure best results.



              and tempered 4340 alloy steel can also be nitrided, giving a surface
              hardness of up to Rc 60. Heat to 500°C – 530°C and hold for sufficient
              time (from 10 to 60 hours) to develop the depth of case. Nitriding

              should be followed by slow cooling (no quench) reducing the problem of
              distortion. The nitrided grade 4340 materials can therefore be machined
              to near final size, leaving a small grinding allowance only. The tensile

              strength of the 4340 steel material core is usually not affected since
              the nitriding temperature range is generally below the original
              tempering temperature employed.

              Surface hardness achievable is 600 to 650HV.



              is best done with the alloy steel 4340 in the annealed or normalized
              and tempered condition. It can be readily machined by all conventional
              methods such as sawing, turning, drilling etc. However in the high
              strength conditions of 200 ksi or greater the machinability is only from

              25% to 10% that of the alloy in the annealed condition.



              of steel 4340 in the hardened and tempered condition (as normally
              supplied), is not recommended and should be avoided if at all possible,
              because of the danger of quench cracking, as the mechanical properties
              will be altered within the weld heat affected zone.

              If welding

              must be carried out, pre-heat to 200 to 300°C and maintain this while
              welding. Immediately after welding stress relieve at 550 to 650°C, prior

              to hardening and tempering.

              If welding in the hardened and
              tempered condition is really necessary, then the work piece, immediately

              on cooling to hand warm, should be if possible stress relieved at 15 °C

              below the original tempering temperature.

              8. Application of 4340 Steel


              4340 steel is used in most industry sectors for applications requiring
              higher tensile/yield strength than 4140 steel can provide.

              Some typical applications such as:

                Aircraft Landing Gear


                Oil and Gas Drilling,


                Warm and Cold Forming,

                Machine Building,

                Transfer Systems, like power transmission gears and shafts.


                engineering industries and structural use applications, such as: heavy
                duty shafts, gears, axles, spindles, couplings, pins, chucks, molds etc.

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