Rapid Delivery for AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220 Wholesale to Albania

Rapid Delivery for AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220 Wholesale to Albania

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AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel,generally supplied in the as rolled condition with a maximum hardness HB 255max. SAE steel 8620 offers high external strength and good internalstrength, making it highly wear resistant. AISI 8620 steel has a highercore strength than grades 8615 and 8617. SAE 8620 alloy steel isflexible during hardening treatments, thus enabling improvement ofcase/core properties. Pre hardened and tempered (uncarburized) 8620 canb...


  • 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 8620 Steel


    is a low alloy nickel, chromium, molybdenum case hardening steel,
    generally supplied in the as rolled condition with a maximum hardness HB


    255max. SAE steel 8620 offers high external strength and good internal
    strength, making it highly wear resistant. AISI 8620 steel has a higher
    core strength than grades 8615 and 8617.

    SAE 8620 alloy steel is
    flexible during hardening treatments, thus enabling improvement of
    case/core properties. Pre hardened and tempered (uncarburized) 8620 can
    be further surface hardened by nitriding but will not respond
    satisfactorily to flame or induction hardening due to its low carbon
    content.

    Steel 8620 is suited for applications which require a
    combination of toughness and wear resistance. This grade is commonly
    supplied in round bar.


    1. AISI 8620 Steel Supply Range

    8620 Round Bar: diameter 80mm – 1200mm
    8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
    8620 Square Bar: 140mm – 460mm
    8620 tubes are also available against your detailed request.
    Surface Finish: Black, Rough Machined, Turned or as per given requirements.

    2. SAE 8620 Steel Specification and Relevant Standards

    Country

    USA DIN BS BS

    Japan

    Standard

    ASTM A29 DIN 1654 EN 10084

    BS 970

    JIS G4103

    Grades

    8620

    1.6523/
    21NiCrMo2

    1.6523/
    20NiCrMo2-2

    805M20

    SNCM220

    3. ASTM 8620 Steels & Equilvalents Chemical Composition

    Standard Grade C Mn P S Si Ni Cr Mo
    ASTM A29 8620 0.18-0.23 0.7-0.9 0.035 0.040 0.15-0.35 0.4-0.7 0.4-0.6 0.15-0.25
    DIN 1654 1.6523/
    21NiCrMo2
    0.17-0.23 0.65-0.95 0.035 0.035 ≦0.40 0.4-0.7 0.4-0.7 0.15-0.25
    EN 10084 1.6523/
    20NiCrMo2-2
    0.17-0.23 0.65-0.95 0.025 0.035 ≦0.40 0.4-0.7 0.35-0.70 0.15-0.25
    JIS G4103 SNCM220 0.17-0.23 0.6-0.9 0.030 0.030 0.15-0.35 0.4-0.7 0.4-0.65 0.15-0.3
    BS 970 805M20 0.17-0.23 0.6-0.95 0.040 0.050 0.1-0.4 0.35-0.75 0.35-0.65 0.15-0.25

    4. AISI 8620 Steel Mechanical Properties

      8620 Physical Properties:

      Density (lb / cu. in.) 0.283
      Specific Gravity 7.8
      Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.1
      Melting Point (Deg F) 2600
      Thermal Conductivity 26
      Mean Coeff Thermal Expansion 6.6
      Modulus of Elasticity Tension 31

        8620 Steel Mechanical Properties

        Properties Metric Imperial
        Tensile strength 530 MPa 76900 psi
        Yield strength 385 MPa 55800 psi
        Elastic modulus 190-210 GPa 27557-30458 ksi
        Bulk modulus (typical for steel) 140 GPa 20300 ksi
        Shear modulus (typical for steel) 80 GPa 11600 ksi
        Poisson’s ratio 0.27-0.30 0.27-0.30
        Izod Impact 115 J 84.8 ft.lb
        Hardness, Brinell 149 149
        Hardness, Knoop (converted from Brinell hardness) 169 169
        Hardness, Rockwell B (converted from Brinell hardness) 80 80
        Hardness, Vickers (converted from Brinell hardness) 155 155
        Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel) 65 65

        5. Forging of Material 8620 Steel

        AISI


        8620 alloy steel is forged at a start temperature of around 2250oF
        (1230oC) down to approximately 1700oF(925oC.) prior to the hardening
        heat treatment or carburizing. The alloy is air cooled after forging.

        6. ASTM 8620 Steel Heat Treatment

          Annealing

          AISI


          8620 steel may be given a full anneal by heat to 820℃ – 850℃, and hold
          until temperature is uniform throughout the section and cool in furnace
          or air cooled.

            Tempering

            Tempering


            of heat treated and water quenched parts of 8620 steels (not
            carburized) is done at 400 F to 1300 F to improve case toughness with
            minimal effect on its hardness. This will also reduce the possibility of


            grinding cracks.

              Hardening

              The


              AISI steel 8620 will be austenitized at around 840°C – 870°C, and oil
              or water quenched depending upon section size and intricacy. Cool in Air


              or Oil required.

                Normalizing

                1675oF


                (910oC) and air cool. This is another method of improving machinability


                in 8620 material; normalizing might also be used prior to case
                hardening.

                7. Machinability of SAE 8620 Steel

                The


                8620 alloy steel is readily machined after heat treatment and/or
                carburizing, should be at a minimum so as not to impair the hardened
                case of the part. Machining may be done by conventional means prior to
                heat treatment – after carburizing machining is usually limited to
                grinding.

                8. Welding of 8620 Materials

                The
                alloy 8620 may be welded as rolled condition by conventional methods,
                usually gas or arc welding. Preheating at 400 F is beneficial and
                subsequent heating after welding is recommended – consult the approved
                weld procedure for the method used. However, welding in the case
                hardened or through hardened condition is not recommended

                9. Application of ASTM 8620 Steel

                AISI


                8620 steel material is used extensively by all industry sectors for
                light to medium stressed components and shafts requiring high surface
                wear resistance with reasonable core strength and impact properties.

                Typical


                applicationsare: Arbors, Bearings, Bushings, Cam Shafts, Differential
                Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts,
                Ratchets, Sleeves and other applications where it is helpful to have a
                steel that can be readily machined and carburized to controlled case
                depths.

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