AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220

    AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220 2016-12-04T15:43:08+00:00

    Project Description

    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.

    aisi 8620 steel material

    1. AISI 8620 Steel Supply Range

    8620 Round Bar: diameter 8mm – 3000mm
    8620 Steel Plate: thickness 10mm – 1500mm x width 200mm – 3000mm
    8620 Square Bar: 20mm – 500mm
    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

    USADINBSBS

    Japan

    Standard

    ASTM A29DIN 1654EN 10084

    BS 970

    JIS G4103

    Grades

    8620

    1.6523/
    21NiCrMo2

    1.6523/
    20NiCrMo2-2

    805M20

    SNCM220

    3. ASTM 8620 Steels & Equilvalents Chemical Composition

    StandardGradeCMnPSSiNiCrMo
    ASTM A2986200.18-0.230.7-0.90.0350.0400.15-0.350.4-0.70.4-0.60.15-0.25
    DIN 16541.6523/
    21NiCrMo2
    0.17-0.230.65-0.950.0350.035≦0.400.4-0.70.4-0.70.15-0.25
    EN 100841.6523/
    20NiCrMo2-2
    0.17-0.230.65-0.950.0250.035≦0.400.4-0.70.35-0.700.15-0.25
    JIS G4103SNCM2200.17-0.230.6-0.90.0300.0300.15-0.350.4-0.70.4-0.650.15-0.3
    BS 970805M200.17-0.230.6-0.950.0400.0500.1-0.40.35-0.750.35-0.650.15-0.25

    4. AISI 8620 Steel Mechanical 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

    PropertiesMetricImperial
    Tensile strength530 MPa76900 psi
    Yield strength385 MPa55800 psi
    Elastic modulus190-210 GPa27557-30458 ksi
    Bulk modulus (typical for steel)140 GPa20300 ksi
    Shear modulus (typical for steel)80 GPa11600 ksi
    Poisson’s ratio0.27-0.300.27-0.30
    Izod Impact115 J84.8 ft.lb
    Hardness, Brinell149149
    Hardness, Knoop (converted from Brinell hardness)169169
    Hardness, Rockwell B (converted from Brinell hardness)8080
    Hardness, Vickers (converted from Brinell hardness)155155
    Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)6565

    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 applications are: 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.

    RFQ OF 8620 STEEL