• ALLOY STEEL - 8620 / 1.6523 / 20NiCrMo2 Steel
 
  • 8620 / 1.6523 / 20NiCrMo2 Steel

ALLOY STEEL
8620 / 1.6523 / 20NiCrMo2 Steel

SAE 8620 Steel Mechanical Properties:

8620 has a machinability rating at 66% of B1112. Average cutting speed 127 ft/min. 8620 can be forged at 2200 down to 1800 F prior to hardening or carburizing. 8620 is excellent for welding applications.

AISI 8620 Chemical  Composition:

C Mn  Cr Mo Ni Si P S
0.18-0.23 0.7-0.9 0.4-0.6 0.15–0.25 0.4-0.7 0.15-0.35 ≤0.035 ≤0.04
  • Introduction

  • Heat Treatment

  • Applications

  • Equivalent Grade

  • 8620 Steel Introduction:

    AISI 8620 is an alloy carburizing steel when thermally treated develops a hard outer case with a soft ductile core. Carefully controlled proportions of chromium, nickel and molybdenum are responsible for the extensive use as a carburizing alloy steel, with valuable features including extreme surface hardenability and good internal strength. Has minimum distortion and growth characteristics. 8620 has good machinability and responds well to polishing.

  • AISI 8620 Steel Bar Heat Treatment:

    8620 can be hardened to 1500° F followed by water quench. Carburize at 1650° - 1700° F in an appropriate carburizing medium and oil quench to harden. Tempering of carburized parts is done at 250° - 300° F and will result in the alloy having a core strength of approximately 135,000 psi minimum. Tempering of heat treated and water quenched parts (not carburized) is done at 400° - 1300° F, with greater hardness the lower the tempering temperature.

    Annealing:

    AISI 8620 may be given a full anneal at 1550 F and slow cooling at not more than 50 F per hour down to 850 F. From there it may be air cooled.

    Tempering:

    Tempering of carburized parts is done at 250 to 300 F and this will result in the alloy having a core strength of approximately 135 ksi minimum with Rockwell C case hardness of 90. Tempering of heat treated and water quenched parts (not carburized) is done at 400 F to 1300 F with greater hardness the lower the tempering temperature.

    Hardening:

    Hardening is done by oil quench from 1675 F. See "Heat Treatment". Carburizing is accomplished at the same 1650 to 1700 F range in a carburizing "pack" or environment, followed by oil quench for thin sections or a furnace cool for heavier (over 3/4") sections. Following carburizing of heavy sections a reheat at 1575 F will enhance both case and core properties of the alloy.

  • AISI 8620 Steel Applications:

    This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.

  • 8620 Alloy Steel Equivalent Grade:

    SAE DIN EN JIS
    8620 1.6523 20NiCrMo2 SNCM220

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