AISI 8620 alloy steel Processing technology AISI 8620 alloy steel mill  

1.
8620 steel has high hardenability without brittleness. It is also called DIN
1.6523 and JIS SNCM220 steel. It also has good weldability, little tendency to
form cold cracks, and good machinability and plasticity by cold deformation. It
is used to make gears, shafts, bolts, springs, hand tools, etc.AISI 8620 alloy
steel properties and 8620 steel composition as below.

2.
8620 chemical composition
Carbon C: 0.18～0.23
Silicon Si: 0.15～0.35
Manganese Mn: 0.70～0.90
ASTM8620 alloy structural steel
ASTM8620 alloy structural steel
Sulfur S: Allowable residual content≤0.035 P: Allowable residual
content≤0.035
Chromium Chromium: 0.40～0.60
Nickel Nickel: 0.40～0.70
Copper Cu: allowable residual content ≤ 0.030
Molybdenum Molybdenum: 0.15～0.25

3.AISI/SAE/ASTM 8620 Steel Heat Treatment
（1）Glow
It can be fully annealed by heating to 820 – 850℃ and holding until the
temperature is uniform throughout the section, and furnace or air-cooled.
（2）Cranking
Tempering of heat treated and water cooled parts (not carburized) is done at
400 to 1300 F to improve the toughness of the case with minimal impact on its
hardness. This also reduces the possibility of grinding cracks.
（3）Hardening
It is austenitized at around 840°C – 870°C and oil or water quenched
depending on the cross-section size and complexity. And cool it in air or oil
required.
（4）Normalize
910ºC (1675ºF) and air cooled. This is another method to improve the
machinability of 8620 steel materials. Normalizing can also be applied prior to
case hardening.
（5）Heat treatment
This alloy can be hardened by heating to 1500 F and then water quenching.
Carburize at 1650 to 1700 F in a suitable carburizing medium and oil quench to
harden. Improved properties of the carburized case and core can be obtained by
furnace cooling by carburizing at 1650-1700F and then reheating to 1575F.

4.
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