AISI 1020/S20C professional high-quality forged steel rings
|Designations||France: AFNOR CC 20|
Germany: DIN 1.0402
Italy: UNI C 20
Sweden: SS 1450
United Kingdom: B.S. 040 A 20 , B.S. 070 M 20
United States: AMS 5032 , AMS 5032B , AMS 5045 , AMS 5045C , ASTM A108 , ASTM
A29 , ASTM A510 , ASTM A519 , ASTM A544 , ASTM A575 , ASTM A576 ,
ASTM A659 , MIL SPEC MIL-S-11310 (CS1020) , SAE J403 , SAE J412 ,
SAE J414 , UNS G10200
|Density (×1000 kg/m3)||7.7-8.03||25|
|Elastic Modulus (GPa)||190-210||25|
|Tensile Strength (Mpa)||394.7||25||annealed at 870°C more|
|Yield Strength (Mpa)||294.8|
|Reduction in Area (%)||66.0|
|Hardness (HB)||111||25||annealed at 870°C more|
|Impact Strength (J)|
|123.4||25||annealed at 870°C more|
C1020 is forged from 2100 – 2300 º F down to a temperature in the
region of 1650 – 1750 º F (1150*–1280 º C down to 900 – 950 º C.).
The actual forging and finishing temperatures will depend on a
number of factors, including overall reduction during forging and
complexity of part being forged. Experience alone will determine
near exact values for these two parameters. Parts are air cooled after forging.
APPLICATIONS OF AISI 1020
This grade of steel is used for forged motor shafts, hydraulic
shafts and pump shafts, as well as machinery parts.
A significant amount of this grade of steel is used in the
as-forged condition, since it shows good machinability in this
Little is to be gained, at this carbon level, by a quenching
At this carbon level, annealing after forging may not be necessary, and depending upon the
hardness after forging and the complexity of the part being forged,
machining may be carried out on the as-forged parts. If parts are
of complex shape and hence there are structural variations
throughout the part, then normalizing is in order.
Full annealing of small C1020 forgings is carried out between 1575
and 1650 º F (860 – 900 º C) followed by furnace cooling at 50 º F
(10 º C) per hour, to 1300 º F (700 º C) and air cooling.
Normalizing is seldom carried out on carbon contents at this level,
but may be used prior to surface hardening. The normalizing
temperature range for this grade is typically 1650 – 1700 º F (900
– 930 º C) followed by air cooling. When forgings are normalized
before, say, carburizing, the upper range of the normalizing
temperature is used. When normalizing is the final treatment, the
lower temperature range is used.
This grade of steel is not normally subjected to hardening and
tempering treatments as the hardness obtained from such treatments
would not warrant their being performed. Carburizing might be
carried out at 1620 – 1690 º F (880 – 920 º C,) and carbonitriding
at 1470 – 1600 º F (800 – 875 º C,)
Hardening of the carburized case would be performed at 1430 – 1500
º F (780 – 820 º C.) followed by a water quench and a tempering treatment at 300 – 400 º F (150 – 200 º C) to improve case
toughness with a minimum effect on its hardness. Case hardness
values of Rc 60 may be obtained on carburized C1020.
For parts with a diameter less than 2” (50mm) this grade has been
found on occasion to show best machinability when normalized. Parts
over 2” (50mm) diameter might be machined following forging or
This grade of steel may be welded by all normal methods: low-carbon
electrodes are recommended.
Low-hydrogen electrodes are recommended together with preheat at
300 – 500 º F (150 – 260 º C.) to be maintained during welding,
Cool slowly and stress relieve where possible.