1020 steel structure is a low hardenability and low tensile carbon steel with Brinell hardness of 119 – 235 and tensile strength of 410-790 MPa. It has high machinability, high strength, high ductility and good weldability.
1020 steel structure is used for forged motor shafts, hydraulic shafts and pump shafts, as well as machinery parts.
1020 steel structure Chemical composition：
C(％): 0.18～0.23
Mn(％): 0.30～0.60
P(％)≤: 0.040
S(％)≤: 0.050
1020 steel structure NORMALIZING
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.
1020 steel structure HARDENING
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.
1020 steel structure machining
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 rolling.
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