| AISI 1020 steel mechanical properties in heat-treated or
cold-worked conditions |
| AISI (UNS) | Tensile strength, MPa (ksi), ≥ | Yield strength, MPa (ksi), ≥ | Elongation in 50 mm, %, ≥ | Reduction in area, %, ≥ | Hardness (HB) | Processing, condition or treatment | Sample Size, mm (in.) |
| 1020 (G10200) | 380 (55) | 205 (30) | 25 | 50 | 111 | Hot rolled | 19-31.8 mm (0.75-1.25 in.) |
| 420 (61) | 350 (51) | 15 | 41 | 121 | Cold drawn |
| Cyclic fatigue properties |
| UNS | Grade | Cyclic strength coefficient, MPa (ksi) | Fatigue strength coefficient, MPa (ksi) | Fatigue strength exponent | Fatigue ductility coefficient | Fatigue ductility exponent | Hardness (HB) |
| G10200 | SAE 1020 steel | 1205 (175) | 850 (123) | -0.12 | 0.44 | -0.51 | 108 |
Machinability
AISI SAE 1020 carbon steel machinability rating is 65 based on a
machinability rating of 100% for 1212 steel.
SAE AISI 1020 Steel Heat Treatment
The heat treatment of SAE AISI 1020 mild steel including
normalizing, annealing, austenitizing, etc.
Normalizing of AISI 1020
The typical normalizing temperature for SAE AISI 1020 mild steel is
915 °C (1675 °F).
Annealing of AISI 1020
Recommended temperature and cooling cycle for full annealing of
small carbon steel forgings (size ≤ 3 in.):
Annealing temperature is 855-900 °C (1575-1650 °F), cooling cycle
is from 855 °C (1575 °F) to 700 °C (1290 °F), furnace cooling speed
at 28 °C/h (50 °F/h), Brinell hardness is 111-149 HB.
Reheating (Austenitizing)
Reheating (austenitizing) temperatures for hardening of SAE 1020
steel is 760-790 °C (1400-1450 °F). Carburizing is commonly carried
out at 900 to 925 °C (1650 to 1700 °F).
Case Hardening
The surface hardening carburization temperature of 1020 carbon
steel is 970-955 °C, and most of them are carried out in a mixed
gas of methane and carrier gas. Hardening after carburizing is
usually achieved by direct quenching from the carburizing
temperature into water or brine.
Typical heat treatment for SAE 1020 case hardening
- Carbon temperature: 900-925 °C (1650-1700 °F), cooling method:
water or caustic;
- Reheat temperature: 790 °C (1450 °F), cooling method: water or 3%
sodium hydroxide;
- Carbonitriding temperature: 790-900 °C (1450-1650 °F), cooling
method: oil;
- Temper temperature: 120-205 °C (250-400 °F), for stress relief and
improving resistance to cracking (not mandatory).
Typical Forging Temperature
Typical forging temperature for AISI 1020 mild steel is 1290 °C
(2350 °F).
AISI 1020 Carbon Steel Welding
The recommended preheat and interpass temperatures for AISI SAE
C1020 steel:
For thickness ≤50mm (2 in.), the recommended preheat and interpass
temperature is above -12 °C (for low hydrogen); and 38 °C for other
than low hydrogen.
For thickness (t) 50< t ≤100, the recommended preheat and
interpass temperature is 93 °C (for low hydrogen); and 150 °C (for
other than low hydrogen).
Postweld heat treatment is optional, temperature is 590-675 °C
(1100-1250 °F).
Application
ASTM AISI SAE 1020 steel has many semi-finished products, such as
square steel bars, flat steel bars, round steel bars, steel plates,
which can be used to make truck, automotive and agricultural
equipment parts such as axles, mechanical parts, cold head bolts,
motor shafts, pump shafts, ratchet, light gear, gear drives, worm
gear, spindle, seat bracket, crane-cable drum, motor-brake wheel,
etc. And usually also made into steel channels, steel angles,
I-beams and H-beams.
AISI SAE ASTM 1020 Steel Equivalent Material
SAE ASTM AISI 1020 carbon steel equivalent to European EN (Germany
DIN EN, British BSI, French NF…), Japanese JISand Chinese GB
standard.
