AISI 1020 Carbon Steel

AISI 1020 carbon steel is a low hardenability and low tensile carbon steel which has a nominal 0.22%C and 0.55%Mn. It has excellent weldability,good machinability ,and high ductility with Brinell hardness of 119 – 235 and tensile strength of 410-790 MPa. It is normally used in turned and polished or cold drawn condition. Due to its low carbon content, it is resistant to induction hardening or flame hardening. Due to lack of alloying elements, it will not respond to nitriding. However, carburization is possible in order to obtain case hardness more than Rc65 for smaller sections that reduces with an increase in section size. Core strength will remain as it has been supplied for all the sections. Alternatively, carbon nitriding can be performed, offering certain benefits over standard carburizing.

 

 

 

Form of Supply	Size(mm)	Length(mm)
Round bar	Φ6-Φ1000	3000-10000
Square bar	100 x 100-600×600	3000-6000
Flat bar/Blcoks	Thickness :120-800	2000-6000
Width:120-1500

Surface Finish	Black-Forged	Black-Rolled	Rough Turned	Grinding	Polished	Peeled	Cold Drawn
Tolerance	(0,+5mm)	(0,+1mm)	(0,+3mm)	Best h9	Best h11	Best H11	Best H11

 

 

Grade	C	Si	Mn	P	S
1020	0.17-0.23	≤ 0.4	0.30-0.60	≤ 0.04	≤ 0.05

Germany	UK	China	Japan
C22/1.0402	EN3/070M20	20#	S20C

 

 

Modulus of elasticity [10^3x N/mm2]: 210
Density [g/cm^3]: 7.70
Thermal conductivity [W/m.K]: 51.9
Electric resistivity [Ohm mm^2/m]: 0.11
Specific heat capacity[J/g.K]: 0.46

 

 

 

Diameter mm	Tensile Strength Mpa	Yield Strength Mpa	Elongation %	Reduction of area %	Condition
≤ 16	500 – 650	≥ 340	≥20	≥50	Quenched and tempered
>16 – 40	470 – 620	≥290	≥22	≥50
≤ 16	≥430	≥240	≥24		Normalised
>16 – 100	≥410	≥3210	≥25

 

AISI 1020 carbon steel FORGING

Forging temperature:950-1200℃,air cooling after forging.

 

AISI 1020 carbon steel HEAT TREATMENT

Normalising:880 – 920°C,air cooling
Soft annealing:680 – 710°C,furnace cooling
Hardening:860 – 900°C,water quench
Tempering:550 – 660°C,air coolin

 

 

1. What are the key characteristics of AISI 1020?

AISI 1020 is a low-carbon steel known for its excellent ductility, weldability, and machinability. It offers a good balance of strength and toughness, making it easy to form and cold-work.

2. Can AISI 1020 be hardened?

It cannot be effectively hardened by standard quenching due to its low carbon content (approx. 0.20%). However, it is ideal for case hardening (e.g., carburizing), which creates a hard, wear-resistant surface while maintaining a ductile core.

 

3. AISI 1020 vs. 1018: What is the difference?

They are very similar, but 1020 has a slightly higher carbon content, making it marginally stronger. 1018 is more commonly found in cold-finished bars, whereas 1020 is the standard for hot-rolled plates and tubes.

 

4. What are its common applications?

It is widely used for general-purpose engineering parts that don't require extreme strength, such as:

Pins, shafts, and brackets.

Hydraulic tubing.

Automotive stampings and fasteners.

Structural supports.

 

5. Does it have good corrosion resistance?

No. Like most carbon steels, AISI 1020 is prone to rust. It requires surface protection-such as painting, plating (zinc/chrome), or oiling-to prevent corrosion in moist environments.

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