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1020 steel chemical composition
service
Weight Table

 Grade Designation           Carbon%              Manganese%            Phosphorus%        Sulfur%

1018

0.15–0.20

0.60–0.90

0.040

0.050

1020

0.18–0.23

0.30–0.60

0.040

0.050

1021

0.18–0.23

0.60–0.90

0.040

0.050

1022

0.18–0.23

0.70–1.00

0.040

0.050

1025

0.22–0.28

0.30–0.60

0.040

0.050

1026

0.22–0.28

0.60–0.90

0.040

0.050

1030

0.28–0.34

0.60–0.90

0.040

0.050

1035

0.32–0.38

0.60–0.90

0.040

0.050

1040

0.37–0.44

0.60–0.90

0.040

0.050

1045

0.43–0.50

0.60–0.90

0.040

0.050

1050

0.48–0.55

0.60–0.90

0.040

0.050

1518

0.15–0.21

1.10–1.40

0.040

0.050

1524

1541

                 0.19–0.25

                  0.36–0.44

1.35–1.65

1.35–1.65

        0.040

        0.040

          0.050

         0.050

Specification Table
service

AISI 1020 chemical composition is alow tensile carbon steel having  low hardenability properties with a Brinell hardness of 118 – 235, and a tensile strength of 420-790 MPa.

SAE 1020 chemical compostion steel has  high machinability, high strength, high ductility and good weldability. It is normally used in turned and polished or a cold drawn condition. It is resistant to induction hardening or flame hardening due to its low carbon content . Due to lack of alloying elements, it will not respond to nitriding, but carburization is possible in order to obtain case hardness . The core strength will remain the same. Alternatively, carbon nitriding can be performed, offering certain benefits over standard carburizing.

AISI 1020 steel can be largely utilized in all industrial sectors in order to enhance weldability,ductility  or machinability properties. It is used in a variety of applications due to its cold drawn or turned and polished finish property.

1020 Chemical Composition

The chemical composition of AISI 1020 steel is;

Element

Content

Carbon, C

0.17 - 0.230 %

Iron, Fe

99.08 - 99.53 %

Manganese, Mn

0.30 - 0.60 %

Phosphorous, P

≤ 0.040 %

Sulfur, S

≤ 0.050 %

Physical Properties

The physical properties of AISI 1020 steel are;

Physical Properties

Metric

Imperial

Density

7.87 g/cc

0.284 lb/in³

 

Mechanical Properties

The mechanical properties of AISI 1020 steel are;

Mechanical Properties

Metric

Imperial

Hardness, Brinell

111

111

Hardness, Knoop (Converted from Brinell hardness)

129

129

Hardness, Rockwell B(Converted from Brinell hardness)

64

64

Hardness, Vickers (Converted from Brinell hardness)

115

115

Tensile Strength, Ultimate

394.72 MPa

57249 psi

Tensile Strength, Yield

294.74 MPa

42748 psi

Elongation at Break (in 50 mm)

36.5 %

36.5 %

Reduction of Area

66.0 %

66.0 %

Modulus of Elasticity (Typical for steel)

200 GPa

29000 ksi

Bulk Modulus (Typical for steel)

140 GPa

20300 ksi

Poissons Ratio

0.290

0.290

Charpy Impact

@Temperature -30.0 °C/-22.0 °F

16.9 J

12.5 ft-lb

@Temperature -18.0 °C/-0.400 °F

18.0 J

13.3 ft-lb

@Temperature -3.00 °C/26.6 °F

20.0 J

14.8 ft-lb

@Temperature 10.0 °C/50.0 °F

24.0 J

17.7 ft-lb

@Temperature 38.0 °C/100 °F

41.0 J

30.2 ft-lb

@Temperature 65.0 °C/149 °F

54.0 J

39.8 ft-lb

@Temperature 95.0 °C/203 °F

61.0 J

45.0 ft-lb

@Temperature 150 °C/302 °F

68.0 J

50.2 ft-lb

Izod Impact

125 J

92.2 ft-lb

Shear Modulus (Typical for steel)

80.0 GPa

11600 ksi

 

Machining

In the cold drawn or turned and polished condition, AISI 1020 steel has highly  machinable . Following the recommendations of machine manufacturers, AISI 1020 steel can be used for drilling, turning, milling and tapping operations using suitable feeds, tool type and speeds.

Weldability

AISI 1020 steel chemical compostion can be welded by performing the most common welding processes. Most important ones are in manufacturing ERW pipes. In the cold drawn or turned and polished condition, it has better weldability. It should be kept in mind that the welding process should not be performed in heat treated or carburized condition.

Heat Treatment

Annealing

AISI 1020 steel is heated at 870°C - 910°C followed by a period of holding for a specific amount of time, until the temperature remains constant all over the section. It is then cooled in a furnace.

Carburizing

AISI 1020 is heated to between 880°C - 920°C in a suitable carburizing atmosphere followed by holding for a sufficient amount of time to produce the required carbon content and case depth. After this, refining/hardening and tempering processes are carried out to optimize the core and case properties.

Core Refining

AISI 1020 steel is slowly cooled and re-heated at 870°C - 900°C followed by a period of holding until the temperature remains constant all over the section and is quenched in water, oil or brine.

Case Hardening

After performing the core refining process, it is re-heated to 760°C - 780°C followed by a period of holding until the temperature is consistent all over the section. It is then quenched in water.

Tempering

At Bhalla Fasteners which is the leading fasteners manufacturer,supplier abd exporter of fasteners AISI 1020 steel is re-heated at 150°C - 200°C followed by a period of holding for a certain time until the temperature remains constant throughout the section. It is soaked for 1 hour per 25 mm of section, and then cooled under normal atmosphere. By performing the tempering process, the toughness of the case will be improved and grinding cracks will be reduced.

Normalizing

AISI 1020 steel is heated at 890°C - 940°C followed by a period of holding until the temperature remains constant throughout the section. It is soaked for 10 - 15 minutes and then cooled in still air.

Stress Relieving

AISI 1020 steel is heated to 650°C - 700°C followed by holding until the temperature remains constant all over the section and soaking for 1 hour per 25 mm of section. It is then cooled in still air.

Applications

AISI 1020 steel is used in case hardened condition and used for simple structural applications such as cold headed bolts or

AISI 1020 steel is also used to manufacture axles, automobile sector ,gear shafts ,general engineering and machinery parts and components, shafts and camshafts, gudgon pins, ratchets, light duty gears and spindles.

Bhalla Fasteners which is  leading manufacturer & supplier of Bolts & Nuts of all Kinds (Cold and Hot forged), Rivets, Studs & Precision Fasteners both in Mild steel as well as in Alloy steel confirming to various National & International Standardsmakes fasteners conforming to aisi 1020 steel chemical composition.