Sep 11 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsApplications
Introduction
Carbon steels are steels that contain only carbon as their major alloying element. These steels also contain small quantities of copper, nickel, molybdenum, aluminium and chromium. Traces of 0.4% silicon and 1.2% manganese can also be found in these steels.
The following datasheet provides an overview of AISI 1021 carbon steel.
Chemical Composition
The chemical composition of AISI 1021 carbon steel is outlined in the following table.
| Element |
Content (%) |
| Iron, Fe |
98.78-99.23 |
| Manganese, Mn |
0.60-0.90 |
| Carbon, C |
0.17-0.230 |
| Sulfur, S |
≤ 0.050 |
| Phosphorous, P |
≤ 0.040 |
Physical Properties
The following table shows the physical properties of AISI 1021 carbon steel.
| Properties |
Metric |
Imperial |
| Density |
7.858 g/cm3 |
0.2839 lb/in³ |
Mechanical Properties
The mechanical properties of cold drawn AISI 1021 carbon steel are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
470 MPa |
68200 psi |
| Yield strength |
395 MPa |
57300 psi |
| Bulk modulus (typical for steel) |
140 GPa |
20300 ksi |
| Shear modulus (typical for steel) |
80.0 GPa |
11600 ksi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (In 50 mm) |
15.00% |
15.00% |
| Reduction of area |
40.00% |
40.00% |
| Hardness, Brinell |
121 |
121 |
| Hardness, Knoop (converted from Brinell hardness) |
140 |
140 |
| Hardness, Rockwell B (converted from Brinell hardness) |
68 |
68 |
| Hardness, Vickers (converted from Brinell hardness) |
126 |
126 |
| Machinability (based on AISI 1212 steel as 100 machinability. The machinability of Group I bar, rod, and wire products can be improved by cold drawing.) |
70 |
70 |
Thermal Properties
The thermal properties of AISI 1021 carbon steel are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal conductivity (typical steel) |
49.8 W/mK |
346 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to the AISI 1021 carbon steel are given in the following table.
| ASTM A29 |
ASTM A510 |
ASTM A512 |
ASTM A513 |
| ASTM A545 |
ASTM A548 |
ASTM A576 |
ASTM A635 |
| ASTM A794 |
ASTM A830 |
SAE J1397 |
SAE J403 |
| ASTM A519 |
SAE J414 |
SAE J412 |
ASTM A659 |
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Applications
AISI 1021 carbon steel is mostly used in extruding and cold heading processes.