Sep 13 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Introduction
Carbon is the primary alloying element present in the carbon steels. They contain 0.4% silicon and 1.2% manganese. Small quantities of molybdenum, chromium, nickel, aluminium, and copper are also present in these steels. AISI 12L14 carbon steel is known as the fastest machining bar product.
The following datasheet will discuss in detail about AISI 12L14 carbon steel.
Chemical Composition
The following table shows the chemical composition of AISI 12L14 carbon steel.
|
Element |
Content (%) |
|
Iron, Fe |
97.91 - 98.7 |
|
Manganese, Mn |
0.85 - 1.15 |
|
Sulfur, S |
0.260 - 0.35 |
|
Lead, Pb |
0.15 - 0.35 |
|
Carbon, C |
0.15 |
|
Phosphorous, P |
0.040 - 0.090 |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
7.87 g/cm3 |
0.284 lb/in³ |
Mechanical Properties
The mechanical properties of the cold drawn AISI 12L14 carbon steel are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
540 MPa |
78300 psi |
|
Yield strength |
415 MPa |
60200 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 |
10% |
10% |
|
Reduction of area |
35% |
35% |
|
Hardness, Brinell |
163 |
163 |
|
Hardness, Knoop (converted from Brinell hardness) |
184 |
184 |
|
Hardness, Rockwell B (converted from Brinell hardness) |
84 |
84 |
|
Hardness, Vickers (converted from Brinell hardness) |
170 |
170 |
|
Machinability (based on 100 machinability for AISI 1212 steel) |
160 |
160 |
Thermal Properties
The thermal properties of AISI 12L14 carbon steel are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 20°C/68°F, typical steel) |
11.5 µm/m°C |
6.39 µin/in°F |
|
Thermal conductivity (typical steel) |
51.9 W/mK |
360 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to AISI 12L14 carbon steel include:
-
ASTM A576 (12L14)
-
SAE J1397 (12L14)
-
SAE J403 (12L14)
-
SAE J412 (12L14)
-
ASTM A108
-
ASTM A29
-
SAE J414
Fabrication and Heat Treatment
Machinability
The machinability rating of AISI 12L14 carbon steel is 190. It can be machined by dispersing lead particles all over the steel.