AISI 12L14 Carbon Steel (UNS G12144)

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.

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