AISI 12L14 Cold Rolled Round Bar (UNS G12144)
12L14 Cold Rolled Round Bar is a resulfurized and lead-free-machining carbon steel known for its excellent machinability, smooth surface finish, and tight dimensional tolerances. It is widely used for high-speed machining applications where strength is secondary to ease of fabrication.
Key Features
- Outstanding machinability (one of the best among carbon steels)
- Lead addition improves chip breaking and tool life
- Excellent surface finish after machining
- Tight dimensional accuracy due to cold rolling
- Suitable for high-volume production
- Not recommended for welding or heat treatment
12L14 Cold Rolled Round Bar Equivalent Grades
| Standard | Equivalent |
|---|---|
| AISI | 12L14 |
| UNS | G12144 |
| EN | 11SMnPb30 |
| DIN | 1.0718 |
| IS | IS 1570 15SMnPb14 |
Sizes
- Diameter: 3 mm to 100 mm
- Length: Random, Cut Length, or as per customer requirement
12L14 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 0.85 – 1.15 |
| Phosphorus (P) | 0.04 – 0.09 |
| Sulfur (S) | 0.26 – 0.35 |
| Lead (Pb) | 0.15 – 0.35 |
| Iron (Fe) | Balance |
AISI 12L14 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ~ 540 MPa |
| Yield Strength | ~ 415 MPa |
| Elongation | ~ 10% |
| Hardness | ~ 170 HB |
UNS G12144 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | ~1425 °C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 51.9 W/m·K |
Types of 12L14 Round Bar
- Cold Rolled Round Bar
- Cold Drawn 12L14 Bright Bar
- Precision Machining Bar
- Cut-to-Length 12L14 Bar
Applications
- High-speed CNC machining parts
- Bushings, fittings, and couplings
- Screws, bolts, and studs
- Hydraulic and pneumatic components
- Automotive and industrial machined parts
- Mass-production turned components
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