ASTM A519 1118 (UNS G11180) Seamless Mechanical Tubing
ASTM A519 Grade 1118 (UNS G11180) seamless mechanical tubing is a medium-carbon, resulfurized steel widely used for precision machining applications. Known for its excellent machinability and dependable strength, this grade is manufactured through hot-finished or cold-drawn processes to ensure tight dimensional control and smooth surface finishes. Its sulfur-enhanced composition allows faster machining speeds, improved chip formation, and reduced tool wear, making it ideal for automotive, machinery, and CNC-based manufacturing. ASTM A519 1118 offers consistent hardness, stability, and performance, making it a preferred material in high-volume turning, drilling, and milling operations.
Key Features
- Superior machinability due to resulfurized chemistry
- Excellent strength and moderate hardness for mechanical applications
- Available in cold-drawn and hot-finished forms
- Tight tolerances and improved dimensional stability
- Suitable for high-speed CNC machining and automated production
- Clean, smooth surface finish for precision components
- Reliable performance in automotive and industrial parts manufacturing
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| SAE | 1118 |
| UNS | G11180 |
| JIS | SUM21 |
| DIN | 1.0403 (Nearest Match) |
ASTM A519 1118 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.14 – 0.20 |
| Manganese (Mn) | 1.00 – 1.30 |
| Sulfur (S) | 0.08 – 0.13 |
| Phosphorus (P) | ≤ 0.040 |
| Iron (Fe) | Balance |
ASTM A519 1118 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 440 – 620 MPa |
| Yield Strength | 300 – 400 MPa |
| Elongation | 10 – 15% |
| Hardness | 140 – 170 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 205 GPa |
| Thermal Conductivity | 51 W/m-K |
| Melting Point | ~1520°C |
Type of Grade 1118 Tube
- Seamless Mechanical Tubing
- Cold Drawn Seamless Tubing
- Hot Finished Seamless Tubing
- Normalized Tubing
- Annealed Tubing
- Precision Cut-to-Length Tubes
- Machining-Quality Tubes
Applications
- Precision machined parts
- Automotive components
- Shafts, pins, studs, and dowels
- Industrial machinery components
- CNC machined parts
- Bushings and sleeves
- Hydraulic and mechanical system parts
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