ASTM A519 1137 Seamless Mechanical Tubing
ASTM A519 1137 (UNS G11370) seamless mechanical tubing is a medium-carbon, resulfurized free-machining steel ideal for high-production machining environments. It offers a balanced combination of strength, hardness, and exceptional machinability due to added sulfur. This grade is widely used for high-precision mechanical parts, automotive components, shafts, fasteners, and CNC-machined products. Manufactured through hot-finished or cold-drawn processes, A519 Grade 1137 ensures consistent surface finish, dimensional accuracy, and stable mechanical performance under moderate stress conditions.
Key Features
- High machinability due to resulfurized composition
- Excellent strength and moderate hardness
- Suitable for high-speed machining and CNC operations
- Consistent mechanical and dimensional stability
- Available in cold-drawn and hot-finished conditions
- Smooth surface finish for precision components
- Ideal for automotive and industrial machinery parts
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| SAE | 1137 |
| UNS | G11370 |
| JIS | SUM37 |
| DIN | 1.0762 (Nearest Match) |
ASTM A519 1137 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.32 – 0.39 |
| Manganese (Mn) | 1.35 – 1.65 |
| Sulfur (S) | 0.08 – 0.13 |
| Phosphorus (P) | ≤ 0.040 |
| Iron (Fe) | Balance |
ASTM A519 1137 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 550 – 700 MPa |
| Yield Strength | 350 – 450 MPa |
| Elongation | 10 – 15% |
| Hardness | 170 – 220 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 |
Types of Grade 1137 Tubes
- Seamless Mechanical Tubing
- Cold Drawn Seamless Tubing
- Hot Finished Seamless Tubing
- Annealed Tubing
- Normalized Tubing
- Precision Cut-to-Length Tubes
- Machining-Quality Tubing
Applications
- CNC-machined parts
- Shafts, studs, and pins
- Automotive components
- Bushings and sleeves
- Industrial machinery parts
- Fasteners and turned components
- Mechanical and hydraulic system parts
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