ASTM A519 1045 Seamless Mechanical Tubing (UNS G10450)
ASTM A519 Grade 1045 (UNS G10450) is a medium carbon steel seamless mechanical tubing designed for applications that require higher strength, excellent fatigue resistance, and superior toughness. Known for its outstanding heat-treatment response, Grade 1045 is commonly used in heavy machinery parts, high-strength shafts, forged components, hydraulic systems, and industrial equipment. Manufactured in hot-finished or cold-drawn conditions, A519 1045 provides excellent dimensional accuracy, improved hardness, and superior surface finishing, making it a trusted choice for precision-engineered mechanical applications.
Key Features
- High-strength medium carbon steel
- Excellent heat treatment response (quench & temper, normalize)
- Superior wear resistance and durability
- Seamless construction offering high structural integrity
- Ideal for heavy-duty mechanical and industrial components
- Available in CDS (Cold Drawn) & HFS (Hot Finished) forms
- High dimensional accuracy and consistent performance
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | G10450 |
| SAE | 1045 |
| AISI | 1045 |
| JIS | S45C |
| EN | C45E / C45R |
Available Sizes
- OD: 10 mm to 323.9 mm
- Wall Thickness: 1 mm to 40 mm
- Lengths: 4–7 m (SRL), 7–13 m (DRL), Custom lengths available
ASTM A519 1045 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.43 – 0.50 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.050 max |
| Silicon (Si) | 0.15 – 0.35 |
| Iron (Fe) | Balance |
ASTM A519 1045 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 – 760 MPa |
| Yield Strength | 330 MPa (min) |
| Elongation | 16% (min) |
| Hardness | 170 – 210 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Young’s Modulus | 200 GPa |
| Poisson’s Ratio | 0.29 |
| Thermal Conductivity | 51 W/m·K |
| Melting Point | ~1500°C |
Type of Grade 1045 Tube
- Seamless Mechanical Tubing
- Cold Drawn Seamless (CDS) Tubing
- Hot Finished Seamless (HFS) Tubing
- DOM Tubing
- Annealed Tubes
- Normalized Tubes
- Quenched & Tempered Tubes
- Carburizing Grade Tubing
- Precision Cut-to-Length Tubes
Applications
- Heavy-duty shafts and axles
- Hydraulic cylinder barrels
- Gears, crankshafts & connecting rods
- Industrial machinery parts
- Forged mechanical components
- Bushings, sleeves & bearings
- High-strength automotive and engineering parts
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