ASTM A519 1025 Seamless Mechanical Tubing (UNS G10250)
ASTM A519 1025 (UNS G10250) seamless mechanical tubing is a medium-carbon steel grade known for its balanced strength, machinability, and formability. It is widely used in precision engineering, automotive components, structural parts, and machinery applications that demand excellent dimensional accuracy and durability. With its higher carbon content than 1020, A519 1025 provides improved hardness and wear resistance while remaining easy to machine and weld. The grade performs well under cold finishing operations, heat treatment, carburizing, forging, and bending, making it a versatile material for industrial use.
Key Features
- Medium-carbon seamless mechanical steel tubing
- Superior strength and wear resistance
- Good machinability & formability
- Excellent dimensional precision and surface finish
- Suitable for heat treatment & carburizing
- Reliable for heavy-duty mechanical & structural uses
- Available in cold-drawn and hot-finished conditions
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | G10250 |
| SAE | 1025 |
| AISI | 1025 |
| JIS | S25C |
| EN | C25E / C25R |
Available Sizes
- Outside Diameter (OD): 10 mm to 323.9 mm
- Wall Thickness: 1 mm to 40 mm
- Length: 4–7 m (SRL), 7–13 m (DRL), Custom lengths
ASTM A519 1025 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.22 – 0.28 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.050 max |
| Silicon (Si) | 0.10 – 0.35 |
| Iron (Fe) | Balance |
ASTM A519 1025 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 – 550 MPa |
| Yield Strength | 240 MPa (min) |
| Elongation | 25% (min) |
| Hardness | 111 – 163 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Elastic Modulus | 200 GPa |
| Melting Point | ~1510°C |
| Thermal Conductivity | 51 W/m·K |
Types of Grade 1025 Tubes
- Seamless Mechanical Tubing
- Cold Drawn Seamless (CDS) Tubing
- Hot Finished Seamless (HFS) Tubing
- DOM Tubing
- Annealed Tubing
- Normalized Tubing
- Quenched & Tempered Tubing
- Carburizing Quality Tubing
- Cut-to-Length Tubes
Applications
- Automotive components
- Hydraulic cylinder barrels
- Shafts, axles, and spindles
- Bushings and sleeves
- Machinery parts
- Structural and mechanical assemblies
- Precision engineering components
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