ASTM A519 Grade 1008 Seamless Carbon Steel Tubing
ASTM A519 Grade 1008 Carbon Steel Seamless Tube for Automotive and Structural Applications
Explore ASTM A519 Grade 1008 carbon steel seamless tubing for mechanical and structural applications. Chemical composition, mechanical properties, thermal and electrical characteristics, equivalent grades, and usage guide.
Cold drawing, hot rolling, normalizing, stress relieving, machining, welding, bending
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ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Introduction
ASTM A519 Grade 1008 is a low-carbon steel grade defined under ASTM A519, the standard specification for seamless carbon and alloy steel mechanical tubing. This material is characterized by its excellent cold formability, good weldability, and moderate strength, making it suitable for a wide range of automotive and structural applications.
Chemical composition is tightly controlled with maximum carbon content of 0.10%, manganese in the range of 0.30–0.50%, and low levels of phosphorus and sulfur, ensuring consistent ductility and toughness. Typical mechanical properties in the as-drawn or stress-relieved condition include a minimum tensile strength of 345 MPa (50 ksi) and minimum yield strength of 275 MPa (40 ksi), with elongation no less than 20% in 2 inches.
Physical properties reflect those of common low-carbon steel, including a density of about 7.85 g/cm³, an elastic modulus of 200 GPa, and a thermal expansion coefficient of 12.1 µm/m·°C. The tubing is supplied in various conditions: cold-finished, hot-finished, normalized, or stress-relieved, and can be used for manufacturing components that require tight dimensional tolerances and smooth surface finish.
This grade is widely used in automotive drive shafts, suspension parts, hydraulic cylinders, and structural frames, where cost-effectiveness and reliable performance are required.
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Chemical Composition
The chemical composition of ASTM A519 Grade 1008 is defined by the standard to ensure consistent mechanical properties and weldability. The following table lists the specified limits for each controlled element. Note that some elements like silicon and aluminum may be present as residuals but are not explicitly required.
| Element | Specified Value | Remarks |
|---|---|---|
| Carbon (C) | 0.10 max | Ladle analysis |
| Manganese (Mn) | 0.30 – 0.50 | Ladle analysis |
| Phosphorus (P) | 0.035 max | Ladle analysis |
| Sulfur (S) | 0.035 max | Ladle analysis |
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Thermal and Electrical Physical Properties
The following physical properties are typical for low-carbon steels such as 1008. These values are not specified by ASTM A519 but are derived from common material reference data and can be used for design calculations. Actual values may vary slightly depending on specific processing and microstructure.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated, room temperature |
| Poisson Ratio (ν) | 0.29 | -- | Room temperature, typical |
| Thermal Expansion Coefficient (α) | 12.1 | µm/m·°C | 20–100 °C |
| Thermal Conductivity (λ) | 51.9 | W/m·K | Room temperature |
| Specific Heat Capacity (cp) | 486 | J/kg·K | Room temperature |
| Electrical Resistivity (ρe) | 0.142 | µΩ·m | Room temperature |
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Mechanical Properties
Mechanical properties are dependent on the heat treatment or cold-working condition. The values below represent the minimum requirements according to ASTM A519 for Grade 1008 in the as-drawn or stress-relieved condition. Actual test results may vary and are often higher due to processing.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 345 min | MPa | Room temperature, as-drawn |
| Yield Strength (ReH) | 275 min | MPa | 0.2% offset, room temperature, as-drawn |
| Elongation (A) | 20 min | % | In 2 in. (50 mm) gauge length, as-drawn |
| Hardness (HBW) | 121 max (typical 100 – 110) | -- | Approximate, as-drawn condition |
| Bend Test | No cracking when bent 180° around a mandrel diameter equal to the tube OD | -- | As agreed between manufacturer and purchaser |
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A519 | 1008 | Original standard; seamless mechanical tubing |
| Europe | EN 10305-1 | E235 | Seamless cold-drawn tubing; comparable carbon content and strength, but slightly different Mn range |
| International | ISO 2937 | P235 | Seamless plain end steel tubes for mechanical application; similar mechanical properties |
| Japan | JIS G3445 | STKM11A | Carbon steel tubes for machine structural purposes; comparable strength, may have minor variation in chemistry |
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Application Introduction
ASTM A519 Grade 1008 is a versatile low-carbon seamless tube suitable for a variety of mechanical and structural applications where a combination of good formability, weldability, and moderate strength is required. Its excellent surface finish and dimensional accuracy in the cold-drawn condition make it ideal for precision components.
Typical industries, products, and machined components include:
Product Applications: Drive shafts, Suspension components (control arms, tie rods), Hydraulic cylinder barrels and rods, Roll cages and frame structures, Axle tubes, Bicycle frames and handlebars
Processed into products: Machined bushings and spacers, Precision cut rings and sleeves, Fasteners and threaded parts, Bent and formed structural members, Welded assemblies (after preheating and appropriate filler metal), Stamped and drawn cups (when tube is processed into blanks)
Application industries: Automotive manufacturing, Construction and structural engineering, Hydraulic and pneumatic systems, Agricultural machinery, Bicycle and motorcycle manufacturing, General machinery and equipment
ASTM A519 Grade 1008 Seamless Carbon Steel Tubing Similar / Close Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A519 | 1010 | Slightly higher carbon (0.08–0.13 Mn:0.30–0.60), provides higher strength but less ductility; often used for similar parts when a little more strength is needed. |
| USA | ASTM A519 | 1020 | Higher carbon (0.18–0.23) and Mn (0.30–0.60); suitable where higher mechanical properties are required after heat treatment. |
| USA | ASTM A513 | 1008 | Electric-resistance-welded (ERW) tubing; similar chemistry but produced by welding; mechanical properties may differ slightly. |
| Europe | EN 10305-2 | E235 | Welded cold-drawn tubes; offers comparable chemistry and properties but different manufacturing process. |
Notes:
- Material is typically supplied in the as-cold-drawn, stress-relieved (SR), or normalized condition. Different conditions influence final mechanical properties and machinability.
- Hardness and tensile strength can be increased by cold working; subsequent stress relieving can reduce residual stresses without significantly affecting strength.
- Welding should follow common practices for low-carbon steel; preheating is generally not required for thin sections, but stress relief after welding is recommended for critical applications.
- For corrosion protection, the tubing can be coated, painted, or galvanized. The raw surface is susceptible to atmospheric corrosion and should be stored in dry conditions.
- All data is based on ASTM A519 standard and typical values; it is the user's responsibility to verify suitability for specific design requirements.
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