ASTM A519 Grade 8640 Introduce
ASTM A519 is a standard specification for carbon and alloy steel mechanical tubing. ASTM A519 Grade 8640 tubing is used for mechanical and pressure applications, as well as for structural support in applications where high strength and enhanced corrosion resistance are required. ASTM A519 Grade 8640 tubing is available in a variety of sizes and shapes and is used in a variety of industries. Typical applications include automotive components, structural components, agricultural implements, and various other industrial and mechanical applications. ASTM A519 Grade 8640 tubing is also used in a variety of pipes and valves, where it can be used to reduce the weight of the product while still providing superior strength and high performance.
Smelting temperature:1768°C - 1486°C
Application:Seamless carbon steel and alloy steel mechanical tube
ASTM A519 Grade 8640 Material Chemical Composition
The chemical composition of the ASTM A519 Grade 8640 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.3500 |
| Sulfur (S) | - | 0.0400 |
| PhOsphorus (P) | - | 0.0400 |
| Nickel (Ni) | 0.4000 | 0.7000 |
| Molybdenum (Mo) | 0.1500 | 0.2500 |
| Manganese (Mn) | 0.7500 | 1.0000 |
| Copper (Cu) | - | 0.3500 |
| Chromium (Cr) | 0.4000 | 0.6000 |
| Carbon (C) | 0.3800 | 0.4300 |
ASTM A519 Grade 8640 Material Mechanical Properties
Hardness is a measure of a material's resistance to surface scratching or indentation. ASTM A519 Grade 8640 steel has a Brinell hardness range of 120 to 220, depending on the grade. Higher grades of steel tend to have higher hardness.
The mechanical properties of the ASTM A519 Grade 8640 steel are as follows:
| YieldRp0.2 | ≤ 592 (MPa) |
| TeileRm | ≤ 499 (MPa) |
| ImpactKV/Ku | 14(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 211 |
ASTM A519 Grade 8640 Material Thermal Properties
The thermal performance parameters of the ASTM A519 Grade 8640 steel are as follows:
| Temperature (°C) | 13 | 793 | 978 |
| Modulus of elasticity (GPa) | - | 952 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 21 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 441 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 331 |
| Poisson’s coefficient, ν | - | - | 223 |
ASTM A519 Grade 8640 Material Machining Technology
ASTM A519 Grade 8640 can be machined using conventional methods. Generally, the material should be pre-heated to 150°C and then machined with high speed tooling. The machining of ASTM A519 Grade 8640 can be performed with a wide range of metal cutting tools such as drills, taps, reamers, end-mills, and countersinks. To ensure quality, tight machining tolerances should be observed, especially when fabricating components with complex geometries. Apart from this, it is important to note that some machining operations may require higher cutting speeds than the recommended rates. In such cases, it is recommended to increase the feeds and spindle speed, while also taking measures to cool and lubricate the cutting area.