GB/T 699 20-E Introduce
GB/T 699 20-E steel is a popular steel used in many industries. It has good mechanical properties, including yield strength, ultimate strength, and elongation, as well as good corrosion resistance. These properties, combined with its low cost and easy weldability, make it an attractive choice for many applications. It is commonly used in construction, automotive, and shipbuilding industries.
Smelting temperature:1326°C - 1459°C
Application:High quality carbon structural steel
GB/T 699 20-E Material Chemical Composition
The chemical composition of the GB/T 699 20-E steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | - | 0.2500 |
| Nickel (Ni) | - | 0.3000 |
| Chromium (Cr) | - | 0.2500 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | 0.3500 | 0.6500 |
| Silicon (Si) | 0.1700 | 0.3700 |
| Carbon (C) | 0.1700 | 0.2300 |
GB/T 699 20-E Material Mechanical Properties
The mechanical properties of the GB/T 699 20-E steel are as follows:
| YieldRp0.2 | ≤ 642 (MPa) |
| TeileRm | ≤ 685 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 234 |
GB/T 699 20-E Material Thermal Properties
The thermal performance parameters of the GB/T 699 20-E steel are as follows:
| Temperature (°C) | 24 | 389 | 731 |
| Modulus of elasticity (GPa) | - | 397 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 231 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 341 |
| Poisson’s coefficient, ν | - | - | 312 |
GB/T 699 20-E Material Machining Technology
Drilling is also commonly used to machine GB/T 699 20-E steel. This involves using a drill to make holes in the steel. Various types of drills, such as drills with carbide tips, are used to drill through the steel. To ensure accuracy, the correct drill bit size must be selected and the correct setting on the drill press must be used.