JIS G7223 TW 320 Introduce
JIS G7223 is a Japanese steel that has excellent chemical properties and is suitable for a variety of applications. It has high levels of strength and ductility, combined with good weldability and corrosion resistance. Its low alloy content makes it resistant to stress corrosion cracking, and its low carbon content makes it easy to work with and weld. It is an ideal material for many engineering and structural applications.
Smelting temperature:1549°C - 1978°C
Application:Welded pressure steel pipes - Technical delivery conditions - Part 1: Non-alloy steel tubes
JIS G7223 TW 320 Material Mechanical Properties
Corrosion resistance is also an important aspect of JIS G7223 TW 320 steel that must not be overlooked. This type of steel is resistant to most types of corrosion and can be used in many different environmental conditions.
The mechanical properties of the JIS G7223 TW 320 steel are as follows:
| YieldRp0.2 | ≤ 443 (MPa) |
| TeileRm | ≤ 862 (MPa) |
| ImpactKV/Ku | 22(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 441 |
JIS G7223 TW 320 Material Thermal Properties
The thermal performance parameters of the JIS G7223 TW 320 steel are as follows:
| Temperature (°C) | 22 | 957 | 298 |
| Modulus of elasticity (GPa) | - | 624 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 234 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 242 |
| Poisson’s coefficient, ν | - | - | 413 |
JIS G7223 TW 320 Material Machining Technology
JIS G7223 TW 320 is a medium carbon, 0.3-0.5% Niobium, low alloy steel designation. It is also known by the trade names "Niobium Steel," "Niobium Alloy Steel," or simply "Nb Steel." In terms of physical properties, JIS G7223 TW 320 steel displays superior tensile strength, yield strength, and impact toughness when compared to SAE 1020 mild steel.