JIS G3454 STPG 38 Introduce
JIS G3454 standard defines a structural quality carbon and alloy steel pipe, which is designed to be used in high-pressure applications that involve steam or gas. Furthermore, this type of pipe is usually manufactured in sizes ranging from 1/8 inches to 2 inches, with an outside diameter range between 6.4mm and 76.4mm. In addition, the JIS G3454 STPG 38 steel pipe has a tensile strength value of somewhere between 330 and 510 MPa, as well as a yield strength ranging from 205 to 245 MPa.
Smelting temperature:1793°C - 1912°C
Application:Pressure carbon steel pipe
JIS G3454 STPG 38 Material Chemical Composition
The chemical composition of the JIS G3454 STPG 38 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 0.3500 |
| Sulfur (S) | - | 0.0400 |
| PhOsphorus (P) | - | 0.0400 |
| Manganese (Mn) | 0.3000 | 0.9000 |
| Carbon (C) | - | 0.2500 |
JIS G3454 STPG 38 Material Mechanical Properties
JIS G3454 STPG 38 steel can be thermal treated to enhance its mechanical properties. This includes annealing, normalizing, quenching and tempering. Annealing will help improve its yield strength, while tempering can increase its hardness and wear resistance. Normalizing and quenching are usually used to improve the toughness and impact resistance of the steel.
The mechanical properties of the JIS G3454 STPG 38 steel are as follows:
| YieldRp0.2 | ≤ 851 (MPa) |
| TeileRm | ≤ 399 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 321 |
JIS G3454 STPG 38 Material Thermal Properties
The thermal performance parameters of the JIS G3454 STPG 38 steel are as follows:
| Temperature (°C) | 33 | 439 | 783 |
| Modulus of elasticity (GPa) | - | 442 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 33 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 34.2 |
| Specific thermal capacity (J/kg·°C) | - | 113 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.12 | - | - |
| Deity (kg/dm³) | - | - | 322 |
| Poisson’s coefficient, ν | - | - | 232 |
JIS G3454 STPG 38 Material Machining Technology
The weldability of JIS G3454 STPG 38 steel is good as it can easily be cut and welded with the right techniques. It has adequate strength and ductility, allowing it to be welded without risk of cracking or warping. Furthermore, its impact resistance and wear resistance make it a suitable choice for welded components.