What is a fluid pipe?
Fluid pipe is a piping system used to transport liquids, gases or gas-liquid mixtures, and is widely used in industries, construction, agriculture, and municipal administration. Depending on the material, purpose, and environment, fluid pipes can be divided into many types, each with its own unique advantages and application scenarios.
Main types of fluid pipes:
1. Metal pipes: such as steel pipes and stainless steel pipes, which have high strength and good pressure resistance, are suitable for high pressure and corrosive fluids.
2. Plastic pipes: such as PVC pipes and PE pipes, which are light and corrosion-resistant, and are suitable for low or medium pressure systems.
3. Composite pipes: such as steel-plastic composite pipes and aluminum-plastic composite pipes, which combine the advantages of multiple materials and are suitable for special environments.
Standards: GB/T8163-1999, ASTM A53-98, JIS G3452-1998, JIS G3454-1998, ASTM A106, DIN 1629-1984
Pipe types | Pipe Szie(mm) | Tolerances | |
Hot rolled | OD | All | ±1% (min ±0.50mm) |
WT | All | +15%, -12.5% | |
Cold drawn | OD | 6～10 | ±0.20mm |
10～30 | ±0.40mm | ||
30～50 | ±0.45mm | ||
>50 | ±1% | ||
WT | ≤1 | ±0.15mm | |
>1～3 | +15% -10% | ||
>3 | +12.5% -10% | ||
Chemical composition and mechanical properties
Standard | Grade | Chemical composition | |||||||
C | Si | Mn | P | S | Cr | Ni | Cu | ||
GB/T8163 | 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.15 | ≤0.25 | ≤0.25 |
20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.25 | ≤0.25 | |
Q345 | 0.12-0.20 | 0.20-0.55 | 1.20-1.60 | ≤0.045 | ≤0.045 | - | - | - | |
Mechanical Properties | ||
Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation(%) |
335-457 | ≥205 | ≥24 |
410-550 | ≥245 | ≥20 |
490-665 | ≥325 | ≥21 |
