1. What is the temperature resistance of Q215 welded pipes?
Q215 welded pipes have good temperature resistance in normal temperature environments (0-100℃). They can be used for transporting fluids at room temperature or low temperature, but they are not suitable for high-temperature environments (above 300℃), as high temperature will reduce their mechanical strength.
2. Can Q235 welded pipes be used in high-temperature applications?
Generally, Q235 welded pipes are not suitable for long-term use in high-temperature environments (above 350℃). At high temperatures, the yield strength and tensile strength of Q235 steel will decrease significantly, leading to pipe deformation or failure. For high-temperature applications, special heat-resistant steel grades should be selected.
3. What is the weight calculation formula for Q195, Q215, and Q235 welded pipes?
The weight calculation formula for welded pipes (per meter) is: Weight (kg/m) = 0.02466 × (Outer diameter - Wall thickness) × Wall thickness. This formula is applicable to all three grades, as their density is basically the same (about 7.85 g/cm³).
4. What is the common outer diameter range of Q195 welded pipes?
The common outer diameter range of Q195 welded pipes is 15-200 mm, which is mainly used for small-diameter pipes in civil and light industrial fields, such as water supply hoses and handrails.
5. Why is Q235 the most widely used grade for welded pipes?
Q235 is the most widely used grade because it has a good balance of strength, ductility, and cost-effectiveness. It meets the requirements of most medium and low-load applications, has excellent weldability, and the raw material cost is lower than high-strength steel, making it the first choice for welded pipe production.
