1. What is the application of ST37-2 carbon steel pipe?
Answer: ST37-2 is a carbon steel pipe complying with the German DIN 17100 standard, equivalent to Q235B in China. It is a low-carbon steel with good weldability and ductility, mainly used in mechanical manufacturing, construction, low-pressure fluid transportation and other fields.
2. What is the tensile strength range of ST37-2 carbon steel pipe?
Answer: The tensile strength of ST37-2 carbon steel pipe is 340-470 MPa, the yield strength is ≥ 235 MPa, and it has good plasticity, which is easy to process and form.
3. What is the grade of carbon steel pipe commonly used in boiler water supply pipelines?
Answer: The commonly used grade is A106 Grade B. It has good high-temperature resistance and pressure-bearing capacity, which can meet the working conditions of boiler water supply (high temperature, medium and high pressure), and complies with the requirements of boiler pipe standards.
4. Can API 5L Grade X52 carbon steel pipe be used for offshore oil pipelines?
Answer: Yes. API 5L Grade X52 is a high-strength carbon-manganese steel pipe with a minimum yield strength of 355 MPa. It has good toughness, corrosion resistance and fatigue resistance, and is widely used in offshore and onshore oil and gas pipelines.
5. What is the difference between seamless and welded carbon steel pipes of the same grade (e.g., A106 Grade B)?
Answer: Seamless pipes are made by piercing and rolling, with no welding seams, good pressure-bearing capacity and high uniformity, suitable for high-pressure and high-temperature scenarios; welded pipes are made by welding steel plates, with lower cost, suitable for low and medium pressure, non-critical load scenarios.
