1. What is the tolerance of seamless carbon steel pipes?
The tolerance of seamless carbon steel pipes is strictly implemented according to international standards. For outer diameter tolerance: for pipes with outer diameter ≤ 100mm, the tolerance is ±0.5mm; for pipes with outer diameter > 100mm, the tolerance is ±0.8% of the outer diameter. For wall thickness tolerance: for pipes with wall thickness ≤ 10mm, the tolerance is ±10% of the wall thickness; for pipes with wall thickness > 10mm, the tolerance is ±8% of the wall thickness. The length tolerance is ±5mm per meter. We can also adjust the tolerance according to the customer's specific requirements to meet the precision needs of different applications.
2. Do seamless carbon steel pipes need heat treatment?
Whether seamless carbon steel pipes need heat treatment depends on the material and application requirements. Common heat treatment methods include annealing, normalizing, quenching and tempering. For example: 1. Low carbon steel seamless pipes (such as 20#) usually do not need heat treatment, and can be used directly after rolling; 2. Medium and high carbon steel seamless pipes need annealing treatment to reduce hardness, improve plasticity and toughness, and facilitate subsequent processing; 3. Seamless pipes used in high-temperature and high-pressure environments (such as boiler pipes) need quenching and tempering treatment to improve strength and high-temperature resistance. We will carry out corresponding heat treatment according to the material and customer needs.
3. What is the density of seamless carbon steel pipes?
The density of seamless carbon steel pipes is usually 7.85g/cm³, which is the same as that of ordinary carbon steel. The density is a fixed physical property of carbon steel, which is not affected by the specification (outer diameter, wall thickness) and processing method (hot rolling, cold drawing) of the pipe. This density value can be used to calculate the weight of the pipe: weight (kg) = (outer diameter - wall thickness) × wall thickness × 0.02466 × length (meter). We can provide a professional weight calculation tool for customers to quickly calculate the weight of the required pipes.
4. Can seamless carbon steel pipes be used for drinking water transportation?
Yes, seamless carbon steel pipes can be used for drinking water transportation, but corresponding food-grade surface treatment is required. Because ordinary seamless carbon steel pipes may rust in water, and the rust will affect the quality of drinking water. We can carry out food-grade anti-rust treatment (such as food-grade epoxy coating, nickel plating) on the inner surface of the pipe to ensure that the pipe does not release harmful substances and meets the drinking water safety standards of various countries. Before use, it is also necessary to clean the pipe to remove impurities and rust inside.
5. What certificates can you provide for seamless carbon steel pipes?
We can provide complete certificates to ensure that the seamless carbon steel pipes meet the import requirements of the customer's country or region. Common certificates include: 1. Quality Certificate (QC Certificate): proving the quality of the pipe meets the standard requirements; 2. Chemical Composition Report and Mechanical Performance Report: detailed test data of the pipe; 3. Non-destructive Testing Report: test results of ultrasonic, radiographic and other tests; 4. ISO 9001 Quality Management System Certificate: proving our production and quality management meet international standards; 5. Customs Declaration Form, Commercial Invoice, Packing List: necessary documents for export; 6. Special certificates: such as CE certificate (for European market), API certificate (for oil and gas industry), etc. We can provide corresponding certificates according to the customer's needs.
