In industries such as construction, manufacturing, and petroleum, welded steel pipe is widely used for conveying fluids, structural support, and more. However, since there are various types and qualities of welded steel pipes in the market, there are some important things that need to be paid special attention when purchasing to ensure that the quality of the steel pipe purchased is as expected and can meet the demand. The raw materials for the production of welded pipes include ordinary low-carbon steel, low-alloy steel or high-manganese steel, etc., so what should we pay attention to in the process of purchasing welded pipes? What kind of welded pipe can be considered qualified?
Precautions for purchasing welded steel pipes:
1) How to choose suppliers?
Choosing a reliable supplier is crucial. A variety of welded steel pipe suppliers exist in the market, so identifying a reliable supplier is an important step. You should look for an experienced and reputable supplier to ensure that the welded steel pipe you are purchasing meets international standards and has the necessary quality certifications. The specific inspection content is as follows:
1. Check the manufacturer's qualifications, whether the business license, organization code certificate, tax registration certificate, production and operation license and other qualification materials are complete.
2. Look at the case, examine the performance of the supplier, and the status of the projects served in the past.
3. Is there a self-built logistics fleet? Choosing a service provider with a self-built logistics fleet can reduce transportation costs, and the most important thing is to ensure timely delivery.
4. After-sales service: Whether there is a sound and reliable after-sales service guarantee system, and quality problems in the acceptance of the goods and subsequent use must be resolved in a timely manner.
2) What does the buyer need to do?
First of all, full market research and comparison should be carried out before purchasing. It is very important to know the information about the types, materials, specifications, prices, etc. of welded steel pipes in the market. You can obtain relevant information through the Internet, inquiry, visits to exhibitions, etc., and communicate with multiple suppliers to get the most suitable procurement suggestions.
Secondly, detailed specification and quantity planning of the required welded steel pipes is required before purchasing. Without a clear specification and quantity plan, it will lead to unnecessary waste or shortage, which will affect the budget and project schedule. Therefore, before purchasing, please make sure to fully analyze and evaluate the specifications, quantity and quality requirements of the required steel pipes, and clearly communicate with the supplier to ensure that the purchased steel pipes meet the needs.
In addition, in the procurement process, timely communication is the key, and being able to maintain close contact with suppliers and solve problems in a timely manner is a necessary condition to ensure the progress of procurement. In addition, asking whether the supplier provides after-sales service is also a question that cannot be ignored. Sometimes, the purchased steel pipes may have some quality problems, and the after-sales service provided by the supplier can help us solve these problems.
Acceptance criteria for welded steel pipes:
Quality testing is an essential step. When purchasing welded steel pipes, it is necessary to ensure that the supplier can provide the quality certification and test reports of the relevant products. You can require suppliers to provide relevant quality certification documents, and you can entrust a third-party organization to conduct quality inspections as needed.
1. Check whether the quality assurance materials such as the product quality certificate, material manual, and quality assurance book are complete.
2. Check the appearance of the welded pipe, the surface is smooth and flat, the weld seam is dense without burrs, no oil spot corrosion, no extrusion deformation, and the cross section is flat.
3. Use a micrometer to check whether the outer diameter and wall thickness of the welded pipe meet the requirements, and the deviation of the standard wall thickness does not exceed 3%-5%.
4. Use a flaw detector to perform non-destructive testing on welded pipes.
5. Carry out the bending and tensile strength test according to the requirements, bend the welded pipe 30 degrees, and there is no crack at the bending place.
Price, while important, is not the only consideration. Of course, price is also one of the important considerations in the procurement process, but we cannot make decisions based solely on price. Compared with lower prices, we should pay more attention to the quality of welded steel pipes and the credibility of suppliers to ensure that the purchased steel pipes meet expectations.
In conclusion:
When purchasing welded steel pipes, factors such as supplier reliability, market research and comparison, detailed specification and quantity plan, quality inspection, price, timely communication and after-sales service need to be considered. Only by comprehensively considering these factors can we make a wise decision on the purchase of welded steel pipes and ensure that the quality and performance of the purchased steel pipes meet the requirements.
Go here to learn more about " Packaging and Transportation Methods to Avoid Scratching the Steel Pipe"
