Astm a500 gr b carbon steel square steel pipe in China Dongpengboda

 As a rule, foreign customers tend to distinguish the wall thickness of pipe as per different color coating in both ends of pipe. We have two major kinds of pipe body color treatment in foreign pipe market. One is to brush different colors to make a distinction between various wall thickness of pipe. This color treatment applies to both the black steel pipe and the pre galvanized pipe. And the other is to brush a color ribbon in both ends of pipe. This treatment is usually applied to pre galvanized pipe. Before dispatch from the manufacturer's warehouse, all tubes and pipes shall be marked with the appropriate colors. Take BS1387 pipe for an example: Our products all have pretty physical appearance with smooth outside welding. Compared with some other suppliers, we use a flat knife for scraping the weld line. Besides, the visual weld geometry size is in line with the actual requirements of different applications. On the other hand, tube shape mutation is easy to cause stress concentration. If the excess part of the welding is polished off in the pipe production process, this will somewhat eliminate part of the stress concentration. In addition, our workers are all skilled in the post treatment of pipes, who all have excellent professional experience for many years.