How thick can the wall thickness of straight seam steel pipe be?

Since the pressure of the press is limited, the thickness of the straight seam steel pipe wall can reach a maximum of 50mm. If the pressure exceeds 50mm, the pressure cannot be reached, and only seamless pipes can be used.

The thinnest straight seam steel pipe wall thickness is 8mm. Because the production of straight seam steel pipes, the first step is to press the steel plate into a circle, so the steel plate needs to have a certain thickness. If the steel plate is too thin, the press cannot crush the steel plate; if pressed to less than the thinnest level of the steel plate, severe deformation will occur. Even when produced, it is oval. Therefore, the wall thickness of the thinnest straight seam steel pipe can reach 8mm.

Can straight seam steel pipe be used as seamless steel pipe?

Nowadays, the competition in all walks of life is very fierce, and the straight seam steel pipe industry is no exception. In order to increase profits, many manufacturers use straight seam steel pipes as seamless steel pipes. This behavior is completely wrong, let's go into more detail about it below.

The straight seam steel pipe adopts submerged arc welding or resistance welding, so that the welded steel tube produced has a weld seam. The general enterprise uses a polishing machine to polish the weld seam, and after variable grinding and polishing, the weld seam will be ground. If the surface is smooth, it can be regarded as seamless steel pipe. It is invisible to professionals, and this falsification makes it impossible for equipment to detect whether it is straight seam steel pipe or seamless steel pipe. If a layer of anti-rust paint is applied, it will be more difficult to distinguish, which makes many buyers feel very distressed.

So how to distinguish straight seam steel pipe and seamless steel pipe? Seamless steel pipes are generally produced directly in steel mills, and straight seam steel pipe manufacturers cannot produce them at all. Generally, they are outsourced. When purchasing, we will try our best to ask the supplier to provide guarantees and certificates for steel pipes. And, even when they're done well, there will be marks. Generally, the weld width of straight seam steel pipe is about two centimeters. After purchasing the seamless steel pipe, if you see traces of about two centimeters on the entire steel pipe, you can cut it and check it publicly to see if there is any problem. The seamless steel pipe is coated with anti-rust paint, and we can check it with a simple and rude method, that is, cut the steel pipe directly in the middle to verify whether it is seamless. Straight seam steel pipe is welded after folding a piece of steel plate in half, and has joints.

tips: Straight seam steel pipes include LSAW pipes and ERW pipes

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