Sanitary tube and pipe

Here’s a simplified version of the text, without using numbers:

- Poor quality steel pipes often fold. This happens when cheap manufacturers apply too much pressure during production. These folds run along the pipe and cause it to crack when bent, significantly weakening the steel.

- The surface of low-quality steel pipes often has pits and dents. This is because of worn-out rolling equipment used by manufacturers trying to save money.

- Low-quality steel pipes are prone to scars on their surface. This is due to two main reasons: the material is uneven and full of impurities, and the manufacturers use poor equipment that causes steel to stick and form scars during rolling.

- Cracks can easily appear on the surface of bad-quality steel pipes. This happens because the raw material has air pockets and cools unevenly, leading to cracks when pressure is applied during production.

- Poorly made steel pipes are easily scratched because the manufacturers’ equipment is not good. These scratches weaken the steel.

- Cheap steel pipes don’t have a metallic shine. Instead, they look light red or like pig iron. This is because of poor-quality raw materials and improper temperature control during production.

- The thickness of the steel bars in low-quality pipes is often inconsistent, with some areas not properly filled. This happens because manufacturers apply too much pressure in early production stages to save material, which results in weak pipes.

- The cross-section of low-quality steel pipes is often oval instead of round. This happens when manufacturers reduce the amount of material used to save costs, which weakens the pipes and makes them fail to meet shape and strength standards.

- High-quality steel has consistent composition and cleanly cut ends. In contrast, poor-quality steel often has rough, uneven ends because of the inferior material used. Manufacturers also try to save material by cutting fewer parts, leaving the ends misshaped.

- Low-quality steel contains impurities and is less dense, which makes it lighter than it should be. You can often identify shoddy steel by weighing it, as it will weigh less than the standard amount allowed.

- The inner diameter of cheap steel pipes is inconsistent. This happens because the steel temperature is unstable and equipment is poor, causing the steel to be uneven and prone to breaking.

- High-quality steel pipes have trademarks and markings that are standardized and properly printed.

- In pipes with a diameter of 16mm or more, good-quality pipes have trademarks spaced consistently apart.

- Poor-quality steel pipes often have wavy longitudinal ribs.

- Shoddy steel pipes are loosely packed without proper alignment, and their sides are often oval-shaped.