Firstly, poor-quality alloy steel pipes are highly prone to surface folding.

And its surface often appears with a rough texture.

The surface is also prone to scab formation.

Four: Susceptible to cracking on the surface, prone to scratching, and may develop burrs.

Five: In addition, poor-quality alloy steel pipes lack metallic luster and are often pale red or similar to cast iron in color.

Six: The cross-section of low-quality alloy steel pipes is irregular, often elliptical, with fine and low transverse ribs, and frequently underfilled. The longitudinal ribs are often wavy.

Seven: The material used in low-quality alloy steel pipes is inferior, which often leads to the cutting end face experiencing flaking and an uneven, bumpy surface.

Its materials contain a high level of impurities, the steel density is low, and the dimensions are severely out of tolerance; the inner diameter dimensions fluctuate greatly.