Steel pipes can be divided into round pipes and special-shaped pipes according to the different shapes of cross-sectional areas. Because the circle area is larger under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, in the annular section under internal or external radial pressure, the force is more uniform, so the vast majority of steel pipe is round.

What chemical elements affect the quality of steel pipe?

(1) Nickel (Ni): Nickel can improve the strength of steel, but also can make steel maintain good plasticity and toughness. Influence of several main elements in steel on steel properties.

(2) Chromium (Cr): Chromium can significantly improve the strength, hardness, and wear resistance of steel, but at the same time will reduce the plasticity and toughness.

(3) Titanium (Ti): Titanium is a deoxidizing agent in steel. Reduces effectiveness sensitivity and cold brittleness. Adding a corresponding amount of titanium in steel has the ability to resist intergranular corrosion.

(4) Molybdenum (Mo): Adding molybdenum to steel can improve the mechanical properties of steel.

(5) Carbon (c): with the increase in carbon content, the yield point and tensile strength increase, but the plasticity and impact properties decrease. Too high a carbon content is easy to cause unqualified intergranular corrosion. The boundary between steel and iron is controlled by C content.

(6) Sulfur (S): Sulfur is an element in steel, which makes steel produces thermal brittleness, reduces the ductility and toughness of steel, easily causes cracks in forging, and also reduces the corrosion of steel. So the sulfur content must be kept as low as possible.

(7) Silicon (Si): Si is a deoxidizer and desulfurizer, has high strength and hardness, and can improve the hot working performance of steel.

(8) Phosphorus (P): Phosphorus is an element in steel, which increases the cold brittleness of steel, deteriorates the welding performance, reduces the plasticity, and deteriorates the cold bending performance. In general, the lower the phosphorus content in steel, the better.

(9) Nitrogen (N): Nitrogen can improve the strength, low-temperature toughness, and weldability of steel. Increase effectiveness sensitivity. The proper amount of nitrogen can improve the point corrosion resistance and strength of stainless steel

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