The difference between the size of SC and DN of galvanized steel pipe:

1.SC generally refers to the welded steel pipe , the language STEEL CONDUIT, is a shorthand for the material.

2. DN refers to the nominal diameter of the galvanized steel pipe , which is the pipe diameter indication of the pipe.

3. Galvanized steel pipes are divided into cold-galvanized steel pipes and hot-dip galvanized steel pipes. Cold-galvanized steel pipes have been banned, and the latter has been promoted by the state for temporary use. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized pipes. The Ministry of Construction and other four ministries and commissions also issued a document clarifying that the galvanized pipe will be banned as a water supply pipe from 2000. The galvanized pipe is rarely used in the cold water pipes of the new residential area. The hot water pipes in some communities use galvanized pipes. Hot-dip galvanized steel pipes are widely used in fire protection, electric power and highways.
Expanding information:

Performance impact

(1) Carbon; the higher the carbon content, the higher the hardness of the steel, but the worse its plasticity and toughness.

(2) Sulfur; it is a harmful impurity in steel. When steel with high sulfur content is subjected to pressure processing at high temperature, it is easy to be brittle and is usually called hot brittleness.

(3) Phosphorus; can significantly reduce the plasticity and toughness of steel, especially at low temperatures, this phenomenon is called cold brittleness. In high quality steel, sulfur and phosphorus should be strictly controlled. However, from another point of view, the inclusion of higher sulfur and phosphorus in low carbon steel can make it easy to cut, which is beneficial to improve the machinability of steel.

(4) Manganese; can improve the strength of steel, can weaken and eliminate the adverse effects of sulfur, and can improve the hardenability of steel. High alloy steel (high manganese steel) with high manganese content has good wear resistance. And other physical properties.

(5) Silicon; it can increase the hardness of steel, but the plasticity and toughness decrease. The steel used in electrical engineering contains a certain amount of silicon, which can improve the soft magnetic properties.

(6) Tungsten; can improve the red hardness and heat strength of steel, and can improve the wear resistance of steel.

(7) Chromium; can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel.

For general corrosion resistance, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electric steel zinc. The hot-dip galvanizing galvanized layer is thick, and the cost of electro-galvanizing is low, so there is a galvanized steel pipe.