304 stainless steel pipe is the most widely used as stainless heat-resistant steel, food equipment, general chemical equipment, atomic energy industry equipment.
304 stainless steel pipe is a general-purpose stainless steel pipe, which is widely used to make equipment and parts that require good comprehensive properties (corrosion resistance and formability).
304 stainless steel pipe is the most widely used stainless steel and heat-resistant steel. For food production equipment, Xitong chemical equipment, nuclear energy, etc. 304 stainless steel pipe chemical composition specifications C Si Mn P S Cr Ni (nickel) Mo SUS304 ≤0.08 ≤1.00 ≤2.00 ≤0.05 ≤0.03 18.00-20.00 8.25~10.50 – 304 stainless steel It is a universal stainless steel material, and its rust resistance is stronger than that of 200 series stainless steel materials. High temperature resistance is also relatively good, can be as high as 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion.
304 stainless steel has strong corrosion resistance in nitric acid below the boiling temperature with a concentration of ≤65%. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids. A high-alloy steel that can resist corrosion in the air or in chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as color plating, but instead exerts the inherent surface properties of stainless steel. It is used in many A type of steel, commonly referred to as stainless steel. The representative performance is high alloy steel such as 13 chrome steel and 18-8 chrome nickel steel.
From the metallographic point of view, because stainless steel contains chromium, a very thin chromium film is formed on the surface. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium.
In layman’s terms, 304 stainless steel is steel that is not easy to rust. In fact, a part of 304 stainless steel has both rust resistance and acid resistance (corrosion resistance). The rust and corrosion resistance of 304 stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust resistance and corrosion resistance are relative. Tests show that the corrosion resistance of steel in weak media such as atmosphere and water and in oxidizing media such as nitric acid increases with the increase of chromium water content in steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel occurs. Mutation, that is, from easy to rust to not easy to rust, from no corrosion to corrosion resistance.
There are many classification methods of 304 stainless steel. According to the structure classification at room temperature, there are martensitic, austenitic, ferritic and duplex 304 stainless steel; according to the main chemical composition, it can be basically divided into two major systems: chromium 304 stainless steel and chromium-nickel 304 stainless steel; According to the use, there are 304 stainless steel with nitric acid resistance, 304 stainless steel with sulfuric acid resistance, 304 stainless steel with seawater resistance, etc. According to the type of corrosion resistance, it can be divided into 304 stainless steel with pitting corrosion resistance, 304 stainless steel with stress corrosion resistance, 304 stainless steel with resistance to intergranular corrosion, etc.; According to the functional characteristics, it can be divided into non-magnetic 304 stainless steel, free cutting 304 stainless steel, low temperature 304 stainless steel, high-strength 304 stainless steel and so on.