Speaking of stainless steel, it is very common in our lives. Because stainless steel has a good anti-corrosion effect, it is widely used in daily life. For example, our kitchen utensils, the stainless steel frying pans we use, and stainless steel tableware, etc. are widely used in our lives. In fact, there are many types of stainless steel. Do you know about stainless steel seamless pipes? Let's talk about it.
What is 304?
What does 304 in 304 stainless steel mean? What does this number represent? In fact, it is not difficult for us to guess in this case. Generally, it represents a model. In fact, stainless steel is specifically composed of chromium and nickel. The common 304 steel is actually austenitic stainless steel. Because different countries have different ways of expressing stainless steel, 304 stainless steel is commonly used in the United States and Japan. Other types of stainless steel are called 202, 301, etc.
304 stainless steel seamless pipe
304 stainless steel seamless pipe is a steel pipe that is resistant to weak corrosive media such as air, steam, and water, as well as chemically corrosive media such as acids, alkalis, and salts. It is also called stainless acid-resistant steel pipe. Its corrosion resistance mainly depends on the content of alloying elements, especially chromium. When the chromium content reaches about 12%, a thin oxide film will be formed on the steel surface to prevent further corrosion. In addition, 304 seamless pipes often contain nickel, molybdenum, titanium, niobium, copper, nitrogen and other elements to
Basic characteristics of 304 stainless steel
304 stainless steel is a universal stainless steel material, whose main components include about 18% chromium (Cr) and 8% nickel (Ni), and belongs to austenitic stainless steel. This alloy composition gives it excellent corrosion resistance and intergranular corrosion resistance, and can work stably in high temperature environments up to 1000-1200 degrees Celsius. The corrosion resistance of 304 stainless steel mainly depends on the chromium content. Chromium forms a thin oxide film (self-passivation film) on the surface of the steel, which effectively prevents further corrosion.
Structure and processing of 304 stainless steel seamless pipe
304 stainless steel seamless pipe is a hollow oblong steel material, which is widely used in petroleum, chemical, medical, food, light industry and mechanical instrumentation. Due to its advantages in bending and torsional strength, 304 stainless steel seamless pipe is lighter in weight than traditional materials, so it is also often used to manufacture mechanical parts and engineering structures. In addition, this pipe is also used to produce conventional weapons, artillery and shells.
Production process
The production of 304 stainless steel seamless pipe adopts a variety of processes, including
hot rolling, hot extrusion and
cold drawing. According to the different metallographic structures, they can be divided into different types, such as semi-ferrite semi-martensite, martensite and austenite. The process of 304 stainless steel determines the limitations of its performance. Generally, the
seamless steel pipe has low precision, uneven wall thickness, poor brightness of the inner and outer surfaces, and high cut-to-length cost.
Characteristics of 304 stainless steel seamless pipe
This metal pipe has the following characteristics and advantages over other types of pipes:
①304 stainless steel pipe has excellent corrosion resistance and can resist the erosion of boiling liquids with a concentration of ≤65% and most alkaline and acidic media. This is due to the chromium film formed on its surface, which can effectively isolate oxygen and prevent corrosion.
②Good processing performance: 304 stainless steel pipe has good processing performance and can meet the requirements of different customers.
③304 stainless steel pipe has outstanding performance in corrosion resistance and intergranular corrosion resistance. Its corrosion resistance is good in boiling liquids with a concentration of ≤65%, and it also has good resistance to alkaline solutions and most organic and inorganic acids.
④High cost performance: Compared with pipes made of other materials, 304 stainless steel pipe is more affordable, with good service life and performance.
Application of 304 stainless steel seamless pipe
The application field of 304 stainless steel pipe is very wide, mainly divided into the following fields:
①Construction field: used for indoor and outdoor decoration, metal pendants, ceiling parts, wall decoration and handrails, etc.
② Mechanical manufacturing: used to connect various pipelines such as steam, air, edible media, water treatment, etc., and can also be used to manufacture automobile, train, and aircraft parts.
③ Chemical industry: used in oil and gas pipelines, chemical pipelines, acid production, alkali production, fertilizers, oil product testing, natural gas refining, chemical catalysts, water pump parts, flue gas treatment and other fields.
④ Medical devices: used to manufacture medical devices such as surgical instruments, artificial kidneys, heart stents, etc.