Stainless steel pipe, according to its structure is divided into austenite size stainless steel pipes, iron element markov shape stainless steel pipe, duplex stainless steel pipe, stainless steel pipe and precipitation hardening stainless steel pipe.
A, austenite size stainless steel pipe
Austenite size stainless steel pipe is the most important type of stainless steel, the 70% of the total output and consumption of stainless steel. According to the way of alloying austenite size stainless steel can be divided into nickel chrome steel and iron chromium manganese steel two kinds big. The former is austenitizing elements with nickel, is the main body of austenitic steel; The latter is the manganese, nitrogen instead of the expensive nickel section nickel steel grade.
Overall speaking, austenitic steel corrosion resistance is good, has the good comprehensive mechanical properties and process performance, but the strength and hardness is low.
Second, the iron grain size stainless steel pipe
Stainless steel pipe containing chromium iron grain size by 11% to 30%, basic does not contain nickel, nickel steel is section, in the condition of using the organizational structure is given priority to with ferrite. Iron element size and high strength stainless steel pipe, and cold hardening tend to be low, the resistance to chloride stress corrosion, pit corrosion, crevice corrosion and local corrosion performance is good, but is sensitive to intergranular corrosion, poor toughness at low temperature.
Third, duplex stainless steel pipe
It is generally believed that there is more than 15% on austenitic matrix of ferrite, or on the ferrite matrix is more than 15% of the austenite can be called austenite plus ferrite duplex stainless steel. Austenitic steel and duplex stainless steel pipe with the advantages of ferritic steel.
Fourth, markov shape stainless steel pipe
Markov shape stainless steel is a kind of can adjust its performance by means of the heat treatment of steel, its strength and hardness is taller.
Five, the precipitation hardening stainless steel pipe
Precipitation hardening stainless steel is made by means of heat treatment in steel carbide precipitates out, so as to achieve the goal of improving strength of steel.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)