Stainless steel features

Stainless steel is classified into austenitic stainless steel, ferritic stainless steel, duplex stainless steel, martensitic stainless steel, and precipitation hardening stainless steel according to its structure.

Austenitic stainless steel

Austenitic stainless steel is the most important type of stainless steel, and its production and consumption accounts for 70% of the total stainless steel. According to alloying methods, austenitic stainless steel can be divided into two major categories: chromium nickel steel and iron chromium manganese steel. The former uses nickel as the austenitizing element and is the main body of austenitic steel; the latter is a nickel-saving steel that replaces expensive nickel with manganese and nitrogen.

Generally speaking, austenitic steels have good corrosion resistance, good comprehensive mechanical properties and process performance, but low strength and hardness.

Second, ferritic stainless steel

Ferritic stainless steel contains 11%-30% of chromium, basically does not contain nickel, is a nickel-saving steel, in the use of state, the main structure of ferrite.

Ferritic stainless steels have higher strength, lower tendency to cold work hardening, excellent local corrosion resistance such as resistance to chloride stress corrosion, pitting, and crevice corrosion, but are sensitive to intergranular corrosion and poor low temperature toughness.

Three, duplex stainless steel

It is generally believed that the existence of 15% or more of ferrite on the austenite matrix, or the presence of 15% or more of austenite on the ferrite matrix can be referred to as austenite + ferrite duplex stainless steel.

Duplex stainless steel combines the advantages of austenitic steel and ferritic steel.

Fourth, martensitic stainless steel

Martensitic stainless steel is a kind of steel that can be adjusted by means of heat treatment. Its strength and hardness are high.

Fifth, precipitation hardened stainless steel

Precipitation-hardening stainless steel is a steel that is obtained by precipitation of carbides in steel by heat treatment so as to increase the strength.

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