Stainless steel is used in production and life of the metal, stainless steel pump is commonly used transport corrosive liquid pumps, stainless steel can be corrosion is known to all, because of the different types of stainless steel, corrosion resistance is different also, ordinary stainless steel water pump
is suitable for conveying liquid corrosion, fluorine plastic pumps are applicable to transmission of strongly corrosive liquid, what kind of steel is stainless steel 201202304316 L, the following stainless steel to make all kinds of introduction;
Usually, according to the microstructure, the ordinary stainless steel can be divided into three categories: austenite size stainless steel, iron, grain size of stainless steel, martensite stainless steel.
On the basis of these three basic microstructure, for specific requirements and purpose, and derive the dual phase steel, precipitation hardening stainless steel and high alloy steel iron content lower than 50%.
In general, in addition to the alloys, austenitic stainless steel corrosion resistance is superior, low in corrosive environment, ferritic stainless steel, can be used in a mildly corrosive environment, if you want the material with high strength and high hardness, martensite stainless steel and precipitation hardening stainless steel can be used.
Stainless steel (
Is short for acid-proof stainless steel, resistant to weak corrosive medium such as air, steam, water, or with a stainless steel grade is called stainless steel;
And resistance to chemical corrosion medium (
Acid, alkali, salt and other chemical etching)
Corrosion of steel called acid-resistant steel.
Stainless steel refers to weak corrosive medium such as air, steam, water resistance and acid, alkali, salt and other chemical etching medium corrosion of the steel, also called acid-proof stainless steel.
In practical application, often called the weak corrosive medium corrosion resistant steel stainless steel, and called the resistance to chemical corrosion medium steel acid-resistant steel.
Due to the chemical composition on the difference between the two, the former does not necessarily medium resistance to chemical corrosion, while the latter are generally not rust.
The corrosion resistance of stainless steel depends on the alloy element content in the steel.
1, iron, grain size of stainless steel.
Matrix organization with body centered cubic crystal structure of ferrite,
Give priority to, magnetic, generally can't through hardening heat treatment, but the cold working can make its mild stainless steel reinforcement.
The American association of steel for 430 and 446.
2, austenite size stainless steel.
Matrix with face-centered cubic crystal structure of austenitic organization (
Give priority to, nonmagnetic, main strengthened by cold working (
And could lead to a certain magnetism)
The stainless steel.
3, a ferrite austenite (
Two phase austenite and ferrite matrix with the organization, which is generally greater than 15%, the content of a youthful appearance matrix of magnetic, can be strengthened by cold working of stainless steel, duplex stainless steel 329 is a typical.
Compared with austenitic stainless steel, dual phase steel high strength, resistance to intercrystalline corrosion and resistance to chloride stress corrosion and pitting corrosion ability were improved obviously.
4, precipitation hardening stainless steel.
Substrate for austenitic or martensite structure, and can be hardened by precipitation hardening treatment of stainless steel.
The American iron and steel institute in 600 series digital sign, such as 630, 17 - namely
5, markov shape stainless steel.
Matrix of martensite structure (
Body centered cubic or cube)
, magnetic, and its mechanical properties can be adjusted by heat treatment of stainless steel.
The American iron and steel institute in 410, 420 and 440 Numbers.
Martensite in the heat with austenitic organization, when cooling to room temperature with appropriate speed, austenitic organization can be transformed into martensite (
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