Stainless steel material：
Stainless steel material is a kind of material, has close to the mirror brightness, touch hard and cold, belongs to the more avant-garde decoration material, has excellent corrosion resistance, molding, compatibility and toughness and other series characteristics, used in heavy industry, light industry, household goods industry and building decoration and other industries.
Stainless acid resistant steel referred to as stainless steel, it is composed of stainless steel and acid resistant steel two parts, in short, can resist atmospheric corrosion of steel called stainless steel, and can resist chemical medium corrosion of steel called acid resistant steel.Generally speaking, the chromium content of Cr is greater than 12% of the steel has the characteristics of stainless steel。
Stainless steel classification：
There are many methods of classification of stainless steel, among which the most common ones are the following ones.
Metallographic structure classification:
Can be divided into austenitic stainless steel, ferrite stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardening stainless steel.
Chemical composition classification:
Basically can be divided into chromium stainless steel (such as ferrite series, martensite system) and chromium nickel stainless steel (such as austenite system, abnormal series, precipitation hardening series) two systems.
According to the type of corrosion resistance:
It can be divided into stress corrosion resistant stainless steel, pitting corrosion resistant stainless steel, intergranular corrosion resistant stainless steel, etc.
Classified by functional features:
Can be divided into free cutting stainless steel, non-magnetic stainless steel, low temperature stainless steel, high strength stainless steel.
There are nearly 100 kinds of stainless steel that have been included in various standards in the world, and with the progress of science and technology and the development of industry and agriculture, new stainless steel grades are also increasing.For a known grade of stainless steel, its chromium equivalent [Cr] and nickel equivalent [Ni] can be calculated according to its chemical composition, and the microstructure and properties of the steel can be estimated roughly by using the Schaeffler-Delong stainless steel microstructure chart.
Matrix classification：
1, ferrite stainless steel.Chromium 12% ~ 30%.Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other kinds of stainless steel.
2. Austenitic stainless steel.It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements.Good comprehensive performance, corrosion resistance to a variety of media.
3. Austenite-ferrite duplex stainless steel.It has the advantages of austenite and ferrite stainless steel, and has superplasticity.
Martensitic stainless steel.High strength, but poor plasticity and weldability.
Stainless steel standard steel number comparison table and density table
| China | Japan |
USA
|
South Korea | The European Union | Australia | Taiwan, China | Density （ t/m3） |
|
GB/T20878
|
JIS
|
ASTM
|
KS
|
BSEN
|
AS
|
CNS
|
|
|
SUS403
|
403
|
STS403
|
—
|
403
|
403
|
7.75
|
|
|
20Cr13
|
SUS420J1
|
420
|
STS420J1
|
1.4021
|
420
|
420J1
|
7.75
|
|
30Cr13
|
SUS420J2
|
—
|
STS420J2
|
1.4028
|
420J2
|
420J2
|
7.75
|
|
SUS430
|
430
|
STS430
|
1.4016
|
430
|
430
|
7.70
|
|
|
SUS440A
|
440A
|
STS440A
|
—
|
440A
|
440A
|
7.70
|
|
|
SUS304
|
304
|
STS304
|
1.4301
|
304
|
304
|
7.93
|
|
|
SUS304L
|
304L
|
STS304L
|
1.4306
|
304L
|
304L
|
7.93
|
|
|
SUS316
|
316
|
STS316
|
1.4401
|
316
|
316
|
7.98
|
|
|
SUS316L
|
316L
|
STS316L
|
1.4404
|
316L
|
316L
|
7.98
|
|
|
SUS321
|
321
|
STS321
|
1.4541
|
321
|
321
|
7.93
|
|
|
06Cr18Ni11Nb
|
SUS347
|
347
|
STS347
|
1.455
|
347
|
347
|
7.98
|
Post time: Aug-19-2021