UNS N08020 ASTM B473 ASTM B463 alloy 20 steel sheet
Alloy 20, also known as "super stainless steel", especially resistant to acid corrosion. Alloy 20 between stainless steel and nickel alloy, both the characteristics of both materials.
Alloy 20 is an austenitic nickel-iron-chromium-based alloy, with copper and molybdenum added. The nickel component makes it resistant to chloride stress and corrosion. Copper and molybdenum provide resistance to pitting and crevice corrosion. Chromium increases tolerance to oxidizing environments, such as nitric acid. Niobium can reduce the effect of carbide precipitation. The alloy 20 can be used with most welding methods, except for oxyacetylene welding. The alloy 20 can be thermally processed by processing austenitic stainless steel. Processing performance similar to 316 and 317 stainless
Chemical component %
|
C
|
Fe
|
Ni
|
Si
|
P
|
S
|
Mn
|
|
≤0.3
|
2.5
|
63.0~70.0
|
≤0.5
|
≤0.024
|
≤0.024
|
≤2.00
|
Mechanical /Physical properties
Tensile strength σb (MPa): ≥560
Yield point σ0.2 (MPa):≥205
percentage reduction of area ψ (%):≥50
Elongationδ5 (%):≥40
Hardness: ≤201HRB
Grain size: by JIS G4511-2007
|
Grade
|
C %
|
Si %
|
Mn %
|
P %
|
S %
|
Cr %
|
Mo
%
|
Ni
%
|
Other
|
|
201
|
≤0.15
|
≤1.00
|
5.5-7.5
|
≤0.06
|
≤0.03
|
16-18
|
-
|
3.5-5.5
|
N≤0.25
|
|
202
|
≤0.15
|
≤1.00
|
7.5-10.0
|
≤0.06
|
≤0.03
|
17-19
|
-
|
4.0-6.0
|
N≤0.25
|
|
301
|
≤0.15
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
16-18
|
-
|
6.0-8.0
|
-
|
|
302
|
≤0.15
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
17-19
|
-
|
8-10.0
|
-
|
|
303
|
≤0.15
|
≤1.00
|
≤2.00
|
≤0.2
|
≥0.015
|
17-19
|
≤0.6
|
8.0-10.0
|
-
|
|
304
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
18-20
|
-
|
8-10.5
|
-
|
|
304L
|
≤0.03
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
18-20
|
-
|
9-13
|
-
|
|
309S
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
22-24
|
-
|
12-15
|
-
|
|
310S
|
≤0.08
|
≤1.5
|
≤2.00
|
≤0.045
|
≤0.03
|
24-26
|
-
|
19-22
|
-
|
|
316
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
16-18
|
2-3
|
10-14
|
-
|
|
316L
|
≤0.03
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
16-18
|
2-3
|
12-15
|
-
|
|
317
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
18-20
|
3-4
|
11-15
|
-
|
|
321
|
≤0.08
|
≤1.00
|
≤2.00
|
≤0.045
|
≤0.03
|
17-19
|
-
|
9-13
|
Ti≥5×C
|
|
430
|
≤0.12
|
≤0.75
|
≤1.00
|
≤0.04
|
≤0.03
|
16-18
|
-
|
≤0.6
|
|
Application:
The alloy 400 is widely used and is mainly used in marine and chemical treatment environments. The main uses include valves, pumps, pump shafts, drive shafts, marine fixtures and fasteners, chemical treatment equipment, gasoline cylinders, water tanks, crude oil distillation, , Pipes, boiler feed water heaters, heat exchangers, oxygen scavengers and so on.
Corrosion resistance
Alloy 400 does not produce chloride stress corrosion cracking. In general, alloy 400 in the reduction environment corrosion resistance is good, but in the oxidation environment, corrosion resistance is poor.
In the normal temperature and high temperature environment, alloy 400 resistant to a variety of corrosion, including the vast majority of alkaline substances, salt, water (including salt water), food, organic matter.
But the material can not be used for strong oxidizing acids such as nitric acid and nitrous acid
Alloy 400 can tolerate less than 80% sulfuric acid and less than 20% hydrochloric acid.
The alloy 400, which is harmless to the alloy 400, may also cause corrosion of the alloy 400 if it contains oxide impurities such as ferric chloride, iron sulfate, chromate, nitrate, peroxide and copper.
Company Information:
Doris
Tel: 0510-88222973
Fax: 0510-88222975
Add:No.22, Xinfeng Road, Xin District, Wuxi, Jiangsu, China.
Over 16 years of specialist experience in Copper, Mould steel, steel alloy, aluminum ! Welcome to order and customized.