Alloy20 is an austenitic Ni-Fe-Cr based [SCALE STEEL]superalloy, which can be regarded as both stainless steel and nickel based alloy.
CHINA GB/T 15007
YB/T 5354 NS1403（NS143）
AMERICA Special Metals INCOLOY® alloy 020
CARPENTER CarTech® 20Cb-3®
ASTM B468[SCALE STEEL] UNS N08020
ASTM A182 F20（forge）
GERMANY VDM Metals Nicrofer ® 3620 Nb
DIN 17753 NiCr20CuMo
GRADE NS1403 N08020 2.4660
C ≤0.07 ≤0.07 ≤0.07
Si ≤1.00 ≤1.00 ≤1.00
Mn ≤2.00 ≤2.00 ≤2.00
P ≤0.030 ≤0.045 ≤0.025
S ≤0.030 ≤0.035 ≤0.015
Ni 32.0~38.0 32.0~38.0 32.0~38.0
Cr 19.0~21.0[SCALE STEEL] 19.0~21.0 19.0~21.0
Mo 2.0~3.0 2.0~3.0 2.0~3.0
Cu 3.0~4.0 3.0~4.0 3.0~4.0
Nb 8×C~1.0 Nb+Ta:
Co -- -- ≤1.5
Fe -- Remainder Other
(1) In chemicals containing [SCALE STEEL]chloride, sulfuric acid, phosphoric acid and nitric acid, it has excellent ability to resist overall corrosion, intergranular corrosion, pitting and crevit corrosion.Corrosion resistance between 316L and Hastelloy alloy.Corrosion resistance is less than 316L in some amine facilities because of the tendency to form nickel-ammonium complex compounds.
(2) The extremely low carbon content, plus niobium element helps to reduce the precipitation of carbide in the heat-affected [SCALE STEEL]zone, so it can be used in the welding state in most cases.All the common welding methods can be used successfully except oxy-acetylene.
(3) good cold forming, can be twice the radius of the material thickness of the bending, as well as tensile pressing molding operations.
(4) It also has excellent [SCALE STEEL]mechanical properties in the environment of up to 500℃.
Alloy 20 was first developed in 1951 for use in sulphuric acid and is the preferred alloy for sulphuric acid industry environments.It exhibits excellent stress corrosion cracking resistance in 20% ~ 40% boiling sulfuric acid.Because of its extraordinary corrosion resistance, the 20 alloy is now a popular choice in many [SCALE STEEL]industries such as chemical, food, pharmaceutical and plastics, and is used as a high temperature alloy in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and pipes.