Stainless Steel Tubing
Alloy 20 Tubing, Stainless Steel, Instrumentation Tubing, Stainless Steel Instrumentation, Stainless Steel Hydraulic Tubing, Hydraulic Tubing, Welded Stainless Steel Tubing

Alloy 20 Tubing


Alloy 20 is an austenitic, nickel-iron-chromium-molybdenum alloy with the addition of copper. This combination makes it preferable in applications involving sulfuric, phosphoric, and nitric acids. The chromium and molybdenum content provide good pitting and crevice corrosion resistance. This grade exhibits exceptional resistance to stress corrosion cracking (SCC) induced by chlorides. Alloy 20 can be utilized in a wide variety of chemical process environments and has good performance in most acids, alkalines, salts and seawater.

Product Specifications
ASME SB729, SB464, SB468/ASTM B729,B464, B468/NACE MR0175

ALLOY 20 (UNS N08020) CHEMICAL COMPOSITION % (MAX.)
Cr
Chromium
Ni
Nickel
C
Carbon
Mo
Molybdenum
Mn
Manganese
Si
Silicon
P
Phosphorous
S
Sulfur
Fe
Iron
Cu
Copper
Nb
Niobium
19.0 - 21.0 32.0 - 38.0 0.07 2-3% 2.0 1.0 0.045 0.035 31.0 - 44.0 3.0 - 4.0 (8.0xC) 1Max

DIMENSIONAL TOLERANCES
OUTSIDE DIAMETER (OD) OD TOLERANCE WALL TOLERANCE
1/4 Tubes +/- .005 +/- 15%
3/8" Tubes +/- .005 +/- 15%
1/2" Tubes +/- .005 +/- 15%
FABRICATION
The chemical composition of Alloy 20 allows excellent formability for bending and flaring, and the addition of Niobium provides minimal carbide precipitation during welding.
TYPICAL APPLICATIONS
Piping, Heat Exchangers, Steam Condensers, Flue-Gas Desulfurization, Food Processing, Chemical Processing
SIZE RANGE
Outside Diameter (OD) Wall Thickness
1/4 - 1/2 .035" - .065"
Cold Finished and Bright Annealed Tube
MECHANICAL PROPERTIES
YIELD STRENGTH 0.2% OFFSET 35 KSI min.
TENSILE STRENGTH 80 KSI min.
ELONGATION (MINIMUM 2 INCHES) 30%

 Alloy 20 Tubing
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