A249 Alloy 20 N08020 - ASTM A249/A249M-2018

Grade	A249 Alloy 20
USA UNS	N08020
Corresponding Standard	ASTM A249/A249M-2018 Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
Classification	Austenitic Stainless Steel

A249 Alloy 20 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	-	-	-	-	-	19	32	3	2	Nb: 8C~1.00
Maximum Value	0.07	1	2	0.045	0.035	21	38	4	3	Nb: 8C~1.00

A249 Alloy 20 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
925~1010℃, stabilization treatment	≥550	≥240	≥30	HRB ≤95

1 Approximate Comparison Table corrosion-resistant alloy

2 Approximate Comparison Table

United States	International Organization for Standardization		European Standard
UNS	ISO	Numerical Grade	Numerical Grade
N08020	X4NiCrCuMo35-20-4-3	4657-080-20-U	(1.4657)

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