N08020 - ASTM A479/A479M-2018

USA UNS	N08020
ASTM Specification or Grade	Alloy 20
Corresponding Standard	ASTM A479/A479M-2018 Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
Classification	Austenitic Stainless Steel

Chemical Element Composition Content (%)

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

◎ New designations established in accordance with Practice E527 and SAE J1086 published jointly by ASTM and SAE. See ASTM DS-56C, available from ASTM Headquarters.

Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
All specifications	Stabilization annealing	≥550	≥240	in 2 in.[50 mm] or 4D ≥ 30 ①	≥ 50 ②
d ≤ 50.8mm	Strain hardening	≥620	≥415	in 2 in.[50 mm] or 4D ≥ 15	≥ 40 ②

◎ d-diameter, t-thickness

① Cold-finished shapes requrie only 15%, minium, elongation.
② Reduction of area does not apply on flat bars 3/16 in. [4.80 mm] and under in thickness, as this determination is not generally made in this product size. The material shall be capable of meeting the required reduction of area where listed, but actual measurement and reporting of the reduction of area are not required unless specified in the purchase order.

1 Approximate Comparison Table Corrosion-Resistant Alloy

China		United States		Germany
GB	ISC	Commercial Grade	UNS	DIN EN/DIN	W-Nr.
NS 1403 (NS143) (0Cr20Ni35Mo3Cu4Nb)	H 08020 H 01403	Alloy 20cb3 Carpenter 20Cb3	N 08020	NiCr20CuMo	2.4660

2 Approximate Comparison Table Austenitic Stainless Steel

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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