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Grade WP904L
USA UNS N08904
AISI
American Iron and Steel Institute		 904L
Corresponding Standard ASTM A403/A403M-2022
Wrought Austenitic Stainless Steel Piping Fittings
Classification Austenitic Stainless Steel
WP904L Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo N
Minimum Value - - - - - 19 23 1 4 -
Maximum Value 0.02 1 2 0.045 0.035 23 28 2 5 0.1
WP904L Mechanical Properties
condition Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
%
Pipe Fittings ≥490 ≥220 Standard round specimen, or small specimen, or strip specimen
L0=4D
long: ≥28
tr: ≥20
1 Approximate Comparison Table
China Japan United States International Organization for Standardization France European Standard Sweden United Kingdom
GB ISC JIS ASTM/AISI UNS ISO Numerical Grade NF EN/NF EN Numerical Grade SS BS EN/BS
015Cr21Ni26Mo5Cu2 S31782 SUS 890L 904L N08904 X1NiCrMoCu25-20-5 4539-089-04-I Z2NCDU25-20 X1NiCrMoCu25-20-5 1.4539 2562 904S13
2 Approximate Comparison Table
China United States International Organization for Standardization European Standard
ISC UNS ISO Numerical Grade Numerical Grade
S39042 N08904 X1NiCrMoCu22-20-5-2 4656-089-04-I 1.4656①

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