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USA UNS S30300
ASTM
Specification or Grade		 303
Corresponding Standard ASTM A473-2018
Stainless Steel Forgings
Classification Austenitic Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo ①
Minimum Value - - - - 0.15 17 8 -
Maximum Value 0.15 1 2 0.2 - 19 10 0.6
Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
%
≥515 ≥205 ≥40 ≥50
1 Approximate Comparison Table Austenitic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade BS EN/BS
Y12Cr18Ni9
(Y1Cr18Ni9) 		S30317 303 SUS 303 STS 303 303 S30300 X10CrNiS 18-9 4305-303-00-I X8CrNiS 18-9
(X10CrNiS 18-9) 		1.4305 Z10CNF 18-09 X8CrNiS 18-9 1.4305 303S21
2 Approximate Comparison Table Ferritic Stainless Steel
Japan United States France European Standard Sweden United Kingdom
JIS ASTM NF EN/NF EN Numerical Grade SS BS EN/BS
SUS303 303 Z8CNF18-09 X8CrNiS18-9 1.4305 2346 303S31
3 Approximate Comparison Table Free-Cutting Steel 1
China United States Germany
GB ASTM DIN EN/DIN
Y0Cr18Ni10
(Y18-8) 		303 X2CrNiS18-8

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