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Grade 303
USA UNS S30300
Corresponding Standard ASTM F899-2020
Wrought Stainless Steels for Surgical Instruments
Classification Austenitic Stainless Steel
Properties Corrosion Resistance
303 Chemical Element Composition Content (%)
Component C ① Si Mn P ① S ① Cr Ni Mo ①
Minimum Value - - - - 0.15 17 8 -
Maximum Value 0.12 1 2 0.06 0.35 19 10 0.7
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
303 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
303 S30300
2 GB 2100-1980
303 ZG1Cr18Ni9
3 ASTM A320/A320M-2018
303 A320 B8F Class 1 S30300
4 ASTM A473-2018
303 S30300
5 ASTM F899-2020
303 S30300
6 ASTM A582/A582M-2012(R2017)
303 S30300
7 ASTM A959-2019
303 S30300
8 ASTM A320/A320M-2021
303 A320 B8F Class 1 S30300
9 ASTM A194/A194M-2023
303 A194 Grade 8F S30300
10 CNS 3477-2016
303
11 ASTM A 314-2025
303 S30300
12 ASTM A 473-2024(a)
303 S30300

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