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Grade F593 303
USA UNS S30300
Corresponding Standard ASTM F593-2017
Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
Classification Austenitic Stainless Steel
F593 303 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
F593 303 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
ksi 		Yield Point
σs
ksi 		Elongation or Extension Rate
δ
% 		Hardness
HBW
1/4 ~ 1-1/2 (Full-Size) AF 65~85 ≥20 HR (B85 max)
1/4 ~ 1-1/2 (Full-Size) A 75~100 ≥30 HR (B65~95)
1/4 ~ 5/8 (Full-Size) CW1 100~150 ≥65 HR (B95~C32)
3/4 ~ 1-1/2 (Full-Size) CW2 85~140 ≥45 HR (B80~C32)
1/4 ~ 5/8 (Full-Size) SH1 120~160 ≥95 HR (C24~C36)
3/4 ~ 1 (Full-Size) SH2 110~150 ≥75 HR (C20~C32)
1-1/8 ~ 1-1/4 (Full-Size) SH3 100~140 ≥60 HR (B95~C30)
1-3/8 ~ 1-1/2 (Full-Size) SH4 95~130 ≥45 HR (B90~C28)
1/4 ~ 1-1/2 (Machined) AF ≥60 ≥20 ≥40
1/4 ~ 1-1/2 (Machined) A ≥70 ≥30 ≥30
1/4 ~ 5/8 (Machined) CW1 ≥95 ≥60 ≥20
3/4 ~ 1-1/2 (Machined) CW2 ≥80 ≥40 ≥25
1/4 ~ 5/8 (Machined) SH1 ≥115 ≥90 ≥12
3/4 ~ 1 (Machined) SH2 ≥105 ≥70 ≥15
1-1/8 ~ 1-1/4 (Machined) SH3 ≥95 ≥55 ≥20
1-3/8 ~ 1-1/2 (Machined) SH4 ≥90 ≥40 ≥28
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

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