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Grade F879M Class A1-55 18-9LW
USA UNS S30430
Corresponding Standard ASTM F879M-2016
Stainless steel socket button and flat countersunk head cap screws (Metric)
Classification Austenitic Stainless Steel
F879M Class A1-55 18-9LW Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value - - - - - 17 8 3
Maximum Value 0.1 1 2 0.045 0.03 19 10 4
F879M Class A1-55 18-9LW Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Impact Energy Absorption
KV2
J
M3~M20 (full size) ≥550 HRA
≥50
M3~M20 (machined) ≥550 ≥270 ≥25 ≥50
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM/AISI UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
06Cr18Ni9Cu3 S30488 XM7 SUS XM7 STS XM7 XM7 S30430 X3CrNiCu 18-9-4 4567-304-30-I X3CrNiCu 18-9 1.4567 Z3CNU 18-10 X3CrNiCu 18-9-4 1.4567
2 Approximate Comparison Table
Japan United States France European Standard United Kingdom
JIS UNS NF EN/NF EN Numerical Grade BS EN/BS
SUSXM7 S30430 Z3CNU18-09FF
Z3CNU18-10
Z3CNU18-10FF 		X3CrNiCu18-9-4 1.4567 304S17

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