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Grade A194 Grade 8ML4CuN
USA UNS S31730
AISI
American Iron and Steel Institute		 317
Corresponding Standard ASTM A194/A194M-2023
Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Classification Austenitic Stainless Steel
Properties Corrosion Resistance
A194 Grade 8ML4CuN Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo N
Minimum Value - - - - - 17 15 4 3 -
Maximum Value 0.03 1 2 0.04 0.01 19 16.5 5 4 0.045
A194 Grade 8ML4CuN Mechanical Properties
product Hardness
HBW
Finished Nuts 126~300HBW
≤32HRC
≥60HRB
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States Germany United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. BS EN/BS
06Cr19Ni13Mo3 S31708 317 SUS 317 STS 317 317 S31700 X5CrNiMo 17-13 1.4449 317S16
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States Germany United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. BS EN/BS
06Cr19Ni13Mo3
(0Cr19Ni13Mo3) 		S31708 317 SUS 317 STS 317 317 S31700 X5CrNiMo 17-13 1.4449 317S16
A194Grade8ML4CuN Corresponding Standards(Same grade name, different standards)
1 ASTM A194/194M-2016
A194 Grade 8ML4CuN S31730
2 ASTM A194/A194M-2023
A194 Grade 8ML4CuN S31730 317

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