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Standard Specification for A194 Grade 8FA

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On 2024-12-08
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Grade A194 Grade 8FA
UNS S30300
Standard ASTM A194/194M-2016
Carbon steel, Alloy steel, and Stainless steel nuts for bolts for high pressure or high temperature service, or both
Classification Austenitic stainless steel
Introductions Stainless steel for the manufacture of Grade 8FA nuts shall be manufactured by electric arc furnace using one of the following processes (separate deoxidation and refining are optional); Vacuum induction furnace; After any of the above manufacturing processes, electroslag remelting or consumable arc remelting is carried out. Steel mills shall have adequate controls to eliminate excessive non-uniformity, non-metallic inclusions, shrinkage, porosity and other defects.
It is then cooled at a rate that prevents the carbides from precipitating again.

 

A194 Grade 8FA Chemical Element Content (%)
Constituent C Si Mn P S Cr Ni Mo
Min – – – – 0.15 17 8 –
Max 0.15 1 2 0.2 – 19 10 –
① For With the exception of 6F, 8F and 8FA grades where Se is required, Bi, Se, Te and Pb are not allowed to be intentionally added.
②Elements not listed in the table Mo, Ti, Cb, N have no requirements and do not need to be determined and reported

 

A194 Grade 8FA Mechanical properties
Products Hardness
HRB
Finished nut 126~192HBW
60~90HRB

 

Approximate comparison table-Austenitic stainless steel
China Taiwan, China Japan Korea America The International Standard Organization 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
Newer Standard Specification for A335 Grade P91
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Older Standard Specification for A335 Grade P11

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