A2-70, A4-80 and other performance marks indicate fasteners made of austenitic stainless steel. Because of the variety of austenitic stainless steel materials, each name is not a steel number. , but a type of steel number.
The performance mark consists of two parts: material group and performance level: the first part code ("-" before) indicates the material group; the second part number ("-" after) indicates the product's performance level, the number is the nominal tensile strength. 1/10 of (σb, N/mm*mm).
The material group is divided into three categories: A, C, and F; Class A represents austenitic steels A1 to A5;
See GB3098.6-2000 for details.
Supplement: The steel numbers in the US AISI/ASTM listed above correspond to the austenitic steel grades in China:
304-0Cr19Ni9 (0Cr18Ni9)
316-0Cr17Ni12Mo2
316L-00Cr17Ni14Mo2
317-0Cr19Ni13Mo3
317L-00Cr19Ni13Mo3(00Cr17Ni14Mo3)
Reference materials: GB3098.6-2000, etc.
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