CURABITUR ALIQUET QUAM POSUERE
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Standard Specification for ASTM A194 Grade 8MN
| Grade | A194 Grade 8MN |
| UNS | S31651 |
| Other name | Type 316N |
| 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 |
| Label | Corrosion and weldability resistance |
| Introductions | Process: Stainless steel used to manufacture Grade 8MN nuts shall be manufactured by electric arc furnace using one of the following processes (separate deoxidation and refining can be selected); 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. 8MN nuts shall be made from hot forging or cold heading, or from hot forging, hot rolled or cold drawn bar material. 8MN nut raw material: Add N element on the basis of S31600, improve the strength without reducing the plasticity, and reduce the thickness of the material. Used for parts requiring better corrosion resistance and higher strength. Scope of application of this standard ① This standard is applicable to all kinds of carbon steel, alloy steel and martensitic stainless steel nuts of 1/4 to 4 inches and M6 to M100. Also applicable to austenitic stainless steel nuts of 1/4 inch and M6 and above. These nuts are suitable for high or high pressure or high temperature and high pressure environments. Nut grades may not be changed without Buyer’s permission. ② The bar material for making nuts should be hot forged. The material can be further processed by centerless grinding or cold drawing. Austenitic stainless steels can be solution treated or annealed and strain hardened. When ordering annealed and strain-hardened austenitic stainless steel in accordance with Supplemental Requirement S1, Buyer shall take special care to fully understand the contents of Supplemental requirement S1 and Appendix X1. Supplementary requirements are optional and apply only if specified in the inquiry, contract and order. |
| A194 Grade 8MN Chemical Element Content (%) | |||||||||
| Constituent | C | Si | Mn | P | S | Cr | Ni | Mo | N |
| Min | – | – | – | – | – | 16 | 10 | 2 | 0.1 |
| Max | 0.08 | 1 | 2 | 0.045 | 0.03 | 18 | 13 | 3 | 0.16 |
| • Intentional addition of Bi, Se, Te and Pb is not allowed except for 6F, 8F and 8FA grades where Se is required. • Elements Ti and Cb not listed in the table are not required and do not need to be determined and reported |
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| A194 Grade 8MN Mechanical properties | |
| Products | Hardness HRB |
| Finished nut | 126~300HBW |
| ≤32HRC | |
| ≥60HRB | |
| China | Taiwan, China | Japan | Korea | America | Germany | |||
| GB | ISC | CNS | JIS | KS | ASTM | UNS | DIN EN/DIN | W-Nr. |
| 06Cr17Ni12Mo2N | S31658 | 316N | SUS 316N | STS 316N | 316N | S31651 | X2CrMiMoN17-11-2 | 1.4406 |
| (0Cr17Ni12Mo2N) | ||||||||
