Stainless Steel Abbreviation: Clear Answer on SUS vs TP

Summary for stainless steel abbreviation Discussion

The thread on abbreviation for stainless steel asks what the difference is between SUS316L and TP316L, and what the full words for "TP" and "SUS" are. Bryan Chooi raises the question, and Bill Reynolds answers that SUS is a Japanese stainless steel designation while TP is an ASTM designation. He adds that, based on his understanding, both designations most likely refer to the same alloy, 316L. The exchange does not give a deeper breakdown of chemistry or standards differences, but it does clarify that the two prefixes come from different naming systems rather than necessarily indicating different materials. The practical takeaway is that the grades are likely equivalent 316L stainless steel, though the exact designation depends on the standard being used.