Originally Posted by Scooper

Others may have different criteria for defining 'new steel', but to me it's the high strength, air-hardening, and heat treated steel alloys that began appearing in the mid-1990s. Examples (not meant to be a comprehensive list) would include Reynolds 853, Columbus tubesets in the Niobium group like Spirit and Life, True Temper S3, and some of the stainless tubesets like 953 and XCr.

EL-OS is one of the Columbus Nivacrom alloy tubesets which followed the Cyclex alloy tubesets like SL, SP, SLX, SPX, TSX, etc., but it wasn't air-hardening so wouldn't be included in my definition of new steels.