Metals Codes - 5: Tool Steel Codes
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Tool Steels depart somewhat from the AISI to UNS conversion scheme. AISI designates many tool steels with a combination of letters and numbers and UNS allows only one letter... the first one. For example, oil hardened tool steel is designated O1 or O2 and so on. Water hardened is W1, W2 and so on. High Speed Steel can be T10 and T15 and so forth. The UNS scheme has no letter system easily correlating and identifying all of these as tool steels. So the basic UNS system for some of the tool steel types is:
  • High Speed Tool Steels
    • UNS T11301 through T12015
  • Oil Hardening Tool Steels
    • UNS T31501-S31507
  • Mold Tool Steels
    • USN T51602-T51621
  • Water Hardening Tool Steels
    • UNS T72301-T72305
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label: standards, UNS, AISI,ASTM, ASE, coding, steel, stainless steel, tool steel, aluminum, copper, austenetic, martensitic, ferritic, precipitatin hardening