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UNS - Unified Numbering System

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The Unified Numbering System - UNS - was developed by ASTM and SAE to correlate different numbering systems for commercial metals and alloys.

The UNS number is not a specification - it is an identification number for a metal or alloy specified elsewhere. The UNS numbering categories are

UNS - Unified Numbering System
UNS SeriesMetal
A00001 to A99999 2) Aluminum and aluminum alloys
C00001 to C99999 2) Copper and copper alloys
D00001 to D99999 1) Specified mechanical property steels
E00001 to E99999 2) Rare earth and rare earthlike metals and alloys
F00001 to F99999 1) Cast irons
G00001 to G99999 1) AISI and SAE carbon and alloy steels (except tool steels)
H00001 to H99999 1) AISI and SAE H-steels
J00001 to J99999 Cast steels (except tool steels)
K00001 to K99999 1) Miscellaneous steels and ferrous alloys
L00001 to L99999 2) Low-melting metals and alloys
M00001 to M99999 2) Miscellaneous nonferrous metals and alloys
N00001 to N99999 2) Nickel and nickel alloys
P00001 to P99999 2) Precious metals and alloys
R00001 to R99999 2) Reactive and refractory metals and alloys
S00001 to S99999 1) Heat and corrosion resistant (stainless) steels
T00001 to T99999 1) Tool steels, wrought and cast
W00001 to W99999 Welding filler metals
Z00001 to Z99999

Zinc and zinc alloys

  1. Ferrous metals and alloys
  2. Nonferrous metals and alloys
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Related Topics

Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

Related Documents

AISI 310 Stainless Steel - Properties

Thermal diffusivity, specific heat capacity, density and thermal conductivity of stainless steel AISI 310 vs. temperature.

ASME - Valve Standards

An overview of the American Society of Mechanical Engineers - ASME - valve standards.

ASTM - Valve Standards

An overview of ASTM International - American Society for Testing and Materials - valve standards.

ASTM International - Volume 01.01 Steel - Piping, Tubing, Fittings

An overview of the ASTM Volume 01.01 standard.

Piping Thread Standards

Applied threaded standards used for piping connections.

Stainless Steel Classifications

Stainless steels are commonly grouped into martensitic stainless steels, ferritic stainless steels, austenitic stainless steels, duplex (ferritic-austenitic) stainless steels, and precipitation-hardening stainless steels.

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