Machinery's Handbook, 31st Edition
398
Numbering Systems FOR METALS AND ALLOYS Table 3. AISI and SAE System of Designating Carbon and Alloy Steels AISI-SAE Designation a Type of Steel and Nominal Alloy Content (%) Carbon Steels 10xx Plain Carbon (Mn 1.00% max.) 11xx Resulfurized 12xx Resulfurized and Rephosphorized 15xx Plain Carbon (Max. Mn range 1.00 to 1.65%) Manganese Steels 13xx Mn 1.75 Nickel Steels 23xx Ni 3.50 25xx Ni 5.00 Nickel-Chromium Steels 31xx Ni 1.25; Cr 0.65 and 0.80 32xx Ni 1.75; Cr 1.07 33xx Ni 3.50; Cr 1.50 and 1.57 34xx Ni 3.00; Cr 0.77 Molybdenum Steels 40xx Mo 0.20 and 0.25 44xx Mo 0.40 and 0.52 Chromium-Molybdenum Steels 41xx Cr 0.50, 0.80, and 0.95; Mo 0.12, 0.20, 0.25, and 0.30 Nickel-Chromium-Molybdenum Steels 43xx Ni 1.82; Cr 0.50 and 0.80; Mo 0.25 43BVxx Ni 1.82; Cr 0.50; Mo 0.12 and 0.35; V 0.03 min. 47xx Ni 1.05; Cr 0.45; Mo 0.20 and 0.35 81xx Ni 0.30; Cr 0.40; Mo 0.12 86xx Ni 0.55; Cr 0.50; Mo 0.20 87xx Ni 0.55; Cr 0.50; Mo 0.25 88xx Ni 0.55; Cr 0.50; Mo 0.35 93xx Ni 3.25; Cr 1.20; Mo 0.12 94xx Ni 0.45; Cr 0.40; Mo 0.12 97xx Ni 0.55; Cr 0.20; Mo 0.20 98xx
Ni 1.00; Cr 0.80; Mo 0.25 Nickel-Molybdenum Steels
46xx 48xx
Ni 0.85 and 1.82; Mo 0.20 and 0.25
Ni 3.50; Mo 0.25
Chromium Steels
50xx 51xx 50xxx 51xxx 52xxx
Cr 0.27, 0.40, 0.50, and 0.65 Cr 0.80, 0.87, 0.92, 0.95, 1.00, and 1.05
Cr 0.50; C 1.00 min. Cr 1.02; C 1.00 min.
Cr 1.45; C 1.00 min. Chromium-Vanadium Steels
61xx
Cr 0.60, 0.80, and 0.95; V 0.10 and 0.15 min Tungsten-Chromium Steels
72xx
W 1.75; Cr 0.75 Silicon-Manganese Steels
92xx
Si 1.40 and 2.00; Mn 0.65, 0.82, and 0.85; Cr 0.00 and 0.65 High-Strength Low-Alloy Steels
9xx
Various SAE grades B denotes boron steels L denotes leaded steels
xxBxx xxLxx
AISI 2xx 3xx 4xx
SAE 302xx 303xx 514xx 515xx
Stainless Steels
Chromium-Manganese-Nickel Steels
Chromium-Nickel Steels Chromium Steels
5xx Chromium Steels a xx in the last two digits of the carbon and low-alloy designations (but not the stainless steels) indicates that the carbon content (in hundredths of a percent) is to be inserted.
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