SAE (Society of Automotive Engineers) Steels
xx denotes carbon levels in hundredths of a percent.
10xx Carbon; Mn <1.0
11xx Resulfurized
12xx Resulfurized and rephosphorized
13xx Mn 1.75
15xx Mn 1.0–1.65
23xx Ni 3.5
25xx Ni 5.0
31xx Ni 1.25; Cr 0.65, or 0.80
32xx Ni 1.75; Cr 1.07
33xx Ni 3.50; Cr 1.50, or 1.57
34xx Ni 3.00; Cr 0.77
40xx Mo 0.2%, 0.25, or Mo 0.25
41xx Mo 0.4%, or 0.52
43xx Ni 1.82; Cr 0.50–0.80; Mo 0.25
46xx Ni 0.85, or 1.82; Mo 0.20, or 0.25
47xx Ni 1.05; Cr 0.45; Mo 0.20, or 0.35
48xx Ni 3.50; Mo 0.25
50xx Cr 0.27, 0.40, 0.50, or 0.65
51xx Cr 0.80, 0.87, 0.92, 1.00, or 1.05
52xxx Cr 1.45; C 1.0
53xx Cr 1.80; C 1.0
61xx Cr 0.60, 0.80, 0.95; V 0.10, or 0.15.
72xx W 1.75; Cr 0.75
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
92xx Si 1.40, or 2.00; Mn 0.65 or 0.85; Cr 0.65
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 0.2
ANSI (American National Standards Institute) Low Alloy Steels
Low-alloy steels are a category of ferrous materials that exhibit mechanical properties better than plain carbon steels as the result of alloying elements such as Ni, Cr, W, V, and Mo. Alloy contents of the low alloy category can range from about 2% up to 10%.
AISI (American Iron and Steel Institute) Steel codes
A Air hardening alloys
D Die steel alloys
F Tungsten alloys
H Hot work alloys
L Low alloy
M Molybdenum alloys
O Oil hardening alloys
P Mold steel alloys
S Shock resistant steels
W Water hardening steels