SAE Steel Grades - Carbon and Alloy Steel

Carbon and Alloy Steel

Carbon steels and alloy steels are designated by a four digit number, where the first digit indicates the main alloying element(s), the second digit indicates the secondary alloying element(s), and the last two digits indicate the amount of carbon, in hundredths of a percent (basis points) by weight. For example, a 1060 steel is a plain-carbon steel containing 0.60 wt% C.

An "H" suffix can be added to any designation to denote hardenability is a major requirement. The chemical requirements are loosened but hardness values defined for various distances on a Jominy test.

Major classifications of steel
SAE designation Type
1xxx Carbon steels
2xxx Nickel steels
3xxx Nickel-chromium steels
4xxx Molybdenum steels
5xxx Chromium steels
6xxx Chromium-vanadium steels
7xxx Tungsten steels
8xxx Nickel-chromium-molybdenum steels
9xxx Silicon-manganese steels
Carbon and alloy steel grades
SAE designation Type
Carbon steels
10xx Plain carbon (Mn 1.00% max)
11xx Resulfurized
12xx Resulfurized and rephosphorized
15xx Plain carbon (Mn 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% or 0.80%
32xx Ni 1.25%, Cr 1.07%
33xx Ni 3.50%, Cr 1.50% or 1.57%
34xx Ni 3.00%, Cr 0.77%
Molybdenum steels
40xx Mo 0.20% or 0.25% or 0.25% Mo & 0.042 S
44xx Mo 0.40% or 0.52%
Chromium-molybdenum (Chromoly) steels
41xx Cr 0.50% or 0.80% or 0.95%, Mo 0.12% or 0.20% or 0.25% or 0.30%
Nickel-chromium-molybdenum steels
43xx Ni 1.82%, Cr 0.50% to 0.80%, Mo 0.25%
43BVxx Ni 1.82%, Cr 0.50%, Mo 0.12% or 0.35%, V 0.03% min
47xx Ni 1.05%, Cr 0.45%, Mo 0.20% or 0.35%
81xx Ni 0.30%, Cr 0.40%, Mo 0.12%
81Bxx Ni 0.30%, Cr 0.45%, 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 Ni 0.85% or 1.82%, Mo 0.20% or 0.25%
48xx Ni 3.50%, Mo 0.25%
Chromium steels
50xx Cr 0.27% or 0.40% or 0.50% or 0.65%
50xxx Cr 0.50%, C 1.00% min
50Bxx Cr 0.28% or 0.50%
51xx Cr 0.80% or 0.87% or 0.92% or 1.00% or 1.05%
51xxx Cr 1.02%, C 1.00% min
51Bxx Cr 0.80%
52xxx Cr 1.45%, C 1.00% min
Chromium-vanadium steels
61xx Cr 0.60% or 0.80% or 0.95%, V 0.10% or 0.15% min
Tungsten-chromium steels
72xx W 1.75%, Cr 0.75%
Silicon-manganese steels
92xx Si 1.40% or 2.00%, Mn 0.65% or 0.82% or 0.85%, Cr 0.00% or 0.65%
High-strength low-alloy steels
9xx Various SAE grades
xxBxx Boron steels
xxLxx Leaded steels

Read more about this topic:  SAE Steel Grades

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