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  FOUR DIGIT ALLOY NUMBERING SYSTEMS

WHAT THOSE NUMBERS MEAN WHEN ORDERING STEEL
NOTE: Alloying elements are in weight percent, XX denotes carbon content.

10XX Basic plain carbon steel
11XX Plain carbon steel with high sulfur & low phosphorous (Resulferized)
12XX Plain carbon steel with high sulfur & high phosphorous
13XX 1.75 manganese
23XX 3.50 nickel (series deleted in 1959)
25XX 5.00 nickel (series deleted in 1959)
31XX 1.25 nickel & 0.60 chromium (series deleted in 1959)
33XX 3.50 nickel & 1.50 chromium (series deleted in 1959)
40XX 0.20 - 0.25 molybdenum
41XX 0.50 - 0.95 chromium & 0.12 - 0.30 molybdenum
43XX 1.83 nickel, 0.50 - 0.80 chromium & 0.25 molybdenum
44XX 0.53 molybdenum
46XX 0.85 or 1.83 nickel & 0.23 molybdenum
47XX 1.05 nickel, 0.45 chromium &0.20 - 0.35 molybdenum
48XX 3.5 nickel & 0.25 molybdenum
50XX 0.40 chromium
51XX 0.80 - 1.00 chromium
61XX 0.60 0r 0.95 chromium & 0.13 - 0.15 vanadium
86XX 0.55 nickel, 0.50 chromium & 0.20 molybdenum
87XX 0.55 nickel, 0.50 chromium & .25 molybdenum
88XX 0.55 nickel, 0.50 chromium & .35 molybdenum
92XX 2.00 silicon
93XX 3.25 nickel, 1.20 chromium & 0.12 molybdenum (series deleted in 1959)
98XX 1.00 nickel, 0.80 chromium & 0.25 molybdenum (series deleted in 1959)

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Last modified: December 08, 2001