Home > Carbon Alloy Steel Tube & Pipe > Designation of Carbon & Alloy Steels

Designation of Carbon & Alloy Steels

AISI/SAE Carbon Steels

Grade	Description
10XX	Nonresulphurized Carbon Steels, Manganese 1.00% maximum
11XX	Resulphurized Carbon Steels
12XX	Rephosphorized and Resulphurized Carbon Steels
15XX	Nonresulphurized Carbon Steels, Manganese max. over 1.00%

First two digits indicate grade of carbon steel.
Last two digits represent middle of carbon range.

AISI/SAE Alloy Steels

Grade	Principle Alloying Elements-Percent
13XX	Manganese 1.75
23XX	Nickel 3.50
25XX	Nickel 5.00
31XX	Nickel 1.25; Chromium 0.65
E33XX	Nickel 3.50; Chromium 1.55; Electric Furnace
40XX	Molybdenum 0.25
41XX	Chromium 0.50 or .95; Molybdenum 0.12 or 0.20
43XX	Nickel 1.80; Chromium 0.50 or 0.80; Molybdenum 0.25
E43XX	Same as above, produced in Basic Electric Furnace
44XX	Manganese 0.80; Molybdenum 0.40
45XX	Manganese 0.55; Molybdenum 0.50
46XX	Nickel 1.85; Molybdenum 0.20 or 0.35
47XX	Nickel 1.05; Chromium 0.45; Molybdenum 0.20 or 0.35
50XX	Chromium 0.28 or 0.40
51XX	Chromium 0.80, 0.88, 0.93, or 1.00
E5XXXX	High Carbon; High Chromium, Electric Furnace Bearing Steel
E50100	Carbon 1.00; Chromium .50
E51100	Carbon 1.00; Chromium 1.0
E52100	Carbon 1.00; Chromium 1.45
61XX	Chromium 0.60, 0.80, or 0.95; Vanadium 0.12, or 0.10 Min. or 0.15 Min.
7140	Carbon 0.40; Chromium 1.60; Molybdenum 0.35; Aluminum 1.15
81XX	Nickel 0.30; Chromium 0.40; Molybdenum 0.12
86XX	Nickel 0.55; Chromium 0.50; Molybdenum 0.20
87XX	Nickel 0.55; Chromium 0.50; Molybdenum 0.25
88XX	Nickel 055; Chromium 0.50; Molybdenum 0.35
92XX	Manganese 0.85; Silicon 2.00; (9262-Chromium 0.25 to 0.40)
93XX	Nickel 3.25; Chromium 1.20; Molybdenum 0.12
98XX	Nickel 1.00; Chromium 0.80; Molybdenum 0.25
14BXX	Boron
50BXX	Chromium 0.50 or 0.18; Boron
51BXX	Chromium 0.80; Boron
81BXX	Nickel 0.33; Chromium 0.45; Molybdenum 0.12; Boron
86BXX	Nickel 0.56; Chromium 0.50; Molybdenum 0.20; Boron
94BXX	Nickel 0.45; Chromium 0.40; Molybdenum 0.12; Boron

First two digits indicate grade of alloy steel.
Last two digits represent middle of carbon range.
If carbon over 1.00%, a third digit is added.

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illuatration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.