Table 1

[Open-hearth, basic oxygen, or electric steel of uniform quality. The following chemical composition limits are based on ladle analysis:]

Open Table
Designation Chemical composition, percent-ladle analysis
Grade 11 Grade 21 2 Grade 32 4 5
Carbon 0.10/0.20 0.24 maximum 0.22 maximum.
Manganese 1.10/1.60 0.50/1.00 1.25 maximum.
Phosphorus, maximum 0.04 0.04 0.045.6
Sulfur, maximum 0.05 0.05 0.05.
Silicon 0.15/0.30 0.30 maximum
Copper, maximum 0.40
Columbium 0.01/0.04
Heat treatment authorized (3) (3) (3).
Maximum stress (p.s.i.) 35,000 35,000 35,000.

1Addition of other elements to obtain alloying effect is not authorized.

2Ferritic grain size 6 or finer according to ASTM E 112-96 (IBR, see §171.7 of this subchapter).

3Any suitable heat treatment in excess of 1,100 °F., except that liquid quenching is not permitted.

4Other alloying elements may be added and shall be reported.

5For compositions with a maximum carbon content of 0.15 percent of ladle analysis, the maximum limit for manganese on ladle analysis may be 1.40 percent.

6Rephosphorized Grade 3 steels containing no more than 0.15 percent phosphorus are permitted if carbon content does not exceed 0.15 percent and manganese does not exceed 1 percent.

Check Analysis Tolerances

[A heat of steel made under any of the above grades, the ladle analysis of which is slightly out of the specified range is acceptable if the check analysis is within the following variations:]

Open Table
Element Limit or maximum specified (percent) Tolerance (percent) over the maximum limit or under the minimum limit
Under minimum limit Over maximum limit
Carbon To 0.15 inclusive 0.02 0.03
    Over 0.15 to 0.40 inclusive 0.03 0.04
Manganese To 0.60 inclusive 0.03 0.03
    Over 0.60 to 1.15 inclusive 0.04 0.04
    Over 1.15 to 2.50 inclusive 0.05 0.05
Phosphorus7 All ranges 0.01
Sulfur All ranges 0.01
Silicon To 0.30 inclusive 0.02 0.03
    Over 0.30 to 1.00 inclusive 0.05 0.05
Copper To 1.00 inclusive 0.03 0.03
    Over 1.00 to 2.00 inclusive 0.05 0.05
Nickel To 1.00 inclusive 0.03 0.03
    Over 1.00 to 2.00 inclusive 0.05 0.05
Chromium To 0.90 inclusive 0.03 0.03
    Over 0.90 to 2.10 inclusive 0.05 0.05
Molybdenum To 0.20 inclusive 0.01 0.01
    Over 0.20 to 0.40 inclusive 0.02 0.02
Zirconium All ranges 0.01 0.05
Columbium To 0.04 inclusive 0.005 0.01
Aluminum Over 0.10 to 0.20 inclusive 0.04 0.04
    Over 0.20 to 0.30 inclusive 0.05 0.05

7Rephosphorized steels not subject to check analysis for phosphorus.

[Amdt. 178-3, 34 FR 12283, July 25, 1969; 34 FR 12593, Aug. 1, 1969, as amended by Amdt. 178-64, 45 FR 81573, Dec. 11, 1980; Amdt. 178-97, 55 FR 52728, Dec. 21, 1990; 68 FR 75758, Dec. 31, 2003]


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