Be Part of the Ultimate Safety & Compliance Community
Trending news, knowledge-building content, and more – all personalized to you!
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 | 0.0456 |
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 on 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. |
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]