|
||||||
|---|---|---|---|---|---|---|
| Home | 29 CFR: 1910 or 1926 | 40 CFR | 49 CFR | Federal Register | MSDS Search | Purchase CFR e-Books |
Table 1
[Open-hearth, basic oxygen, or electric steel of uniform quality. The following chemical composition limits are
based on ladle analysis:]
----------------------------------------------------------------------------------------------------------------
Chemical composition, percent-ladle analysis
Designation --------------------------------------------------------------------------
Grade 1\1\ Grade 2\1\\2\ Grade 3\2\\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.
----------------------------------------------------------------------------------------------------------------
\1\Addition of other elements to obtain alloying effect is not authorized.
\2\Ferritic grain size 6 or finer according to ASTM E112-63.
\3\Any suitable heat treatment in excess of 1,100 deg.F., except that liquid quenching is not permitted.
\4\Other alloying elements may be added and shall be reported.
\5\For 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.
\6\Rephosphorized 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:]
----------------------------------------------------------------------------------------------------------------
Tolerance (percent)
over the maximum limit
or under the minimum
limit
Element Limit or maximum specified (percent) ------------------------
Under Over
minimum maximum
limit 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
Phosphorus\7\.................................. 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
----------------------------------------------------------------------------------------------------------------
\7\Rephosphorized 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]