Appendix A to Part 178—Specifications for steel

**Table 1**
Designation	Chemical composition, percent-ladle analysis
Designation	Grade 1¹	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	0.045⁶
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.

**Check analysis tolerances**
Element	Limit or maximum specified (percent)	Tolerance (percent) over the maximum limit or under the minimum limit
Element	Limit or maximum specified (percent)	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]

['General Packaging Requirements - Hazmat']

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Appendix A to Part 178—Specifications for steel