Table 56.50-105(a)-Charpy V-Notch Energy Multiplying Factors
Charpy V-notch specimen size1 | Factor for minimum energy, average of 3 specimens1 | Factor for minimum energy single specimen1 |
10 * 10 mm | 1 | 2/3 |
10 * 7.5 mm | 5/6 | 5/9 |
10 * 5.0 mm | 2/3 | 4/9 |
10 * 2.5 mm | 1/2 | 1/3 |
1 Straight line interpolation for intermediate values is permitted.
Table 56.50-105-Acceptable Materials and Toughness Test Criteria2
Product form | ASTM specification3 | Grade4 | Minimum service temperature | Minimum avg Charpy V notch energy |
Pipe | 1 | -30 °F | 20 ft. lb. | |
3 | -150 °F | 25 ft. lb. | ||
Tube (carbon and low | A-333 and | 4 (A-333 only) | -100 °F | 25 ft. lb. |
alloy steels). | A-334 | 6 | -30 °F | 20 ft. lb. |
7 | -100 °F | 25 ft. lb. | ||
8 | -320 °F | Refer to § 54.25-20 of this subchapter. | ||
Pipe (Austenitic stainless steel) | A-312 | All Grades | No limit | Austenitic stainless steel piping need be impact tested only when toughness tests are specified in subpart 54.25 of this subchapter for plating of the same alloy designation. When such toughness tests are required, the minimum average energy is 25 ft. lb. |
Wrought welding fittings | WPL1 | -30 °F | 20 ft. lb. | |
(carbon and low alloy | A-420 | WPL3 | -150 °F | 25 ft. lb. |
steels). | WPL4 | -100 °F | 25 ft. lb. | |
Forged or rolled flanges, | LF1 | -30 °F | 20 ft. lb. | |
forged fittings, valves | A-3501 | LF2 | -30 °F | 20 ft. lb. |
and pressure parts | LF3 | -150 °F | 25 ft. lb. | |
(carbon and low alloy | LF4 | -100 °F | 25 ft. lb. | |
steels). | ||||
Forged or rolled flanges, forged fittings, valves and pressure parts (high alloy steels) | A-182 | Austenitic grades only (304, 304H, 304L, 310, 316, 316H, 316L, 321, 321H, 347, 347H, 348, 348H) | No limit | These products need be impact tested only when toughness tests are specified in subpart 54.25 of this subchapter for plating of the same alloy designation. When such toughness tests are required, the minimum average energy is 25 ft. lb. |
Forged flanges, fittings, | A-522 | 9% Ni | -320 °F | Refer to § 54.25-20 of |
and valves (9% nickel). | this subchapter. | |||
Castings for valves and | LCB | -30 °F | 20 ft. lb. | |
pressure parts (carbon | A-3521 | LC1 | -50 °F | 20 ft. lb. |
and low alloy steels). | LC2 | -100 °F | 25 ft. lb. | |
LC3 | -150 °F | 25 ft. lb. | ||
Castings for valves and pressure parts (high alloy steel) | A-351 | Austenitic grades CF3, CF3A, CF8, CF8A, CF3M, CF8M, CF8C, CK20 only | No limit, except -325 °F for grades CF8C and CK20 | No toughness testing required except for service temperatures colder than -425 °F for grades CF3, CF3A, CF8, CF8A, CF3M, and CF8M. 25 ft. lb. |
average must be | ||||
attained in these tests. | ||||
Bolting | A-320 | L7, L9, L10, L43 | -150 °F | 20 ft. lb. |
B8D, B8T, B8F, B8M | -325 °F | No test required. | ||
2B8, B8C | No limit | No test required, except for service temperatures colder than -425 °F. In such case the minimum average energy is 25 ft. lb. | ||
4 | -150 °F | 20 ft. lb. | ||
Nuts, bolting | A-194 | 8T, 8F | -325 °F | No test required. |
8, 8C | No limit | Same requirement as comparable grades (B8, B8C) of bolting listed above. |
1 Quench and temper heat treatment may be permitted when specifically authorized by the Commandant. In those cases the minimum average Charpy V-notch energy shall be specially designated by the Commandant.
2 Other material specifications for product forms acceptable under part 54 for use at low temperatures may also be used for piping systems provided the applicable toughness requirements of this Table are also met.
3 Any repair method must be acceptable to the Commandant CG-ENG, and welding repairs as well as fabrication welding must be in accordance with part 57 of this chapter.
4 The acceptability of several alloys for low temperature service is not intended to suggest acceptable resistance to marine corrosion. The selection of alloys for any particular shipboard location must take corrosion resistance into account and be approved by the Marine Safety Center.
46 C.F.R. §56.50-105
The ASTM standards listed in table 56.50-105 are incorporated by reference; see 46 CFR 56.01-2 .