ASTM B474-03(2009)

1.1 This specification covers electric fusion welded pipe suitable for high-temperature or corrosive service as listed in Table 1. (Although no restrictions are placed on the sizes of pipe that may be furnished under this specification, commercial practice is commonly limited to sizes not less than 8 in. (203 mm) nominal diameter.)

1.2 Five classes of pipe are covered as follows:

1.2.1 Class 1 - Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.

1.2.2 Class 2 - Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.

1.2.3 Class 3 - Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.

1.2.4 Class 4 - Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal.

1.2.5 Class 5 - Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

TABLE 1 Recommended Heat Treatment

Alloy	UNS Designation	PWHTA, B Deg. F. (Deg. C)	Quench
200 (Ni)	N02200	1650-1700 (900 to 928)	Rapid Air/water
201 (Low C)	N02201	1650-1700 (900 to 928)	Rapid Air/water
400 (Ni-Cu)	N04400	1650-1700 (900 to 928)	Rapid Air/water
X (Ni-Cr-Mo-Fe)	N06002	2150 (1177)C	Rapid Air/water
C22D (Low C-Ni-Mo-Cr)	N06022	2050-(1120)C	Rapid Air/water
G30D (Ni-Cr-Fe-Mo-Cu)	N06030	2150 (1177)C	Rapid Air/water
C2000D(Ni-Cr-Mo-Cu)	N06200	2075-2125 (1135-1163)B	Rapid Air/water
230D (Ni-Cr-W-Mo)	N06230	2150-2250 (1177-1232)B	Rapid Air/water
600 (Ni-Cr-Fe)	N06600	1800-1850 (983 to 1010)	Rapid Air/water
601 (Ni-Cr-Fe-Al)	N06601	1600-1650 (874 to 900)E	Rapid Air/water
625 (Ni-Cr-Mo-Cb) Grade 1	N06625	1600 (871)C	Rapid Air/water
625 (Ni-Cr-Mo-Cb) Grade 2	N06625	2000 (1093)C	Rapid Air/water
G3D (Ni-Cr-Fe-Mo-Cu)	N06985	2100-2150 (1147 to 1177)B	Rapid Air/water
Alloy 20 (Cr-Ni-Fe-Mo-Cu-Cb)	N08020	1700-1850 (927 to 1010)	Rapid Air/water
...	N08024	1925-1975 (1052 to 1079)	Rapid Air/water
...	N08026	2050-2200 (1121 to 1204)	Rapid Air/water
825 (Ni-Fe-Cr-Mo-Cu)	N08825	1700-1800 (930 to 980)E	Rapid Air/water
C276 (Low C-Ni-Mo-Cr)	N10276	2050 (1121)C	Rapid Air/water
B2 (Ni-Mo)	N10665	1950 (1065)C	Rapid Air/water
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