Реферат

This specification covers electric fusion welded pipe suitable for high-temperature or corrosive service. The pipes are designated into five classes namely Class 1, Class 2, Class 3, Class 4 and Class 5, according to how they are to be welded. The joints shall be full penetration double-welded or single-welded butt joints employing fusion welding processes. The furnished pipe shall undergo heat treatment and a chemical analysis shall be employed for both plate and weld. Each pipe shall be subjected to transverse tension test, transverse guided weld bend test and hydrostatic pressure test.

Область применения

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

AlloyUNS DesignationPWHT^{A, B}
Deg. F. (Deg. C)
Quench 200 (Ni)N022001650-1700 (900 to 928)Rapid Air/water 201 (Low C)N022011650-1700 (900 to 928)Rapid Air/water 400 (Ni-Cu)N044001650-1700 (900 to 928)Rapid Air/water X (Ni-Cr-Mo-Fe)N060022150 (1177)^CRapid Air/water C22^D (Low C-Ni-Mo-Cr)N060222050-(1120)^CRapid Air/water G30^D (Ni-Cr-Fe-Mo-Cu)N060302150 (1177)^CRapid Air/water C2000^D(Ni-Cr-Mo-Cu)N062002075-2125 (1135-1163)^BRapid Air/water 230^D (Ni-Cr-W-Mo)N062302150-2250 (1177-1232)^BRapid Air/water 600 (Ni-Cr-Fe)N066001800-1850 (983 to 1010)Rapid Air/water 601 (Ni-Cr-Fe-Al)N066011600-1650 (874 to 900)^ERapid Air/water 625 (Ni-Cr-Mo-Cb) Grade 1N066251600 (871)^CRapid Air/water 625 (Ni-Cr-Mo-Cb) Grade 2N066252000 (1093)^CRapid Air/water G3^D (Ni-Cr-Fe-Mo-Cu)N069852100-2150 (1147 to 1177)^BRapid Air/water Alloy 20 (Cr-Ni-Fe-Mo-Cu-Cb)N080201700-1850 (927 to 1010)Rapid Air/water ...N080241925-1975 (1052 to 1079)Rapid Air/water ...N080262050-2200 (1121 to 1204)Rapid Air/water 825 (Ni-Fe-Cr-Mo-Cu)N088251700-1800 (930 to 980)^ERapid Air/water C276 (Low C-Ni-Mo-Cr)N102762050 (1121)^CRapid Air/water B2 (Ni-Mo)N106651950 (1065)^CRapid Air/water B3^D (Ni-Mo)N106751950 (1065)^CRapid Air/water

^A Recommended temperatures—Different temperatures may be selected by either the purchaser or the manufacturer.

^B Set temperatures, ±25°F (±14°C).

^C Minimum set temperature.

^D Registered Trademark of Haynes International.

^E Heat treatment is highly dependent on intended service temperature — consult material manufacturer for specific heat treatments for end use temperature.