CASE

2304-2CASES OF ASME BOILER AND PRESSURE VESSEL CODE

Approval Date: May 12, 2004

The ASME Boiler and Pressure Vessel Standards Committee took action toeliminate Code Case expiration dates effective March 11, 2005. This means thatall Code Cases listed in this Supplement and beyond will remain available for

use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.

Case 2304-2Austenitic Fe-35Ni-27Cr Alloy (UNS S35045)Section I and Section VIII, Division 1

Inquiry: May annealed austenitic Fe-35Ni-27Cr alloy(UNS S35045) wrought sheet, strip, plate, rod, bar, seam-less and welded pipe and tube, fittings, and forgings, withthe chemical analysis shown in Table 1 and minimummechanical properties shown in Table 2 and otherwiseconforming to one of the specifications given in Table 3,be used in welded construction under the rules of Section Iand Section VIII, Division 1?

Reply: It is the opinion of the Committee that materialdescribed in the inquiry may be used in Section I andSection VIII, Division 1 construction at a design tempera-ture of 1,650°F (900°C) or less, provided the followingadditional requirements are met:

(a) The rules in Section VIII, Division 1 that shall applyare those given in Part UNF for nickel alloys.

(b) For Section I design the y values (see PG-27.4 notes)used for PG-27.2.2 shall be as follows:

≤1150°F (620°C) y p 0.41200°F (650°C) y p 0.5≥1250°F (675°C) y p 0.7

(c) The maximum allowable stress values for the mate-rial shall be those given in Tables 4 (U.S. CustomaryUnits) and 4M (SI Metric Units). The maximum designtemperature shall be 1,650°F (900°C). For welded pipeand tube products, a joint efficiency factor of 0.85 shallbe used.

(d) Separate welding procedures and performance quali-fications shall be conducted for the material in accordancewith Section IX.

(e) Heat treatment after forming or fabrication is neitherrequired nor prohibited.

(f) For external pressure values, use Fig. NFN-9 ofSection II, Part D.

(g) This Case number shall be shown on the materialcertification, on the material, and on the Manufacturer’sData Report.

The Committee’s function is to establish rules of safety, relating only to pressure integrity, governing the construction of boilers, pressure vessels, transport tanks andnuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to interpret these rules when questions ariseregarding their intent. This Code does not address other safety issues relating to the construction of boilers, pressure vessels, transport tanks and nuclear components,and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, laws, regulations orother relevant documents.

1 (2304-2)

TABLE 1CHEMICAL REQUIREMENTS

CompositionElement Limits, %

Nickel 32.0–37.0Chromium 25.0–29.0Iron [Note (1)] BalanceManganese, max. 1.5Carbon 0.06–0.10Silicon, max. 1.0Sulfur, max. 0.015Aluminum 0.15–0.60Titanium 0.15–0.60Copper, max. 0.75

NOTE:(1) This element shall be determined arithmetically by difference.

TABLE 2MECHANICAL PROPERTY REQUIREMENTS

(Room Temperature)

Tensile strength, min. (ksi) 70Yield strength, 0.2%, offset min. (ksi) 25Elongation in 2 in., gage or 4D min. (%) 35

TABLE 3PRODUCT SPECIFICATIONS

Fittings SA-403Forgings SA-182Plate, sheet, and strip SA-240Rod and bar SA-479Seamless and welded pipe SA-312Seamless tubing SA-213Welded tubing SA-249

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CASE (continued)

2304-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODE

TABLE 4MAXIMUM ALLOWABLE STRESS VALUES, U.S.

CUSTOMARY UNITS [Note (1)]

For Metal Temperature AllowableNot Exceeding, °F Stress Values, Max., ksi

−20–100 16.7 16.7 . . .200 14.6 16.7 [Note (2)]300 13.6 16.7 [Note (2)]400 12.3 16.7 [Note (2)]500 12.1 16.4 [Note (2)]600 11.7 15.8 [Note (2)]650 11.5 15.5 [Note (2)]700 11.3 15.3 [Note (2)]750 11.2 15.1 [Note (2)]800 11.1 15.1 [Note (2)]850 11.0 14.9 [Note (2)]900 10.9 14.7 [Note (2)]950 10.8 14.6 [Note (2)]

1,000 10.7 14.5 [Note (2)]1,050 10.6 13.7 [Note (2)]1,100 10.5 10.9 [Note (2)]1,150 8.8 8.8 . . .1,200 7.1 7.1 . . .1,250 5.8 5.8 . . .1,300 4.7 4.7 . . .1,350 3.8 3.8 . . .1,400 3.1 3.1 . . .1,450 2.5 2.5 . . .1,500 2.0 2.0 . . .1,550 1.5 1.5 . . .1,600 1.2 1.2 . . .1,650 0.90 0.90 . . .

NOTES:(1) The revised criterion of 3.5 on tensile strength was used in

establishing these values.(2) Due to the relatively low yield strength of this material, these higher

stress values were established at temperatures where the short-timetensile properties govern to permit the use of these alloys whereslightly greater deformation is acceptable. These higher stressvalues exceed 662⁄3% but do not exceed 90% of the yield strengthat temperature. Use of these stresses may result in dimensionalchanges due to permanent strain. These stress values are notrecommended for the flanges of gasketed joints or other applicationswhere slight amounts of distortion can cause leakage ormalfunction.

2 (2304-2)

TABLE 4MMAXIMUM ALLOWABLE STRESS VALUES, SI METRIC

UNITS [Note (1)]

For Metal Temperature AllowableNot Exceeding, °C Stress Values, Max., MPa

−30–40 115 115 . . .65 115 101.2 [Note (2)]

100 115 99.6 [Note (2)]150 115 93.1 [Note (2)]200 115 88.0 [Note (2)]250 114 84.1 [Note (2)]300 109 81.1 [Note (2)]325 108 79.9 [Note (2)]350 106 78.8 [Note (2)]375 105 77.9 [Note (2)]400 104 77.1 [Note (2)]425 103 76.4 [Note (2)]450 102 75.2 [Note (2)]475 102 75.2 [Note (2)]500 101 74.6 [Note (2)]525 100 74.0 [Note (2)]550 99.1 73.4 . . .575 87.4 72.7 . . .600 71.8 71.8 . . .625 58.9 58.9 . . .650 48.5 48.5 . . .675 40.1 40.1 . . .700 33.3 33.3 . . .725 27.8 27.8 . . .750 23.2 23.2 . . .775 19.2 19.2 . . .800 15.7 15.7 . . .825 12.6 12.6 . . .850 9.8 9.8 . . .875 7.6 7.6 . . .900 6.4 6.4 . . .

NOTES:(1) The revised criterion of 3.5 on tensile strength was used in

establishing these values.(2) Due to the relatively low yield strength of this material, these higher

stress values were established at temperatures where the short-timetensile properties govern to permit the use of these alloys whereslightly greater deformation is acceptable. These higher stressvalues exceed 662⁄3% but do not exceed 90% of the yield strengthat temperature. Use of these stresses may result in dimensionalchanges due to permanent strain. These stress values are notrecommended for the flanges of gasketed joints or other applicationswhere slight amounts of distortion can cause leakage ormalfunction.

Copyright ASME International Provided by IHS under license with ASME Licensee=Technip/5931917100, User=LAURENT, POMIE

Not for Resale, 12/09/2008 02:46:39 MSTNo reproduction or networking permitted without license from IHS

--``,,,`,,`,`,,``,``,,`,,,,,``,,-`-`,,`,,`,`,,`---