5/24/2018 Asme CCase 2010-3

1/3

91

Asme BPVC Code Cases 1998 Edition CCASE12010 06-15-98 13:00:08

CASE

2010-3

CASES OF ASME BOILER AND PRESSURE VESSEL CODE

Approval Date: August 8, 1994

See Numeric Index for expiration

and any reaffirmation dates.

Case 2010-3

Fe-22Cr-21Ni-18.5Co-La Alloy, UNS R30556, forCode Construction

Section I

Inquiry: May solution-annealed alloy UNS R30556

wrought sheet, strip, plate, bar, welded pipe and tube,

and seamless pipe and tube, conforming to the specifica-

tions listed in Table 1, be used in welded construction

under Section I?

Reply: It is the opinion of the Committee that solu-

tion-annealed alloy UNS R30556 wrought sheet, strip,

plate, bar, welded pipe and tube, and seamless pipe

and tube, as described in the Inquiry, may be used in

welded construction complying with the rules of SectionI providing the following additional requirements are

met.

(a) The maximum allowable stress values for the

material shall be those given in Table 2. For welded

pipe and tube products, a joint efficiency factor of 0.85

shall be used.

(b) Separate welding procedure qualifications and

performance qualifications, conducted in accordance

with Section IX, shall be required for this material.

(c) The y values [see PG-27.4, Note (6)] shall be

as follows:

(1) 1150F and below, y p 0.4

(2) 1200F, y p 0.5

(d) This Case number shall be shown on the docu-

mentation and marking of the material and recorded

on the Manufacturers Data Report.

CAUTIONARY NOTE: Austenitic alloys are subject to stress corro-sion cracking, intergranular attack, pitting, and crevice corrosion

when used in boiler applications in aqueous environments. Factorsthat affect the susceptibility of these materials are applied or residualstress, water chemistry and deposition of solids, and material condi-tion. Susceptibility to attack is enhanced when the material is usedin a sensitized condition, or with residual cold work. Concentrationof corrosive agents (e.g., chlorides, caustic, or reduced sulfur species)can occur under deposits formed on the surface of these materials,

and can result in severe underdeposit wastage or cracking. Forsuccessful operation in water environments, careful attention mustbe paid to continuous control of water chemistry.

This is Electrontic File Page # 91

TABLE 1

MATERIAL SPECIFICATIONSSheet, plate, and strip SB-435

Bar SB-572

Seamless pipe and tube SB-622

Welded pipe SB-619

Welded tube SB-626

TABLE 2

MAXIMUM ALLOWABLE STRESS VALUES

For Metal Temperature Allowable Stress Values,Not Exceeding, F max., ksi

100 25.0 25.0

200 25.0 25.0

300 23.1 24.5 [Note (1)]

400 21.3 23.7 [Note (1)]

500 20.1 23.1 [Note (1)]

600 19.3 22.8 [Note (1)]

650 19.0 22.7 [Note (1)]

700 18.7 22.5 [Note (1)]

750 18.5 22.4 [Note (1)]

800 18.2 22.3 [Note (1)]

850 18.0 22.2 [Note (1)]

900 17.8 22.1 [Note (1)]

950 17.6 21.8 [Note (1)]

1000 17.4 21.6 [Note (1)]

1050 17.2 21.4 [Note (1)]

1100 17.1 20.8 [Note (1)]

1150 16.9 16.9

1200 13.4 13.4

NOTE:(1) Due to the relatively low yield strength of these materials, these

higher stress values were established at temperatures where the

short time tensile properties govern to permit the use of thesealloys where slightly greater deformation is acceptable. Thesehigher stress values exceed 6623%, but do not exceed 90% ofthe yield strength at temperature. Use of these stresses may resultin dimensional changes due to permanent strain. These stressvalues are not recommended for the flanges of gasketed joints orother applications where slight amounts of distortion can cause

leakage or malfunction.

5/24/2018 Asme CCase 2010-3

2/3Asme BPVC Code Cases 1998 Edition CCASE12010 06-15-98 13:00:08

This is Electrontic File Page # 92

5/24/2018 Asme CCase 2010-3

3/3