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Asme BPVC Code Cases 1998 Edition CCASE12038 06-15-98 13:09:00

CASE

2038-4

CASES OF ASME BOILER AND PRESSURE VESSEL CODE

Approval Date: August 12, 1996

See Numeric Index for expiration

and any reaffirmation dates.

Case 2038-4

25Cr-22Ni-2Mo-N, UNS S31050, AusteniticStainless Steel Forgings

Section VIII, Divisions 1 and 2

Inquiry: May solution-annealed austenitic stainless

steel, 25Cr-22Ni-2Mo-N, UNS S31050 forgings meeting

the chemical and mechanical property requirements

given in Table 1 and Table 2, and otherwise conforming

to the requirements of Specification SA-182, as applica-

ble, be used in welded construction under the rules of

Section VIII, Divisions 1 and 2?

Reply: It is the opinion of the Committee that the

material listed in the Inquiry may be used in welded

construction under the rules of Section VIII, Divisions

1 and 2, provided the following additional requirements

are met.

TABLE 1

CHEMICAL REQUIREMENTS

(HEAT ANALYSIS)

Element Weight, %

Carbon, max. 0.025

Manganese, max. 2.00

Phosphorus, max. 0.020

Sulfur, max. 0.015

Silicon, max. 0.4Nickel 20.523.5

Chromium 24.026.0

Molybdenum 1.62.6

Nitrogen 0.090.15

TABLE 2

MECHANICAL PROPERTY

REQUIREMENTS

Property ksi

Tensile strength, min. 78

Yield strength, 0.2% offset, min. 37

Elongation in 2 in., min., % 25

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(a) The forgings shall be solution annealed at a

minimum temperature of 1925F and liquid quenchedto a temperature below 500F.

(b) The rules for austenitic stainless steels in Section

VIII, Divisions 1 and 2, as applicable, shall apply.

(c) The maximum allowable design stress values for

Division 1 shall be those listed in Table 3. The maximum

design stress intensity values, and strength values, for

Division 2 shall be those listed in Table 4.

(d) For external pressure design, use Fig. HA-2 of

Section II, Part D for both Divisions 1 and 2.

(e) This material is classified as P-No. 8 Group 2.

(f) This Case number shall be referenced in the

documentation of the material and recorded on the

Manufacturers Data Report.

TABLE 3

MAXIMUM ALLOWABLE STRESS VALUES,

DIVISION 1

For Metal

Temperature

Not Exceeding,

F Allowable Stress Values, ksi

100 19.5 19.5 [Note (1)]

200 19.5 19.5 [Note (1)]

300 17.7 18.5 [Note (1)]

400 16.1 17.6 [Note (1)]

500 14.8 16.9 [Note (1)]

600 13.5 16.4 [Note (1)]

NOTE:(1) See Note G7 of Table 1A in Section II, Part D.

TABLE 4

DESIGN STRESS INTENSITY AND YIELD STRENGTH

VALUES, DIVISION 2

Fo r Me tal Desi gn Str es s

Temperature Intensity Values

Not Exceeding, Sm, ksi Yield Strength

F Forgings Values Sy , ksi

100 24.7 37.0

200 24.7 30.1

300 23.9 26.6

400 21.7 24.2

500 20.0 22.2

600 18.2 20.2

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