ASTM A182 F53 Flanges | UNS S32750 (Alloy 2507)

ASTM A182 F53 flanges refer to flanges made from super duplex stainless steel 2507 (UNS S32750) by a hot forging process. It is listed in Material Group 2.8 according to ASME B16.5 and ASME B16.47. The pressure-temperature ratings for ASTM A182 F53 flanges are the same as that for other duplex stainless steels. The flanges shall not be used at temperatures over 600°F [315°C] since it may be subject to embrittlement after service at moderately elevated temperatures. ASTM A182 F53 flanges shall be solution annealed after forging at a temperature no less than 1880°F [1025°C], followed by water quenching.

Chemical Composition Requirements

Element	Composition, %
C	≤0.030
Mn	≤1.20
P	≤0.035
S	≤0.020
Si	≤0.80
Ni	6.0-8.0
Cr	24.0-26.0
Mo	3.0-5.0
N	0.24–0.32
Cu	≤0.50

*Nominal composition of ASTM A182 Gr. F53 is 25Cr–7Ni–4Mo–N with P-No. 10H.

Mechanical Properties at Room Temperature

Item	T≤2“	T＞2”
Tensile Strength min. MPa [ksi]	785 [114]	730 [106]
Yield Strength min. MPa [ksi]	525 [76]	515 [75]
Elongation in 2", min. %	30	15
Hardness max. HBW	310	310

*In terms of maximum flange thickness T, the tensile and hardness testing requirements are different for ASTM A182 F53.

ASME BPVC: Temperature Limits, Allowable Stresses, Tensile & Yield Strengths

Since ASTM A182 Gr. F53 is a listed material in Table UHA-23, it can be used for the construction of pressure vessels made in accordance with ASME BPVC Section VIII Division 1 – 2019. The minimum design metal temperature (MDMT) without impact testing requirements for ASTM A182 F53 flanges or forgings is -20°F [-30°C]. The maximum design metal temperature is 600°F [315°F].

Temp. °F	S, ksi
100	33.1
200	33.0
300	31.2
400	30.1
500	29.6
600	29.4

*Maximum allowable stresses S of ASTM A182/ ASME SA-182 Gr. F53, for metal temperature, not exceeding.

Temp. °F	Su, ksi
100	116.0
200	115.5
300	109.1
400	105.4
500	103.6
600	103.0

*Tensile strengths S_u of ASTM A182/ASME SA-182 Gr. F52 for metal temperatures, not exceeding, for design calculation only.

Temp. °F	Sy
100	80.0
150	74.0
200	70.5
250	67.4
300	64.7
400	60.7
500	58.3
600	57.0
650	57.0
700	57.0
750	57.0

*Yield strengths S_y of ASTM A182/ASME SA-182 Gr. F52 for metal temperatures, not exceeding, for design calculation only.

Application in ASME B31.1 & B31.3

ASTM A182 F53 (UNS S32750) flanges can be used for power piping in accordance with ASME B31.1 and process piping in accordance with ASME B31.3. According to ASME B31.1, ASTM A182 F53 is designated with T-number Group of “SS -60”, which has the low-temperature service limit of -20°F [-29°C], while ASME B31.3 has indicated the minimum service temperature as -60°F [-51°C]. Both Codes have limited the maximum design temperature to 600°F [315°C]. Especially, ASME B31.3 has mentioned that cold work such as that introduced during certain manufacturing and assembly processes can make UNS S32750 more susceptible to embrittlement when exposed to moderately elevated temperatures, thus, the maximum design temperature in power piping shall be limited to 480°F [250°C].

Temp. °F	S
100	33.1
200	33.0
300	31.2
400	30.1
500	29.6
600	29.4

*Maximum allowable stress in tension, S, for ASTM A182 F53 for metal temperature, not exceeding; abstracted from Table A-3 of ASME B31.1 – 2018.

Temp. °F	S
Min. to 100	38.7
200	38.5
300	36.4
400	35.1
500	34.5
600	34.3

*Basic allowable stress in tension, S, for ASTM A182 F53 at metal temperature, not exceeding; abstracted from Table A-1 of ASME B31.3 – 2018.

Test & Inspection

Tensile test, PMI test, visual inspection, dimensional examination, hardness test, corrosion test, detrimental intermetallic phase detection.