ASTM A182 F53 UNS S32750 Blind Flange RF Size 24IN CL150

ASTM A182 F53 flanges

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.

BLIND RF FLANGE, SIZE 24IN CL150 Side Marking

One of the main benefits of using ASTM A182 F53 Duplex2507 S32750 Flange is its resistance to corrosion. This is especially important in the oil and gas industry, where the flanges are exposed to harsh and corrosive elements. The F53 Duplex2507 S32750 Flange is able to resist the corrosive effects of chemicals, acids, and saltwater, which means that it is able to last longer and require less maintenance than other flange materials.

Another benefit of the ASTM A182 F53 Duplex2507 S32750 Flange is its strength. The material has a high yield strength, which means that it is capable of carrying heavy loads without distorting or breaking. This makes it an ideal choice for use in applications where weight-bearing capacity is crucial.

Astm A182 Standard Specification Download pdf file

What is a Blind Flange?

The blind flange is a solid plate used to seal the pipe or form a stop. It is processed in the same way as a conventional flange, with mounting holes around it, and the gasket sealing ring is processed on the matching surface. The difference is that the blind flange has no opening to allow fluid to pass through. The blind flange can be inserted between two open flanges to prevent the flow of liquid through the pipe.

A blind flange is a solid flange as shown below. The purpose of these is to block off a section o
pipe or a nozzle on a vessel that is not used. (A nozzle is typically a pipe coming out of a vessel and
is usually flanged so it can be connected to valves or piping). Many times a nozzle will be blanked
off with a blind flange for pressure tests in a plant, or simply because the customer does not need
all the nozzles that were supplied on the tank.

If there is no blind flange, it is difficult to maintain or repair the pipe. The flow needs to be shut off at the nearest valve, which may be miles from the service area. Valves are also very expensive and easily stuck. Blind flanges are a more cost-effective way to seal pipes.

ASTM A182 F53 flanges Chemical Composition, %

Cr	Ni	Mo	C	N	Mn
24.0-26.0	6.0-8.0	3.0-5.0	0.030 Max	0.24-0.32	1.20 Max
Si	Cu	P	S	Fe
0.80 Max	0.50 Max	0.035 Max	0.020 Max	Balance

*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.

150# Blind Flange Size

Nominal pipe size	“A” （outer diameter）	“B” （thickness）	“C” （Radio-frequency diameter）	“D” （BCD）	#bolt hole	Diameter/Bolt hole number	Approximate weight
1/2″	3-1/2	7/16	1-3/8	2-3/8	4	5/8	2
3/4″	3-7/8	1/2	1-11/16	2-3/4	4	5/8	2
1″	4-1/4	9/16	2	3-1/8	4	5/8	2
1-1/4″	4-5/8	5/8	2-1/2	3-1/2	4	5/8	3
1-1/2″	5	11/16	2-7/8	3-7/8	4	5/8	3
2	6	3/4	3-5/8	4-3/4	4	3/4	4
2-1/2″	7	7/8	4-1/8	5-1/2	4	3/4	7
3	7-1/2	15/16	5	6	4	3/4	9
3-1/2″	8-1/2	15/16	5-1/2	7	8	3/4	13
4	9	15/16	6-3/16	7-1/2	8	3/4	17
5	10	15/16	7-5/16	8-1/2	8	7/8	20
6″	11	1	8-1/2	9-1/2	8	7/8	27
8	13-1/2	1-1/8	10-5/8	11-3/4	8	7/8	47
10″	16	1-3/16	12-3/4	14-1/4	12	1	67
12	19	1-1/4	15	17 号	12	1	123
14	21	1-3/8	16-1/4	18-3/4	12	1-1/8	139
16	23-1/2	1-7/16	18-1/2	21-1/4	16	1-1/8	187
18	25	1-9/16	21	22-3/4	16	1-1/4	217
20	27-1/2	1-11/16	23	25	20	1-1/4
24	32	1-7/8	27-1/4	29-1/2	20	1-3/8
1/16″ The convex face is included in the thickness of the flange.

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	S_u, 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	S_y
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].