» Products » ASTM A182 Gr. F321 Flanges | ASME B16.5 & B16.47

ASTM A182 Gr. F321 Flanges | ASME B16.5 & B16.47

Welding neck flanges made from ASTM A182 Gr. F321, raised face (RF), 16" 150LB SCH40, supplied to Melbourne city, Australia.

  • Description

Flanges manufactured in accordance with ASME B16.5 or ASME B16.47 may be made from ASTM A182 grade F321 forgings, which has the nominal composition of 18Cr-10Ni-Ti. ASTM A182 Gr. F321 is a titanium-stabilized austenitic stainless steel, in which titanium is added to avert sensitization to intergranular corrosion when the flange has prolonged exposure to the temperature between 425°C to 815°C [800°F to 1500°C]. The precipitation of chromium carbides at such a temperature results in chromium depletion at the very area adjacent to grain boundaries, which is the cause of intergranular corrosion. ASTM A182 Gr. F321 has a titanium content of not less than five times the carbon plus the nitrogen content and not more than 0.70%. Since titanium carbide is more stable, the carbon content prefers to react with titanium to form titanium carbides before combining with chromium. In such a way, depletion of chromium is eliminated. However, since nitrogen has higher affinity with titanium than carbon, titanium shall be furnished in sufficient amount to cover both the carbon and nitrogen.

Chemical Composition Requirements

ElementComposition, %
C≤0.08
Mn≤2.00
P≤0.045
S≤0.030
Si≤1.00
Ni9.0-12.0
Cr17.0-19.0
Ti*J
* Titanium content of ASTM A182 F321: 5×(C+N) ≤ J ≤ 0.70%.

Mechanical Properties & Heat Treatment

Tensile TestRequirements
Tensile Strength
min. MPa [ksi]
515 [75]
Yield Strength
min. MPa [ksi]
205 [30]
Elongation in
2", min. %
30
Reduction of
Area, min. %
50
*ASTM A182 Gr. F321 forged flanges shall be solution treated at a temperature between 1900~1950°F [1040~1065°C], and followed by a quench in water to rapidly cool it down below 500°F [260°C]. Subsequent to the solution anneal for Gr. F321 flanges, a stabilizing treatment at 1500°F to 1600°F [815°C to 870°C] for a minimum of 2 hours per inch of thickness and then cooling in the furnace or in air.

Pressure-Temperature Ratings

The pressure-temperature (P-T) ratings for ASTM A182 Gr. F321 flanges are presented in below tables, indicating maximum allowable working gauge pressures in psi units at the temperatures in degrees Fahrenheit. ASTM A182 F321 flanges made in accordance with ASME B16.5 are available in Class 150, 300, 400, 600, 900, 1500, and 2500. They are available in Class 150, 300, 400, 600, 900, and in Class 75, 150, 300, 400, 600, 900 for Series A and Series B flanges of ASME B16.47, respectively.

Temp.
°F
75#
psi
150#
psi
300#
psi
-20~100140275720
200125250650
300115230595
400110200550
50085170515
60070140485
65060125475
700-110465
750-95460
800-80450
850-65445
900-50440
950-35385
1000-20365
1050--360
1100--310
1150--235
1200--185
1250--140
1300--110
1350--85
1400--65
1450--50
1500--40
*P-T ratings for Gr. F321 of Group 2.4, for Class 75, 150, 300.

Temp.°F400#600#900#
-20~10096014402160
20086512951945
30079511901785
40073511051655
50069010301550
6006509751460
6506359501425
7006209301395
7506109151375
8006009001355
8505958951340
9005908851325
9505157751160
10004857251090
10504807201080
1100415625935
1150315475710
1200245370555
1250185280420
1300145220330
1350115170255
140085130195
145070105155
15005075115
*P-T ratings for Gr. F321 of Group 2.4, for Class 400, 600, 900.

Temp.°F1500#2500#
-20~10036006000
20032405400
30029754960
40027604600
50025804300
60024354060
65023753960
70023303880
75022903820
80022553760
85022303720
90022103680
95019303220
100018203030
105018003000
110015602600
115011851970
12009251545
12507051170
1300550915
1350430715
1400325545
1450255430
1500190315
*P-T ratings for Gr. F321 of Group 2.4, for Class 1500 and 2500.

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