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ASTM A182 F5 Flanges

Welding neck flanges with RF, ASME B16.5 Class 300 4" SCH40, ASTM A182 Gr. F5, for the construction of petroleum cracking piping in Jakarta, Indonesia.

  • Description

ASTM A182 F5 flanges shall be manufactured by a forging process furnished in Class 75, 150, 300, 400, 600, 900, 1500, 2500 in accordance with ASME B16.5 and ASME B16.47 (Series A & Series B). Grade F5 of ASTM A182 is a typical Cr-Mo heat resistant alloy steel with nominal chemical composition of 5Cr-0.5Mo and UNS number of K41545.

Applications & Heat Treatments

The ASTM A182 F5 steel has good resistance to corrosion and erosion. Flanges made from ASTM A182 F5 can be used at the temperature up to 1200°F [650°C]. They are widely used in petroleum cracking process, fertilizer production piping, coking unit, as well as power plant steam piping. The flanges can be furnished in annealing or normalizing + tempering conditions. If annealing is applied, the forged flanges shall be annealed at a temperature no less than 1750°F [955°C] for at least 60 minutes and cooled in furnace. If normalizing + tempering are applied, the forged flanges shall be soaked at a temperature no less than 1750°F [955°C] for 2 hours and air cooled. Subsequent tempering temperature shall be no less than 1250°F [675°C].

Chemical Composition Requirements

ElementComposition, %
C≤0.15
Mn0.30-0.60
P≤0.030
S≤0.030
Si≤0.50
Ni≤0.50
Cr4.0-6.0
Mo0.44-0.65
*All values shall be based on heat analysis.

Mechanical Properties

Tensile & HardnessRequirements
Tensile Strength
min. ksi [MPa]
70 [485]
Yield Strength
min. ksi [MPa]
40 [275]
Elongation in
2" min. %
20
Reduction of
Area, min. %
35
Brinell Hardness
HBW
143-217
*Grain size may be tested upon purchaser’s request.

Pressure-Temperature Ratings

Both ASME B16.5 and ASME B16.47 has stipulated pressure-temperature ratings for ASTM A182 F5 steel, which are maximum allowable working gauge pressures in psi units at the temperature in degrees Fahrenheit. The data sheet is divided by Classes: ASME B16.5 flanges are available in Class 150, 300, 400, 600, 900, 1500, 2500; ASME B16.47 Series A are available in Classes 150, 300, 400, 600, 900; and ASME B16.47 Series B are available in Classes 75, 150, 300, 400, 600, 900.

Temp.
°F
Class 75
psi
Class 150
psi
Class 300
psi
-20~100145290750
200135260735
300115230700
400100200670
50085170645
60070140605
65060125590
700-110570
750-95530
800-80510
850-65485
900-50375
950-35275
1000-20200
1050--145
1100--95
1150--60
1200--35
*Working pressures (psi) by Classes 75, 150, 300 at temperatures (°F).

Temp.
°F
Class 400
psi
Class 600
psi
Class 900
psi
-20~100100015002250
20098014702210
30093514002100
40089013352005
50086012901940
60080512101815
65078511751765
70075511351705
75071010651595
80067510151525
8506509751460
9005007451120
950365550825
1000265400595
1050190290430
1100130190290
115080125185
12004570105
*Working pressures (psi) by Classes 400, 600, 900 at temperatures (°F).

Temp.
°F
Class 1500
psi
Class 2500
psi
-20~10037506250
20036806135
30034955830
40033455570
50032305385
60030255040
65029404905
70028404730
75026604430
80025404230
85024354060
90018703115
95013702285
10009951655
10507201200
1100480800
1150310515
1200170285
*Working pressures (psi) by Classes 1500, 2500 at temperatures (°F).

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