» Products » ASTM A182 F11 Flanges | ASME B16.5 | ASME B16.47

ASTM A182 F11 Flanges | ASME B16.5 | ASME B16.47

Welding neck flanges 12" SCH80 RTJ, ASME B16.5 Class 600, made of ASTM A182 Grade F11 Class 2, supplied to a chemical plant in Thailand.

  • Description

The ASME B16.5 and ASME B16.47 flanges can be made from ASTM A182 Gr.F11 Class 2 steels by a forging process. They may be furnished in various flange types covering welding neck, slip on, and blind, etc. Both ASME B16.5 and ASME B16.47 have endorsed the use of ASTM A182 Gr. F11 Class 2 in Material Group 1.9, which has the nominal chemical composition of 1.25Cr-0.5Mo-Si. Flanges made from this steel are generally used with maximum working temperature limit of 590°C [1100°F]. It is permissible but not recommended for prolonged use above 590°C [1100°F].

Chemical Composition Requirements

ElementComposition, %
C0.10-0.20
Mn0.30-0.80
P≤0.040
S≤0.040
Si0.50-1.00
Cr1.00-1.50
Mo0.44-0.65
*The UNS number of ASTM A182 Gr. F11 Cl. 2 is K11572.

Mechanical Properties

Tensile Strength
min. ksi [MPa]
70 [485]
Yield Strength
min. ksi [MPa]
40 [275]
Elongation in
2", min. %
20
Reduction of
Area, min. %
30
Brinell Hardness
HBW
143-207
*Tensile and hardness requirements.

Manufacture & Heat Treatment

The starting material of the ASTM A182 Gr. F11 Cl. 2 flange shall be low-alloy ferritic steels made by the open-hearth, electric-furnace, or basic-oxygen process with the option of separate degassing and refining processes in each case. The material shall be forged as close as practicable to the specified flange shape and size. After hot forging, the flange sahll be cooled to a temperature below 538°C [1000°F] prior to heat treating. ASME B16.5 or ASME B16.47 flanges made of ASTM A182 Gr. F11 Cl. 2 steels shall be furnished in normalizing and tempering condition only. The minimum austenitizing temperature is 900°C [1650°F]. The normalizing requires air cooling, which is followed by tempering with minimum tempering temperature of 620°C [1150°F].

Pressure-Temperature Ratings

Temp.
°F
75#
psig
150#
psig
300#
psig
-20~100145290750
200130260750
300115230720
400100200695
50085170665
60070140605
65060125590
700-110570
750-95530
800-80510
850-65485
900-50450
950-35320
1000-20215
1050--145
1100--95
1150--65
1200--40
*Pressure-Temperature ratings for ASTM A182 Gr. F11 Cl. 2 flanges of Class 75, 150 and 300; Values in “75#” column only applies to ASME B16.47 Series B Class 75 flanges; Values in columns “150#” and “300#” are applicable to both ASME B16.5 and B16.47 flanges of Class 150 and Class 300, respectively.

Temp.
°F
400#
psig
600#
psig
900#
psig
-20~100100015002250
200100015002250
30096514452165
40092513852080
50088513301995
60080512101815
65078511751765
70075511351705
75071010651595
80067510151525
8506509751460
9006009001350
950425640955
1000290430650
1050190290430
1100130190290
115085130195
12005580125
*Pressure-Temperature ratings for ASTM A182 Gr. F11 Cl. 2 flanges of Class 400, 600 and 900; applicable to both ASME B16.5 and B16.47 flanges.

Temp.
°F
1500#
psig
2500#
psig
-20~10037506250
20037506250
30036106015
40034655775
50033255540
60030255040
65029404905
70028404730
75026604430
80025404230
85024354060
90022453745
95015952655
100010801800
10507201200
1100480800
1150325545
1200205345
*Pressure-Temperature ratings for ASTM A182 Gr. F11 Cl. 2 flanges of Class 1500 and 2500; applicable to ASME B16.5 flanges only.

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