ASTM A182 F91 Flanges

ASTM A182 is a standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts used in high-temperature service. Among the various alloy steel grades covered by this specification, ASTM A182 F91 stands out as a popular choice for applications requiring high-temperature strength and corrosion resistance.

ASTM A182 F91 flanges are widely used in industries such as petrochemical, power generation, and oil and gas. These flanges are specifically designed for use in high-temperature, high-pressure environments, making them suitable for critical applications like steam and superheated steam transport.

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Key features of ASTM A182 F91 flanges:

1. High-Temperature Strength: F91 alloy steel is known for its exceptional strength and durability at elevated temperatures. It can withstand temperatures of up to 600°C (1,112°F), making it an ideal choice for applications involving hot gases and liquids.

2. Corrosion Resistance: F91 alloy steel contains chromium and molybdenum, which enhance its corrosion resistance. This property is crucial in environments where exposure to corrosive substances is common.

3. Weldability: ASTM A182 F91 flanges are readily weldable using various welding processes. This makes installation and maintenance more convenient.

4. Excellent Mechanical Properties: F91 steel has excellent mechanical properties, including high tensile and yield strength, which ensures the flanges can withstand the stresses and pressures encountered in high-temperature applications.

5. Precise Dimensional Standards: ASTM A182 specifies the dimensions, tolerances, and materials for F91 flanges, ensuring consistency and compatibility in various systems.

6. Versatility: These flanges come in a variety of types, including slip-on, weld neck, socket weld, and blind flanges, providing flexibility for different piping systems and connection methods.

Specification For Alloy Steel A182 F91 Flanges

StandardsASTM A182 / ASME SA182
DimensionsANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Size1/2″ (15 NB) to 48″ (1200NB)
Class150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
StandardANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Flange Face TypesFlate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Alloy Steel F91 Flanges

STOCKIST & SUPPILERS FOR ALLOY STEEL A182 F91 FLANGES IN INDIA, CUSTOM SIZES ASTM A182 F91 CHROME MOLY STEEL SORF, WNRF, Blind Flanges AS PER CLIENT REQUIREMENT

Equivalent Grades Of ASTM A182 F91 Alloy Steel Flanges

STANDARD UNS WERKSTOFF NR. EN DIN
Alloy Steel F91 K90901 1.4903 9Cr-1Mo-V X 10 CrMoVNb 9 1

Various Types of Alloy Steel A182 F91 Flanges

Carbon Steel Slip on Flanges

ASTM A182 F91 Slip On Flanges

  • ASTM 182 F91 Alloy Steel Slip On Flanges
  • ANSI B16.5 CrMo F91 Slip On Flanges
  • Chromium Molybdenum A182 F91 Slip On Flanges
  • A182 AS Grade F91 Slip On Flanges
  • Alloy Steel A182 Gr.F91 SOFF Flanges
  • Cr-Mo ASTM A182 F91 Slip On Flange
  • ASTM A182 Chrome Moly F91 SORF Flange
Carbon Steel Weld Neck Flanges

ASTM A182 F91 Socket Weld Flanges

  • Cr-Mo ASTM A182 F91 SocketWeld Flange
  • Chrome Moly A182 Gr.F91 SWFF Flanges
  • ASTM A182 Chromium Molybdenum Grade F91 SWRF Flange
  • Alloy Steel A182 F91 SocketWeld Flanges
  • ASTM 182 F91 Alloy Steel Socket Weld Flanges
  • ANSI B16.5 CrMo F91 Socket Weld Flanges
  • A182 AS F91 Socket Weld Flanges
Carbon Steel Blind Flanges

ASTM A182 F91 Blind Flanges

  • Alloy Steel ASTM A182 F91 Blind Flange
  • ASTM 182 F91 Alloy Steel Blind Flanges
  • A182 AS F91 Blind Flanges
  • Cr-Mo A182 F91 Blind Flanges
  • ASTM A182 Chromium Molybdenum F91 BLRF Flange
  • Chrome Moly A182 Gr.F91 BLFF Flanges
  • ANSI B16.5 AS F91 Blind Flanges
Carbon Steel SocketWeld Flanges

ASTM A182 F91 Weld Neck Flanges

  • Cr-Mo A182 F91 Weld Neck Flanges
  • ASTM 182 F91 Alloy Steel Weld Neck Flanges
  • A182 AS F91 Weld Neck Flanges
  • ANSI B16.5 AS F91 Weld Neck Flanges
  • ASTM A182 Chromium Molybdenum Grade F91 WNRF Flange
  • Alloy Steel ASTM A182 F91 Weld Neck Flange
  • Chrome Moly A182 Gr.F91 WNFF Flanges
Carbon Steel A105 Threaded Flanges

ASTM A182 F91 Threaded Flanges

  • ASTM A182 Chromium Molybdenum Grade F91 Screwed Flange
  • ANSI B16.5 AS F91 Threaded Flanges
  • Alloy Steel ASTM A182 F91 Threaded Flange
  • A182 AS F91 Threaded Flanges
  • Chrome Moly A182 Gr.F91 Screwed Flanges
  • Cr-Mo A182 F91 Threaded Flanges
  • ASTM 182 F91 Alloy Steel Threaded Flanges
Carbon Steel Lap Joint Flanges

ASTM A182 F91 Lap Joint Flanges

  • ASTM A182 Chromium Molybdenum F91 Lap Joint Flange
  • Chrome Moly A182 Gr.F91 LJ Flanges
  • A182 AS F91 Lap Joint Flanges
  • ASTM 182 F91 Alloy Steel Lap Joint Flanges
  • ANSI B16.5 AS F91 Lap Joint Flanges
  • Cr-Mo A182 F91 Lap Joint Flanges
  • Alloy Steel ASTM A182 F91 Lap Joint Flange

Ready Stock Of Alloy Steel A182 F91 Flanges

  • AS A182 F91 Tongue & Groove Flanges
  • Chrome Moly A182 F91 Long Weld Neck Flanges
  • ANSI B16.5 Alloy Steel F91 Class 300 Flanges Dimensions
  • AS A182 Gr F91 Flanges
  • ASTM A182 Grade F91 CrMo Reducing Flanges
  • A182 F91 Alloy Steel SORTJ Flange
  • ASTM A182 CrMo Grade F91 Plate Flanges
  • ASTM A182 F91 Alloy Steel Ring Type Joint Flanges
  • Alloy Steel ASTM A182 Gr.F91 DIN Flanges
  • ASTM A182 F91 Cr-Mo Spectacle Blind Flanges
  • A182 F91 Chrome Moly Spacer Ring Flanges
  • ASME B16.5 Class 150 Alloy Steel F91 Flanges
  • A182 F91 Chromium Molybdenum Pipe Flange
  • ASTM A182 F91 Alloy Steel Square Flanges
  • ASTM A182 F91 Alloy Steel Raised Face Flanges
  • AS ASTM A182 F91 Orifice Flange
  • A182 CrMo F91 Slip On Flat Face Flanges
  • Cr-Mo A182 Gr F91 Flat Face Flange
  • ASTM A182 Alloy Steel F91 Lap Joint Flanges
  • Chrome Moly ASTM A182 F91 Flanges
  • ASTM A182 Gr.F91 AS Large Diameter Flange
  • ASTM A182M Alloy Steel Grade F91 Flange
  • Chrome Moly A182 F91 Forged Flanges
  • Alloy Steel A182 Gr F91 Screwed Flanges
  • Alloy Steel A182 F91 BLRTJ Flanges
  • CrMo A182 F91 Nipoflange
  • Chromium Molybdenum A182 F91 NPT Threaded Flanges
  • ASTM A182 F91 CrMo Male & Female Flanges
  • Alloy Steel ASTM A182 F91 Industrial Flange
  • Cr-Mo ASTM A182 Grade F91 Flangeolet
  • ASTM A182 AS Gr F91 Paddle Blank and Spacer
  • Cr-Mo A182 F91 SORF Flanges
  • A182 F91 Chromium Molybdenum Blind Flange
  • ASTM A182 Gr.F91 CrMo Exhaust Flanges
  • Cr-Mo A182 F91 SWRTJ Flanges
  • A182 F91 Chromium Molybdenum Flange Pressure Rating
  • A182 F91 Alloy Steel Custom Flanges

ASTM A182 F91 Alloy Steel Flange Dimensions

NPS
(in.)
Alloy Steel A182 Flange Dimensions
Dia. of
Flange
(in.)
No.
of
Bolts
Dia. of
Bolts
(in.)
Dia. of
Bolt Holes
(in.)
Bolt
Circle
(in.)
1/43-3/841/20.622-1/4
1/23-1/241/20.622-3/8
3/43-7/841/20.622-3/4
14-1/441/20.623-1/8
1-1/44-5/841/20.623-1/2
1-1/2541/20.623-7/8
2645/80.754-3/4
2-1/2745/80.755-1/2
37-1/245/80.756
3-1/28-1/285/80.757
4985/80.757-1/2
51083/40.888-1/2
61183/40.889-1/2
813-1/283/40.8811-3/4
1016127/8114-1/4
1219127/8117
14211211.1218-3/4
1623-1/21611.1221-1/4
1825161-1/81.2522-3/4
2027-1/2201-1/81.2525
2432201-1/41.3829-1/2

Size Chart of ASTM A182 F91 Alloy Steel Flanges

Nominal Pipe Size Outside Diameter of Flanges Thickness of Flanges Diameter of Raised Face Diameter of Hub at Base Length Thru Hub Diameter or Bore Diameter of Hub at Bevel Radius of Fillet Depth of Socket
Welding Neck Slip-On Threaded Socket Lap Joint Slip-on Socket Lap Joint
O Q R X Y Y Y W B H r Z
1/2 3-1/2 7/16 1-3/8 1-3/16 1-7/8 5/8 5/8 .88 .90 .84 1/8 3/8
3/4 3-7/8 1/2 1-11/16 1-1/2 2-1/16 5/8 5/8 1.09 1.11 1.05 1/8 7/16
1 4-1/4 9/16 2 1-15/16 2-3/16 11/16 11/16 1.36 1.38 1.32 1/8 1/2
1-1/4 4-5/8 5/8 2-1/2 2-5/16 2-1/4 13/16 13/16 1.70 1.72 1.66 3/16 9/16
1-1/2 5 11/16 2-7/8 2-9/16 2-7/16 7/8 7/8 1.95 1.97 1.90 1/4 5/8
2 6 3/4 3-5/8 3-1/16 2-1/2 1 1 2.44 2.46 2.38 5/16 11/16
2-1/2 7 7/8 4-1/8 3-9/16 2-3/4 1-1/8 1-1/8 2.94 2.97 2.88 5/16 3/4
3 7-1/2 15/16 5 4-1/4 2-3/4 1-3/16 1-3/16 3.57 3.60 3.50 3/8 13/16
3-1/2 8-1/2 15/16 5-1/2 4-13/16 2-13/16 1-1/4 1-1/4 4.07 4.10 4.00 3/8 7/8
4 9 15/16 6-3/16 5-5/16 3 1-5/16 1-5/16 4.57 4.60 4.50 7/16 15/16
5 10 15/16 7.5/16 6-7/16 3-1/2 1-7/16 1-7/16 5.66 5.69 5.56 7/16 15/16
6 11 1 8-1/2 7-9/16 3-1/2 1-9/16 1-9/16 6.72 6.75 6.63 1/2 1-1/16
8 13-1/2 1-1/8 10-5/8 9-11/16 4 1-3/4 1-3/4 8.72 8.75 8.63 1/2 1-1/4
10 16 1-3/16 12-3/4 12 4 1-15/16 1-15/16 10.88 10.92 10.75 1/2 1-5/16
12 19 1-1/4 15 14-3/8 4-1/2 2-3/16 2-3/16 12.88 12.92 12.75 1/2 1-9/16
14 21 1-3/8 16-1/4 15-3/4 5 2-1/4 3-1/8 14.14 14.18 14.00 1/2 1-5/8
16 23-1/2 1-7/16 18-1/2 18 5 2-1/2 3-7/16 16.16 16.19 16.00 1/2 1-3/4
18 25 1-9/16 21 19-7/8 5-1/2 2-11/16 3-13/16 18.18 18.20 18.00 1/2 1-15/16
20 27-1/2 1-11/16 23 22 5-11/16 2-7/8 4-1/16 20.20 20.25 20.00 1/2 2-1/8
24 32 1-7/8 27-1/4 26-1/8 6 3-1/4 4-3/8 24.25 24.25 24.00 1/2 2-1/2

Weight Chart of ASTM A182 F91 Alloy Steel Flanges

Pipe Normal Diam. O.D. Flange Thk. Of Flange Min Diam.
of
Hub
Diameter of Raised Face Length Hub.Y Thread Length Diam.
of Bolt
Circle
Diam.
of Bolt
Holes
Number
of Bolts
Diam. of
Bolts
(inch)
KG LB
inch dn O C X G Y T BC BH BN BD
1/2″ 15 89.00 11.20 30.20 35.10 15.70 15.70 60.50 15.80 4 1/2″ 0.4 0.9
3/4″ 20 98.50 12.70 38.10 42.90 15.70 15.70 69.90 15.80 4 1/2″ 0.7 1.5
1″ 25 108.00 14.20 49.30 50.80 17.50 17.50 79.30 15.80 4 1/2″ 0.8 1.8
1-1/4″ 32 117.50 15.70 58.70 63.50 20.60 20.60 88.90 15.80 4 1/2″ 1.2 2.6
1-1/2″ 40 127.00 17.50 65.00 73.20 22.40 22.40 98.60 15.80 4 1/2″ 1.5 3.3
2″ 50 152.50 19.10 77.70 91.90 25.40 25.40 120.70 19.10 4 5/8″ 2.3 5.1
2-1/2″ 65 178.00 22.40 90.40 104.60 28.40 28.40 139.70 19.10 4 5/8″ 3.7 8.1
3″ 80 190.50 23.90 108.00 127.00 30.20 30.20 152.40 19.10 4 5/8″ 4.1 9
3-1/2″ 90 216.00 23.90 122.20 139.70 31.80 31.80 177.80 19.10 8 5/8″ 5.1 11.2
4″ 100 228.50 23.90 134.90 157.20 33.30 33.30 190.50 19.10 8 5/8″ 5.9 13
5″ 125 254.00 23.90 163.60 185.70 36.60 36.60 215.90 22.40 8 3/4″ 7 15.4
6″ 150 279.50 25.40 192.00 215.90 39.60 39.60 241.30 22.40 8 3/4″ 8.4 18.5
8″ 200 343.00 28.40 246.10 269.70 44.50 44.50 298.50 22.40 8 3/4″ 13 28.6
10″ 250 406.50 30.20 304.80 323.90 49.30 49.30 362.00 25.40 12 7/8″ 18 39.5
12″ 300 482.50 31.80 365.30 381.00 55.60 55.60 431.80 25.40 12 7/8″ 29 64
14″ 350 533.50 35.10 400.10 412.80 57.20 57.20 476.30 28.50 12 1″ 39 86
16″ 400 597.00 36.60 457.20 469.90 63.50 63.50 539.80 28.50 16 1″ 47 103
18″ 450 635.00 39.60 505.00 533.40 68.30 68.30 577.90 31.80 16 1 1/8″ 57 126
20″ 500 698.50 42.90 558.80 584.20 73.20 73.20 635.00 31.80 20 1 1/8″ 76 167
24″ 600 813.00 47.80 663.40 692.20 82.60 82.60 749.30 35.10 20 1 1/4″ 97 214

ASTM A182 F91 AS Flanges Chemical Composition

Grade C Mn P s Si Ni Cr Mo Cb
F91 0.08-0.12 0.30-0.60 0.020 0.010 0.20-0.50 0.40 8.0-9.5 0.85-1.05 0.06-0.10

ASTM A182 Alloy Steel F91 Flanges Mechanical Properties

Grade Tensilee Strength (Mpa) Yield Strength (Mpa) Elongation % Hardness
Rockwell B (HR B) max Brinell (HB) max
F91 415 585 20 248 max

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