FLANGE MATERIALS

Flanges are available various materials such as carbon steel, austenitic / martensitic / ferritic / duplex stainless steel, cast iron, aluminum, brass, bronze, plastic, etc. For specific services, flanges may be internally lined with protective materials (as pipes and fittings) or even painted externally. The material grade of steel flanges shall match the material grade of the joined pipes.

The most common materials for flanges are:

  • Carbon steel
    • ASTM A 105 / A 266 Gr. 2 (high temperature carbon steel)
    • ASTM A350 LF1 to LF3 (low temperature carbon steel)
    • ASTM A694 Gr. F42 / F52 / F56 / F60 / F65 (high yield carbon steel flange to match API 5L linepipes)
       
  • Alloy Steel
    • ASTM A182 Gr. F1 / F2 / F5 / F9 / F11 Cl. 2 /  F12 Cl. 2 / F22 Cl. 3 / F91 (alloy steel flanges)
       
  • Stainless / Duplex Steel
    • ASTM A182 F 304/304L, 316/316L, 321, 347, 348 (stainless steel flanges), 904/904L
    • ASTM A182 F51 (duplex flanges) / F53-F55 (superduplex)
       
  • Nickel Alloys / Superalloys
    • ASTM B166 UNS NO6600 (inconel 600)
    • ASTM B564 UNS N06625 (Inconel 625)
    • ASTM B425 UNS-NO8800 (Incoloy 800)
    • ASTM B564 UNS N08825 (Incoloy 825)
    • ASTM B160 UNS N0200 (Nickel 200)
    • ASTM B564 UNS N04400 (Monel 400)
    • ASTM B564 UNS N10276 (Hastelloy C-276)
       
  • Titanium
    • ASTM B381 Gr. 2 (Titanium)

 

ASTM A105 CARBON STEEL FLANGES

CHEMICAL COMPOSITION

Composition, %
Element C Mn P S Si Cu Ni Cr Mo V
  0.35 max 0.60-1.05 0.035 max 0.040
max
0.10-0.35 0.40
max (1)
0.40
max (1)
0.30
max (1-2)
0.12
max (1-2)
0.08
max

Notes:

  1. The total of Cu, Ni, Niobium, Moly and Vanadium shall not exceed 1.00%.
  2. The sum of Niobium and Molybdenum shall not exceed 0.32%.

 

MAX WORKING PRESSURE

(Max working pressure of carbon steel / low alloy steel flanges ASTM A105 / ASTM A350 - by Class, in bar)

TEMP. C 150# 300# 400# 600# 900# 1500# 2500#
-29 to 38 19.6 51.1 68.1 102.1 153.2 255.3 425.5
50 19.2 50.1 66.8 100.2 150.4 250.6 417.7
100 17.7 46.6 62.1 93.2 139.8 233 388.3
150 15.8 45.1 60.1 90.2 135.2 225.4 375.6
200 13.8 43.8 58.4 87.6 131.4 219 365
250 12.1 41.9 55.9 83.9 125.8 209.7 349.5
300 10.2 39.8 53.1 79.6 119.5 199.1 331.8
325 9.3 38.7 51.6 77.4 116.1 193.6 322.6
350 8.4 37.6 50.1 75.1 112.7 187.8 313
375 7.4 36.4 48.5 72.7 109.1 181.8 303.1
400 6.5 34.7 46.3 69.4 104.2 173.6 289.3
425 5.5 28.8 38.4 57.5 86.3 143.8 239.7
450 4.6 23 30.7 46 69 115 191.7
475 3.7 17.4 23.2 34.9 52.3 87.2 145.3
500 2.8 11.8 15.7 23.5 35.3 58.8 97.9
538 1.4 5.9 7.9 11.8 17.7 29.5 49.2
 

FLANGE SERVICE BY MATERIAL GRADE

MATERIAL MATERIAL GROUP FLANGE SERVICE CAST GRADE
A105 Carbon Steel Carbon steel flanges for general service such as oil, oil vapor, gas, steam and water at temperatures -20°F to 1000°F (-28°C to 537°C). ASTM A216-WCB
A350-LF2 CL1 Low Temperature Carbon Steel Low temp. carbon steel flanges suitable for temperatures -50°F and not above 650°F (-46°C and not above 343°C). ASTM A352-LCB
A182-F11 CL2 1 1/4% Cr, 1/2% Mo Alloy Steel Alloy steel flanges for high temperatures from -20°F to 1100°F to minimize graphitization (-28°C to 593§C). ASTM A217-WC6
A182-F22 CL3 2 1/4% Cr, 1% Mo Alloy Steel Alloy steel flanges for services requiring greater strength than F11 at temperatures from -20°F to 1100°F (-28°C to 593°C). ASTM A217-WC9
A182-F5 5% Cr, 1/2% Mo Alloy Steel Alloy steel flanges for corrosive/erosive refinery use requiring resistance at temperatures from -20°F to 1100§F (-28°C to 590°C). ASTM A217-C5
A182-F9 9% Cr, 1% Mo Alloy Steel Alloy steel flanges for services involving media with higher Sulphur content to combat oxidation to 1100oF (593°C). ASTM A217-C12

ASTM A182 STAINLESS STEEL FLANGES

CHEMICAL COMPOSITION

Composition, %
Grade C Mn P S Si Ni Cr Mo Nb Ti Others
F304(1) 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0        
F304H 0.04-0.10 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0        
F304L(1) 0.030 2.0 0.045 0.030 1.0 8.0-13.0 18.0-20.0        
F304N(2) 0.08 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0        
F304LN(2) 0.030 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0        
F309H 0.04-0.10 2.0 0.045 0.030 1.0 12.0-15.0 22.0-24.0        
F310 0.25 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0        
F310H 0.04-0.10 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0        
F310MoLN 0.030 2.0 0.030 0.015 0.40 21.0-23.0 24.0-26.0 2.0-3.0     N 0.10-0.16
F316 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0      
F316H 0.04-0.10 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0      
F316L(1) 0.030 2.0 0.045 0.030 1.0 10.0-15.0 16.0-18.0 2.0-3.0      
F316N(2) 0.08 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0      
F316LN(2) 0.030 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0      
F316Ti 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0   (3) N 0.10 max
F317 0.08 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0      
F317L 0.030 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0      
F321 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0     (4)  
F321H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0     (5)  
F347 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0   (6)    
F347H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0   (7)    
F348 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0   (6)   Co 0.20
Ta 0.10
F348H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0   (7)   Co 0.20
Ta 0.10

Notes:

  1. Grades F304, F304L, F316, and F316L shall have a maximum Nitrogen of 0.10%.
  2. Grades F304N, F316N, F304LN, and F316LN shall have a Nitrogen of 0.10 to 0.16%.
  3. Grade F316Ti shall have a Titanium content five times above the Carbon plus Nitrogen and not more than 0.70%.
  4. Grade F321 shall have a Titanium content five times above the Carbon and not more than 0.70%.
  5. Grade F321H shall have a Titanium content four times above the Carbon and not more than 0.70%.
  6. Grades F347 and F348 shall have a Niobium content ten times above the Carbon and not more than 1.10%.
  7. Grades F347H and F348H shall have a Niobium content above than eight times the Carbon and not more than 1.10%.
     

MAX WORKING PRESSURE

(Max working pressure of carbon stainless steel flanges ASTM A182 - by Class, in bar)

TEMP. C 150# 300# 400# 600# 900# 1500# 2500#
-29 to 38 15.9 41.4 55.2 82.7 124.1 206.8 344.7
50 15.3 40 53.4 80 120.1 200.1 333.5
100 13.3 34.8 46.4 69.6 104.4 173.9 289.9
150 12 31.4 41.9 62.8 94.2 157 261.6
200 11.2 29.2 38.9 58.3 87.5 145.8 243
250 10.5 27.5 36.6 54.9 82.4 137.3 228.9
300 10 26.1 34.8 52.1 78.2 130.3 217.2
325 9.3 25.5 34 51 76.4 127.4 212.3
350 8.4 25.1 33.4 50.1 75.2 125.4 208.9
375 7.4 24.8 33 49.5 74.3 123.8 206.3
400 6.5 24.3 32.4 48.6 72.9 121.5 202.5
425 5.5 23.9 31.8 47.7 71.6 119.3 198.8
450 4.6 23.4 31.2 46.8 70.2 117.1 195.1

FLANGE SERVICE BY MATERIAL GRADE

MATERIAL MATERIAL GROUP FLANGE SERVICE CAST GRADE
A182-F304 18% Cr, 8% Ni Stainless Steel Stainless steel flanges for corrosive services and atmospheres from -450°F to 1000°F (-268°C to 537°C). ASTM A351-CF8
A182-F316 18% Cr, 8% Ni, 2% Mo Stainless Steel Stainless steel flanges for superior resistance to corrosion from -450°F to 1000°F (-268°C to 537°C). ASTM A351-CF8M

 

PIPING MATERIALS MATCH TABLE

Material Group Pipes Wrought Fittings Flanges Valves Bolting Sets
Carbon Steel A106 Gr A A234 Gr WPA A105 A216 Gr WCB A193 Gr B7
A194 Gr 2H
A106 Gr B A234 Gr WPB A105 A216 Gr WCB
A106 Gr C A234 Gr WPC A105 A216 Gr WCB
 
Carbon Steel
Alloy
High-Temp
A335 Gr P1 A234 Gr WP1 A182 Gr F1 A217 Gr WC1 A193 Gr B7
A194 Gr 2H
A335 Gr P11 A234 Gr WP11 A182 Gr F11 A217 Gr WC6
A335 Gr P12 A234 Gr WP12 A182 Gr F12 A217 Gr WC6
A335 Gr P22 A234 Gr WP22 A182 Gr F22 A217 Gr WC9
A335 Gr P5 A234 Gr WP5 A182 Gr F5 A217 Gr C5
A335 Gr P9 A234 Gr WP9 A182 Gr F9 A217 Gr C12
 
Carbon Steel
Alloy
Low-Temp
A333 Gr 6 A420 Gr WPL6 A350 Gr LF2 A352 Gr LCB A320 Gr L7
A194 Gr 7
A333 Gr 3 A420 Gr WPL3 A350 Gr LF3 A352 Gr LC3
 
Austenitic
Stainless
Steel
A312 Gr TP304 A403 Gr WP304 A182 Gr F304 A182 Gr F304 A193 Gr B8
A194 Gr 8
A312 Gr TP316 A403 Gr WP316 A182 Gr F316 A182 Gr F316
A312 Gr TP321 A403 Gr WP321 A182 Gr F321 A182 Gr F321
A312 Gr TP347 A403 Gr WP347 A182 Gr F347 A182 Gr F347
Material Pipes Fttg Flg Valves Bolts & Nuts

 

ASTM vs. EN MATERIALS FOR FLANGES

Flanges
Material number EN ASTM
Carbon steel flanges
1.0038 RSt 37-2 S235JR -
1.0570 St 52-3 S355J2 (1.0577) -
1.0460 C 22.8 P250GH -
1.0432 C 21 - A 105
1.0352 - P245GH -
- - - -
Alloy steel flanges
1.5415 15 Mo 3 16Mo3 A 182 Grade F 1
1.7335 13 CrMo 4 4 13CrMo4-5 A 182 Grade F11, F12
1.7380 10 CrMo 9 10 11CrMo9-10 (1.7383) A 182 Grade F22
1.7362 12 CrMo 19 5 - A 182 Grade F5
- - - A 182 Grade F9
1.4903 - X10CrMoVNb9-1 A 182 Grade F91
Low temperature carbon steel flanges
1.5637 10 Ni 14 12Ni14 A 350 Grade LF3
1.0566 TStE 355 P355QH1 (1.0571) A 350 Grade LF2
- - - -
- - - -
High yield carbon steel flanges
- - - -
1.0486 StE 285 - A 694 Grade F42
1.0562 StE 355 P355N A 694 Grade F52
1.8902 StE 420 P420N A 694 Grade F60
1.8905 StE 460 P460N A 694 Grade F70
High yield steels
- - - -
- - - -
- - - -
- - - -
- - - -
Stainless steel flanges
1.4541 X 6 CrNiTi 18 10 X6CrNiTi18-10 A 182 Grade F321
1.4571 X 6 CrNiMoTi 17 12 2 X6CrNiMoTi17-12-2 A 182 Grade F316Ti
1.4301 X 5 CrNi 18 10 X5CrNi18-10 A 182 Grade F304
1.4306 X 2 CrNi 19 11 - A 182 Grade F304L
1.4307 - X2CrNi18-9 A 182 Grade F304L
1.4401 X 5 CrNiMo 17 12 2 X5CrNiMo17-12-2 A 182 Grade F316
1.4404 X 2 CrNiMo 17 13 2 X2CrNiMo17-12-2 A 182 Grade F316L
1.4462 X 2 CrNiMoN 22 5 3 X2CrNiMoN22-5-3 A 182 Grade F51 (Duplex)
1.4529 X 1 NiCrMoCuN 25 20 6 X1NiCrMoCuN25-20-7 UNS N 08926
1.4539 X 1 NiCrMoCuN 25 20 5 X1NiCrMoCu25-20-5 A 182 Grade F904L
1.4547 - X1CrNiMoCuN20-18-7 UNS S 31254

 

 

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