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How to Identify a Class 600 Threaded Flange
Threaded standard for the connection type of the flange, which means in which way the flange will be connected to the main pipeline. There are mainly six different types of forged steel flange, blind, welding neck, socked weld, threaded, slip on and lap joint. Class 600 stand for the pressure rating of the flange, which is the maxim working pressure of the flange's working environment.
Despite of these two description, there are still any words we should focus on, class 600 threaded flange is far from enough for us to specify a exact product.
Material of Forged Steel Flange
The raw material of forges steel flange is bar billet in carbon steel, alloy steel and stainless steel. After cutting continuously being hammered, it will have the shape and do further process on turning-lathe. The material normally include below different grades.
Stainless steel: ASTM A182 F304/304L, F316/316L, other high class stainless steel.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F304 | MIN | 8.0 | 18.0 | |||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | 0.10 | ||
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.01 |
Alloy steel : ASTM A182 F5, F9, F11, F12, F21, F22, other high alloy steel.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
| ASTM A182 F5 | MIN | 0.30 | 4.00 | 0.44 | |||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 0.50 | 0.50 | 6.00 | 0.65 | |
| ASTM A182 F9 | MIN | 0.30 | 0.50 | 8.00 | 0.90 | ||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 1.00 | 10.00 | 1.10 |
Carbon steel : ASTM A105, ASTM A694 F42, F46,F52,F60, F65 and F70, ASTM A350 LF2.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
| ASTM A105 | MIN | 0.60 | 0.10 | ||||||||
| MAX | 0.35 | 1.05 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 |
In this difference, a class 600 threaded flange can have many different possible choice.
Dimensions of Class 600 Threaded Flange in ASME B16.5 standard
Class 600 threaded flange whose size is under 24 inches, its dimension and general requirement can be found in different countrie's standard , and ASME 16.5 standard is the one made by American Society of Mechanical Engineers, which makes it the mostly commonly used one.
Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. | Diameter of Raised Face | Length Hub | Thread Length | Diam. | Diam. | Number | Diam. of | |
inch | dn | O | C | X | G | Y | T | BC | BH | BN | BD |
1/2″ | 15 | 95.5 | 14.2 | 38.1 | 35.1 | 22.4 | 22.4 | 66.5 | 15.7 | 4 | 1/2″ |
3/4″ | 20 | 117. 5 | 15.7 | 47.8 | 42.9 | 25.4 | 27.7 | 82.6 | 19.1 | 4 | 5/8″ |
1″ | 25 | 124. 0 | 17.5 | 53.8 | 50.8 | 26.9 | 34.5 | 88.9 | 19.1 | 4 | 5/8″ |
1-1/4″ | 32 | 133. 5 | 20.6 | 63.5 | 63.5 | 28.4 | 43.2 | 98.6 | 19.1 | 4 | 5/8″ |
1-1/2″ | 40 | 155. 5 | 22.4 | 69.9 | 73.2 | 31.8 | 49.5 | 114.3 | 22.4 | 4 | 3/4″ |
2″ | 50 | 165. 0 | 25.4 | 84.1 | 91.9 | 36.6 | 62 | 127 | 19.1 | 8 | 5/8″ |
2-1/2″ | 65 | 190. 5 | 28.4 | 100.1 | 104.6 | 41.1 | 74.7 | 149.4 | 22.4 | 8 | 3/4″ |
3″ | 80 | 209. 5 | 31.8 | 117.3 | 127 | 46 | 90.7 | 168.1 | 22.4 | 8 | 3/4″ |
3-1/2″ | 90 | 228. 5 | 35.1 | 133.4 | 139.7 | 49.3 | 103.4 | 184.2 | 25.4 | 8 | 7/8″ |
4″ | 100 | 273. 0 | 38.1 | 152.4 | 157.2 | 53.8 | 116.1 | 215.9 | 25.4 | 8 | 7/8″ |
5″ | 125 | 330. 0 | 44.5 | 189 | 185.7 | 60.5 | 143.8 | 266.7 | 28.4 | 8 | 1″ |
6″ | 150 | 355. 5 | 47.8 | 222.3 | 215.9 | 66.5 | 170.7 | 292.1 | 28.4 | 12 | 1″ |
8″ | 200 | 419. 0 | 55.6 | 273.1 | 269.7 | 76.2 | 221.5 | 349.3 | 31.8 | 12 | 1 1/8″ |
10″ | 250 | 508. 0 | 63.5 | 342.9 | 323.9 | 85.9 | 276.4 | 431.8 | 35.1 | 16 | 1 1/4″ |
12″ | 300 | 559. 0 | 66.5 | 400.1 | 381 | 91.9 | 327.2 | 489 | 35.1 | 20 | 1 1/4″ |
14″ | 350 | 603. 5 | 69.9 | 431.8 | 412.8 | 93.7 | 359.2 | 527.1 | 38.1 | 20 | 1 3/8″ |
16″ | 400 | 686. 0 | 76.2 | 495.3 | 469.9 | 106. 4 | 410.5 | 603.3 | 41.1 | 20 | 1 1/2″ |
18″ | 450 | 743. 0 | 82.6 | 546.1 | 533.4 | 117. 3 | 461.8 | 654.1 | 44.5 | 20 | 1 5/8″ |
20″ | 500 | 813. 0 | 88.9 | 609.6 | 584.2 | 127. 0 | 513.1 | 723.9 | 44.5 | 24 | 1 5/8″ |
24″ | 600 | 940. 0 | 101.6 | 717.6 | 692.2 | 139. 7 | 616 | 838.2 | 50.8 | 24 | 1 7/8″ |
Sealing Face of Forged Steel Flanges
Another important thing is about the flanges sealing face types, even though it won't have effect on the price of the flange, it decide the gasket type and sealing system of the pipeline. Basically there are four different types of the sealing face in a flange: raised face(RF). flat face(FF), male face(MF) and ring-type joint face(RTJ).
Raised Face(RF)
Flat Face(FF)
Ring-Type Joint Face(RTJ)
How to Identify a Class 600 Threaded Flange
Threaded standard for the connection type of the flange, which means in which way the flange will be connected to the main pipeline. There are mainly six different types of forged steel flange, blind, welding neck, socked weld, threaded, slip on and lap joint. Class 600 stand for the pressure rating of the flange, which is the maxim working pressure of the flange's working environment.
Despite of these two description, there are still any words we should focus on, class 600 threaded flange is far from enough for us to specify a exact product.
Material of Forged Steel Flange
The raw material of forges steel flange is bar billet in carbon steel, alloy steel and stainless steel. After cutting continuously being hammered, it will have the shape and do further process on turning-lathe. The material normally include below different grades.
Stainless steel: ASTM A182 F304/304L, F316/316L, other high class stainless steel.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F304 | MIN | 8.0 | 18.0 | |||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | 0.10 | ||
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.01 |
Alloy steel : ASTM A182 F5, F9, F11, F12, F21, F22, other high alloy steel.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
| ASTM A182 F5 | MIN | 0.30 | 4.00 | 0.44 | |||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 0.50 | 0.50 | 6.00 | 0.65 | |
| ASTM A182 F9 | MIN | 0.30 | 0.50 | 8.00 | 0.90 | ||||
| MAX | 0.15 | 0.60 | 0.030 | 0.030 | 1.00 | 10.00 | 1.10 |
Carbon steel : ASTM A105, ASTM A694 F42, F46,F52,F60, F65 and F70, ASTM A350 LF2.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
| ASTM A105 | MIN | 0.60 | 0.10 | ||||||||
| MAX | 0.35 | 1.05 | 0.035 | 0.040 | 0.35 | 0.40 | 0.40 | 0.30 | 0.12 | 0.08 |
In this difference, a class 600 threaded flange can have many different possible choice.
Dimensions of Class 600 Threaded Flange in ASME B16.5 standard
Class 600 threaded flange whose size is under 24 inches, its dimension and general requirement can be found in different countrie's standard , and ASME 16.5 standard is the one made by American Society of Mechanical Engineers, which makes it the mostly commonly used one.
Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. | Diameter of Raised Face | Length Hub | Thread Length | Diam. | Diam. | Number | Diam. of | |
inch | dn | O | C | X | G | Y | T | BC | BH | BN | BD |
1/2″ | 15 | 95.5 | 14.2 | 38.1 | 35.1 | 22.4 | 22.4 | 66.5 | 15.7 | 4 | 1/2″ |
3/4″ | 20 | 117. 5 | 15.7 | 47.8 | 42.9 | 25.4 | 27.7 | 82.6 | 19.1 | 4 | 5/8″ |
1″ | 25 | 124. 0 | 17.5 | 53.8 | 50.8 | 26.9 | 34.5 | 88.9 | 19.1 | 4 | 5/8″ |
1-1/4″ | 32 | 133. 5 | 20.6 | 63.5 | 63.5 | 28.4 | 43.2 | 98.6 | 19.1 | 4 | 5/8″ |
1-1/2″ | 40 | 155. 5 | 22.4 | 69.9 | 73.2 | 31.8 | 49.5 | 114.3 | 22.4 | 4 | 3/4″ |
2″ | 50 | 165. 0 | 25.4 | 84.1 | 91.9 | 36.6 | 62 | 127 | 19.1 | 8 | 5/8″ |
2-1/2″ | 65 | 190. 5 | 28.4 | 100.1 | 104.6 | 41.1 | 74.7 | 149.4 | 22.4 | 8 | 3/4″ |
3″ | 80 | 209. 5 | 31.8 | 117.3 | 127 | 46 | 90.7 | 168.1 | 22.4 | 8 | 3/4″ |
3-1/2″ | 90 | 228. 5 | 35.1 | 133.4 | 139.7 | 49.3 | 103.4 | 184.2 | 25.4 | 8 | 7/8″ |
4″ | 100 | 273. 0 | 38.1 | 152.4 | 157.2 | 53.8 | 116.1 | 215.9 | 25.4 | 8 | 7/8″ |
5″ | 125 | 330. 0 | 44.5 | 189 | 185.7 | 60.5 | 143.8 | 266.7 | 28.4 | 8 | 1″ |
6″ | 150 | 355. 5 | 47.8 | 222.3 | 215.9 | 66.5 | 170.7 | 292.1 | 28.4 | 12 | 1″ |
8″ | 200 | 419. 0 | 55.6 | 273.1 | 269.7 | 76.2 | 221.5 | 349.3 | 31.8 | 12 | 1 1/8″ |
10″ | 250 | 508. 0 | 63.5 | 342.9 | 323.9 | 85.9 | 276.4 | 431.8 | 35.1 | 16 | 1 1/4″ |
12″ | 300 | 559. 0 | 66.5 | 400.1 | 381 | 91.9 | 327.2 | 489 | 35.1 | 20 | 1 1/4″ |
14″ | 350 | 603. 5 | 69.9 | 431.8 | 412.8 | 93.7 | 359.2 | 527.1 | 38.1 | 20 | 1 3/8″ |
16″ | 400 | 686. 0 | 76.2 | 495.3 | 469.9 | 106. 4 | 410.5 | 603.3 | 41.1 | 20 | 1 1/2″ |
18″ | 450 | 743. 0 | 82.6 | 546.1 | 533.4 | 117. 3 | 461.8 | 654.1 | 44.5 | 20 | 1 5/8″ |
20″ | 500 | 813. 0 | 88.9 | 609.6 | 584.2 | 127. 0 | 513.1 | 723.9 | 44.5 | 24 | 1 5/8″ |
24″ | 600 | 940. 0 | 101.6 | 717.6 | 692.2 | 139. 7 | 616 | 838.2 | 50.8 | 24 | 1 7/8″ |
Sealing Face of Forged Steel Flanges
Another important thing is about the flanges sealing face types, even though it won't have effect on the price of the flange, it decide the gasket type and sealing system of the pipeline. Basically there are four different types of the sealing face in a flange: raised face(RF). flat face(FF), male face(MF) and ring-type joint face(RTJ).
Raised Face(RF)
Flat Face(FF)
Ring-Type Joint Face(RTJ)
