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What is Stainless Steel Blind Flange
Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels. A cover plate can be connected to create a "blind flange". Flanges are joined by bolting, and sealing is often completed with the use of gaskets or other methods.
Stainless Steel blind flanges are generally different from other types of weld fittings. This is because they do have the typical bolt holes around the perimeter, but they don't have the typical hole that moves through the center of pipe flanges.
Stainless Steel Blind Flange is a solid disk used to block off a pipeline or to create a stop. It is useful for making repairs to a pipeline and also for expansion or continuation of the pipeline simply by adding onto the final flange.
Sealing Surface of Blind Flange
Raised Face (RF)
Flat Faced (FF)
Blind flange RF, it it better recommend a standard ring gasket that is appropriate for the service and test.
Blind flange FF, it will be good use a full face gasket, due to against the handle of bending forces.
Blind Flange Specification
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2"- 60" / DN15 - DN1500 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
| Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
ASTM A182 F316/316L Blind Flange
ASTM A182 F316/316L are both austenitic stainless steel materials, which are commonly used in the raw materials of ASTM A182 forged pipe fittings. Their performance is superior to 304 stainless steel, so they are widely used in pipeline systems.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F316 | MIN | 10.00 | 16.00 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.00 | 18.00 | 3.00 | 0.01 | |
| ASTM A182 F316L | MIN | 10.00 | 16.00 | 2.00 | ||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 18.00 | 3.00 | 0.01 |
Mechanical Properties
| MATERIAL | ASTM A182 F316 | ASTM A182 F316L |
| T.S (MPA) | 515 min | 485 min |
| Y.S (MPA) | 205 min | 170 min |
| EL % | 30 min | 30 min |
| R/A % | 50 min | 50 min |
Stainless Steel Blind Flange Identification Markings
ASME B16.5 Flange should having marking requirements as below:
• Name: Manufacturer name or trademark (As client requirement)
• Material: Flange material standard. For example : ASTM 182 F316 Blind Flange
• Pressure Ratings: Class 150/300/600/900/1500/2500
• Conformance: ASME B16.5 / B16.47
• Size: 1/2"- 60" ( DN15 - DN1500 )
What is Stainless Steel Blind Flange
Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels. A cover plate can be connected to create a "blind flange". Flanges are joined by bolting, and sealing is often completed with the use of gaskets or other methods.
Stainless Steel blind flanges are generally different from other types of weld fittings. This is because they do have the typical bolt holes around the perimeter, but they don't have the typical hole that moves through the center of pipe flanges.
Stainless Steel Blind Flange is a solid disk used to block off a pipeline or to create a stop. It is useful for making repairs to a pipeline and also for expansion or continuation of the pipeline simply by adding onto the final flange.
Sealing Surface of Blind Flange
Raised Face (RF)
Flat Faced (FF)
Blind flange RF, it it better recommend a standard ring gasket that is appropriate for the service and test.
Blind flange FF, it will be good use a full face gasket, due to against the handle of bending forces.
Blind Flange Specification
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2"- 60" / DN15 - DN1500 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
| Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
ASTM A182 F316/316L Blind Flange
ASTM A182 F316/316L are both austenitic stainless steel materials, which are commonly used in the raw materials of ASTM A182 forged pipe fittings. Their performance is superior to 304 stainless steel, so they are widely used in pipeline systems.
Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F316 | MIN | 10.00 | 16.00 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.00 | 18.00 | 3.00 | 0.01 | |
| ASTM A182 F316L | MIN | 10.00 | 16.00 | 2.00 | ||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 18.00 | 3.00 | 0.01 |
Mechanical Properties
| MATERIAL | ASTM A182 F316 | ASTM A182 F316L |
| T.S (MPA) | 515 min | 485 min |
| Y.S (MPA) | 205 min | 170 min |
| EL % | 30 min | 30 min |
| R/A % | 50 min | 50 min |
Stainless Steel Blind Flange Identification Markings
ASME B16.5 Flange should having marking requirements as below:
• Name: Manufacturer name or trademark (As client requirement)
• Material: Flange material standard. For example : ASTM 182 F316 Blind Flange
• Pressure Ratings: Class 150/300/600/900/1500/2500
• Conformance: ASME B16.5 / B16.47
• Size: 1/2"- 60" ( DN15 - DN1500 )
