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What is the Slip On Flange
Alloy steel slip-on flange is connected to the pipe by two welds, one on the backside and the other on the inside. The internal weld of the flange to the pipe is recessed by at least the thickness of the wall plus 3 millimeters (3/16”) of an inch.
Alloy steel slip-on flanges are a form of flat welding flange. Flat welding is only used to weld the outer layer, not the inner layer. In general, a flat welding flange, such as an ASME B16.5 Class 600 Slip On Flange, may be utilized in both medium and low-pressure pipelines.
The nominal pressure of these pipes with Tapped Slip On Flange is less than 2.5 MPa. Fillet welding is done after the Slip-On Flange with Raised Face Pn16 is put over the pipe. API 6A SORF Flanges are straightforward to use in fabricated applications.
Specification for Slip On Flange
Sealing Face | RF, FF, FTJ |
Size Range | 1/2" - 24" / DN15 - DN600 |
Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 |
Standard | ANSI / ASME B16.5, EN1092-1 |
Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
Different Connection Methods WN and SO Flange
Weld Neck Flange (WN)
Slip On Flange (SO)
The biggest difference in structure between the neck welded flange and the neck butt welded flange is the difference in the connection method of the nozzle and the flange. The neck welded flange is generally connected to the flange and the flange , But the neck butt welding flange is the flange butt joint. Flat welded flanges can generally only be connected to pipes, but not directly to butt welded fittings; butt welded flanges can generally be directly connected to all butt welded pipe fittings (including elbows, tees, reducers, etc.), of course Also includes pipes.
Material for Alloy Steel Flange
Alloy steel slip on flanges are mainly made up of chromium, molybdenum, and nickel composition along with other products. These flanges show excellent corrosion and oxidation resistance. They are widely used in water lines, oil, and gas, chemical plants, food production systems, etc.
Alloy steel slip on flanges are suitable for demanding applications that require enhanced strength, toughness, and wear resistance. Common alloy steel materials used for flange production include ASTM A182, F5, F9, F11, F22, and F91. Alloy steel flanges offer exceptional performance under high-pressure and high-temperature conditions.
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 | ||
| ASTM A182 F12 CL1 | MIN | 0.05 | 0.30 | 0.80 | 0.44 | ||||
| MAX | 0.15 | 0.60 | 0.45 | 0.45 | 0.50 | 1.25 | 0.65 | ||
| ASTM A182 F12 CL2 | MIN | 0.10 | 0.30 | 0.10 | 0.80 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.40 | 0.40 | 0.60 | 1.25 | 0.65 | ||
| ASTM A182 F11 CL1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.04 | 0.04 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL3 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 |
Mechanical Properties
| MATERIAL | ASTM A182 F5 | ASTM A182 F9 | ASTM A182 F12 CL1 | ASTM A182 F12 CL2 | ASTM A182 F11 CL1 | ASTM A182 F11 CL2 | ASTM A182 F11 CL3 |
| T.S (MPA) | 485 min | 585 min | 415 min | 485 min | 415 min | 485 min | 515 min |
| Y.S (MPA) | 275 min | 380 min | 220 min | 275 min | 205 min | 275 min | 310 min |
| EL % | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min |
| R/A % | 35 min | 40 min | 45 min | 30 min | 45 min | 30 min | 30 min |
| HARDNESS | 143-217 | 179-217 | 121-174 | 143-207 | 121-174 | 143-207 | 150-207 |
Applications of Alloy Steel Flanges
Alloy steel slip on flanges are used in a wide range of applications in various industries. Here are some of the most common applications of alloy steel flanges:
Oil and Gas Industry: Alloy steel slip on flanges are commonly used in the oil and gas industry for pipeline connections and valve connections, where high strength, corrosion resistance, and durability are required.
Petrochemical Industry: Alloy steel flanges are used in the petrochemical industry for pipeline connections and equipment connections in corrosive environments.
Chemical Industry: Alloy steel slip on flanges are used in the chemical industry for pipeline connections and equipment connections where high strength, corrosion resistance, and durability are required.
Power Generation Industry: Alloy steel slip on flanges are used in the power generation industry for steam and gas turbine connections, where high temperatures and pressures are present.
What is the Slip On Flange
Alloy steel slip-on flange is connected to the pipe by two welds, one on the backside and the other on the inside. The internal weld of the flange to the pipe is recessed by at least the thickness of the wall plus 3 millimeters (3/16”) of an inch.
Alloy steel slip-on flanges are a form of flat welding flange. Flat welding is only used to weld the outer layer, not the inner layer. In general, a flat welding flange, such as an ASME B16.5 Class 600 Slip On Flange, may be utilized in both medium and low-pressure pipelines.
The nominal pressure of these pipes with Tapped Slip On Flange is less than 2.5 MPa. Fillet welding is done after the Slip-On Flange with Raised Face Pn16 is put over the pipe. API 6A SORF Flanges are straightforward to use in fabricated applications.
Specification for Slip On Flange
Sealing Face | RF, FF, FTJ |
Size Range | 1/2" - 24" / DN15 - DN600 |
Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 |
Standard | ANSI / ASME B16.5, EN1092-1 |
Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
Different Connection Methods WN and SO Flange
Weld Neck Flange (WN)
Slip On Flange (SO)
The biggest difference in structure between the neck welded flange and the neck butt welded flange is the difference in the connection method of the nozzle and the flange. The neck welded flange is generally connected to the flange and the flange , But the neck butt welding flange is the flange butt joint. Flat welded flanges can generally only be connected to pipes, but not directly to butt welded fittings; butt welded flanges can generally be directly connected to all butt welded pipe fittings (including elbows, tees, reducers, etc.), of course Also includes pipes.
Material for Alloy Steel Flange
Alloy steel slip on flanges are mainly made up of chromium, molybdenum, and nickel composition along with other products. These flanges show excellent corrosion and oxidation resistance. They are widely used in water lines, oil, and gas, chemical plants, food production systems, etc.
Alloy steel slip on flanges are suitable for demanding applications that require enhanced strength, toughness, and wear resistance. Common alloy steel materials used for flange production include ASTM A182, F5, F9, F11, F22, and F91. Alloy steel flanges offer exceptional performance under high-pressure and high-temperature conditions.
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 | ||
| ASTM A182 F12 CL1 | MIN | 0.05 | 0.30 | 0.80 | 0.44 | ||||
| MAX | 0.15 | 0.60 | 0.45 | 0.45 | 0.50 | 1.25 | 0.65 | ||
| ASTM A182 F12 CL2 | MIN | 0.10 | 0.30 | 0.10 | 0.80 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.40 | 0.40 | 0.60 | 1.25 | 0.65 | ||
| ASTM A182 F11 CL1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.20 | 0.80 | 0.04 | 0.04 | 1.00 | 1.50 | 0.65 | ||
| ASTM A182 F11 CL3 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | |||
| MAX | 0.15 | 0.60 | 0.03 | 0.03 | 1.00 | 1.50 | 0.65 |
Mechanical Properties
| MATERIAL | ASTM A182 F5 | ASTM A182 F9 | ASTM A182 F12 CL1 | ASTM A182 F12 CL2 | ASTM A182 F11 CL1 | ASTM A182 F11 CL2 | ASTM A182 F11 CL3 |
| T.S (MPA) | 485 min | 585 min | 415 min | 485 min | 415 min | 485 min | 515 min |
| Y.S (MPA) | 275 min | 380 min | 220 min | 275 min | 205 min | 275 min | 310 min |
| EL % | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min | 20 min |
| R/A % | 35 min | 40 min | 45 min | 30 min | 45 min | 30 min | 30 min |
| HARDNESS | 143-217 | 179-217 | 121-174 | 143-207 | 121-174 | 143-207 | 150-207 |
Applications of Alloy Steel Flanges
Alloy steel slip on flanges are used in a wide range of applications in various industries. Here are some of the most common applications of alloy steel flanges:
Oil and Gas Industry: Alloy steel slip on flanges are commonly used in the oil and gas industry for pipeline connections and valve connections, where high strength, corrosion resistance, and durability are required.
Petrochemical Industry: Alloy steel flanges are used in the petrochemical industry for pipeline connections and equipment connections in corrosive environments.
Chemical Industry: Alloy steel slip on flanges are used in the chemical industry for pipeline connections and equipment connections where high strength, corrosion resistance, and durability are required.
Power Generation Industry: Alloy steel slip on flanges are used in the power generation industry for steam and gas turbine connections, where high temperatures and pressures are present.
