Tianjin Baode Steel Co., Ltd.
We mainly produce seamless steel pipes, ERW steel pipes, LSAW steel pipes, SSAW steel pipes, as well as stainless steel, alloy steel elbows, tees, reducers, flanges, and other pipe fittings.
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BS 3293 Carbon Steel Pipe Flanges Over 24 Inch Nominal SizeBS 3293 Carbon Steel Pipe Flanges over 24 inch nominal size Standard: BS 3293 -For the Petroleum industry Type: Slip-on Type and Welding-Neck Pressure: Class 150,Class 300,Class 400,Class 600 Facing: Class 150 only have Raised Face,andread more
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ASME B16.5 ASTM A105 SORF Flange With PaintedProducts:ASME B16.5 ASTM A105 SORF Flange with painted Steel Grade: ASTM A105 Demension accoding ASME B 16.5 Flange type: SO (Slip-on) Flange Sealing surface: RF (Raised Face) Flange surface: painted/painting(yellow,black,white,red,greenread more
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Carbon Steel Welding Plate FlangeCarbon Steel welding plate flanges The applicable range of plate welding flanges has been increased from PN25 to PN40, and it is recommended not to use them in environments with strict requirements such as flammable, explosive, highlyread more
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ANSI B16.5 SORF FlangesProducts: ANSI B16.5 SORF Flanges Produce scope: 1: OD: 1/2-24 2: Pressure rating: Class 150,Class 300,Class 400,Class 600,Class 900,Class 1500 3: Brand: Baode 4: Material: Carbon Steel, Stainless Steel,Alloy Steel 5:MOQ: 1 pcs Flatread more
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Welding Plate FlangesProducts: welding plate Flanges welding plate flange(PL flanges) the sealing surface forms include RF and FF,Size from DN10-DN2000 and pressure from PN2.5-PN160.The common ones are PN6-PN40 with DN10-DN600 Advantages and disadvantages ofread more
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ANSI B16.5 Carbon Steel Slip On Raised Face FlangesProducts: ANSI B16.5 Carbon Steel Slip on raised face flanges ANSI B16.5 Carbon Steel Slip on Raised Face Flanges refers to a SORF flange made of carbon steel material that complies with the ANSI B16.5 standard. The following is a detailedread more
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6 Inch Slip on SO FlangesProducts: 6 inch slip-on Flanges. WNRF flange and SLIP ON flange are two common types of flanges, which differ in structure, application, and welding methods.read more
Why Choose Us
Our Certifications:
Our products are certified with ISO 9001, ISO 14001, and ISO 45001 standards. We are also recognized as an AAA Credit Enterprise.
Production Market:
Our pipe fittings are exported to over 40 countries and regions, including North America, South America, Southeast Asia, the Middle East, and Africa. Our products have received unanimous praise from both domestic and international customers.
Our Services:
We provide detailed product explanations, answer inquiries, offer solutions, and give product quotations. We keep customers updated on production progress, offer multiple payment methods, and arrange logistics and delivery. Additionally, we provide shipping schedule updates, pre-arrival reminders, and follow-up customer tracking services.

Slip on flange, also called SO flange. It's a kind of flange slides over the pipe with internal design is slightly larger than the pipe. Since the inner diameter of the flange is slightly larger than the outer diameter of the pipe, that is designed to slide over the end of a pipe. The SO flange can be directly connected to equipment or pipe by fillet weld at the top and bottom of the flange. It is used to insert the pipe into the inner hole of the flange.
Slip On SO Flange Specification:
|
Standard |
Type |
Class |
Size |
|
ASME B16.5 |
WN/LWN/SO/Blind/Lap Joint |
150#-2500# |
1/2"-24"(Except Blind Flange 2500lb 1/2"-12") |
|
DIN2543 |
SO flange |
PN16 |
DN10-DN1000 |
|
DIN2544 |
SO flange |
PN25 |
DN10-DN1000 |
|
DIN2545 |
SO flange |
PN40 |
DN10-DN500 |
|
Sealing Surface |
RF FF RTJ TF GF LF LM |
||
|
Flange Face Finish |
Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers) |
||
|
125-250 AARH(it is called smooth finish) |
|||
|
250-500 AARH(it is called stock finish) |
|||
|
Coating |
Vanish, yellow paint, anti-rust oil, galvanizing etc |
||
Advantages of Utilizing Slip-On Flanges
SO flanges offer the following advantages, making them a popular choice in numerous piping systems across different industries:
Ease of Installation
The slip-on design enables effortless mounting to the end of a pipe or fitting without intricate alignment procedures. This saves time and effort during installation, especially when many flanges are involved. They can also be adjusted slightly after sliding onto the pipe, simplifying proper alignment between pipes or fittings.
Cost-Effective Solution
The design of SO flanges is relatively simple, resulting in less manufacturing complexity and lower production costs than other types. This affordability makes them ideal, especially for projects with budget constraints. Furthermore, the reduced welding material results in cost savings on consumables like welding rods or wires.


Availability and Compatibility
They are conveniently accessible in various sizes, materials, and pressure ratings, simplifying the search for the ideal flange that meets specific needs. Moreover, they exhibit compatibility with diverse types of pipes and fittings, allowing for versatility in their usage. This compatibility extends to various materials including carbon, steel, and alloy materials enabling seamless integration with different systems.
Space Efficiency
SO flanges have a compact and streamlined design. They have a flat face, unlike weld neck or socket weld flanges with protruding necks or socket extensions. This design minimizes the overall footprint of the flange, allowing for more efficient use of space within the piping system. They also have a shorter length compared to other types.
Key Features of Slip-On Flanges:
Design:
Slip-on flanges have a flat face and are typically welded to the pipe after being slipped over it. This design allows for easy alignment and installation.
Installation:
They are easier to install compared to other flange types, as they do not require precise alignment of the pipe ends. The flange can be positioned and then welded in place.
Applications:
Slip-on flanges are commonly used in low-pressure applications and are suitable for various industries, including oil and gas, water treatment, and chemical processing.
Cost-Effectiveness:
Generally, slip-on flanges are more cost-effective than other types of flanges, such as weld neck flanges, due to their simpler design and installation process.
Cost-Effectiveness:
Generally, slip-on flanges are more cost-effective than other types of flanges, such as weld neck flanges, due to their simpler design and installation process.
Limitations:
While slip-on flanges are versatile, they may not be suitable for high-pressure applications due to the potential for leakage at the weld joint.
Slip On SO Flange Material Grades:
|
Carbon Steel |
ASTM /ASME A/SA105(N), A350 LF2/LF3, A694 F52, F56, F60, F65, F70 |
|
Alloy Steel |
ASTM/ASME A/SA 182 F5, F9, F11, F22, F91 |
|
Stainless Steel |
ASTM/ASME A/SA 182 F304, 304L, 304H, 310H, 316, 316H, 316L, |
|
Duplex and |
ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61, |
|
Nickel Alloy Steel |
ASTM/ASME B/SB 564 UNS N02200(NICKEL 200), UNS N04400, (MONEL 400), |
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ASTM/ASME B/SB160 UNS N02201(NICKEL 201), ASTM B/SB472 UNS N08020(Alloy 20) |
|
|
Copper Alloy |
ASTM/ASME B/SB151 UNS N07060, 71500, C70600(CuNi 90/10), C71500(CuNi 70/30) |
|
Titanium |
ASTM/ASME B/SB381 Grade 2, Grade 5, Grade 7 |
ASTM A105 for carbon steel slip on pipe flanges.
ASTM A182 for alloy and stainless slip on flanges. (Alloy for F11, F22, stainless for F304/F304L, F316/F316L)
ASME B16.5 for pipe flanges and flanged fittings.
BS 3293 DIN 86029

Dimensions and Pressure Ratings
Common outer diameters:
1/2'', 2'', 3'', 4'', 6'', 8'', 10'', 12'', to 24”.
Special made outer diameters:
Up to 60”.
Class range:
Class 150, Class 300, 400, 600, 900, 1500, 2500(# or LB). PN 2.5 to PN 250.
Flange face type:
RF (Raised Face), RTJ (Ring Type Joint)
Packaging & Shipping
1. Each layer use plastic film to protect the surface
2. For all stainless steel are packed by plywood case. For bigger size carbon flange are packed by plywood pallet. Or can be customized packing.
3. Shipping mark can make on request
4. Markings on products can be carved or printed. OEM is accepted.

Certifications




FAQ
As one of the leading sorf flange manufacturers and suppliers in China, we warmly welcome you to buy high quality sorf flange made in China here and get pricelist from our factory. For price consultation, contact us.
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