Carbon steel socket elbow is a kind of high pressure pipe fitting which is made of round steel or steel ingot and then forming it by lathe machine. The material is carbon steel ASTM A105 and the standard is ASME B16.11.
If dividing according to forming it including 45 degree and 90 degree socket elbows.
The size of carbon steel socket elbow generally includes DN6、DN8、DN10、DN15、DN20、DN25、DN32、DN40、DN50、DN65、DN80、DN100 according the standards.DN15 to DN50 are the most used widely. If order the size is over the dimension range, customized drawing processing is available.
The pressure of carbon steel socket elbow refers to 3000BL, 6000BL and 9000BL.

Some specifics of carbon steel socket elbow

1.They are used to transport flammable, toxic or expensive materials in pipelines, do not allow leakage, and 300 to 600 PSI of steam.
2.They work only with ASME pipes and have the same size range.
3.They are used in permanent areas where pipes work and are intended to provide good flow characteristics.
4.They are manufactured according to several ASTM standards and ASME B16.11.The B16.11 standard covers pressure and temperature ratings, dimensions, tolerances, marking and material requirements for forged carbon and alloy steels.The acceptable material forms are forgings, bars, and seamless pipes which meet the chemical, smelting practice and mechanical requirements of ASTM A105.

The advantages and disadvantages of carbon steel socket elbow.

The Advantages of carbon steel socket elbow:

1.Pipes do not need to be tilted for welding preparation.
2.Alignment does not require temporary positioning welding, as the joint is guaranteed to be correctly aligned in principle.
3.The weld metal cannot penetrate the hole in the pipe.
4.They can be used in place of threaded fittings, so the risk of leakage is much lower.
5.Radiography of fillet welds is not practical;Therefore, correct installation and welding are crucial.Fillet welds can be checked by surface inspection, magnetic particle (MP) or liquid penetration (PT) inspection.
6.Due to the lack of strict assembly requirements and the elimination of special processing of butt welding ends, the construction cost is lower than that of butt welding joints.

The Disadvantages of carbon steel socket elbow:

1.Welder shall ensure 1/16 “(1.6mm) clearance between pipe and socket shoulders.
ASME B31.1 segments.127.3 welding preparation (E) sleeve welding assembly:
When assembling the joint prior to welding, the pipe or pipe shall be inserted into the socket to the maximum depth, and then approximately 1/16 inch (1.6 mm) shall be removed from the contact between the end of the pipe and the socket shoulder.
2.Expansion gaps and internal cracks left in socket welding systems can promote corrosion and make them unsuitable for corrosive or radioactive applications where solid accumulation at the joints may cause operational or maintenance problems.Butt welding is usually required in all pipe dimensions and is fully welded into the pipe.
3.For ultra-high static pressure (UHP) in the food industry, socket welds are unacceptable because they do not allow complete penetration and leave very difficult to clean overlaps and cracks, resulting in virtual leaks.

The dimensions of carbon steel socket elbow.
The pressure of carbon steel socket elbow refers to 3000BL, 6000BL and 9000BL. But 3000BL and 6000BL are more popular. Please see the dimension data about carbon steel socket elbow 45 degree and 90 degree 3000BL.

Carbon steel socket elbow 45 degree and 90 degree 6000BL

Carbon steel elbows are resistant to weak erosion media such as air, steam and water and chemical erosion media such as acid, alkali and salt. Also known as stainless acid-resistant steel. In practical application, steel resistant to weak erosion medium is often called stainless steel stamping elbow, while steel resistant to chemical erosion medium is called acid-resistant steel. Because of their differences in chemical composition, the former is not necessarily resistant to chemical erosion, while the latter is generally stainless.

The basic process of Carbon steel 45 degree pipe elbow:

Firstly, a polygonal annular shell with polygonal cross-section or a polygonal fan-shaped shell with closed ends is welded. After the pressure medium is filled, the internal pressure is applied. Under the internal pressure, the cross-section gradually changes from polygonal to circular, and finally becomes a circular annular shell. However, due to the characteristics of single-piece production and low cost, stamping elbow skills are mostly used in the manufacture of small batches and thick-walled elbows. The national standard elbow has hollow section and is widely used as a pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials.

Attribute parameters of Carbon steel 45 degree pipe elbow:

1. Implementation criteria: ASME B16.9, MSS SP-75, EN, DIN, JIS, DL, GD, SH
2. Carbon steel and other materials:
Carbon steel: ASTM/ASME A234 WPB-WPC
Alloys: ASTM/ASME A234 WP1/WP5/WP9/WP11/WP12/WP22/WP91
Stainless steel: ASTM/ASME A403 WP304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low Temperature Steel: ASTM/ASME A402 WPL 3-WPL 6
High Performance Steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
3. Wall thickness: sch10, sch20, sch30, std, sch40, sch60, xs, sch80, sch100, sch120, sch140, sch160, xxs, sch5s, sch20s, sch40s, sch80s. Maximum wall thickness: 150mm
4. Surface treatment: anti-rust black paint, anti-rust varnish, transparent anti-rust oil, hot-dip galvanizing, cold-dip galvanizing, sandblasting, 3PE coating, epoxy coating.
5. Applications: Widely used in electric power, petroleum and natural gas, chemical industry, shipping, heating, paper-making, metallurgy, construction, medicine and other industries.
6. Product quality: It has passed the ISO 9001 international certification, effectively controlled the whole production process, and obtained the special equipment manufacturing license.

Technological characteristics of Carbon steel 45 degree pipe elbow:

Carbon steel elbow forming process uses special elbow pusher, core die and heating device. In order to achieve the billet on the die moving forward under the push of the pusher, it is heated, enlarged and bended in motion. The deformation characteristic of carbon steel elbow is to determine the diameter of tube billet according to the rule that the volume of metal material remains unchanged before and after plastic deformation. The diameter of tube billet used is smaller than the diameter of elbow. The deformation process of billet is controlled by the core die, so that the compressed metal flow in the inner arc can be supplemented to other parts which are thinned due to the expansion of diameter, and thus the diameter of tube billet can be obtained. Carbon steel elbow with uniform wall thickness.

Carbon steel elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, which is suitable for mass production of products. Therefore, it has become the main manufacturing method of carbon steel and alloy steel elbow, and also used in the manufacture of stainless steel elbow of some specifications. The heating methods of forming process include medium frequency or high frequency induction heating (heating ring can be multiple or single loop), flame heating and reflex furnace heating. The heating mode depends on the product requirements and energy conditions.

Application characteristics of Carbon steel 45 degree pipe elbow:

Carbon steel elbow has good temperature and pressure resistance, flexibility and heat resistance, and its performance is higher than other plastic pipes. Easy installation, good thermal conductivity, suitable for floor heating system, recyclability. Stamping elbow pipe has excellent impact strength, which can be welded by hot melt and mechanically connected, and is superior to PB-PP-R in heat conductivity. In terms of design stress, the long-term compressive performance of stamping elbow is the best. However, due to various factors, the actual wall thickness of floor heating pipes is usually 2 mm. Under this wall thickness, all kinds of pipes can meet the requirements of floor heating, and the advantages of pressure resistance of national standard stamping elbow pipe can not be reflected.

Carbon steel elbow has the best compression resistance only in terms of design stress. Due to various factors, the actual wall thickness of floor heating pipes is usually the same, and under this wall thickness, all kinds of pipes can meet the requirements of floor heating, so the advantages of pressure resistance of carbon steel elbow pipes of national standard can not be reflected; thermal conductivity: pipes used for floor heating need good thermal conductivity, low-temperature thermal shock resistance and low-temperature impact resistance. It can be better.

Selection of Professional Manufacturers for Carbon Steel 45-degree pipe elbow

Our company was founded in 1982, and has 36 years of rich production experience. The company has passed international ISO 9001, IOS 14001, ABS, BV and other international certifications. It is a very good brand protection for customers. Over the years, our company has led the technological reform of the industry in the field of France and pipe fittings production, constantly reducing production costs, and striving to provide customers with the best quality and low price products. Carbon steel 45 degree pipe elbow production, not only strict control of raw materials, but also strict monitoring of each production progress, from semi-finished products to finished products.

Buttweld fitting includes long/short radius elbow, concentric reducer, eccentric reducer and tee pipe. Butt weld of stainless steel and carbon steel pipe fittings are necessary parts of industrial pipeline system to change direction, branch or mechanically connect equipment to the system. Buttweld pipe fittings are sold in accordance with the indicated pipe size and specified pipe schedule. Dimensions and tolerances of BW fittings are defined according to ASME standard B16.9.

The advantages of pipeline butt weld pipe fitting:

The main standards for butt welding fittings are ASME B16.9 (carbon and alloy fittings) and MSS SP 43 (integrated ASME B16.9 for stainless steel, biphase and nickel alloy BW fittings).

Butt welding fittings have the following advantages:
1.Strong and leakproof piping connections.
2.Minimize pressure intensity and turbulence in the pipeline.
3.Long service life.
4.It’s cheap to buy and deploy.

Butt weld elbow 45/90/180 degree:

ASME B16.9 butt welded elbows are manufactured in a wide range of sizes (combination of outside diameter and wall thickness) to fit any size of ASME B36.10 and ASME B36.19 carbon, alloy and stainless steel pipes (above) between 2 and 48 inches.

By cutting, heating and bending seamless steel tubes to produce bow elbows less than 24 inches in diameter. Instead, larger elbows are made of welded pipes or steel plates.

The three most common types of elbows in the pipeline are 45 degrees, 90 degrees, and 180 degrees (or elbows), as shown in the figure:

Some special types of elbows are:
Reduced elbow: use a union with two different diameters of inlet and outlet, instead of a combination of standard reduced elbow and concentric reducer.
Mitered elbow: a large elbow assembled by connecting steel plates.

Short and long radius pipeline butt weld elbow:

The distance from the center of the long radius elbow to the end is always 1.5 times the nominal pipe size, while the distance from the center of the short radius elbow is equal to the nominal pipe size.
Example. :
For 4-inch radius (LR) butt welding elbows, distance from center to surface is 4 x 25.4 x 1.5 = 152.4mm;
For short radius butt welding elbows, change the distance from center to surface to 4 x 25.4 x 1 = 101.6mm. Short radius elbows for 90 ° and 180 ° configurations only (not for 45 °); In contrast, a long radius pipe elbow applies to all angles.

Some datas about carbon steel 90 degree elbow

Carbon steel LR 90 degree elbow

LR means long radius R=1.5D, D is the short name of dimension of elbow. Long radius elbow is usually applied to connect two pipes or tubes, which can help to change the direction of fluid in the pipeline. The long radius 90 degree elbow is the most commonly used pipe fitting in the pipeline with high temperature and high flow rate.

Carbon steel SR 90 degree elbow

SR means short radius R=1D which also means the diameter and radius of 90 degree elbow is equivalent. Short radius elbow usually the low pressure pipeline or the places are confined when installed. However, the long radius elbow is preferred if there are no confined conditions or not specified in the contract.

The packaging of pipe elbow

1. Plywood Case and Pallet or according to customers’ requests.

2). For small size fittings from 1/2″ to 11/2″, firstly packing in cartons then put them on plywood pallets.

Delivery period: 10-15 days for LCL, 25-45days for FCL.

Our certificates: ISO9001-2015, BV certificate, OHSAS18001-2007, ISO14001:2015, CE certificate, and ABS certificate.