Carbon Steel Elbow

Carbon steel elbow is a weldable & threaded pipe fitting that allows for change of flow direction, we manufactured them as standard of ASME B16.9 and B16.11. ASTM A234 WPB Elbow is the common used in the oil and gas industires.

We have supplied our buttweld fittings to major customers which business in Oil & Gas, Chemical & Petrochemical, Water treatment, Nuclear & Power Plant, Offshore platform & Shipbuilding. Our products are applicable for any kinds of severe operating condition such as high pressure and high temperature or cryogenic condition.

Supply Range of Carbon Steel Pipe Elbow

Standard: ASME B16.9, SH3408, HG/T21635, SY/T0510

Size: NPS 1/2″ to 48″ / DN 15 to 1200

Schedule: Sch 20, 40, STD, 80, 160, XXS

Designation: ASTM / ASME A234, A860, A420

Grade: WPB/C, WPHY 42, 46, 52, 60, 65, 70, WPL 3, 6, 9

Type: Seamless Elbow and Weld Elbow

Manufacturing standards and materials

The manufacturing of carbon steel elbows usually follows international and domestic standards to ensure product quality and interchangeability. The most common standards are:

ASME B16.9: This is the most important factory-made butt-weld pipe fittings standard, which specifies the dimensions, tolerances, markings, etc. of elbows.

ASTM A234: Specifies the material specifications for carbon steel and alloy steel seamless and welded pipe fittings for medium and high temperature services. Among them, the most common carbon steel grade is WPB (Welded Pipe Bending). ASTM A234 WPB means that the elbow is made of carbon steel, formed by processes such as welding or pushing, suitable for medium and high temperature services, and has good mechanical properties and weldability.

Carbon Steel Chemical Properties

The common used carbon steel grades are ASTM A234 WPB and A420 WPL6 For low temperature service.

Grade	C	Mn	Si	S	P
A234 WPB	≤0.3	0.29 – 1.06	0.1	≤0.058	≤0.05
A420 WPL6	≤0.3	0.6 – 1.35	0.15 – 0.3	≤0.04	≤0.035

Classification by Angle:

90 degree elbow: Most commonly used, used to achieve a right-angle turn in the pipe.

45 degree elbow: Used to achieve a 45 degree turn in the pipe.

180 degree elbow: Also called a U-shaped elbow or return bend, used to achieve a 180 degree direction change in the pipe, commonly found in heat exchangers and coils.

Other angle elbows: There are also non-standard angle elbows such as 22.5 degrees and 60 degrees, which can be customized according to specific design requirements.

Long Radius Elbow

Fittings that change direction in a piping system are called elbows which available in 90 degree and 45 degree long radius elbow. Both of them has the center line at 1.5 x NPS from elbow end.

Short Radius Elbow

Short radius elbow almost same as above long radius,  the difference is center line to end is 1 x NPS and available in 90 degree only.

Surface of Carbon Steel Elbow

Painting

Firstly, we do the blasting on the body of elbow, to clean the dirt things. Then paint the primer on the inner and outer side. The mainly purpose is against rust during the shipment.

PE Coating

Clean the steel pipe elbow body and wrap the polyethylene tape on it with adhesive. Usually the thickness of coating is 2mm. They are used in the underground pipeline system.

Galvanizing

Take carbon steel buttweld fittings into a bath of molten zinc. That would get more zinc and make the price is high.

We surfaced carbon steel forged fittings with electrogalvanizing because it is pretty and low cost.

Application Areas

Oil and gas industry: Pipelines for oil and gas transportation, refineries and gas processing plants.

Chemical and petrochemical industry: piping systems for the transport of non-corrosive or slightly corrosive chemicals.

Power industry: water, steam and fuel piping in thermal power plants.

Building and civil engineering: Used in a large number of daily piping projects such as water supply and drainage, fire protection systems, heating, ventilation and air conditioning (HVAC).

Marine and Offshore: Piping for ship interiors and offshore installations.