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Steel Pipe Elbow

One of the most common methods for manufacturing elbows is using hot mandrel bending from straight steel pipes.
After heating the steel pipe at a elevated temperature, the pipe is pushed, expanded, bended by the inner tools of mandrel step by step.
Applying hot mandrel bending can manufacture a wide size range seamless elbow.
The characteristics of mandrel bending are strongely depend on the intergrated shape and dimensions of the mandrel.

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Product introduction

Seamless Elbow Manufacturing Process (Heat Bending & Cold Bending)
One of the most common methods for manufacturing elbows is using hot mandrel bending from straight steel pipes. After heating the steel pipe at a elevated temperature, the pipe is pushed, expanded, bended by the inner tools of mandrel step by step. Applying hot mandrel bending can manufacture a wide size range seamless elbow. The characteristics of mandrel bending are strongely depend on the intergrated shape and dimensions of the mandrel. The using advantages of hot bending elbows include smaller thickness deviation and stronger bending radius than other bending methond type. Meanwhile, using bending instead of prefabricated bends substantially reduces the number of welds needed. This reduces the amount of work required and increases the quality and usability of pipes. However, cold bending is the process to bent the straight steel pipe at normal temperatures in a bending machine. Cold bending is suitable for pipes with an outer diameter of 17.0 to 219.1 mm, and wall thickness 2.0 to 28.0 mm. The recommended bending radius is 2.5 x Do. Normally at a bending radius of 40D. By using cold bending, we can get small radius elbows, but we need to pack the internals with sand to prevent wrinkling. Cold bending is a quick and inexpensive bending method. It is a competitive option for making pipelines and machine parts.
Welded Elbow Manufacturing Process (Small & Large)
Welded elbows are made from the steel plates, so it is not seamless steel elbows. Use a mould and press the steel plate to the shape of the elbow, then weld the seam to be a finish steel elbow. It is the old production method of the elbows. Recent years the small sizes elbows are almost manufactured from the steel pipes now. For the big size elbows, for example, it is very difficult to produce elbows over 36'' OD from the steel pipes . So it is commonly made from the steel plates, pressing the plate to the shape of half elbow, and welding the two halves together. Since the elbows are welded in its body , the inspection of the welding joint is necessary . Commonly we use the X-Ray inspection as the NDT.

90 Degree and 45 Degree Elbows
Generally, the elbow size designations are either long radius or short radius. The long radius elbow is usually adequate for standard service conditions. For a particular job, the type of elbow selected is usually a compromise based on three considerations. Namely, the material flow rate, space available and initial cost. For service where the flow rate is critical and space is available, the user may select the long radius fittings. This gives him the least reduction in flow and pressure drop from internal friction resestance and stream turbulence. When space is limted and the flow rate is non critical, a short elbow is often selected. When fluids are moved long distances or must encounter many directional changes, short radius elbows are not recommended because of their greater friction loss, which may require installation of larger pumping equipment. A long radius elbow costs less than a short radius fittings. Long radius elbows offer minimum resistance to flow consistent with space savings and persently account for more than 90 percent of all elbows in use.
180 Degree Elbow/Return
The recommended procedure for a 180 degree change in direction is to use a formed 180 degree return fitting rathter than combine two 90 degree elbows or field fabricate a 180 degree pipe bend from a straight pipe piece. Returns are used primarily in heater coils and heat exchangers. The number of coils the space has available determines whether a short or long radius returns is desirable. All long and short 180 degree radius returns have center to center dimensions that are double those of matching 90 degree elbows.

Technical data

BUTT-WELDING PIPE FITTINGS DETAILS
MATERIAL	Carbon Steel :
	ASTM, A234WPB, A234WPC, A420WPL6 ,Q235,10#, A3, Q235A, 20G,16Mn,
	DIN St37, St45.8, St52.4,St.35.8,St.35.8.
	Stainless Steel:
	1Cr18Ni9Ti 0Cr18Ni9 00Cr19Ni10 0Cr17Ni12Mo2Ti
	00Cr17Ni14Mo2 304 304L 316 316L
	Alloy Steel:
	16Mn Cr5Mo 12Cr1MoV 10CrMo910 15CrMo 12Cr2Mo1,
	A335P22 St45.8, ASTM A860 WPHY X42 X52 X60 X70
STANDARD	ASTM / JIS / DIN / BS / GB/GOST
MODEL	1.Tee(Straight and Reducing) 2.180 DEG Return
	3.Elbow (45/90/180 DEG) 4.Cap
	5. Reducer(Concentric and Eccentric)
TYPE	Seam Or Seamless
ELBOW DEGREE	45 degree, 90 degree, 180 degree
SURFACE	Black Paint, Anti Rust Oil, Hot-Dipped Galvanize
WALL THICKNESS	SCH5S,SCH10S,SCH10,SCH20,SCH30,SCH40,STD,XS,SCH60,
	SCH80,SCH100,SCH120,SCH140,SCH160,XXS,2MM
SIZE	1/2"-48"(Dn15-Dn1200)
CONNECTION	Welding
SHAPE	Equal, Reducing
CERTIFICATE	ISO9001
APPLICATION	Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc
RELATED PRODUCTS	1. Carbon steel nipples and sockets	2. Flanges
	3. Malleable iron pipe fittings	4. Pipes
	5. High-pressure fittings	6. Valves
	7. P.T.F.E .thread seal tape	8. Brass fittings
	9. Ductile iron pipe fittings	10. Copper fittings
	11. Sanitary fittings, etc,.	12. Grooved fittings
Customers’ drawings or designs are available.
PACKAGE	1> 1/2" - 2" in cartons.
	2>Above 2" in wooden cases.
	Big size is workable by pallets.
DELIVERY DETAILS	According to the quantities and specifications of each order.
	Normal delivery time is from 30 to 45 days after receiving the deposit.

Steel Pipe Elbow Manufacturing Standards
ASTM A234：Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Hihg Temperature Service
ASTM A403: Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ASME B16.9: Factory Made Wroght Steel Butt Welding Fittings

Steel Pipe Elbow Coating
Along with build quality, the longevity and reliability of steel pipe elbows is highly dependent on the type and quality of the coating used. However, applying coatings to pipe elbows is not just about preventing corrosion, but can affect the evenness of flow through the pipe and the need to prevent contamination of pipe contents ((e.g. foodstuffs or drinking water). GNEE STEEL PIPE offer corrosion resistance coating service for steel pipe elbow, our coating service includes light oiling, black painting, FBE coating, 2 layers or 3 layers PE coating, hot dip galvanizing.

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Factory appearance and appearance

The company mainly engaged in steel production, sales and other businesses. The main products include all kinds of steel plate, steel pipe, bar, profile and other materials and section steel. At the same time is a number of domestic large steel mill level agents, with a certain price advantage.

Packing and delivery

For many years, the company has been established, adhering to the purpose of "respecting contract, keeping faith, customer first, reputation first, quality first", adhering to the customer demand as the center, to "achieve what customers think, think what customers think" business philosophy, to "one sale, small profit, real price, timely delivery" business principle, we manage all kinds of specifications and materials of steel pipe and profile for customers.

Application field

The main supply fields are: aerospace, national defense equipment, military weapons, chemical industry, shipbuilding, nuclear energy, trains, containers, environmental protection, precision machining, auto parts, machinery, electronic products, molds, medical treatment Equipment, construction, decoration, etc.

Customer Visit Feedback

Over the years since its establishment, the company has been adhering to the purpose of "honoring contract, keeping faith, customer first, reputation first, quality first", adhering to the customer demand as the center, to "reach customer think, think customer think" business philosophy.

CERTIFICATE OF HONOR

WELCOME TO INQUIRE

The company guarantees the quality of its products with its strong financial strength, advanced management experience and strict quality control system for incoming goods. Excellent products and good reputation are well-known all over the country, and have won the trust and support of major steel mills and customers. Welcome to inquire, negotiate or visit our company in person. Welcome to inquire, negotiate or visit our company in person.

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FAQ

Q1:Will you offer samples?

A:Yes. We will provide samples according to your needs and send them out within three days after receiving payment.

Q2 : What product information do I need to provide?

A : Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase.

Q3 : It's my first time to import steel products, can you help me with it?

A : Sure,we have agent to arrange the shipment, we will do it together with you.

Q4:Do you have the products in stock?

A:We have the products in stock. Also, we can produce for your order.

Q5:Do you offer after-sales services?

A : Of course. We have a perfect after-sales service system, if you have any questions, please feel free to contact us. We will do it to your satisfaction.

Q6:What kind of work does your company do?

A:Our company is a professional manufacturer. We mainly produce stainless steel plate/coil/round rod, carbon steel plate/coil,galvanized plate/coil, PPGI coil, roofing sheet and so on.

Q7:What are the advantages of your company？

A : We have international advanced production equipment, large factory buildings, strong company strength, perfect products and reliable quality.

Q8 : Are you a factory or trading company?

A : We are a professional steel factory with many years of experience, perfect manufacturing process, quality assurance!

Fittings