Bi metal clad flanged pipe

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Category: Bimetallic composite pipe Tag: Abrasion-resistant straight pipe

Description

The outer layer of the Bi metal clad flanged pipe is an ordinary steel pipe, and the inner layer is covered with a high-chromium lining formed by centrifugal forming technology. Flanged pipe and fittings are typical components in rigid piping systems. A pipe flange connects piping and components in a piping system by use of bolted connections and gaskets. Most commonly used flanges are weld neck flange, slip on flange, blind flange, socket weld flange, threaded flange and lap joint flange (RTJ Flange).

Features of High chromium cast iron pipes

The late eighty`s, American technology of rare earth wear resistant steel was introduced into our country. The relevant experts researched and made many experiments. The rare-earth wear-resistant steel had occupied the main position.Rare-earth wear-resistant steel is based on 40 steel. Cr, Ni, Si, Mo, Mn, Re elements are mixed in 40 steel forming low alloy steel which carbon content is 0.35~ 0.45%.

Physical Properties of Bi-metal clad pipe

Flexure Strength	Tensile Strength	Elongation	Cross Section Stretch Ratio	Impact Toughness	Hardness of Wearable Layer	Hydrostatic Testing Pressure
MN/㎡	MN/㎡	%	%	J/c㎡	HRC	Mpa
>610	>700	5	5.1	>15	>38	5.6-12.9

Chrome-Moly

Chromium-Molybdenum Alloy Steel or Chrome-Moly, CrMo is an alloy steel intended for high temperature and high pressure services.
Chrome-Moly is used in the power generation industry and the petro-chemical industry because of its tensile strength, corrosion resistance and high-temperature strength.
Chrome-Moly has a better strength to Weight ratio than steel, which enables designers to use thinner wall pipe or smaller diameter tubing to reduce overall weight.
Chromium-Molybdenum Alloy Steel has strong resistance to rupturing at high temperatures and high pressures.
Chrome-Moly is also resistant to cracking from hydrogen attack and hot sulfide corrosion cracking.
Chrome-Moly grades P-11, P-22, P-91 and P-92 are used in the power industry.
Chrome-Moly grades P-5 and P-9 are used in petro-chemical refinery processes.
Chrome-Moly Forged Fittings & Flanges are available in grades F-5, F-9, F-11, F-22, F-91, F92.
Chrome-Moly Alloy Butt Weld Fittings are available in grades WP-5, WP-9, WP-11, WP-22, SP-91, WP-92.
F11 and F22 meet NACE-MRO 175.

Performance indicators

Grade: ZG40CrNiMoMnSiRe
Hardness: HRC ≥ 40
Impact toughness: ≥ 14J/cm2
Tensile strength: ≥ 700MPa

Bimetal wear resistant products including: double metal wear-resisting straight pipe and double metal wear-resisting bend, double metal wear tee, double metal wear resistance reducer adopts the pipe fittings such as vacuum suction casting composite process, its advanced technology, effectively solve the problem of the bent pipe cannot be composite, bending and other various special-shaped pipe can do the whole compound, don’t change the material flow in the pipe bending trajectory, reduce resistance material conveying.

The outer wall of the centrifugal pipe is made of carbon steel, which ensures that the bimetal wear-resistant pipe has high mechanical strength and impact resistance.The inner lining wear resistance layer adopts the anti-wear alloy steel series independently developed by our company. The steel mainly adds alloy such as cr-ni-mo-cu-re and so on. Through the tempering heat treatment process, the alloy steel has strong wear resistance and corrosion resistance, high mechanical strength and impact resistance.
The whole set of process of our factory is the first in China, which fills the blank of anti-corrosion and wear-resistant industrial pipeline in China and has reached the international advanced level. It has been widely used in mining, metallurgy, coal, electric power and other industries, and is an ideal wear-resistant pipeline.

Advantages

The hardness of a good wear resistance superhard wear alloy is greater than 56 (HRC), which has good wear resistance and thermal stability.
Excellent impact resistance, metal binding and thermal shock resistance KMTBCr28 bimetal composite wear-resistant elbow. The joint surface of the two metals is completely metallurgical, safe and reliable. The coefficient of thermal expansion is equal to that of expansion, shrinkage and crack. The outer wall of the elbow is made of steel tube and the inner lining is made of super-hard wear-resistant alloy.
Good resistance to heat and corrosion. The matrix of super hard alloy material has strong resistance to heat and corrosion. Under the action of wet state, corrosion medium and particle scour, it is more suitable to use the super hard wear-resistant alloy. Under the condition of dry state in which abrasive wear is the main failure mode, a kind of super hardness wear-resistant alloy material which can be obtained by heat treatment is selected.
The bimetal wear-resistant pipe with low composite cost and good quality is manufactured by the internationally advanced epc casting process with high yield, good compactness, uniform thickness and stable quality.
The bimetal wear-resistant pipe can be connected by flange, quick joint and direct welding.In addition, due to the high resistance and beating performance of the composite pipe, when partial blockage occurs in the pipe system maintenance, it can be knocked or hammered at will, and can be cut, unloaded, welded and installed at will.

Features of centrifugal casting for bimetal wear resistant pipe production process

(1) centrifugal casting technology enables the molten steel to solidify and form under the gravity condition, which is dozens of times higher than conventional casting. It solves the problem of loose inside the casting tube billet, has high metal density, and has good discharge and exhaust effect.

(2) the size accuracy of centrifugal cast pipe is high and the wall thickness is even, which provides a favorable guarantee for the size accuracy of subsequent processed products.

(3) centrifugal casting process has high flexibility for the production of steel pipes of small batch, multiple varieties and specifications, high quality and high value-added steel.

What is CRA Cladding?

CRA basically means corrosion resistant alloy.
It’s a material that is built for cladding because its main purpose is to enhance a pipe’s resistance to corrosion.

What is Elbow Cladding?

Pipe elbow cladding is the process of applying a cladding material to elbow pipes.
It’s done on a more careful manner than the usual.
This is because elbow pipes can change throughout the entirety of the process.

Where Can Pipe Cladding be Applied to?

Particularly, the process of pipe cladding benefits the oil and gas industry the most.

However, it can also be used by other industries such as:

Mining Industry
Aquamarine Industry
Manufacturing Industry
Fabrication Industry
And Other Industries That Have High Temperature and High Impact

What is Pipe Lining?

Pipe lining is the process of prolonging the lifespan of pipes.

It can also be used, however, to restore a pipe from natural damages such as:

Corrosion
Abrasion
Erosion
Leaks
And the Like

Lined Pipes vs. Clad Pipes

Pipe lining and pipe cladding are processes that are far from each other.

Lining is the process of mechanically bonding materials to pipes for restoration. Some of the uses of pipe lining include:

To protect the pipes from damages
To prolong lifespan of pipes
To restore the original dimensions of pipes

Cladding is the procedure of metallurgical bonding of clad materials to pipes. Some of the major uses of pipe cladding include:

To create abrasion resistant pipes
To prevent corrosion and wear
To be able to resist high temperatures and high stress and impact situations

Who Can Help You With Pipe Cladding?

There are a lot of companies that utilize state-of-the-art pipe cladding equipment.

We have cutting-edge technology that can complete projects ahead of time.

Some of the most notable features that our pipe cladding equipment have include:

Simplicity of use and operations
High automation
Effective water cooling effect
Multi welding torch swing integration
All are of a high quality and original – best to produce the components your business needs!

Application

Because oil and natural gas contains a large amount of corrosive media such as hydrogen sulfide, carbon dioxide and chloride ions, especially the content of corrosive components in the oil and gas medium before pipeline purification in the seabed oil and gas field is high, and some even require heat transfer, and internal corrosion problems are very prominent. The use of stainless steel or corrosion-resistant alloys in large quantities is not economical. Double metal clad pipes are a good choice.

The bimetal clad pipe structure uses a corrosion-resistant alloy tube (stainless steel or corrosion-resistant alloy) as the inner liner (wall thickness 0.5-3mm) to contact the corrosive medium and carbon steel or low-alloy steel as the outer base pipe to withstand the pressure. low. Generally, the double-metal clad pipe contains 316L austenite stainless steel as the inner liner in the case of containing CO2 medium, and 2205 and 2505 duplex stainless steel can be used as the medium containing CO2 + small amount of chloride, when H2S+CO2 is contained. + Chloride, the inner liner should be 028, G3, INCONEL625 and Inconel825 nickel-base or iron-nickel alloy, in order to ensure the corrosion resistance of the pipeline, but also can choose the titanium alloy and other materials with excellent corrosion resistance as lining. The outer layer material is usually API 5L X42, X50, X60, X70, ASTM-A106GB and A335-P22 and other materials, so as to ensure the strength of the pipeline.

Casing pipe for oil and gas transportation

Choosing stainless steel such as Incoloy625 and Incoloy825 for inner tubes to ensure the corrosion resistance of the pipe. The outer pipe are usually X42, X50, X60, X70, A335-P22 and other materials to ensure the strength of the pipeline. The American Petroleum Association (API) has developed the standard for composite pipes for pipelines, with the serial number API 5LD:Cr-Mo steel, super 13Cr, G3, C028 and other oil well tubes and the nickel-base alloy cladding tubes such as 825, 028.

Waste incinerator

Cladding steel tube for waste incinerator.The outer tube can be made of Sanicro65 alloy, and the inner pipe may be carbon steel or chromium, molybdenum steel with resistance to stress corrosion cracking.Europe and the United States have used 2 million meter composite steel pipe since the first installation cladding pipe incinerator superheater and water wall tubes in the 1971.

Heat exchanger

Cladding steel pipe used for heat exchanger should also have good thermal conductivity and a certain strength and corrosion resistance. We manufactured cladding pipe with high alloy, nickel chromium alloy 800 as the inner tube and the low-alloy steel ASTM A213 Ti2 as the outer pipe.

Used for wear-resistant steel

A Japan company have made cladding steel pipe with SUS316L corrosion resistant steel for outer pipe, Stellite No12 alloy for inner pipe,after 4 years is still new. They has also been well applied in the pneumatic conveying pipe of other micro powder particles, and the demand is increasing.

Marine environment

Inner pipe: Nickel, Titanium stainless steel or Copper alloy.
Outer pipe: Carbon steel or low alloy corrosion resistant steel.

Cladding pipe used for marine environment made by Japan’s Kawasaki is widely used as marine heat exchanger tube and seawater desalination of seawater intake pipe.

Civil areas

Cold, hot water pipes, direct drinking water pipes, heating, solar energy, ground source heat pump; civil construction water supply pipes, water distribution trunk; air conditioning circulation pipe, fine decoration high-grade commercial housing water pipes.

Industry

Oil and gas pipeline, oil and gas wells casing, sewage return pipe; chemical heat exchanger tube bundle; power desalination water, desulfurization pipeline and other metallurgy, desalination, medicine and chemical industry, sewage treatment, new energy, food processing and other industries.

Technology

High chromium cast iron is the third generation of white cast iron developed from ordinary white cast iron and hard nickel cast iron.

Process requirement

Wear-resistant elbow is made of bimetal wear-resistant composite.
The general manufacturing method is made by the combination of the vacuum absorption casting process of the vanishing mould, and the manufacturing process of the commodity shall be indicated in other processes.
Adopt composite alloy steel wear-resistant layer, each elbow shall be eccentric compound, and the outside of the elbow shall be thickened according to the working condition to achieve the life design of the outside and inside. In order to reduce the resistance of coal powder transportation, the elbow should be smooth and excessive, and the shrimp waist welding method should not be adopted, so as to ensure that the inner diameter of the throughflow at all parts is 510mm, and no convex platform can be found.
Wear-resistant lining is made of high chromium alloy (not lower than KMTBCr28), with service life over 2 years and annual wear less than 5mm.The outer wear resistant lining thickness is 28mm, the inner wear resistant lining thickness is 22mm, and the hardness of HRC is greater than 55. Outer pipe of lining part 558*10, connecting pipe 508*10, outer ring 558*22, material is 10 steel. Seamless pipes (or welded pipes) can be used, and their performance should meet the requirements of GB2087, GB8163.

The bimetal wear-resistant tube inner wall KMTBCr28 has stable quality and good comprehensive performance. Adding a certain amount of rare earth elements can improve the alloy quality of steel, refine the grain and form a protective film on the surface.A certain amount of Mo was added to make the alloy have certain antioxidant effect and increase service life at high temperature.A certain amount of boron carbide can be added to control the hardness in the range of HRC45 ~ 65, and solve the contradiction between the hardness and weldability of wear-resistant steel.

Quality requirements

The inner and outer surface of bimetal wear-resistant elbow should be smooth and clean, without burrs, burrs, cracks, loose, pores or bubbles;The inner wall of the wear-resisting elbow should be smooth without accumulated powder.The bend should have good thermal shock resistance. When there is a sharp change in temperature or welding connection, the inner layer of the wear-resistant pipe will not break and spalling due to the expansion or contraction of the inner layer.The dimensional deviation shall meet the requirements of product drawings and order, agreement, and shall meet the provisions of GB3092, GB8162 and GB8163 without special requirements.The thickness deviation of lining is + / – 1.2mm.

Grade and chemical composition of high chromium cast iron (%)

Grade	C	Mn	Si	Ni	Cr	Mo	Cu	P	S
KmTBCr12	2.0-3.3	≤2.0	≤1.5	≤2.5	11.0-14.0	≤3.0	≤1.2	≤0.10	≤0.06
KmTBCr15Mo	2.0-3.3	≤2.0	≤1.2	≤2.5	11.0-18.0	≤3.0	≤1.2	≤0.10	≤0.06
KmTBCr20Mo	2.0-3.3	≤2.0	≤1.2	≤2.5	18.0-23.0	≤3.0	≤1.2	≤0.10	≤0.06
KmTBCr26	2.0-3.3	≤2.0	≤1.2	≤2.5	23.0-30.0	≤3.0	≤1.2	≤0.10	≤0.06

High chromium cast iron (containing 12% chromium >) is an excellent wear resistant material.In the research of high chromium cast iron, generally focus on high chromium cast iron such as Cr15, Cr20.With the increase of Cr content and the addition of various alloying elements, the influence on the change properties of the structure was studied.