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Bimetal Clad Pipe

Bimetal Clad Pipe is cast with mold vanishing vacuum suction casting cladding process.

Bi metal clad pipe compared to pure alloy tube cost advantage:

Outer of straight pipe is common steel pipe, cladding realized by forming high chromium lining via centrifugal forming technique.

Bi metal clad pipe Applicable areas

Bi metal clad pipe with high carbon content, impact resistance, low thermal expansion, pressure, high temperature, mature, complete specifications; has many manufacturers of Bi metal clad pipe is widely used in oil, chemical, power and other industrial fields , Its scope of application more and more widely, brought about by the economic, environmental and social benefits are more obvious.

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.

Bi-metal clad pipes are used in mining industry

Bi metal clad pipes are used in thermal power engineering

Bimetallic connection:

Most of the outer tube is used galvanized pipe, followed by a galvanized pipe mature connection:

  1. As shown in Figure 1, threaded connection (commonly known as thread connection), for DN15-DN100, the implementation of GB7306-2 and GB3287-1982 standards;
  2. groove clamp connection, for more than DN100, the implementation of CJ / T156 standard;
  3. flange connection, as the case may be, generally more than DN100, flange and so on by the manufacturers, and in the connection with a dedicated silicone layer;

As shown in Figure 4, welding connection, according to the actual working conditions using welding, the implementation of YB / T5092-2005 and JB / T4747-2002 standard, generally used three-layer welding, the first argon arc welding back cover, re-welding transition layer, the last manual arc Fill the filling surface.

What is Bimetal clad pipe?

Bimetal wear resistant pipe adopts centrifugal casting technology in the production process of straight pipe. This technology is to fuse and shape both metals in liquid state, realizing the purpose of real metallurgical bonding. The shear strength of the binding layer is higher than that of the metal itself, and completely realizes the mechanical complementarity between base layer and wear resistant layer.

Bimetal wear resistant pipe, 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.

Large diameter bimetal bending machining site

Large diameter bimetal bending machining site

Shaped three-way bimetal wear-resistant pipe

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 company 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.


Bimetal wear – resistant pipe advantages:

1. The hardness of a good wear resistance superhard wear alloy is greater than 56 (HRC), which has good wear resistance and thermal stability.

2. 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.

3. 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 superhard wear-resistant alloy.Under the condition of dry state in which abrasive wear is the main failure mode, a kind of superhardness wear-resistant alloy material which can be obtained by heat treatment is selected.

4. 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.

5. 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.

Chemical Composition:
chemical elementCSiMnCrPS其他
content2.0~3.5<1.2<2.015~30<0.1<0.1适量
Mechanical property:
flexure strength
δS’(MN/m2)
Tensile Strength
δb’(MN/m2)
impact toughness
δk’(J/cm2)
Wear hardness
HRC
Hydrostatic test pressure
MPA
>610>415>15>555.6~12.9

Centrifugal casting bimetal wear – resistant pipe equipment

Centrifugal casting bimetal wear – resistant pipe equipment

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.


Characteristics of bi metal clad wear resistant pipe

Inner wall material casting and equipment rendering

1. High abrasion resistance:
the rare earth wear-resistant alloy pipe has been equipped with strong abrasion resistance performance. After the addition of FeV, FeNb and Cu, the metallographic structure of the material has changed again. The grain is more compact, the strength is higher and the plasticity is stronger.

2. Good comprehensive performance:
new rare-earth wear-resistant alloy tube is a new technology using EPC EPC vacuum suction casting, the process can avoid all the casting defects (porosity, slag inclusion, loose, deformation major) material ingredients in the original alloy material: FeCr, FeMn, FeMo, Ni, Re, FeSi, add vanadium iron (FeV), niobium iron (FeNb), copper (Cu), make it has both the wear resistance of high alloy casting materials, and has high mechanical strength and impact performance, at the same time improve the weldability of the material.

3. High temperature resistance:
strong corrosion resistance.The content of Ni and Cr elements in the alloy directly determines the temperature resistance of the material.The content of Cr element and Cu element determines the corrosion resistance of the material. The reasonable combination of these elements enables this new type of rare earth wear-resistant alloy to have several properties at the same time, and can be used under various harsh working conditions.

4. Advanced technology:
stable performance.EPC die – loss vacuum suction casting new technology, mold size precision high, materials uniform structure, performance stability, especially for straight pipe, reducing pipe, unequal thickness pipe, eccentric pipe, cone pipe can achieve integral casting.

5.Low resistance of pipeline system:
the change of metallographic structure makes the matrix grain of casting more compact.The advanced process eradicates the phenomenon of porosity of pores, slag inclusion and structure. The inner wall of the pipeline is smooth like mirror after being transported through a period of time, which greatly reduces the running resistance of the pipeline, improves the service cycle of the pipeline and further improves the wear-resisting property of the material.

6. Convenient installation:
flange, quick joint and direct welding can be used for installation.Due to the addition of FeV, FeNb and Cu, new materials are improved through heat treatment, but at the same time it ensures the random cutting, missing, welding and other installation means of materials.

Application:
  • Power plant coal grinding system
  • The coal pulverizing system
  • Dregs and ash removal system
  • The conveyance pipeline of the heavy media coal washing system
  • The slag conveying pipe of the metallurgical system.
Performance indicators:
  • Grade: ZG40CrNiMoMnSiRe
  • Hardness:HRC≥40
  • Impact toughness :aK≥14J/cm2
  • Strength of extension:oS≥700MPa

Bimetal wear – resistant elbow technology requirements

Process requirement

1. Wear-resistant elbow is made of bimetal wear-resistant composite.
2. The general manufacturing method is made by the combination of the vacuum absorption casting process of the vanishing mold, and the manufacturing process of the commodity shall be indicated in other processes.
3. 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.
4. 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.

Specification requirements:

1. The inlet and outlet of the wear-resistant elbow shall be the straight pipe section with the same wear-resistant material of the elbow. Except special instructions, the length of the straight pipe section imported is 200mm and the length of the straight pipe section exported is 400mm.

2. The connection between wear-resistant elbow and pipe is made by welding.Elbow on interfaces with the transition of materials, the interface transition pipe to Ф 508 x 10 mm in diameter, material of 10 # steel (described in clause 4.1 of the connecting pipe 508 * 10), in order to meet the needs of the field of welding.There should be no special requirement for product field welding to ensure good performance of product welding at ambient temperature.

3. The length of inlet and outlet straight pipe segments of wear-resistant elbow is L1 and L2, which refers to the total length of straight pipe segments, including the length of solderable segment.

Service life requirement:

Service life: ensure that the elbow does not leak during 2 years of operation.Under the premise of guaranteeing the weight of the wear-resistant elbow, the service life of the wear-resistant elbow under the working state shall not be less than 16600 hours.During the service life, make sure the wear-resistant elbow is free of wear and powder leakage.In wear-resisting bend life period abnormal operating conditions, the product should guarantee the high temperature of 350 ℃, lining of wear-resisting layer fracture, peeling off.

Requirement of the surface:

The outer wall shall be painted uniformly and uniformly, and the outer side of the elbow shall be marked with obvious elbow number, Angle, curvature radius and medium flow direction.

Technical parameters:

Pulverized coal pipe diameter  wall thickness: Ф 508 x 10 mm (made of steel no. 10)
Working medium: air powder mixture
Pressure capacity: 0.35MPa
Medium design temperature: 17000Pa
Design of medium pressure: 80 ℃ (maximum 100 ℃)
Medium velocity: 18 ~ 32m/s
Coal fineness: R90 = 20 ~ 22%
Wind coal ratio: 1.3-1.8kg /kg

The production process of bimetal wear – resistant pipe with epc casting process

Epc is also called the real mold casting, will be the same as the casting dimension of foam model after brush refractory materials and drying, buried in the sand dry quartz sand or orb, magnesia olivine sand vibration model, and then under the negative pressure casting, the foam model gasification, liquid metal model position, after cooling solidification form a new type of foundry casting method.Epc technology is praised as “the green revolution of foundry industry”.


Bimetal lined with high chrome alloy pipe

Bimetallic lined with high chrome alloy pipe High chromium alloy material by a special process of a one-time casting shape.

Bimetallic lined with high chrome alloy pipe has the characteristics of anti-wear, corrosion resistance, high temperature resistance and excellent thermal conductivity. It is ideal for pipe fittings with corrosion, erosion and high temperature. It can be used for a long time within 1100 °C, the highest working temperature. At 1200 ° C, the performance is stable and reliable.

High-chromium alloy wear-resistant pipe fittings

  1. High wear resistance: Wear test shows that the wear resistance of composite wear-resistant steel plate is 20 times higher than that of low carbon steel, 5 times higher than stainless steel and high manganese steel, and 1 times higher than cast high chromium iron.
  2. High impact resistance: Due to the use of mild steel substrate, the composite wear-resistant steel plate has high impact resistance, which fully reflects the advantages of the composite material both wear-resistant and impact-resistant. This is beyond the reach of as-cast wear resistant materials.
  3. Convenient processing performance: The composite wear-resistant steel plate can be deformed and welded, and can be easily processed into various wear parts like ordinary steel plates.
  4. High-performance price ratio: Although the unit price is improved by using the composite wear-resistant steel plate, the performance price ratio of the machine is about 2-4 times higher than that of the ordinary material, considering the service life, maintenance cost, and downtime loss of the machine. Due to the rational use of materials, the composite wear-resistant steel plate is 50% lower than the manual surfacing of the same material. The composite wear-resistant steel plate is particularly suitable for surface strengthening of parts that are directly rubbed with sand, ore, dust, cinder, and the like.