Bi Metal Clad elbow

 Bi Metal Clad elbow is cast with mold vanishing vacuum suction casting cladding process.

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

Bi Metal Clad flanged elbow

1. Manufacturing Process of Bi Metal Clad elbow:

Bi Metal Clad elbow are cast with mold vanishing vacuum suction casting cladding process. Outer of straight pipe is common steel pipe, cladding realized by forming high chromium lining via centrifugal forming technique. Outer of bend uses hot-bending bend and lining is cast with high-chromium cast iron. Bends and other profile sections can be cladded in whole and this process has changed the traditional practice to fabricate bend and other profile sections by drawing polyline without changing flow pattern of material inside piping,greatly reducing conveyance resistance of material.

2. Advantages Compared with Traditional Wear Resistant

Alloy Cast Iron, Alloy Cast Steel, General Clad Steel Pipe and Cast Stone Pipe:

1. Good wear-resistance, giving full play to wear-resistance of high chromium cast iron.

2. Withstanding high pressure:
Bimetal cladding pipe and bend can be used for any pressure rating. Close bonding of outer and lining by adopting special process make cladding interlayer molten-joint to ensure reliable operation.

3. Good mechanical impact and thermal impact resistance property.

4. Convenient in connection for installation:

Bimetal cladding pipe and bend can be cut and welded as you like.

Application Fields of Bi Metal Clad elbow:

• Paper Making: For conveying pulp.
• Shipping: For clearing shipping channels and sediment transportation.
• Metal Mines: For conveying tailings, concentrates and backfill minerals.
• Coal Preparation Plants: For conveying dense media, mixture and coal slurry.
• Power Plants: For deashing, deslagging, coal dropping, powder transportation

We have a team of experienced professionals with years of experience in manufacturing.

Inner wall material casting and equipment rendering

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.

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.

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