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 elbow
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.

Bimetal wear - resistant pipe chemical composition:

Grade C Si Cr Mo Mn Ni S
KMTBCr28 3.00 1.19 27.00 0.25 1.20 0.45 0.06

performance index:

项目 硬度HRC 冲击值(AKJ/cm²) 磨耗量(g/24h) 承压等级(Mpa) 抗拉强度(N/mm²)
指标 ≥80 ≤3 0.0008~0.002 ≤4.0 420

Mechanical property :

Elongation Cross Section
Stretch Ratio
of Wearable
MN/㎡ MN/㎡ % % J/c㎡ HRC Mpa

>610 >700 5 5.1 >15 >38 5.6-12.9
Application Fields of Bi Metal Clad elbow:

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

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.

Inner wall material casting and equipment rendering

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:

Abrasion Resistant Pipe Solutions

Conveying highly abrasive materials, steel piping systems are under constant attack often over long distances.


Because the outer surface behaves like mild steel, the product can be cut and welded with proper procedure in the field, configured into a variety of fittings, and can accept the standard end options of flanges, weld rings and couplings.


We are Quality Department tests and ensures all of our products are 100% inspected unreported. To an offer we customers additional corps of mind, all our products carry a 24-month warranty against defects or faulty workmanship.We fluid-flow products such as pipe and fittings, chokes, orifice plates, etc, carry a warranty against, erosion, defects, and/or faulty workmanship.

The warranty is determined to each creator and the maximum duration maximally in service. Should any of the RS fail within the warranty period, We'll replace or repair the defective product (s) at No. end user. Please contact the Sunny steel for details on the How to obtain a warranty for our products.


As part of our quality regimen, 100% of incoming raw materials, semi-finished products, as well as finished products are thoroughly inspected prior to being entered into our inventory. We have established multiple hold points throughout fabrication as well as a comprehensive final inspection for all products.