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Bimetal wear-resistant composite pipe

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bimetal wear resistant composite pipes

The bimetal wear-resistant composite pipe is centrifugally cast, and the inner metal liquid is poured into the inner layer metal when the outer layer metal is basically solidified. Metallurgical bonding, so that the outer metal and the inner metal are fused into a whole.
Bimetal composite pipes can be connected by various methods such as flanges, quick joints, and direct welding. In addition, the bimetallic composite pipe has good impact resistance. If there is a partial blockage, it can be knocked, hammered, cut, replaced, and welded.

Application

Due to its various properties, bimetallic wear-resistant pipes are used in coal and ash (slag) transportation pipelines for thermoelectricity and steel, tailings, slurry and concentrate transportation pipelines for ore concentrators, ore slurry and sediment transportation pipelines for ports, and others There are: various pipes with high corrosion resistance, pipelines for conveying molten aluminum and other pipes with high wear resistance, high corrosion resistance and high temperature resistance.

KmTBCr28

KmTBCr28 has the main elements of Chrome 28%, low Carbon with hardness of 430 in Brinell. KmTBCr28 is a corrosion resistant white iron suitable for low pH corrosion duties, where erosive wear is also a problem.

KmTBCr28: its hardness is 430 in Brinell and suitable for corrosive applications where pH is below 4.

The bimetal wear-resistant pipe is composed of an outer wall and an inner lining. The outer wall is a seamless steel pipe with a thickness of 6-20mm, and the inner lining is a high-chromium-nickel alloy with a thickness of 12-30mm. Casting, this product makes full use of the high pressure bearing capacity, good welding performance and high hardness of high chromium-nickel alloy (HRC30-50) of seamless steel pipe. It is an ideal wear-resistant conveying pipeline.
The outer steel body of the bimetal wear-resistant pipe is made according to the design requirements. The outer arc of the inner wall of the steel needs to be welded and attached to the wear-resistant layer, so that the wear-resistant layer can be firmly attached to the inner wall of the pipe.

Features

KMTBCr28 bimetal wear-resistant elbow has increasingly become a more reliable anti-wear solution for material conveying systems in industries such as electric power, steel, chemical industry, and smelting because of its good wear resistance and reliable welding performance.

1. Wear resistance: hardness HRC>35, with good wear resistance and thermal stability.
2. Impact resistance The joint surface of the two metals is completely metallurgical, and the thermal expansion coefficients of the two are equivalent, and there will be no expansion and contraction cracking.
3. Heat resistance and corrosion resistance: in wet state, under the action of corrosive medium and particle scouring, it is more suitable to use the hardness alloy used in the as-cast state;
4. The product has good compactness, uniform thickness and stable quality.

Technical parameter

Model Φ76-900
Material grade KMTBCr28 (customizable)
Customized according to the picture Straight pipe, elbow, elbow, tee, reducer, etc. can be customized.

KMTBCr28 bimetallic composite wear-resistant pipe came into being and has been widely used since the late 1990s. KMTBCr28 bimetallic composite elbow can not only ensure the requirements of pipeline toughness, weldability and strength (compression resistance), but also ensure sufficient wear resistance. It is an ideal solution for wear-resistant pipelines for material transportation.

KMTBCr28 bimetallic composite elbow can not only ensure the requirements of pipeline toughness, weldability and strength (compression resistance), but also ensure sufficient wear resistance. It is an ideal solution for wear-resistant pipelines for material transportation.

Applicable industries

1. Electric power industry: raw coal system silo, hopper, funnel, powder feeding pipeline.
2. Coal industry: heavy ore coal preparation pipeline in coal preparation plant, wet coal conveying system, sediment backfill in mining.
3. Mining industry: mine filling, concentrate powder transportation, tailings transportation pipeline.
4. Iron and steel industry: coke particle conveying pipeline, coal mill pipeline, separator, elbow, cone, separation baffle.
5. Cement industry: coal powder transportation, mineral powder transportation.
6. Machinery industry: lining of power plant pulverizing, dust removal and ash discharge system equipment, lining of steel mill dust removal equipment.

Metal Slurry Pump Wear Parts Material:

High Chrome Alloy Castings

Chemical composition and grade of high chromium cast iron (bimetallic)

The old brand name of the national standard starts with KmTB, and the new brand name starts with BTM.

Grade and chemical composition of high chromium cast iron:

Grade Chemical composition(%)
C Si Mn Cr Mo Ni Cu S P
BTMCr12-DT 1.1-2.0 ≤1.5 ≤2.0 11.0-14.0 ≤3.0 ≤2.5 ≤1.2 ≤0.06 ≤0.06
BTMCr12-GT 2.0-3.6 ≤1.5 ≤2.0 11.0-14.0 ≤3.0 ≤2.5 ≤1.2 ≤0.06 ≤0.06
BTMCr15 2.0-3.6 ≤1.2 ≤2.0 14.0-18.0 ≤3.0 ≤2.5 ≤1.2 ≤0.06 ≤0.06
BTMCr20 2.0-3.3 ≤1.2 ≤2.0 18.0-23.0 ≤3.0 ≤2.5 ≤1.2 ≤0.06 ≤0.06
BTMCr26 2.0-3.3 ≤1.2 ≤2.0 23.0-30.0 ≤3.0 ≤2.5 ≤1.2 ≤0.06 ≤0.06

Hardness of high chromium cast iron

Grade As-Cast or As-Cast Stress Relief Hardened state or hardened state stress relief Soft annealed state
HRC HBW HRC HBW HRC HBW
BTMCr12-DT — — ≥50 ≥500 ≤41 ≤400
BTMCr12-GT ≥46 ≥450 ≥58 ≥650 ≤41 ≤400
BTMCr15 ≥46 ≥450 ≥58 ≥650 ≤41 ≤400
BTMCr20 ≥46 ≥450 ≥58 ≥650 ≤41 ≤400
BTMCr26 ≥46 ≥450 ≥58 ≥650 ≤41 ≤400

Below are some foreign high chromium cast iron grades and standards

American ASTM A532M:1993

Chemical composition of high chromium cast iron

Grade Chemical compositon(%)
C Mn Si Ni Cr Mo Cu P S
12Cr 2.0-3.3 ≤2.0 ≤1.5 ≤2.5 11.0-14.0 ≤3.0 ≤1.2 ≤0.1 ≤0.06
15Cr-Mo 2.0-3.3 ≤2.0 ≤1.5 ≤2.5 11.0-18.0 ≤3.0 ≤1.2 ≤0.1 ≤0.06
25Cr-Mo 2.0-3.3 ≤2.0 ≤1.0-2.2 ≤2.5 18.0-23.0 ≤3.0 ≤1.2 ≤0.1 ≤0.06
25Cr 2.0-3.3 ≤2.0 ≤1.5 ≤2.5 23.0-30.0 ≤3.0 ≤1.2 ≤0.1 ≤0.06

Hardness of high chromium cast iron

Grade Hardness
Sand casting Chill casting
≥		 Annealing
≤
As cast or as cast + stress relief annealing Quenching or Quenching + Stress Relief Annealing
level 1 level 2
HBW HRC HV HBW HRC HV HBW HRC HV HBW HRC HV HBW HRC HV
12Cr 550 53 600 600 56 660 650 59 715 550 53 600 400 41 430
15Cr-Mo 450 46 485 600 56 660 650 59 715 – – – 400 41 430
25Cr-Mo 450 46 485 600 56 660 650 59 715 – – – 400 41 430
25Cr 450 46 485 600 56 660 650 59 715 – – – 400 41 430

England

Chemical composition of high chromium cast iron

Grade Chemical composition(%)
C Si≤ Mn Cr Mo≤ Ni≤ Cu≤ P≤ S≤
3A 1.8-3.0 1.0 0.5-1.5 14-17 2.5 2.0 2.0 0.10 0.10
3B 3.0-3.6 1.0 0.5-1.5 14-17 3.0 2.0 2.0 0.10 0.10
3C 1.8-3.0 1.0 0.5-1.5 17-22 3.0 2.0 2.0 0.10 0.10
3D 2.0-2.8 1.0 0.5-1.5 22-28 1.5 2.0 2.0 0.10 0.10
3E 2.8-3.5 1.0 0.5-1.5 22-28 1.5 2.0 2.0 0.10 0.10
3F 2.0-2.7 1.0 0.5-1.5 11-13 2.5 2.0 2.0 0.10 0.10
3G 2.7-3.4 1.0 0.5-1.5 11-13 3.0 2.0 2.0 0.10 0.10

Hardness of high chromium cast iron

Grade Cast state Annealed state Heat treatment state
HBW≥ HV50≥ HBW≤ HV50≤(conversion value) HBW≥ HV50≥
3A 450 485 400 428 600 655
3B 500 542 450 485 650 712
3C 450 485 450 485 600 655
3D 400 428 400 428 600 655
3E 450 485 450 485 600 655
3F 450 485 400 428 600 655
3G 450 485 450 485 650 712

Germany

Chemical composition of high chromium cast iron

Grade Chemical compostion(%)
C Si Mn Cr Ni Mo
G-X300CrMO15-3 2.3-3.6 0.2-0.8 0.5-1.0 14-17 0.7 1.0-3.0
G-X300CrMoNi15-2-1 2.3-3.6 0.2-0.8 0.5-1.0 14-17 0.8-1.2 1.8-2.2
G-X260CrMoNI20-2-1 2.3-2.9 0.2-0.8 0.5-1.0 18-22 0.8-1.2 14-2.2
G-X260Cr27 2.3-2.9 0.5-1.5 0.5-1.0 24-28 1.2 1.0
G-X300CrMo27-1 3.0-3.5 0.2-1.0 0.5-1.0 23-28 1.2 1.0-2.0

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