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Rare earth metal wear resistant pipe

Rare earth metal wear resistant pipe and Bend 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.


Rare earth alloy wear-resistant pipe Material composition table

No. Grade Chemical component
C Mn Si Cr Ni Mo W V Nb Cu Re N S P
1 ZGCr20Mo3Ni3Re 2.50/
3.0
1.50/
2.0
0.80/
1.20
18.0/
23.0
2.50/
3.0
      1.20/
1.50
  ≤0.06 ≤0.06
2 ZGCr28Mo3Ni3Re 2.80/
3.30
1.50/
2.0
1.80/
1.20
25.0/
300
2.80/
3.30
      1.80/
2.30
  ≤0.06 ≤0.06
3 ZGCr15Mo3Re 2.60/
3.20
1.20/
1.60
1.0/
1.50
12.0/
16.0
2.50/
3.0
      1080/
1.20
  ≤0.04 ≤0.05
4 ZGCr25Ni4Si2Re 0.35/
0.45
0.80/
1.20
1.20/
1.60
23.0/
26.0
3.50/
4.50
          ≤0.035 ≤0.045
5 ZGCr15Mo2Re 1.80/
2.20
0.80/
1.20
1.0/
1.50
14.0/
18.0
2.0/
2.50
      0.80/
1.20
  ≤0.04 ≤0.05
6 ZG40CrMnMoNiSiRe 0.40/
0.50
1.20/
1.60
1.50/
2.0
1.10/
1.60
1.0/
1.50
      ≤0.035 ≤0.04
7 ZG40Cr5Ni3MoVWRe 0.35/
0.45
0.80/
1.2
1.20/
1.60
23.0/
26.0
2.50/
3.50
      ≤0.045 ≤0.055
8 ZG50Cr18Ni4MoVWCuRe 0.45/
0.60
1.0/
1.40
1.50/
2.0
16.0/
20.0
3.50/
5.0
  0.40/
0.60
  ≤0.35 ≤0.35
9 ZGCr25Ni2Mo2WVCuRe 0.40/
0.60
0.80/
1.20
1.20/
1.60
23.0/
26.0
1.50/
2.50
  0.20/
0.40
  ≤0.035 ≤0.035
10 ZG40Cr25Ni6MoWVCuRe 0.35/
0.45
1.2/
1.60
1.50/
2.0
23.0/
26.0
5.0/
7.0
  ≤0.35 ≤0.045
11 ZG90CrMn13MoSiVRe 0.40/
1.30
11.0/
14.0
0.30/
0.80
              ≤0.04 ≤0.04
12 ZGCrMu10MoSiVRe 1.0/
1.20
8.0/
11.0
0.30/
0.80
              ≤0.04 ≤0.04
13 ZGW5Cr4Re 2.50/
3.50
1.5/
1.0
0.50/
1.0
35.0/
4.50
            ≤0.10 ≤0.15
14 ZGCr25MoRe 2.30/
3.0
0.50/
0.90
0.30/
0.60
23.0/
28.0
            ≤0.06 ≤0.10
15 ZGCr15MoRe 3.0/
3.50
≤1.0 0.15/
1.0
15.0/
18.60
  2.80/
3.30
          ≤0.06 ≤0.10
16 ZG30CrMnSi 0.27/
0.33
1.30/
1.50
1.20/
1.50
            ≤0.03 ≤0.04
17 ZG40CrNiRe 0.28/
0.43
1.10/
1.40
0.80/
1.0
            ≤0.06 ≤0.10
18 ZG33Cr13Ni4Re 0.30/
0.35
≤0.80 ≤0.60 12.0/
14.0
4.0/
4.50
          ≤0.06 ≤0.10
19 ZG40CrSiN 0.35/
0.45
1.0/
1.50
1.50/
2.0
              ≤0.04 ≤0.08

Note: All content in this article is for reference only.

  • The wear and tear of rare earth alloy is a phenomenon of material loss caused by relative motion between objects.
  • Rare earth wear-resistant alloy steel tube wear-resistant materials can resist wear and prolong the life of the product.
  • Mainly divided into single metal pipe and composite pipe.
  • According to the shape can be divided into straight pipe, elbow, tee, four-pass, reducer, Fangyuan section and other special-shaped tubes.

What are the materials and uses of the wear-resistant pipe?

Performance indicators:

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

Surface Quality requirements:

the internal and external surface of the pipeline should be smooth and smooth, no burrs, burrs, sticky sand, more meat or lack of meat, no cracks, loose, stomata or bubbles.

According to the different wear conditions, the wear-resistant straight pipe has different material selection.

The function of each material is different, at present there are mainly 4 kinds of materials, including ceramic composite pipe widely used. Materials should be selected according to specific conditions.

According to the pipe material, the wear-resistant tube is divided into the following categories:

SHS ceramic wear-resistant tube (ceramic composite pipe), used in coal washery, thermal power plant ash, steel mills, cement, etc. (the tube is widely used).

  1. Cceramic SMD wear-resistant pipe, used for conveying fly ash.
  2. Surfacing welding wear-resistant pipe, used for sea sand conveying.
  3. Bimetal high chromium alloy wear-resistant pipe, used for power plant pulverized coal.
  4. Ceramic ring wear-resistant tube for the delivery of silica fume.
  5. Rubber wear-resistant pipe, used in concentrator.
  6. Polyethylene wear-resistant pipe for pulp conveying.
  7. Cast-stone wear-resistant pipe for pulverized coal conveying.
  8. Ni-w alloy wear-resistant tube for high-temperature wear and tear transport.
  9. Liner plastic wear-resistant pipe, used for chemical water.

What is the material of the rare earth wear-resistant alloy pipe

The wear and tear of rare earth alloy is a phenomenon of material loss caused by relative motion between objects.

Rare earth wear-resistant alloy steel tube wear-resistant materials can resist wear and prolong the life of the product. Mainly divided into single metal pipe and composite pipe. According to the shape can be divided into straight pipe, elbow, tee, four-pass, reducer, Fangyuan section and other special-shaped tubes.

Surface Quality requirements: the internal and external surface of the pipeline should be smooth and smooth, no burrs, burrs, sticky sand, more meat or lack of meat, no cracks, loose, stomata or bubbles.

Make a variety of irregular shaped pipe fittings to meet the design requirements, straight pipe is centrifugal casting. Second, the rare earth wear-resistant alloy containing CR, Ni, Mo, W, V, Cu and many other alloying elements, it not only has a high hardness, but also has a certain mechanical properties, at room temperature with good welding performance, and has the possibility of cutting and on-site openings, but also has a certain corrosion resistance. In the actual use of the process, whether it is in the steel slag pipe, or in the coal preparation plant, such as the use of washing pipes have achieved very good results, in the same conditions compared with high manganese steel, the unit wear is about 1/5 of the higher manganese steel, the service life is high manganese steel 4-5 times, elbow and branch pipe can be used with seamless pipe fittings, installation, maintenance more convenient.

High strength and low alloy rare earth heat-resisting and wear-resisting steel pipe parts are suitable for coal conveying, powder feeding, ash discharging pipeline and coal preparation plant transportation pipeline in thermal power plant boiler system.


Classification and designation of wear-resistant pipes for power industry

The abrasion pipe of thermal power plant is mainly conveying raw coal powder, ash slag, flue gas desulfurization (FGD) limestone powder and slurry, due to the transmission of medium velocity fast, poor operating conditions, resulting in pipelines, especially elbow, variable diameter pipe serious wear and corrosion, not only consumes a lot of metal materials, but also to the thermal power plant security, economic operation has brought hidden dangers. The abrasion mechanism of pipeline is mainly based on erosion wear.

Wear-resistant pipe can be divided into two categories: single metal pipe and composite pipe.


Application of Abrasion resistant pipe in Dense Medium System

Serious wear and tear of the pipeline not only caused a lot of material waste and media running, running, dripping, leakage, and frequent pipeline maintenance replacement, increasing the labor intensity of workers, increased production costs.

As the medium pipeline is the transmission of high hardness, abrasive strong media suspension, the pressure of the feed cyclone into the tube, in addition to transport media suspension, but also includes coal and gangue. Therefore, compared with the slime mixed pipeline, the media pipe wear speed faster, especially the pressure pipe, such as the cyclone into the material tube, disengage sieve into the material and so on. According to the different materials and flow channels, the general life of the metal pipe material in about a few months to a year or so.

Coal preparation plant site

Many types of Abrasion resistant pipe, pipe diameter needs to be measured on-site

In recent years, wear-resistant technology and the rapid development of wear-resistant materials, Abrasion resistant pipe technology in addition to metal mines, construction, power plants and other areas of application, in the field of heavy media coal preparation has also been widely promoted, greatly improving the heavy pipe Of the service life, reducing the maintenance workload and material consumption, and promote the rapid development of heavy media coal preparation technology.

Commonly used wear-resistant media tube

Common wear-resistant pipe mainly stone pipe, ceramic wear-resistant pipe, alloy wear-resistant pipe. Cast stone is a natural rock as the main raw material, by ingredients, melting, burning, annealing made of an inorganic non-metallic materials. It has excellent wear resistance, corrosion resistance.

China’s metallurgical, thermal power, mining, chemical building materials and other departments are widely used cast stone materials. The main raw material for the production of cast stone is the broadly distributed basalt and diabase, which are basic magmatic rocks, and the chemical composition is relatively stable. Cast pipe than the alloy tube wear, tough, and has a high corrosion resistance, can be resistant to hydrofluoric acid and overheating of any acid and alkali corrosion. But the cast stone tube density is high, brittle, impatient impact, easy to break, the production process is complex, installation and maintenance is not convenient.

Ceramic wear tube is made of self-propagating high temperature synthesis centrifuge. The seamless steel pipe on the centrifuge tube mold, in the steel pipe by adding iron and aluminum powder mixture. This mixture is called aluminum heat in chemistry. Centrifuge tube mold rotation to a certain speed, the Mars ignited aluminum heat agent, aluminum heat agent immediately burn their own, burning quickly spread, and in the spread of a violent chemical reaction, aluminum heat agent after the reaction of corundum and iron, At the same time release a lot of heat, is the original material in the steel pipe and the reaction after the product, even if the melting point of 2045 ° corundum will all melt, because the reaction is very fast, only a few seconds, the molten reactant in the centrifugal force, Size to be separated. Iron is centrifugal force thrown to the inner wall of steel, Al2O3 is distributed in the inner layer of iron. As the steel pipe quickly heat and heat transfer, Al2O3 and Fe quickly reached the freezing point, and soon stratified solidification. The final formation of ceramic wear-resistant tube from the inside out, respectively, corundum ceramic layer, iron-based transition layer, and the external steel pipe layer. High temperature molten iron liquid.

And the Al2O3 liquid, contact with the inner wall of the steel pipe, so that the inner wall of the steel pipe in the semi-molten state, so that the formation of iron and steel pipe metallurgical structure, iron layer and corundum ceramic layer between the liquid formation of a strong combination of its combined strength (that is, Laminated strength)> 15MPa; ceramic wear-resistant tube crushing strength (that is, from the tube outside the tube when the strength of ceramic crushing)> 350MPa.

Applications

Power industry wear-resistant pipe variety, pipe code, use characteristics, application range and nominal diameter see the following table:

Types Wear-resistant pipe code Usage characteristics and application range DN/mm
Low alloy wear-resisting cast steel pipe
(Single metal pipe)
ZG40GrNiMoG Good abrasion resistance, high strength, poor weldability, suitable for pulverized coal and ash pipe DN100-1000
ZG45Cr2MoG Good abrasion resistance, high strength, poor weldability, suitable for pulverized coal and ash pipe
Medium Alloy wear-resisting cast steel pipe
BTMCr30G Good abrasion resistance, high strength, poor weldability, suitable for pulverized coal and ash pipe DN100-1000
ZG42Cr2Si2MnMoG Good abrasion resistance, high strength, poor weldability, suitable for pulverized coal and ash pipe

(Single metal pipe)





BTMCr30G Good abrasion resistance, corrosion resistance, high strength, can not be welded, suitable for corrosion-resistant wear pipeline DN30-1200
BTMCr26G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping DN40-1200
BTMCr20G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping DN100-1000
BTMCr15G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping
BTMCr12G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping
BTMCr8G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping
BTMCr2G Good abrasion resistance, low strength, no soldering, suitable for pulverized coal piping
Anti-abrasion white cast iron
(Bimetal Composite Pipe)





BTMCr30-G Good erosion resistance, high strength, can be welded, suitable for limestone, gypsum, pulverized coal and ash pipe DN30-1200
BTMCr26-G Good abrasion resistance, high strength, can be welded, applicable to pulverized coal and ash pipe, used for slurry, coal slurry conveying DN40-1200
BTMCr20-G Good abrasion resistance, high strength, can be welded, applicable to pulverized coal and ash pipe, used for slurry, coal slurry conveying DN40-1000
BTMCr15-G Good abrasion resistance, high strength, can be welded, suitable for pulverized coal and ash pipe
BTMCr12-G Good abrasion resistance, high strength, can be welded, suitable for pulverized coal and ash pipe
BTMCr8-G Good abrasion resistance, high strength, can be welded, suitable for pulverized coal and ash pipe
BTMCr2-G Good abrasion resistance, high strength, can be welded, suitable for pulverized coal and ash pipe
Inner wall surfacing composite pipe
DNM-IV-G Excellent abrasion resistance, can be welded, suitable for pulverized coal and ash pipe ≥DN200
DNM-V-G Excellent abrasion resistance, can be welded, suitable for pulverized coal and ash pipe
Alumina ceramic composite lined pipe
Aluminum Thermal MethodTR-G
Ceramic Lined composite steel pipe
Wear resistance is very good, high strength, can be welded, easy installation, applicable to pulverized coal and ash pipe, hot air pipe and economizer, hot air pipe, powder conveying, the product cost-effective. DN32-1200
Paste methodTC-G Good abrasion resistance, high strength, can not be welded, suitable for pulverized coal and ash pipe, desulfurization slurry pipe and variable diameter pipe ≥DN200
Rubber composite lined Pipe XS-G Good abrasion resistance, high strength, no welding, suitable for operating temperature -40~100℃ slag pipe DN50-1200
High temperature wear-resisting liner compound pipe WM-G Good wear resistance, high strength, can be welded, suitable for working temperature less than 1800 ℃ dry powder pipe, hot air pipe ≥DN100
Cast stone composite lined pipe ZS-G Good abrasion resistance, low casting strength, high brittleness, can not be welded, applicable to pulverized coal and ash pipe, desulfurization slurry pipe ≥DN40
SIC lined composite pipe SiC-G Good abrasion resistance, can not be welded, suitable for pulverized coal and ash pipe, desulfurization slurry pipe ≤1200

Thermal power plant coal transportation systems, dry ash conveying pipe

Stone in the coal power plant systems

  • coal cleaning plant 
  • Other powder pneumatic conveying system 
  • Hydraulic transmission systems and larger particle size slag slurry transportation

Key performance indicators:

ItemData
Tensile strength:≥700MPa 
Impact toughness:αkJ/ c㎡≥8 
Hardness:HRC≥38 
Grade:ZG40CrNiMoMnSiRe 

Rare earth metal wear resistant pipes have excellent wear resistance, high temperature resistance and corrosion resistance.