Rare earth alloy wear-resistant pipe is mainly used for electricity, metallurgy, mining and other industries pipeline. Rare earth alloy wear-resistant pipe is widely used in coal-fired power plant to send powder, slag removal, ash transport system, and serious wear and tear mine fill material, mineral powder and tailings delivery system.
Uses: High-strength low-alloy rare earth heat-resistant, wear-resistant steel pipe fittings for coal-fired power plant boiler system, to send powder, ash slag discharge pipe.
Features:
My company and major colleges and universities jointly developed a new series of high-strength rare earth wear-resistant alloy products, it overcomes the material cold, heat, crack, brittle, deformation and other key technology, with high strength, toughness, corrosion resistance, welding performance Good, its technology using the most advanced centrifugal casting, long life, under the same conditions with high manganese steel material, the unit wear is about one-third of high manganese steel, the service life is 3 times higher manganese steel the above. Elbow and branch pipe can be used with seamless steel pipe supporting the use, installation, maintenance more convenient.
The main performance indicators:
Grade: ZG40CrNiMoMnSiRe
Hardness: HRC≥40
Impact toughness: ≥ 14J / cm2
Tensile strength: ≥ 700MPa
Medium-carbon alloy rare earth wear-resistant steel
The material is the eighties of last century by my unit and the North Jiaotong University jointly developed wear-resistant alloy materials, continuous improvement over the years, this series of alloy materials, to meet the power plant conditions of various working conditions.
1, Power plant boiler powder wear elbow, ash ash discharge pipe, after nearly 20 years of use, won the user approval.
2, the material has some other advantages of wear-resistant materials can not be used universally, such as bimetallic materials can not be manufactured power plant coal milling, milling, ash removal, slagging system, some of the equipment accessories. Such as slag scraper, pulverized coal mixer, spiral pipe, etc., can be made of such materials, power plant operation, maintenance and management, bringing great convenience.
3, the composition of the design of carbon multi-alloy system to ensure that the material holding a comprehensive performance index. The material combined with the characteristics of our resources, the use of a small amount of multi-alloy body, the original alloy FeCr, FeMn, Ni, Re, FeSi based on the addition of FeV, FeNb, Cu and other alloying elements to ensure the performance of the product.5, high wear resistance, rare earth wear-resistant alloy steel material has a strong anti-wear properties, joined the FeV, FeNb, Cu material after the microstructure has changed, the microstructure lath martensite + Bainite. More detailed grain, higher strength, more plastic, and the metal matrix further passivation, so that the wear resistance of the original material has been improved.
6, high temperature, corrosion resistance, wear resistance increased. Alloy Ni element, Cr element content directly determines the material's temperature resistance. Cr element, Cu element determines the corrosion resistance of the material, the reasonable composition of these elements make the new rare earth wear-resistant alloy material also has several properties, such as both high wear resistance, but also has a high Corrosion resistance, it can adapt to the use of a variety of harsh working conditions.
7, advanced technology, stable performance, based on the centrifugal casting, resin sand shape, the company introduced EPC lost foam vacuum suction new process according to the product structure, use, use, the number of molding, high dimensional accuracy, uniform material organization, Stable performance, especially for the wear-resistant spiral pipe, pulverized coal mixer, fork pipe, import and export hoppers, days round local joints, cones and other shaped pieces to achieve the overall casting, wall thickness uniform.
8, good welding performance, cutting, and butt welding with mild steel, suitable for a variety of places of operation and construction of the environment, easy installation and use.
9, hardenability is good, because of wear-resistant alloy steel as a table, in the empty quenching conditions, the inner and outer surface hardness HRC difference of 1 to 2, to ensure wear-resistant performance.
10, disadvantages: rare earth wear-resistant alloy steel is the ability of anti-collision low, transport, installation process to be careful.
What rare earth alloy wear-resistant pipe welding?
Rare earth alloy wear-resistant pipe in the field installation can be cut and welded at random, it is very convenient to install. Welding can be used only ordinary J507 electrode, electrode diameter φ4.0mm.
Rare earth alloy wear-resistant pipe welding requirements are as follows:
1, the general use of two welding machine welding.
2, both ends of the bevel welding is completed, with the reinforcement hoop hoop in the middle of the weld, to continue with the outer wall of the composite pipe welding, to ensure the robustness of the weld.
3, should be avoided below 0 ℃ or low temperature humid air outlet welding.
4, welding parts should adopt spot welding, symmetrical welding, and then the overall way of welding, to avoid stress-concentration casting cracking.
5, rare earth alloy wear-resistant pipe To ensure the welding quality, welding surface should be cleaned to avoid oil, slag and other defects.
Rare earth wear-resistant alloy pipe used in coal-fired power plants and steel material differences
Rare earth alloy wear-resistant alloy pipe material for coal-fired power plant ash, slagging pipe, powder, powder tube, desulfurization pipelines. Rare earth wear-resistant alloy pipe with a fast flow, large flow characteristics, the transmission medium continued to produce impact on the wall, wear, corrosion, fatigue caused by the pipeline gradually wear. Rare earth wear-resistant alloy pipe containing Cr, Ni, Mn, Mo, Si, Re and other alloy elements, namely the grade ZG40CrMnMoNiSiRe.
Rare earth wear-resistant alloy pipe not only has high hardness, but also has a certain mechanical properties, good weldability at room temperature, and has the characteristics of cutting and welding, but also has some corrosion resistance.
Rare earth wear-resistant alloy pipe serious wear parts such as elbows, reducers, multi-pass pipe and other solid mold casting, especially in the elbow wear the most serious parts of the outer diameter of the eccentric approach to design so that serious wear and tear Local thickening of the site. And then after heat treatment quenching and tempering and a series of other processes, the wear-resistant properties of rare earth wear-resistant alloy pipe and a big step forward.
Rare earth wear-resistant alloy pipe material can also be used for steel blast furnace coal injection, water and other pipelines. The slag treatment in the slag granulation plant of a steel mill is a circulating water slag system. Rare earth wear-resistant alloy pipe is mainly used to send condensed water slag back to the cooling tower slag pipe, and then sent by the cooling tower granulation tank and condensate water supply slag pipe. Pipe nominal diameter is generally DN150mm-DN900mm between.
According to the steel pipe installation site, rare earth alloy wear-resistant pipe is generally divided into straight pipe, elbow, tee, reducing pipe. As the slag in the S, Fe, fCao high content, poor flow conditions, high dust, iron and iron oxide content is low, that is, the strong corrosive slag. My company for the actual conditions of steel mills, developed a rare earth wear-resistant alloy pipe grades ZG40Cr14Mo1MnNi4WVCuRe. In the original rare earth wear-resistant alloy pipe to Cr, Ni elemental composition increased, but also added W, V, Cu and other corrosion-resistant elements. This rare earth alloy wear-resistant pipe material in the hardness, flexural strength, impact toughness and other mechanical properties have been particularly improved, especially in the anti-corrosion performance is particularly obvious, to solve the steel mill slag conveying pipeline problems, extending the service life .
Rare earth alloy wear-resistant pipe welding need preheating insulation it?
Rare earth alloy wear-resistant pipe not only has strong wear resistance and high hardness, weldable at room temperature can be cut, but also has some corrosion resistance. In the actual use process, compared with high manganese steel under the same conditions, its unit wear is about 1/5 of high manganese steel, the service life is 4-5 times higher manganese steel, pipe, straight pipe, Three links, multi-pass can be used with seamless pipe supporting the use of installation and maintenance more convenient.
Rare earth alloy wear-resistant pipe with two welding at room temperature welding machine does not require heat treatment, such as outdoor operating temperature is too low to be heat treatment, as follows:
- Preheat temperature: 200 ~ 250 ℃
- Preheat method: oxygen - acetylene flame heating
- Interlayer temperature: 200 ~ 250 ℃
- Temperature measurement method: temperature pen
- Other requirements: slow cooling after welding (asbestos cloth)
How to improve the abrasion resistance of rare earth alloy wear-resistant pipe?
Rare earth wear-resistant alloy pipe material with strong anti-wear properties, then choose rare earth alloy wear-resistant pipe wear resistance needs higher, how to improve it?
Material, rare earth alloy wear-resistant pipe has a series of formulations, according to the requirements of wear resistance, choose a different material series. In addition, the appropriate addition of some elements such as FeV, FeNb, Cu material after the microstructure will change, the grain more detailed, higher strength, more plastic, and the metal matrix further passivation, so that the original material resistance Abrasion has been improved, thereby increasing the service life of rare earth alloy wear-resistant pipe.
Structurally, the thickness of the scouring surface of the pipe can be increased or the thickness of the guide block can be increased to increase the wear or flow guide block, thereby increasing the service life of the wear resistant pipe of the rare earth alloy.
Technically, the casting process, mainly heat treatment to change the hardness of rare earth alloy wear-resistant pipe, proper heat treatment can effectively improve the performance of the pipe, pipe hardness changes, making it more wear-resistant.
ZG40GrMnMoNiSiReVCu rare earth alloy wear-resistant pipe What are the purposes?
ZG40GrMnMoNiSiReVCu rare earth alloy wear-resistant pipe, is produced by centrifugal casting pipe.
ZG40GrMnMoNiSiReVCu rare earth alloy wear-resistant pipe in accordance with the use of use can be divided into: power plant coal mill, milling system, slagging, Ash Ash system.
Coal mine heavy medium coal washing system: rare earth alloy wear-resistant pipe is mainly used in conveying pipelines, concentrates and tailings of the pipeline; coal industry in coal-water slurry, coal slime, mine filling material, coal mine heavy medium coal washing pipe, chute Wait;
Mining industry
Metal mine: rare earth alloy wear-resistant pipe is mainly used in the delivery of concentrate and tailings wear-resistant pipe;
Metallurgical system: rare earth alloy wear-resistant pipe is mainly used in the slag delivery pipe, iron and steel plant blast furnace coal injection, slag and other pipeline; CAO, zinc sand conveyor pipe, steel conveying iron alloy, Wear elbow;
Cement plant: Rare earth alloy wear-resistant pipe is mainly used in rotary kiln wet production line raw material slurry conveying, pulverized coal conveying, hoisting machine unloading, finished cement pneumatic conveying loading and unloading, concrete conveying elbow.
Chemical Plant: Rare earth alloy wear-resistant pipe is mainly used in coal conveying pipe, silicon powder and other raw materials to wear elbow.
