Rare earth alloy wear-resistant high chromium cast iron pipe

Rare earth alloy wear-resistant high chromium cast iron pipe under the same conditions as compared with the high manganese steel materials, the unit is a high-manganese steel wear about 1/3, life is more than three times as high manganese steel. Bends and branches seamless steel pipe segment with supporting the use, manufacture applicable irregular pipelines, cutting, welding easy maintenance.

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Category: Rare earth alloy wear-resistant pipe Tags: Abrasion-resistant straight pipe, ZG40CrMnMoNiSiRe

Description

Abrasive wear is a serious form of wear among all kinds of wear, and its essence is the result of the cutting or chiseling action of hard abrasive particles on the metal surface. The abrasive particles penetrate the metal surface to produce plastic deformation and wear scars until the metal surface is abraded. The new high strength low alloy rare earth wear resistant steel pipe is developed according to this principle, and the components are various alloying elements such as Cr, Ni, V, Mo, W, and Cu.

Rare earth alloy wear – resistant tube is badly worn parts, such as pipe, elbow, reducer, and water intake place such as the model of integral casting, then mechanical processing method, especially the outer wear parts, especially in the elbow to the outer diameter change circle method is adopted to carry on the design, local thickening severe wear parts, but also according to various requirements, produce all kinds of irregular switch pipe fittings to meet the design requirements, straight tube is using centrifugal casting.Rare-earth wear-resistant alloy containing Cr, Ni, V, Mo, W, a variety of alloy element such as Cu, it not only has high hardness, but also has certain mechanical properties, at room temperature with good welding performance, and can be cut and the possibility of opening, also has certain corrosion resistance.

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 steels / steeled 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. Rare earth wear-resistant pipe, is in the area of serious wear, such as elbow, reducer, suction nozzle, such as the use of the model as a whole casting, especially in the outside of the elbow wear particularly significant parts, the external diameter of the method to change the center of the design, so that the wear serious parts of the local thickening, but also according to various requirements, 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 alloy 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.

Rare earth alloy wear-resistant pipe material composition table

No.	Grade	C	Mn	Si	Cr	Ni	Mo	W	V	Nb	Cu	Re	S	P
1	ZGCr20Mo3Ni3Re	2.50/3	1.50/2	0.80/1.2	18.0/23	2.50/3	√				1.20/1.5	√	≤0.06	≤0.06
2	ZGCr28Mo3Ni3Re	2.80/3.3	1.50/2	1.80/1.2	25.0/300	2.80/3.3	√				1.80/2.3	√	≤0.06	≤0.06
3	ZGCr15Mo3Re	2.60/3.2	1.20/1.6	1.0/1.5	12.0/16	√	2.50/3				1080/1.2	√	≤0.04	≤0.05
4	ZGCr25Ni4Si2Re	0.35/0.45	0.80/1.2	1.20/1.6	23.0/26	3.50/4.5			√			√	≤0.035	≤0.045
5	ZGCr15Mo2Re	1.80/2.2	0.80/1.2	1.0/1.5	14.0/18	√	2.0/2.5				0.80/1.2	√	≤0.04	≤0.05
6	ZG40CrMnMoNiSiRe	0.40/0.5	1.20/1.6	1.50/2	1.10/1.6	1.0/1.5	√		√		√	√	≤0.035	≤0.04
7	ZG40Cr5Ni3MoVWRe	0.35/0.45	0.80/1.2	1.20/1.6	23.0/26	2.50/3.5	√	√	√			√	≤0.045	≤0.055
8	ZG50Cr18Ni4MoVWCuRe	0.45/0.6	1.0/1.4	1.50/2	16.0/20	3.50/5	√	√	√		0.40/0.6	√	≤0.35	≤0.35
9	ZGCr25Ni2Mo2WVCuRe	0.40/0.6	0.80/1.2	1.20/1.6	23.0/v	1.50/2.5	√	√	√		0.20/0.4	√	≤0.035	≤0.035
10	ZG40Cr25Ni6MoWVCuRe	0.35/0.45	1.2/1.6	1.50/2	23.0/26	5.0/7	√	√	√	√	√	√	≤0.35	≤0.045
11	ZG90CrMn13MoSiVRe	0.40/1.3	11.0/14	0.30/0.8	√		√						≤0.04	≤0.04
12	ZGCrMu10MoSiVRe	1.0/1.2	8.0/11	0.30/0.8	√		√						≤0.04	≤0.04
13	ZGW5Cr4Re	2.50/3.5	1.5/1	0.50/1	35.0/4.5	√						√	≤0.10	≤0.15
14	ZGCr25MoRe	2.30/3	0.50/0.9	0.30/0.6	23.0/28	√						√	≤0.06	≤0.10
15	ZGCr15MoRe	3.0/3.5	≤1.0	0.15/1	15.0/18.6		2.80/3.3					√	≤0.06	≤0.10
16	ZG30CrMnSi	0.27/0.33	1.30/1.5	1.20/1.5	√		√					√	≤0.03	≤0.04
17	ZG40CrNiRe	0.28/0.43	1.10/1.4	0.80/1	√		√					√	≤0.06	≤0.10
18	ZG33Cr13Ni4Re	0.30/0.35	≤0.80	≤0.60	12.0/14	4.0/4.5	√					√	≤0.06	≤0.10
19	ZG40CrSiN	0.35/0.45	1.0/1.5	1.50/2	√		√						≤0.04	≤0.08

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

Property of rare earth alloy wear-resistant tube

No.：ZG40CrNiMoMnSiRe
Hardness：HTC≥40

temperature ℃	Abrasive wearmg/g	hardness HRC	Tensile strengthN/mm²	Impact toughness J/cm²
≤300	0.021	≥63	890	5
≤350	0.033	≥56	910	6
≤350	0.042	≥45	910	6
≤400	0.069	≥42	960	6
≤400	0.039	≥48	920	7
≤400	0.064	≥40	950	7
≤400	0.069	≥36	910	8
≤400	0.036	≥42	1040	8.5-10

Features

Rare earth alloy wear-resistant pipe is used for pneumatic, pumping slurry and other material conveying pipes. It has the characteristics of fast flow rate and large flow rate.

Abrasion resistance

Compared with high manganese steel materials under the same conditions, the unit wear of rare earth alloy is about 1/3 that of high manganese steel, and its service life is 2-3 times that of high manganese steel.

Strong corrosion resistance, high temperature, high wear resistance

Because R alpha composition and structure characteristics of carbide , and the content of solid solution to Cr matrix has strong heat resistance, corrosion resistance, and add the Mo in the high temperature or corrosive environment shows the performance of corrosion resistance, abrasion resistance, add a certain amount of rare earths, giving the inner structure of the alloy is more compact, surface to form a layer of protective film, prevent seepage of carbon. Increased wear resistance, corrosion resistance; Containing a certain amount of boron makes the alloy hardness , which can not was achieved by carburizing. At the same time, containing a certain amount of Mn increases the fatigue resistance of the alloy , so that the wear resistance of the alloy is better than that of high chromium alloy and rare earth alloy.

More convenient installation and maintenance

Rare earth wear resistant alloy pipe, metal wear resistant pipe, high hardness, heat treatment pipe arbitrary cutting, unloading, installation, maintenance, very convenient.
Elbow and branch pipe can be used together with the seamless steel pipe section, flange connection pipe is more reliable, easy to disassemble.
Good welding performance, can be cut, butt-welded with low carbon steel, suitable for operation and construction in various places and environments.

Alloy cast pipe has high pressure resistance

Alloy wear-resistant casting pipe can bear the pressure of 6 ㎏ / cm2, can be applied to gas conveying high pressure pipeline, for external use high-quality steel pipe or is made of high qualified steel plate, hot pressing push system, through the good welding, makes the elbow in more than 10 kg/cm2 pressure is no problem, won’t appear because of local air leakage, diversion phenomenon of material.

Advantages that other wear-resistant materials

Such as bimetallic materials can not be manufactured in the power plant coal grinding, pulverizing, ash removal, slag discharge system of some equipment accessories. Such as dredge scraper, pulverized coal mixer, spiral tube, etc., can be made of this material, which brings great convenience to power plant operation, maintenance and management.

Advanced technology and stable performance

On the basis of centrifugal casting and resin sand molding, the company introduced a new EPC lost foam vacuum suction casting process to make molds according to product structure, application, usage method and quantity, with high dimensional accuracy, uniform material organization and stable performance, especially for wear-resistant Spiral pipes, pulverized coal mixers, fork pipes, import and export hoppers, round and round joints, cone buckets and other special-shaped parts are cast as a whole, and the wall thickness is uniform.

Disadvantages

The disadvantage of rare earth wear-resistant alloy steel is its low impact resistance, so it should be carefully handled during transportation and installation.

Material

Grade: ZG40CrNiMoMnSiRe
Hardness: HRC≥40
Impact toughness: αK≥14J/cm2
Tensile strength: αB≥700MPa
Service life: 4-5 times that of ordinary carbon steel and 2-3 times that of cast stone elbows.

Rare earth alloy material ZG40CrMnMONiRe chemical composition (%)

Grade	C	Cr	Mn	Mo	Ni	Si	S	P	Re
ZG40CrMnMONiRe (JM6a)	0.35-0.42	1-1.14	1-1.14	0.3-0.6	0.5-0.8	0.8-1.2	≤0.04	≤0.04	≤0.02

The composition, design of medium carbon alloy, rare earth wear-resistant steel adopts medium carbon multi-alloy system to ensure that the material maintains comprehensive performance indicators. Combining the characteristics of our country's resources, this material adopts a small amount of multi-element alloy body, and adds FeV, FeNb, Cu and other multi-alloy elements on the basis of the original alloy materials FeCr, FeMn, Ni, Re, FeSi, etc., to ensure the performance of the product.

Rare earth alloy material ZG40CrMnMONiRe mechanical properties

The mechanical properties adopt perfect testing methods to ensure the stability of material properties.

Grade	Tensile strength σb MPa	Impact ak j/cm2	Hardness HRC
ZG40CrMnMoNiRe(JM6a)	≥860	30	≥40

What is ZG40Cr8MnMoNiSiRe?

ZG40Cr8MnMoNiSiRe is the latest rare earth alloy wear-resistant material developed by our factory on the basis of the original rare earth alloy. By increasing the content of Cr in the rare earth alloy, the wear resistance of the rare earth alloy is greatly increased. ZG40Cr8MnMoNiSiRe now is instead of ZG40CrMnMoNiSiRe to produce rare earth metal wear resistant pipe and fittings.

Application

Rare earth alloy wear-resistant pipe is used for conveying wear-resistant pipes such as power plant powder and ash, mine slag and non-ferrous metal coal extraction and slag discharge, shock resistance and wear resistance.

The application fields of rare earth alloy wear-resistant pipes are as follows:

Coal-fired power plant
Coal conveying, ash removal, slag discharge pipes, powder feeding, powder returning pipes, desulfurization pipes, etc.;

Mine:
In the coal industry, coal-water slurry, coal washing slime, mine filling material, mine pulverized heavy medium coal washing pipeline, chute, etc.;

Metal Mine:
Conveying wear-resistant pipes for concentrates and tailings;

Metallurgy:

Blast furnace coal injection and slag conveying pipes in iron and steel plants; CAO, zinc and sand conveying pipes, iron alloy conveying in steel making, out-of-furnace refining and other preferred wear-resistant pipes;

Cement plant:
Raw slurry transportation, pulverized coal transportation, hoist unloading, finished cement pneumatic transportation loading and unloading, concrete transportation pipeline of rotary kiln wet production line.

Chemical plant:
Coal powder conveying pipeline, silicon powder and other raw material conveying wear-resistant elbows.

The composition design of medium carbon alloy rare earth wear-resistant steel adopts medium carbon multi-alloy system to ensure that the material maintains comprehensive performance indicators. Combining the characteristics of our country’s resources, this material adopts a small amount of multi-element alloy body, and adds FeV, FeNb, Cu and other multi-alloy elements on the basis of the original alloy materials FeCr, FeMn, Ni, Re, FeSi, etc., to ensure the performance of the product.

The medium carbon alloy rare earth wear-resistant steel has high wear resistance, and the rare earth wear-resistant alloy steel has strong wear resistance. After adding FeV, FeNb, and Cu, the metallographic structure of the material has changed. The metallographic structure is: Lath Martensite + Bainite. The grains are finer, the strength is higher, the plasticity is stronger, and the metal matrix is further passivated, so that the wear resistance of the original material has been improved.

Medium carbon alloy rare earth wear-resistant steel has high temperature resistance, strong corrosion resistance and improved wear resistance. The content of Ni and Cr elements in the alloy directly determines the temperature resistance of the material. The content of Cr element and Cu element determines the corrosion resistance of the material. The reasonable combination of these elements makes the new rare earth wear-resistant alloy material have several properties at the same time, such as high wear resistance and high wear resistance. It has excellent corrosion resistance, so it can adapt to the use of various harsh working conditions.

The medium carbon alloy rare earth wear-resistant steel has advanced technology and stable performance. On the basis of centrifugal casting and resin sand molding, our factory has introduced a new EPC lost foam vacuum suction casting process to make molds according to product structure, application, use method, and quantity. High precision, uniform material structure and stable performance, especially for special-shaped parts such as wear-resistant spiral pipes, pulverized coal mixers, fork pipes, import and export hoppers, round and round joints, cone buckets, etc., the wall thickness is uniform.

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