Bimetal Wear Resistant Pipe

KMTBCr28 Bimetal Wear-resistant Pipe

A bimetal wear-resistant pipe is designed to resist wear and abrasion caused by the flow of abrasive materials or particles.

Wear-resistant pipes are mainly divided into wear-resistant ceramic pipes, cast stone wear-resistant pipes, cast steel wear-resistant pipes, and pasted wear-resistant pipes. Wear-resistant steel pipes are widely used in industries such as electricity, metallurgy, mining, coal, and chemicals for conveying abrasive materials such as sand, stones, coal powder, ash, aluminum liquid, and corrosive media. Wear-resistant steel pipes, also known as wear-resistant pipes, are made by welding steel plates or steel strips that have been rolled into shape. The production process of wear-resistant pipes is simple, with high production efficiency and a wide range of specifications, requiring less equipment, but their general strength is lower than that of seamless steel pipes.

Since the 1930s, with the rapid development of high-quality strip steel continuous rolling production and advancements in welding and testing technologies, the quality of weld seams has continuously improved. As a result, the variety and specifications of wear-resistant pipes have increased, and they have gradually replaced seamless steel pipes in many fields. Wear-resistant pipes are classified into straight seam welded pipes and spiral welded pipes based on the form of their weld seams.

The translation for the text is as follows:

Rare earth wear-resistant steel, high-chromium cast iron, and other single-metal wear-resistant steel pipes have their hardness directly affecting the welding performance. To ensure normal usage and installation, their hardness needs to be lowered, usually to below HRC40. Despite this, their weldability remains less than ideal, making them prone to cracking during the welding process. In search of a balance between high wear resistance, weldability, and impact resistance, the KMTBCr28 bimetal composite wear-resistant steel pipe was developed and has been widely used since the late 1990s.

The KMTBCr28 bimetal composite steel pipe can meet the requirements for pipeline toughness, weldability, and strength (compressive capability), while ensuring sufficient wear resistance. It is considered a relatively ideal solution for wear-resistant pipelines used for material conveyance.

Performance characteristics:

1. Excellent wear resistance: The super-hardness wear-resistant alloy has a hardness of HRC≥46, providing excellent wear resistance and thermal stability.
2. Outstanding impact resistance, metal bonding, and thermal shock resistance: KMTBCr28 bimetal composite wear-resistant bends have a fully metallurgical bonding between the two metals, ensuring safe and reliable use. The thermal expansion coefficient of both metals is similar, eliminating the risk of expansion and shrinkage cracking. The outer wall of the bend is made of steel, while the inner lining is made of super-hardness wear-resistant alloy. This product combines the wear and corrosion resistance of high-alloy products with high mechanical performance and impact resistance.
3. Good heat resistance and corrosion resistance: The matrix of the super-hard alloy material has strong heat and corrosion resistance, exhibiting good corrosion and wear resistance under high-temperature or corrosive environments. When subjected to the combined effects of wet conditions, corrosive media, and particle abrasion, the use of super-hardness wear-resistant alloy in its cast state is more suitable. In dry working conditions where abrasive wear is the main failure mode, a super-hardness wear-resistant alloy material with a martensitic matrix obtained through heat treatment is selected.
4. Low composite cost and high quality: This wear-resistant pipe is manufactured using an advanced international lost foam casting process, resulting in high yield rates, good density, uniform thickness, and stable quality.
5. Convenient transportation, installation, and usage: Bimetal composite wear-resistant pipes can be connected using flanges, quick couplings, direct welding, and other methods. Moreover, due to the high impact resistance of composite pipes, they are easy to handle during pipeline system maintenance. In case of localized blockage, they can be tapped, hammered, cut, replaced, welded, and installed conveniently for maintenance purposes.

In alloy materials, the most ideal combination of hardness and wear resistance is found in high-chromium wear-resistant white cast iron and high-quality alloy wear-resistant cast steel, collectively known as super-hard wear-resistant alloys. The hard phase of high-chromium cast iron KMTBCr28 is M7C3-type carbide, with a hardness of HV1500~1800, giving it excellent wear resistance. Due to the rod-like structure of this Ka-type carbide, it also possesses relatively high toughness. Additionally, rare metals and boron carbide hardeners are added to the traditional ingredients, significantly increasing the hardness and fatigue resistance, resulting in superior wear resistance compared to other products.

The bimetal composite wear-resistant pipe is manufactured using the lost foam vacuum suction casting process, an internationally advanced metal composite technology belonging to the semi-precision casting category. Compared to sand casting, this process greatly improves surface accuracy and avoids the occurrence of sand inclusion. The use of vacuum casting also eliminates defects like porosity.

Since this process achieves high dimensional precision in mold making, the resulting composite wear-resistant pipes have a uniformly consistent wear-resistant layer thickness. This eliminates the uneven wall thickness issue that often arises from general casting methods during mold release and shaping processes, ensuring uniform structure and stable performance.

Moreover, this technique enables the composite of pipes of any size and diameter, including straight pipes and irregular pipes. It allows for the entire composite of bend pipes, tees, crosses, conical pipes, transition pipes, unequal wall thickness pipes, and eccentric pipes. This reduces operating resistance and lowers the operational costs in material conveyance.

As the inner wall of the bimetal composite wear-resistant pipeline, KMTBCr28 exhibits stable quality and excellent overall performance. The addition of a certain amount of rare earth elements improves the alloy quality of the steel, refining the grain structure and forming a protective film on the surface. The inclusion of a certain amount of Mo provides the alloy with a certain level of oxidation resistance at high temperatures, increasing its service life. Moreover, the addition of a certain amount of boron carbide allows the hardness to be controlled within the range of HRC45 to HRC65, effectively resolving the contradiction between the hardness and weldability of wear-resistant steel, resulting in higher wear resistance.

Wear-resistant pipes, also known as wear-resistant pipe fittings or wear-resistant pipelines, are crucial for conveying materials in various industrial applications. They are often referred to as the lifeline of industries, as they play a vital role in industrial production. Wear-resistant pipes are widely used, from energy and petroleum pipelines to sewage pipelines, and even in coal chemical processes. They are indispensable in various fields, and industrial pipelines can be categorized into two types:

1. Process pipelines: These pipelines directly transport primary materials (mediums) for product manufacturing, also known as material pipelines.
2. Power pipelines: These pipelines transport power media for production equipment.

In summary, wear-resistant pipes are essential components of industrial infrastructure, serving a critical function in the smooth and efficient transportation of materials and power in various industries.