KMTBCr28 Bimetal Wear-Resistant Elbow

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.

In order to find a balance between high wear resistance, weldability and impact resistance, KMTBCr28 bimetal composite wear-resistant elbow 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 material characteristics Among alloy materials, the most ideal hardness and wear resistance are high chromium wear-resistant white cast iron and high-quality alloy wear-resistant cast steel (collectively referred to as superhard wear-resistant alloys). The hard phase of high chromium cast iron KMTBCr28 is M7C3 carbide, and its hardness reaches HV1500-1800, so it has good wear resistance, and because the structure of this Ka-type carbide is rod-shaped, it has a high wear resistance. toughness. And on the basis of traditional ingredients, rare metals and boron carbide hardening agents are added, which greatly increases the hardness and fatigue resistance of traditional products, making its wear resistance better than other products.

Heat treatment Usually, the metallographic structure of high chromium cast iron in the as-cast state is: austenite + martensite + carbide + pearlite. In order to develop the full hardness potential and optimum wear resistance of the material while at the same time imparting maximum toughness to the material, heat treatment is required. Usually the austenitizing temperature is about 960-980°C, and the temperature is kept for 2 to 4 hours (depending on the size of the ball). If 0.3-1.0% Cu is added, it must be kept for more than 6 hours to destroy the stability of austenite. Tempering treatment can be carried out in two temperature ranges, and tempering is carried out in the lower temperature range (200-300 ° C), the purpose of which is to temper the martensite obtained in quenching, thereby reducing fracture and Sensitivity to shock. In the state of high-impact abrasive wear, if you want to obtain austenite structure, under the ideal situation of chemical composition control, you only need to perform high-temperature aging treatment once to remove internal stress, which can meet the general needs. Conclusion Practical application and experiments show that it is suitable to produce grinding balls with high chromium cast iron materials, as long as attention is paid to the implementation of casting and heat treatment processes, the selection and control of chemical components, metallographic structure, and the matching of hardness and toughness during the production process, It can give full play to the efficiency of the material and meet the requirements of use.

KMTBCr28 bimetal wear-resistant elbow scope of application

• Electric power industry: Raw coal system silos, hoppers, funnels, powder feeding pipelines.
• Coal industry: Heavy ore coal preparation pipelines in coal preparation plants, wet coal conveying systems, and sand backfilling in mining.
• Mining industry: mine filling, concentrate powder transportation, tailings transportation pipeline. the
  Iron and steel industry: coke particle conveying pipeline, coal mill pipeline, separator, elbow, cone, separation baffle.
• Cement industry: coal powder transportation, ore powder transportation.
• Machinery industry: lining of equipment for milling, dust removal and ash discharge systems in power plants, and lining of dust removal equipment in steel mills.

Performance characteristics of KMTBCr28 bimetal wear-resistant elbow:

1. Good wear resistance
   The hardness of the super-hard wear-resistant alloy is HRC≥56, which has good wear resistance and thermal stability. the
2. Excellent impact resistance, metal bonding performance, thermal shock resistance
   KMTBCr28 bimetal composite wear-resistant elbow, the joint surface of the two metals is completely metallurgical, safe and reliable to use. The thermal expansion coefficients of the two are equivalent, and there will be no expansion, contraction and cracking. The outer wall of the elbow is made of steel pipe, and the inner lining is made of super-hard wear-resistant alloy. This product not only has the wear-resistant and corrosion-resistant properties of high-alloy products, but also has high mechanical properties and high impact resistance. the
3. Good heat resistance and corrosion resistance
   The matrix of superhard alloy materials has strong heat resistance and corrosion resistance, and can show good corrosion resistance and wear resistance in high temperature or corrosive environments. In the wet state, under the interaction of corrosive media and particle erosion, it is more appropriate to use superhard wear-resistant alloys in the as-cast state; while in dry conditions where abrasive wear is the main failure mode, it is more appropriate to use a A superhard and wear-resistant alloy material that can obtain a martensitic matrix through heat treatment. the
4. Low composite cost and good quality
   The wear-resistant elbow is manufactured by the international advanced lost foam casting process, with high yield, good compactness, uniform thickness and stable quality.
5. Easy to transport, install and use.

The bimetal composite wear-resistant pipe can be connected by flanges, quick joints, direct welding, etc. Moreover, due to the high impact resistance of the composite pipe, when a local blockage occurs during the maintenance of the pipeline system, it can be knocked and hammered at will, and can also be cut, removed, and welded at will. The installation and maintenance are very convenient.