What is KMTBCr26?

KmTBCr26 is a high-chromium anti-wear white cast iron with high carbon content, chromium as the main alloying element, and excellent performance.

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.

Chemical composition of GB-KmTBCr26

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Mo(%) Ni(%) Cu(%)
2.3-3.0 ≦1.0 0.5-1.0 ≦0.1 ≦0.06 23.0-28.0 0.0-1.0 0.0-1.5 0.0-2.0


  • Abrsion Resisting Cast lron Low Alloy and High Alloy Grade

Country Code

  • GB


  • 8263

Steel Type

  • KmTBCr26

What is a bimetal composite wear-resistant pipe?

The outer wall of the bimetal composite wear-resistant pipe is made of ordinary seamless steel pipe, which is compounded by a high-chromium cast steel lining through a centrifugal forming process. The outer wall of the elbow is made of shrimp elbows, and the inner layer is made of high-chromium cast steel, which not only has the wear resistance of high-alloy cast steel, but also can withstand pressure, and has higher mechanical properties.

Bimetal wear-resistant pipeline characteristics:

1. Good wear resistance   the hardness of super-hard wear-resistant alloy HRC≥46, with good wear resistance and thermal stability.
2. Excellent impact resistance, metal bonding performance, thermal shock resistance  KMTBCr28 bimetal composite wear-resistant elbow, the bonding surface of the two metals is completely metallurgical, and it is safe and reliable to use. The thermal expansion coefficients of the two are equivalent, and there will be no expansion and contraction. 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 characteristics of high-alloy products, but also has higher mechanical properties and higher impact resistance.
3. Good heat resistance and corrosion resistance. The matrix of super hard alloy material has strong heat resistance and corrosion resistance, and can show good corrosion resistance and wear resistance under high temperature or corrosive environment. Under the interaction of wet state, corrosive media and particle erosion, it is more appropriate to use super-hard wear-resistant alloys used in as-cast state; and under dry conditions where abrasive wear is the main failure mode, use a A super-hard and wear-resistant alloy material that can obtain a martensite matrix through heat treatment.
4. Low composite cost and good quality   The wear-resistant tube is manufactured using international advanced lost foam casting technology, with high yield, good product compactness, uniform thickness and stable quality.
5. Convenient transportation, installation and use   The bimetal composite wear-resistant pipe can be connected by flange, quick joint, direct welding and other methods. Moreover, due to the high impact resistance of the composite pipe, when a partial blockage occurs during the maintenance of the pipeline system, it can be knocked, hammered, or cut, removed, welded, installed and repaired at will.