Bimetal composite wear-resistant pipe is the use of advanced composite casting process in the state of the high temperature hot-cast the overall composite, the outer layer of steel pipe, the inner layer of high wear-resistant alloy, performance advantages complement each other, wear resistance and toughness organic combination can be made Into a variety of straight pipe, elbow, tee and other shaped pipe, suitable for a variety of serious wear and tear of dry, wet material transport, can be widely used in mining, electricity, metallurgy, coal, building materials and other industries, is A very cost-effective wear-resistant products.
First, the bimetal composite wear-resistant pipe technical performance characteristics
1, good overall performance
The outer layer of the composite pipe is made of common steel pipe, the inner lining is made of high-chromium wear-resistant alloy, and the two materials form a good combination to solve the contradiction between solderability and wear resistance of a single material which is difficult to blend. Wear resistance, corrosion resistance, but also retains the inherent mechanical properties of ordinary steel, has engaged in erosion and wear resistance and bearing capacity;
2, high wear resistance
Wear-resistant layer of high-chromium alloy material, macroscopic hardness up to HRC55 above, the organization contains a large number of M7C3-type carbide, the micro-hardness HV1500 ~ 1800, which showed excellent abrasion resistance;
3, corrosion resistance
High chromium alloy solid solution with a large number of Cr elements to improve the high temperature oxidation resistance and the electrode potential of the substrate, has good acid and alkali corrosion resistance;
4, the overall composite structure is reasonable
Wear-resistant layer to achieve the overall composite, one-time casting composite molding, smooth inner wall, reducing the resistance of the material transmission process, the material is not easy to sediment deposition;
5, transportation, installation, easy to use
Composite pipe can be flanged, welded and other ways to connect the installation, does not affect the performance of the composite pipe, can withstand the appropriate percussion, hammering, collision, transport without special packaging.
Common four bimetal wear-resistant steel pipe processing technology
At present, the processing of bi-metal composite wear-resistant steel pipe mainly for anti-corrosion, anti-oxidation, to extend the use of time, the following we bimetal composite wear-resistant steel pipe processing technology common four practices are as follows:
First, the gas shielded welding: Under gas protection, the surface of the bimetal composite wear-resistant steel welding of chromium and nickel will not be oxidized, retaining the original characteristics of bimetallic wear-resistant steel pipe and corrosion resistance.
Second, the pickling passivation: pickling passivation can make the inner and outer walls of bimetal composite wear-resistant steel tube to produce a thin and dense, hard passivation film, the existence of passive film is bimetal wear-resistant steel pipe to prevent corrosion of the fundamental the reason.
Third, the sealing material: The sealing material is the key point of the service life of the bimetal composite wear-resistant steel pipe, the service life of the sealing material determines its service life.
Fourth, the bright solid melt: bimetal composite wear-resistant steel pipe after forming, welding process, must be 1050 degrees solid melt treatment to eliminate the bimetallic composite wear-resistant steel tube due to deformation of internal stress, reduce stress corrosion, can be restored Tube during welding changes in the intergranular, the welding heat-sensitive area carbide dissolved in the austenite, to prevent the bimetallic composite wear-resistant steel pipe performance adversely affected.
