Double metals metallurgically-bonded seamless steel pipes is The inner and outer metal are two kinds of steel with different chemical composition through metallurgical fusion, so that the inner and outer layer of metal in the medium part of the mutual melting composite steel pipe.
In the realm of industrial pipelines, the demand for materials with superior mechanical properties and corrosion resistance has driven the innovation of dual metallic metallurgy composite seamless steel pipe. This advanced pipe type combines the benefits of two different metals, creating a synergistic effect that enhances the performance and longevity of pipeline systems. This article elucidates the smelting methods, manufacturing techniques, chemical composition, mechanical properties, and the beneficial effects of using such composite pipes.
1.Smelting Methods:
The production of double metals metallurgically-bonded seamless steel pipes begins with precise smelting processes. Each metal is melted separately using either electric arc furnaces or induction furnaces, depending on the specific metal properties desired. Advanced smelting technologies ensure minimal impurities and precise control over alloying elements, which are critical for achieving optimal performance in the final product.
High quality carbon steel and low alloy steel are refined in EAF. Stainless steel, heat-resistant steel and corrosion-resistant alloys are smelted by off-furnace refining or electroslag remelting.
2.Manufacturing Techniques:
After smelting, the two molten metals are combined using specialized casting processes.
- According to the conditions of use, the inner metal pipe and the outer metal pipe of different materials are selected for surface treatment, respectively, by pickling, shot blasting or polishing.
- The outer surface of the inner layer metal pipe is sprayed with a layer of flux, which is quickly dried after the flux is sprayed and a web oxide is produced.
- The inner metal pipe and the outer metal pipe are inserted and cold-drawn to make the inner metal pipe and the outer metal pipe closely fit.
- The tightly matched inner and outer layer metal tubes are treated with anti-oxidation treatment, and then put into a high temperature furnace for thermal diffusion annealing treatment.
- The double metal tube is cooled in the furnace or by the oven air.
- After the surface treatment of the double-layer metal tube after cooling from the oven, it is cold-drawn into a double metals metallurgically-bonded seamless steel pipes.
The result is a seamless composite pipe with excellent bond strength between the metals.
3.Mechanical Properties:
Double metals metallurgically-bonded seamless steel pipes boast remarkable mechanical properties. They offer high tensile strength, improved impact resistance, and exceptional fatigue life compared to single-material pipes. The combination of metals also provides enhanced wear resistance and can be tailored to suit high-pressure applications. These properties make the composite pipes highly reliable for transporting oil, gas, water, and other industrial fluids under challenging conditions.
4.Beneficial Effects:
The use of double metals metallurgically-bonded seamless steel pipes brings numerous benefits. Their superior mechanical properties reduce the risk of failures and leaks, ensuring the safety of operations and the environment. The enhanced corrosion resistance extends the service life of pipelines, particularly in aggressive media, reducing maintenance costs and downtime. Additionally, these pipes often require thinner walls due to their high strength, resulting in weight savings and increased ease of installation.
5.Conclusion:
Double metals metallurgically-bonded seamless steel pipes represent a significant advancement in pipeline materials. With their sophisticated manufacturing process, tailored chemical composition, and exceptional mechanical properties, they offer unparalleled performance and reliability. As industries continue to seek more efficient and sustainable solutions, these composite pipes are poised to play a critical role in meeting the demands of the future.
Double metals metallurgically-bonded seamless steel pipeshas the characteristics of completely seamless inside and outside the tube, hot extrusion forming, and integrated metallurgical combination of base and cladding.
