I. Comparison of Copper Pipes and Stainless Steel Pipes

　　Now, the work is carried out from the aspects of the physical properties, environmental hygiene performance, corrosion resistance and economic development value of the raw materials Comparison.

　　1Physical properties Comparison

　　Compressive strength Comparison:

　　As common304Take the thin-walled stainless steel pipe of the material as an example, its compressive strength is530～750MpaIt is made of galvanized steel pipe2It's made of copper tubes3Double. Therefore, thin-walled stainless steel pipes can be thinner than copper pipes in terms of wall thickness(0.6MM)It conforms to the industrial policy of saving raw materials and ensures compressive strength, which can achieve the purpose of reducing the load of buildings.

　　Heat transfer rate Comparison:

　　The heat transfer ratio of thin-walled stainless steel tubes15W/m℃(100℃)It is made of galvanized steel pipe1/4Copper tube1/23. Thin-walled stainless steel pipes are highly suitable for transporting boiling water due to their excellent heat insulation and preservation performance. Whether it is the thickness of the insulation layer or the construction and maintenance costs of the insulation structure, thin-walled stainless steel pipes often have good rationality.

　　The coefficient of linear expansion Comparison:

　　The mean linear expansion coefficient of thin-walled stainless steel pipes is0.017mm/(m℃),Metal hoses are closer to copper tubes. When transporting boiling water, it is advisable to use them.

　　After the thin-walled stainless steel pipe undergoes inner and outer smoothing treatment, the inner cavity is smooth, and the surface roughness of the inner cavity is reducedKsfor0.00152mmSmaller than copper tubes.

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