Application scenarios of 10# and 20# steel
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For a certain renovation project, there are some pipes at room temperature that are subject to mild corrosion; originally, 10# steel was used for these pipes. Currently, 20# steel is available in the warehouse, and the project team is considering using 20# steel as a substitute for the 10# steel specified in the design. Is this feasible?
Replacing 10# with 20# is feasible; the chemical composition of 20# is similar to that of 10#, and their corrosion resistance differs little. The mechanical properties of 20# are better, making it a higher-grade material in place of a lower-grade one
The performance of 10# must be the worst, right?:lol
This post was last edited by tjsyhx@163.com on 2017-2-7 09:58. I don’t agree with the statements about the second and third floors. The quality of materials is relative; 20# steel has a chemical composition similar to that of 10# steel, and its corrosion resistance is roughly the same. Its mechanical properties are higher, but in terms of performance at low temperatures, 10# steel is superior to 20# steel. Also, when it comes to pipe materials, one should not focus only on the material itself; what’s more important are the applicable standards. If the original pipeline is made of 10# steel per standard 9948, then the one available in the warehouse, which is made of 20# steel per standard 8163 or even from a smaller manufacturer, certainly cannot be used as a substitute.
Agree with the comment above. To be precise, it’s necessary to check what year the 20 in your inventory corresponds to and which standard is being applied ； In which year was that standard applied to the pipeline of device 10?
The original poster used it on pipes at normal temperatures, so low-temperature performance should not be a concern. 10# is specified in GB/T 8163, GB 9948, and GB 6479; the material requirements vary among these different standards. For pipelines at normal temperatures (assuming no corrosion), any of these standards can be used, as steel pipes conforming to the GB/T 8163 standard meet the requirements. Of course, whether it can be replaced actually depends on the medium being used and the specific operating conditions.