Can GC2 class superheated steam pipes be made of Q235A steel tubes?

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This post was last edited by FMSD on 2015-7-25 at 16:01. Can Q235A steel pipes be used for GC2 class superheated steam pipelines with a working temperature of 280°C? Can welded elbows be used in such pipelines? What are the execution standards for grooved elbows? Does low-pressure superheated steam belong to low-pressure fluids? It seems that in the field of steel structures, there is a notion that manufacturers of Grade A steel do not guarantee a specific carbon content; unstable carbon levels can affect the quality of welding. It also seems that Grade A steel cannot be used in steel structures to bear dynamic loads. Grade A steel is not suitable for welded structures. But pipes are not made of steel structures, let alone load-bearing structures; so there should be no need to worry about the impact of carbon content on welding quality, right?