Seamless pipe is very expensive, and is only used in certain applications, such as steam condensate return, where ERW (seamed) pipe would not last as long. For a handrail, go with the ERW.
In order to connect a chromed steel pipe to a copper pipe, you will need a brass fitting. These two pipes will not fit into each other otherwise.
what is a type B handrail
It will connect to the PVC pipe into the wall which ultimately will connect into the main sewer line outside.
The best way to connect two sections of PVC pipe with a 2 inch PVC coupling is to first clean and dry the pipe ends, apply PVC primer and cement to the ends and inside the coupling, then quickly push the pipe ends into the coupling and hold them in place for a few seconds to allow the cement to bond.
No! That will create intergranular corrosion
In plumbing it is a pipe connector that also reduces the size of the pipe so two different sizes can be spliced. If you want to connect a 1" pipe to a 3/4" you would put a 1' to3/4" reducer there.
NO but you will need some type of sealent OR braze or soldering
To install a handrail on concrete steps, you will need to drill holes into the concrete, insert anchor bolts, and secure the handrail brackets to the bolts. Then, attach the handrail to the brackets using screws or bolts. Make sure to use a level to ensure the handrail is straight and secure.
Yes
To connect PEX pipe to copper in a plumbing system, you can use a push-to-connect fitting or a compression fitting specifically designed for this purpose. These fittings allow for a secure and watertight connection between the two types of pipes. Make sure to follow the manufacturer's instructions carefully for proper installation.
If the copper is big enough, you can treat it as if it were cast and use packing and sealant. If the diameters are too different, you can use a rubber coupling to connect the two.