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What is the material of CRB550 steel bar?
What are the specifications and dimensions of commonly used cold-rolled ribbed steel bar CRB550?

Answer: The nominal diameter of CRB550 rebar ranges from 4 mm to12 mm. ..

What are different sizes used for?

Usually used for concrete slabs.

And hot rolled ribbed steel bars!

Answer: See the following two tables for the specifications and dimensions of hot-rolled ribbed bars:

It was originally used as steel for reinforced concrete. ?