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Cold-rolled steel is made from hot-rolled coils, pickled to remove oxides, and then continuously cold-rolled to produce the finished product.

Cold-rolled sheet is made from hot-rolled coil, rolled at room temperature below the recrystallization temperature.‌ Hot-rolled steel sheet is produced by rolling ingots or continuously cast billets through multiple passes in a rolling mill at high temperatures. 

 Since galvanized round pipes and hot-dip galvanized steel pipes have many similarities, we can understand galvanized round pipes from the differences between them. 

Seamless steel pipes can be divided into several categories according to their material, purpose, production standards, etc. 

Spiral steel pipe is formed from steel coils through room temperature extrusion, then welded using double-wire and double-sided submerged arc welding.

Galvanized square tubes are hollow square steel tubes with a square cross-section. 

Wire rod is the smallest cross-sectional dimension of hot-rolled steel. In my country, hot-rolled round steel supplied in coils with diameters ranging from 5 to 9 mm in eight sizes is generally called wire rod. 

Steel sheet piles refer to steel materials used in bank protection projects, mining projects, and foundation projects of buildings. Steel sheet piles mainly include thin sheet piles, combined support piles, and tubular support piles.

C-shaped steel beams are structural steel with a C-shaped cross-section.