316L stainless steel bars are solid round bars made of low-carbon austenitic stainless steel. They are a major category of high-end anti-corrosion materials, available in hot-rolled, cold-drawn, bright, and precision-ground varieties. The material incorporates molybdenum and uses an ultra-low carbon formula, processed through rolling, cold drawing, polishing, and precision grinding. It possesses superior corrosion resistance, high-temperature resistance, acid and alkali resistance, and easy weldability, with overall performance exceeding that of 304 stainless steel. It is widely used in harsh environments such as highly corrosive conditions, marine applications, chemical plants, and medical settings.

‌Carbon steel flat steel‌ is an alloy steel made of carbon as the main component. It is usually made by hot rolling or cold rolling and has specific mechanical properties and chemical composition. Its cross-section is rectangular with slightly blunt edges, the width is between 12-300mm, and the thickness is between 3-60mm‌
. Carbon steel flat bars are widely used in various structures and projects, such as bridges, buildings, automobile manufacturing, industrial pipelines, etc. In the field of construction, carbon steel flat steel is often used to make steel frames in reinforced concrete structures to improve the seismic performance and wind resistance of buildings‌

Seamless carbon steel square tubes (commonly known as "carbon steel seamless square tubes") refer to hollow square cross-section steel tubes made of carbon steel (such as 20#, Q235B, Q345B, etc.) with no weld seams around the perimeter. They are formed by hot rolling, cold drawing or extrusion into seamless round tubes, combining the economy of carbon steel with the high strength and high reliability of seamless structures.

Cold-rolled carbon steel sheet is a low-carbon steel sheet with a thickness typically ≤4 mm, produced by cold rolling at room temperature (below the recrystallization temperature) from hot-rolled carbon steel coils. It features a smooth surface, high dimensional accuracy, and superior mechanical properties compared to hot-rolled sheets, and is widely used in stamping and forming applications in the automotive, home appliance, and hardware industries.

Galvanized U-shaped steel refers to steel with a U-shaped cross-section that has undergone hot-dip galvanizing or electro-galvanizing treatment. It combines the structural load-bearing capacity of U-shaped steel with the corrosion resistance of the galvanized layer. Based on the manufacturing process, it is mainly divided into two categories: cold-formed galvanized U-shaped steel (commonly used in light-duty construction/photovoltaic applications) and hot-rolled mining U-shaped steel (heavy-duty applications, mining support, less frequently galvanized).

321 stainless steel bars are solid round bars made of titanium-stabilized austenitic stainless steel, mainly categorized as hot-rolled round bars, cold-drawn round bars, bright round bars, and precision-ground round bars. The addition of titanium effectively inhibits intergranular corrosion at high temperatures, resulting in outstanding high-temperature resistance and creep resistance, while retaining the excellent toughness, weldability, and general corrosion resistance of austenitic stainless steel.

Carbon steel hexagonal bars, also known as hexagonal steel, are solid carbon steel profiles with a regular hexagonal cross-section. They are primarily produced using cold-drawing, hot-rolling, and precision grinding processes, and come in three surface finishes: hot-rolled black, cold-drawn bright, and precision ground high-precision. The products are uniformly symmetrical on all six sides, have high dimensional accuracy, and good coaxiality. They also possess excellent cutting, milling, bending, welding, and heat treatment properties, making them a core raw material for manufacturing bolts, nuts, shaft ends, fasteners, mechanical parts, and hardware tools. Their assembly and positioning performance is far superior to that of round or square steel.

Welded carbon steel pipes are steel pipes made from carbon steel (such as Q235, 20#, 45#, etc.). The steel plates or strips are rolled into shape and then welded using processes such as high-frequency welding, submerged arc welding, and electric arc welding to form longitudinal or spiral welds. They are a type of welded steel pipe, and their material is essentially carbon steel.

Hot-rolled carbon steel sheet is made from carbon steel (C ≤ 0.60%) with a predominantly carbon content, produced through heating, rough/finish rolling, and cooling at 1100–1250℃. It has an oxide scale on the surface and lower dimensional accuracy, but good plasticity, high toughness, and low cost. It is commonly used in structural components, vehicle frames, bridges, and other load-bearing applications where surface finish requirements are not high.