Production Process

Steel Rebar (reinforcing bar) is a ribbed steel bar used to strengthen concrete in construction. It provides tensile strength to structures like buildings, bridges, and roads, preventing cracks and failures.

Grades and Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Common Standards
Grade 40	280	420	≥10	ASTM A615, BS 4449
Grade 60	420	620	≥12	ASTM A615, GB/T 1499.2
Grade 75	520	690	≥10	ASTM A615
Grade 500	500	650	≥14	BS 4449, ISO 6935-2
Grade 550	550	700	≥12	BS 4449, ISO 6935-2

Chemical Composition of Common Rebar Grades

Element	Carbon Steel (%)	Low-Alloy Steel (%)	Stainless Steel (%)
Carbon (C)	0.15 - 0.30	0.15 - 0.30	≤ 0.08
Manganese (Mn)	0.60 - 1.65	0.60 - 1.65	≤ 2.00
Silicon (Si)	0.15 - 0.30	0.15 - 0.30	≤ 1.00
Chromium (Cr)	-	≤ 0.30	16.0 - 18.0
Nickel (Ni)	-	≤ 0.30	8.0 - 10.0
Sulfur (S)	≤ 0.05	≤ 0.05	≤ 0.03
Phosphorus (P)	≤ 0.05	≤ 0.05	≤ 0.045

Common Diameters and Uses

Diameter (mm)	Common Uses
6 mm	Thin slabs, small beams, light-duty walls.
8 mm	Light reinforcement for slabs, beams, and walls.
10 mm	Medium reinforcement for residential buildings.
12 mm	Beams, columns, and slabs in residential and commercial buildings.
16 mm	Heavy reinforcement for beams, columns, and foundations.
20 mm	Large beams, columns, and heavy-duty slabs.
25 mm	Bridges, dams, and large-scale infrastructure.
32 mm	High-stress applications in mega-structures.
40 mm	Skyscrapers, nuclear power plants, and specialized heavy-duty projects.
50 mm	Extreme heavy-duty applications like large dams and offshore structures.

Packing of Deformed Bar

Bundling	Bars of the same diameter, grade, and length are grouped together. Bundles are tightly secured using steel straps or wires to prevent movement during transit.
Bundle Weight	Standard bundle weights range from 2 to 5 tons, depending on the bar diameter and length. Smaller diameter bars (e.g., 6 mm to 12 mm) are bundled in lighter weights. Larger diameter bars (e.g., 25 mm to 50 mm) are bundled in heavier weights.
Bundle Dimensions	The length of the bars in a bundle is typically 12 meters (standard length). - Custom lengths can be provided based on project requirements. The diameter of the bundle depends on the number of bars and their size.
Identification and Labeling	Each bundle is labeled with: - Manufacturer's name or logo. - Bar size (diameter). - Grade (e.g., Grade 40, Grade 60). - Length and weight of the bundle. - Heat number or batch number for traceability.
Protective Measures	- Bars are often coated with a light oil or rust inhibitor to prevent rust and corrosion. - Epoxy-coated or galvanized bars are packaged separately to avoid damage to the coating.

Application

Application Areas	Specific Uses
Building Structures	- Reinforcement for concrete components (beams, slabs, columns, walls) - Seismic stirrups and longitudinal bars configuration - Pile foundation reinforcement cages
Infrastructure	- Railway sleepers, bridge supports - Dams, reservoir reinforcements - Underground pipeline brackets, sewage treatment plant tank reinforcements
Special Structures	- Nuclear power plant shells, chemical reactor vessels - Stadium/airport long-span steel cable trusses - Marine engineering corrosion-resistant steel (epoxy coating)
Precast Components	- Reinforcement for precast walls, floors, stairs - Prestressed steel bars for bridge/crane beam tension structures
Other Applications	- Welded steel mesh for protective fences - Scaffolding/formwork connectors

FAQ

Q: What is a Deformed Bar?

A: A deformed bar, also known as rebar, is a steel bar with ribs, lugs, or patterns on its surface. It is primarily used to reinforce concrete structures. The deformations enhance the bond between the steel and concrete, improving the overall strength and durability of the structure. Deformed bars are widely used in buildings, bridges, roads, and other construction projects.

Q: What is the main material?

A: The main material of deformed bars is carbon steel, with common grades such as Q235 and Q355. Additionally, there are special materials like low-alloy steel, stainless steel, and galvanized steel to meet different environmental and project requirements. For example, stainless steel rebars are used in highly corrosive environments, while galvanized rebars are suitable for moderately corrosive conditions.