Steel Rod

Standards & Specifications of Steel Rod

Our steel rods are manufactured and tested in strict accordance with major international standards. The table below outlines the standards and typical applications for different product types.

Applications of Steel Rods & Round Bars

Our steel rods (wire rods and round bars) are essential raw materials for a vast range of industries. With excellent mechanical properties, surface quality, and machinability, they are widely used in the following applications:

1. Construction & Infrastructure

Reinforced Concrete: Deformed bars (Rebar) are the backbone of high-rise buildings, bridges, and highway construction.

Wire Mesh & Fencing: Low-carbon wire rods are drawn into wires for concrete reinforcement mesh, fencing, and gabions.

Prestressed Concrete: High-carbon wire rods (e.g., 82B) are drawn into high-tensile steel wires used in bridge cables and prestressed concrete structures.

2. Fastener & Hardware Manufacturing

Bolts, Nuts & Screws: Cold-heading quality wire rods (e.g., SAE 1006, 1018) are used to mass-produce fasteners.

Nails & Chains: Low-carbon rods are widely used for making nails, chains, and wire ropes.

Springs: High-carbon and alloy rods (e.g., 65Mn) are used for manufacturing mechanical springs.

3. Automotive & Machinery

Machined Components: Alloy steel bars (e.g., 4140, 42CrMo, 40Cr) are used for turning and milling gears, shafts, axles, and connecting rods.

Hydraulic & Pneumatic Parts: Precision cold-drawn bars are used for making pistons and hydraulic cylinders.

Tooling & Dies: High-quality carbon and alloy bars are used for manufacturing hand tools and dies.

4. Chemical & Marine Industries

Stainless Steel Components: Stainless steel bars (304, 316L) are used to machine valves, pumps, and food processing equipment due to their corrosion resistance.

Offshore Hardware: Stainless and alloy rods are used for marine fittings and structural supports.

Manufacturing Process of Steel Rod

Our steel rods (wire rods and round bars) are manufactured using advanced hot-rolling and cold-drawing technologies to ensure precise dimensions, uniform metallurgical structure, and excellent surface quality.

1. Hot Rolling Process (For Wire Rods & Hot-Rolled Bars)

Billet Heating: High-quality continuous casting billets are heated in a walking-beam reheating furnace to achieve uniform temperature and optimal plasticity.

Roughing & Intermediate Rolling: The billets pass through a series of rolling stands to progressively reduce the cross-section.

Finishing Rolling: High-precision rolls form the final round shape with tight dimensional tolerances.

Controlled Cooling (Stelmor Process): For wire rods, the material passes through a water-box and a Stelmor conveyor for controlled cooling. This process refines the grain structure, eliminates internal stress, and ensures excellent drawability (especially for high-carbon grades like 82B).

Coiling & Cutting: Wire rods are formed into coils (typically 1.5–3.0 tons), while round bars are cut to standard straight lengths (6m, 9m, 12m).

2. Cold Drawing Process (For Precision Bright Bars)

Pickling & Phosphating: The hot-rolled rods are pickled to remove surface scale and coated with phosphate and soap to provide lubrication for drawing.

Cold Drawing: The rods are pulled through a tungsten carbide die at room temperature. This reduces the diameter, improves surface finish, and increases mechanical strength.

Annealing: To relieve work hardening caused by cold drawing, the bars undergo annealing (or spheroidizing annealing) to restore ductility for further machining.

3. Surface Preparation & Finishing

Peeled & Ground (For Precision Shafts): The surface layer (which may contain decarburization) is removed by peeling and then ground to a mirror-like finish, ensuring perfect dimensional accuracy for CNC machining.

Pickled & Oiled (P&O): The surface is acid-pickled to remove scale and oiled to prevent rust during transit.

Q1: What is the difference between Wire Rod and Round Bar?
A: Wire Rods are hot-rolled and supplied in large coils (usually 1.5–3.0 tons), typically with diameters from 5.5 mm to 42 mm. They are ideal for wire drawing, cold heading, and making fasteners. Round Bars are supplied in straight lengths (e.g., 6m or 12m) and are used for machining shafts, gears, and structural components.

Q2: What does "Pickled and Oiled" (P&O) mean, and why is it important?
A: Hot-rolled steel rods have a layer of black oxide scale. Pickling uses acid to remove this scale, and oiling applies a protective layer to prevent rust. P&O surface finishes are essential for cold drawing and precision machining, as the oxide scale would otherwise damage dies and cutting tools.

Q3: What is the difference between SAE 1006 and 82B wire rods?
A: SAE 1006 is a low-carbon steel (approx. 0.06% C) used for nails, wire mesh, and general drawing. 82B is a high-carbon steel (approx. 0.82% C) offering high tensile strength. With our advanced Stelmor controlled cooling process, 82B wire rods offer excellent drawability for manufacturing prestressed concrete wire and steel ropes.

Q4: Can you supply "Bright Bars" for CNC machining?
A: Yes. We supply Peeled and Ground bars (Bright Bars) where the outer surface layer (including any decarburization) is removed. This provides precise dimensional tolerances, a smooth surface finish, and improved machinability for CNC turning of shafts and hydraulic parts.

Q5: Do you offer Spheroidizing Annealing for cold heading?
A: Yes. For fasteners and cold heading applications (e.g., bolts and screws), we offer Spheroidizing Annealing. This heat treatment softens the steel and spheroidizes the carbides, ensuring excellent cold formability without cracking.

Q6: How do you prevent rust during ocean transportation?
A: We apply anti-rust oil, wrap the bundles or coils in waterproof plastic film, and secure them with steel straps. For high-value or long-transit orders, we can also use VCI (Vapor Corrosion Inhibitor) packaging to ensure the rods arrive rust-free.