conveyor_belt // MANUFACTURING PROCESS

From Wire Rod to
Finished, Tested Product

A controlled, inspection-driven process — from raw material receipt through drawing, heat treatment, section rolling, centerless grinding and dispatch.

01

Raw Material Receipt, Storage & Identification

Raw material from approved steel mills is stored in the raw material stockyard. Every wire rod coil is identified through labels with stock code numbers, logged against every purchase receipt by grade and size.

Raw Material Receipt, Storage & Identification at 4BH Steel Wires & Bars
02

Raw Material Incoming Inspection

Chemical testing for carbon composition, macro examination for surface defects (pitmarks, seams, cracks, ribs, rust) and micro examination for decarburization depth on every coil — with inclusion rating and carbide checks on customer demand.

Raw Material Incoming Inspection at 4BH Steel Wires & Bars
03

Raw Material Pickling

Wire rod coils are acid pickled, lime neutralized, water rinsed and cleaned with a high-pressure water jet.

Raw Material Pickling at 4BH Steel Wires & Bars
04

Cold Drawing

Phosphate-coated wire rod coils are cold drawn to customer requirement using tungsten carbide drawing dies, with in-process inspection for dimensions, ovality and surface defects.

Cold Drawing at 4BH Steel Wires & Bars
05

Spheroidised Annealing

Pickled wire rods are annealed in atmosphere-controlled, pit-type oil-fired and electric-heated furnaces to a controlled microstructure per SEP 1520:1978, with decarburization limited by high-purity nitrogen purging.

Spheroidised Annealing at 4BH Steel Wires & Bars
06

Micro Inspection & Hardness / Tensile Testing

Samples from every annealed and drawn coil are tested for microstructure, decarburization, hardness (BHN) and ultimate tensile strength.

Micro Inspection & Hardness / Tensile Testing at 4BH Steel Wires & Bars
07

Pickling, Phosphating & Neutralisation

Annealed coils are re-pickled, water-jet cleaned, phosphate coated and lime neutralised for rust resistance and lubrication ahead of further drawing.

Pickling, Phosphating & Neutralisation at 4BH Steel Wires & Bars
08

Section Rolling

High-carbon profile section wires (Flat, Trapezoid, Rectangular, Square) are cold rolled from spheroidised-annealed round wire on our Turk Head machine.

Section Rolling at 4BH Steel Wires & Bars
09

Strapping & Weighing

Accepted drawn coils are steel strapped or wire bound at three or four places and weighed on an electronic crane weighing scale.

Strapping & Weighing at 4BH Steel Wires & Bars
10

Oiling, Packing & Labelling

Coils are oiled on request, centerless ground bars dipped in rust-preventive oil, then wrapped in woven plastic or hessian cloth with polyethylene lamination and labelled with grade, size, weight and stock code.

Oiling, Packing & Labelling at 4BH Steel Wires & Bars
11

Storage & Dispatch

Finished coils are stored in the finished goods yard for domestic dispatch, while export product is stacked in 100% plywood crates and loaded with care to avoid transit damage.

Storage & Dispatch at 4BH Steel Wires & Bars
// SUB-PROCESS

Centerless Grinding Process

Decoiling and cutting of drawn wire coils
STEP 1

Decoiling & Cutting

Accepted drawn wire coils are decoiled and cut into required lengths.

Straightening and polishing of cut bars
STEP 2

Straightening & Polishing

Bars are straightened and polished for surface finish and straightness — max 1mm bend per meter.

Centerless grinding to final size and tolerance
STEP 3

Centerless Grinding

Bright bars are centerless ground to the required size and tolerance per customer specification.