TECHNICAL CAPABILITIES & MANUFACTURING MANUAL
End-to-End Process Engineering, Procurement, & Quality Specifications
Bhargav Metal Industries Pvt Ltd ensures an end-to-end operational framework, from the rigorous procurement of raw copper to the final precision engineering of our copper ingots, bare copper coils, and precision copper strips. We maintain an uncompromising commitment to structural integrity, surface excellence, and high-purity electrical conductivity. By aligning our processes with international frameworks (such as ASTM and EN), we ensure that our products integrate seamlessly into your high-demand manufacturing chains
The Foundation: Raw Material Procurement & Inward QC
Our manufacturing philosophy relies on a fundamental law of metallurgy: the final product can only ever be as pure as the raw material fed into the furnace. To eliminate trace element contamination and maintain excellent electrical performance, we manage three strict, isolated raw material procurement channels.
Strategic Material Streams
Grade-A Copper Cathodes:
Sourced strictly from registered primary electro-refineries, boasting a certified purity of 99.99% Cu. This pristine feed is dedicated exclusively to our high-conductivity bare copper coils and ultra-thin electronics-grade strips.
No. 1 Copper Scrap:
Consists of clean, untinned, uncoated, and unalloyed bare copper wires and sheets. Every lot must exhibit a minimum copper content of 99.90% and be free of brittle copper wire alloys.
No. 2 Copper Scrap:
Comprises clean, unalloyed copper solids, wire, or miscellaneous scrap with minor surface oxidation or localised soldering/plating. This material is selectively utilised for ingot casting, where pyrometallurgical refining eliminates volatile surface impurities.
Gate-Keeper Quality Control Protocol
Before any shipment crosses our facility gates, our Quality Assurance (QA) team executes a three-tier material validation:
Radioactivity & Hazardous Screening:
Every bulk vehicle passes through automated radiation portal monitors to guarantee absolute environmental and workplacesafety.
Optical Emission Spectrometry (OES):
Representative solid core samples from every lot are extracted, melted in a specialised lab-scale induction crucible, and shot on our spark spectrometer to map elemental compositions down to single-digit parts per million (ppm). We stringently restrict path elements such as Lead (Pb), Bismuth (Bi), Arsenic (As), and Antimony (Sb), which degrade electrical conductivity.
Moisture & Contamination Audit:
Scrap bundles are physically checked for trapped moisture, oils, or foreign mechanical attachments. Dry storage is strictly maintained in enclosed, temperature-monitored bays to eliminate the risk of hydrogen steam explosions inside our melting furnaces.
Product Deep Dive: Process Engineering & Specifications
High-Purity Copper Ingots
Copper ingots serve as our primary structural blocks, engineered for seamless remelting, casting, and downstream alloying operations across secondary metal industries.
Manufacturing Process Flow
The transition from raw scrap/cathode to a solid, structured ingot follows a precise pyrometallurgical cycle:
Furnace Charging & Melting:
Selected copper charge materials are fed into our high-capacity induction/reverberatory furnaces. The thermal gradient is strictly set to 1085°C-1150°C to achieve a rapid phase transition without excessive metal vaporisation.
Fire Refining & Slagging:
Air or pure oxygen is injected into the liquid metal bath to intentionally oxidise remaining base metal trace impurities (such as iron or aluminium), which float to the top and are skimmed off as solid slag.
Poling & Deoxidization:
To lower the oxygen potential of the bath, we introduce natural gas or controlled reducing agents. This process reduces copper oxides back into elemental copper, driving the residual oxygen levels down to tightly controlled thresholds.
Continuous Casting:
The refined molten copper is laundered into heavy, water-cooled cast iron moulds arranged on a highly synchronised rotary casting wheel.
Quenching & Strip-Moulding:
Automatic ejection mechanisms drop the solidified ingots into an internal water-quench bath to lock in a fine-grain crystalline microstructure and minimise atmospheric oxidation.
Ingot Technical Specifications
Parameters | Electrolytic Tough Pitch (ETP) Grade | Phosphorus Deoxidised (DHP) Grade |
|---|---|---|
Surface Condition | Free of gas cavities, deep shrinkage cracks, cold shuts, and heavy slag inclusions. Clean metallic lustre finish. | Free of gas cavities, deep shrinkage cracks, cold shuts, and heavy slag inclusions. Clean metallic lustre finish. |
Residual Phosphorus (P) | Not Applicable | 0% |
Oxygen Content (O2) | 100 – 400 ppm | < 15 ppm (Maximised Deox) |
Copper Content (Cu) | 99.90% Minimum | 99.85% Minimum |
Bare Copper Coils (Continuous Wire Rod)
Engineered for high-speed wire drawing, cable extrusion, and heavy electrical grounding applications, our bare copper coils provide unmatched ductility and electrical performance.
Manufacturing Process Flow
We utilize an advanced continuous casting and hot rolling framework to bypass traditional batch boundaries:
Shaft Furnace Reduction:
Grade-A copper cathodes are continuously charged into a vertical shaft furnace where a highly reductive gas atmosphere prevents any oxygen pickup during melting.
Twin-Belt Continuous Casting:
The liquid copper pours evenly into the groove of a rotating casting wheel sealed by a tensioned steel belt. Rapid, high-volume water cooling solidifies the stream into a continuous, endless hot copper bar.
In-Line Multi-Stand Rolling:
The glowing copper bar passes immediately into a continuous reduction rolling mill. A sequence of alternating oval and round rolling passes mechanically compresses the thick bar down to standard commercial diameters (8mm, 12mm, or 16mm). This extreme hot-working refines the grain structure.
In-Line Chemical Pickling:
As the hot rod exits the final rolling stand, it enters an enclosed tube where it is drenched in a heated, dilute acid or alcohol-based solution. This instantly breaks down and strips the dark copper oxide film, exposing a bright, clean, bare metallic finish.
Coiling & Anti-Tarnish Protection:
The clean wire rod is guided into a dynamic orbital coiler. Before being bound, a microscopically thin coating of synthetic wax or water-soluble anti-tarnish agent is applied to shield the copper from ambient humidity during maritime transport or long-term warehousing.
Bare Copper Coil Technical Specifications
Copper Purity (Cu): ≥99.90% (Typically 99.95%+ compliant with ASTM B49 / BS EN 1977).
Electrical Conductivity: ≥100% IACS (often reaching 101.5% IACS, satisfying the International Annealed Copper Standard).
Standard Diameters: Nominal 8.0mm, 12.0mm, 16.0mm (Held strictly within a tolerance of ±0.38mm).
Elongation at Break: >35% to 40%, ensuring the metal is highly ductile and will not snap during high-speed multi-wire drawing.
Surface Roughness (Ra): <3.0μm (Profilometer verified, ensuring a surface free of seams, slivers, or oxide scaling).
Precision Copper Strips
Welcome
Tailored for high-frequency transformer windings, industrial switchgears, automotive radiators, and electronic shielding, our copper strips deliver tight dimensional tolerances and tailored tempers.
Manufacturing Process Flow
Slab Breakdown or Heavy Gauge Feed:
The process starts with heavy-gauge hot-rolled coils or thick cast copper slabs (cakes). Slabs undergo hot rolling down to a breakdown strip thickness.
High-Precision Cold Rolling:
The intermediate strip is processed through high-rigidity multi-high cold rolling mills (4-Hi or 20-Hi Sendzimir configurations). Cold rolling reduces thickness with extreme precision while strengthening the metal through work-hardening.
Atmospheric Protective Annealing:
To meet varied mechanical requirements, the work-hardened coils are placed in sealed bell-type annealing furnaces. The atmosphere is purged and blanketed with 100% pure Nitrogen or Hydrogen. This heat treatment recrystallises the copper structure to the desired soft or half-hard temper without allowing oxygen to discolour or stain the surface.
Precision Slitting:
The wide-rolled strip passes through a high-tonnage slitting line equipped with dynamic, razor-sharp rotary knives, slicing the mother coil into precise, customer-specified widths.
In-Line Edge Conditioning:
For electrical strip applications, the sharp edges left by the slitting blades are mechanically planed, deburred, or fully rounded. This step is critical to prevent short circuits or insulation tearing during transformer winding.
Copper Strip Technical Specifications
Governing Standards:
Manufactured in strict compliance with ASTM B152 and DIN EN 1652.
Dimensional Range & Tolerances:
* Thickness: 0.10 mm to 4.00 mm (Held tight to ±0.01mm to ±0.03mm).Width: 10 mm to 450 mm (Held tight to ±0.10mm).
Mechanical Properties & Tempers:
Soft (Annealed) Temper: Tensile Strength (Rm) 200 – 250 MPa; Elongation (A50mm) ≥35%. (Optimised for effortless winding and forming).
Half-Hard / Hard Temper: Tensile Strength (Rm) 290 – 380+ MPa; Elongation (A50mm) <15%. (Optimised for structural stability and spring applications).
Edge Profile Options: Slit Edge, Deburred Edge, or Fully Rounded Radius Edges (engineered for high-voltage transformer isolation).
Bare Copper Coils (8MM Continuous Wire Rod)
Our standard 8.0mm diameter bare copper rod is optimized as a feeder material for high-speed multi-wire drawing lines, cable extrusion, and heavy electrical grounding applications.
The Manufacturing Process Flow: Cast to Coil
We utilize an advanced, oxygen-free continuous casting and multi-stand hot rolling framework to bypass traditional batch boundaries:
Shaft Furnace Reduction:
Grade-A copper cathodes are continuously charged into a vertical shaft furnace where a highly reductive gas atmosphere prevents oxygen pickup during melting.
Twin-Belt Continuous Casting:
The liquid copper pours into the groove of a rotating casting wheel sealed by a tensioned steel belt. Rapid, high-volume water cooling solidifies the stream into an endless hot copper bar.
In-Line Multi-Stand Rolling:
The glowing copper bar passes directly into a sequence of alternating oval and round rolling passes, mechanically compressing the thick bar down to a precise 8.0mm diameter. This extreme hot-working refines the grain structure.
In-Line Pickling:
The hot rod exits the final rolling stand and enters an enclosed tube where it is drenched in a heated, dilute acid solution. This instantly breaks down the dark copper oxide film, exposing a bright, clean, metallic finish.
Coiling & Anti-Tarnish Protection:
The clean wire rod is guided into a dynamic orbital coiler. Before being bound, a microscopically thin coating of synthetic anti-tarnish agent is applied to shield the copper from ambient humidity during maritime transport.
Bare Copper Wire Technical Specifications
8MM Bare Copper Coil
Diameter / Thickness : 8.0 mm (Tol: ±0.38mm)
Material Purity (Cu): ≥99.95% (ASTM B49 compliant)
Electrical Conductivity: ≥101.0% IACS
Ductility (Elongation): >35% to 40% (for extreme drawing)
Surface Finish: Bright, pickled metallic (Anti-tarnish treated)
Application Suitability : High-speed multi-wire drawing lines
High-Purity Bare Copper Plates (Sheared & Etched)
Welcome
Designed for electrical distribution, grounding busbars, and precision chemical etching applications, our copper plates are produced to meet stringent surface finish and flatness standards.
The Plate Fabrication Process: Rolling to Dimension
Our plate manufacturing ensures extreme material consistency and superior surface quality
Reheating & Breakdown:
Thick copper slabs (or ingots) are reheated to optimal rolling temperatures.
Multi-Pass Reverse Rolling:
The slab is passed repeatedly through a reversible rolling mill. This process systematically reduces the thickness while simultaneously increasing the width and refining the metal’s crystalline structure for superior strength and ductility.
Levelling & Annealing:
The rolled plates pass through a multi-roll levelling system to achieve exceptional flatness. They are then precisely annealed to ensure uniform mechanical properties across the entire surface.
Surface Treatment & Precision Shearing:
The plates undergo chemical pickling to remove mill scale, exposing a clean surface with a unique micro-crystalline etched pattern. They are then precision-sheared to final dimension specifications (e.g., 2ft x 4ft).
Bare Copper Plates Technical Specifications
Diameter / Thickness: Specified by order (e.g., 6mm to 50mm)
Material Purity (Cu): ≥99.95% (ASTM B152 / BS EN 1652)
Electrical Conductivity: ≥101.0% IACS
Ductility (Elongation): Superior for bending & busbar fabrication
Surface Finish: Clean, pickled finish with characteristic etched grain pattern
Application Suitability: Grounding systems, electrical busbars, chemical etching
Protecting Your Production: The "Path Elements" We Eliminate
When copper contains even microscopic traces of the wrong elements, it can fail under stress. Our state-of-the-art metallurgical laboratory tests every incoming batch to fiercely eliminate the "enemies" of high-purity copper:
Zero Lead (Pb) & Bismuth (Bi) Compromise:
Even a fraction of a per cent of these elements can cause copper to become brittle at high temperatures. By keeping these at near-zero levels, we guarantee our Bare Copper Coils will draw smoothly into ultra-fine wires without snapping on your high-speed machines.
Conductivity Protection (Iron & Phosphorus):
A tiny trace of iron acts like an electrical roadblock. Our strict sorting ensures your materials maintain a minimum of 100% IACS electrical conductivity, preventing power loss and overheating in your final electrical applications.
How Our Internal Scrap Processing Works
Before any copper enters our melting department, it passes through a strict quality-assurance gate:
Mechanical Stripping:
We use eco-friendly mechanical wire strippers to clean insulated cables down to the bare copper core. We never burn insulated wire, avoiding harmful carbon and ash contamination.
Magnetic Cross-Separation:
All loose scrap passes beneath high-intensity industrial magnets to pull out foreign steel bolts, iron clips, or brackets.
Hydraulic Briquetting:
Clean, loose wire is compressed into ultra-dense, solid copper "bricks." This minimising of surface area drastically reduces metal oxidation during melting, resulting in a cleaner, higher-yield melt for your products.
Our Promise to You
Whether your application demands 99.99% pure Oxygen-Free Copper or standard industrial ETP Copper Ingots, our rigorous scrap management workflow ensures that you receive sustainable, environmentally responsible copper without a single drop of compromise in purity, geometry, or electrical performance.
Partner with us, and experience engineering excellence from the raw block to the finished coil.