For a steel mill, foundry or smelter, scrap is not waste. It is raw material, often the largest cost in the business. A few percentage points of yield loss, or a few rupees per kilogram overpaid, can decide whether a month is profitable. Yet many buyers still source scrap through a small circle of traders with loose specifications and informal weighing. This guide sets out how to buy scrap in bulk more reliably and profitably.
Step 1: Define exactly what you need
Every furnace and process has an ideal charge mix. Write it down as a specification for each grade:
- Material and grade: e.g. heavy MS, HMS 1&2 80:20, shredded, CI, 6063 extrusion, Berry copper.
- Size limits: Maximum dimensions to suit charging boxes or furnace openings.
- Thickness: For ferrous, minimum thickness distribution.
- Contamination limits: Maximum percentage of non-metallics, coatings, oil, moisture, dirt.
- Prohibited items: Sealed containers, explosives, radioactive materials, hazardous waste.
- Chemistry: For alloy and non-ferrous grades, critical elements and limits.
Clear specifications let suppliers prepare material properly and give you grounds to reject or claim.
Step 2: Estimate volumes and schedules
Plan monthly requirements by grade, with buffer stock targets. Suppliers can offer better prices when they know your volumes in advance. Also define:
- Delivery location and receiving hours.
- Unloading capacity per day.
- Storage space for each grade.
Step 3: Build a diversified supplier base
Relying on one or two traders creates risk. A balanced mix might include:
- Direct factory sellers: Clean, consistent production scrap.
- Regional aggregators and traders: Volume and flexibility.
- Demolition and dismantling contractors: Heavy structural and plate.
- Imported scrap: Consistent grades, useful as a price benchmark.
- Marketplace platforms: Access to verified sellers across states.
Geographic diversification also helps when regional supply tightens.
Step 4: Vet suppliers
Before placing significant orders:
- Verify GSTIN status on the GST portal.
- Visit the supplier's yard if possible.
- Check references from other mills.
- Review sample lots before committing to volume.
- Understand their sources and processing capability.
Under GST, buying metal scrap from unregistered suppliers triggers reverse charge, and buying from registered suppliers above the threshold requires 2% GST TDS. Supplier status affects your compliance workload.
Step 5: Choose a pricing method
Fixed price per lot
Simple, but risky when markets move fast.
Market-linked pricing
For non-ferrous metals, link to MCX or LME with an agreed discount or premium per grade. For ferrous, link to a published domestic scrap or steel price index or to landed import parity.
Formula pricing with quality adjustments
Base price adjusted for measured yield, contamination or chemistry. Works well for large, regular suppliers.
Tender or reverse auction
Invite bids from approved suppliers for a defined quantity and period.
Whatever method you choose, record it in writing.
Step 6: Control quality at receipt
Quality control at your gate is where money is saved or lost:
- Visual inspection: Check grade, size, contamination against specification.
- Magnet tests for non-ferrous lots.
- Portable XRF for alloys and stainless steel.
- Moisture and oil checks for turnings.
- Radiation detection at the gate, especially for imported or mixed scrap.
- Photographs of each lot as received.
Agree in advance how deductions are calculated, and share inspection results with suppliers promptly.
Step 7: Weigh transparently
Weigh every truck on a calibrated weighbridge, recording tare and gross. For long-distance supplies, compare dispatch weighment with receipt weighment and agree a tolerance. Persistent differences point to problems in loading, transit or measurement.
Step 8: Manage logistics
- Agree whether prices are ex-works (you arrange transport) or delivered.
- Schedule deliveries to avoid queues at your gate.
- Track trucks and e-way bills.
- For imports, coordinate port clearance and inland transport well ahead of vessel arrival.
Step 9: Handle compliance
- Issue purchase orders and receive GST invoices with correct HSN codes.
- Pay GST under reverse charge where applicable and maintain self-invoices.
- Deduct and deposit 2% GST TDS on qualifying metal scrap purchases.
- Check TCS under the Income Tax Act as applicable.
- Retain weighment slips, e-way bills and inspection records.
- For hazardous items found in scrap, follow hazardous waste rules.
Step 10: Track supplier performance
Measure each supplier monthly on:
- Volume delivered vs committed.
- Average yield or quality score.
- Deductions and claims.
- Timeliness.
- Documentation accuracy.
Reward good suppliers with volume and faster payment; phase out poor performers.
Domestic vs imported scrap: when to buy which
Compare landed cost per tonne of usable metal, not just price per tonne. Imported HMS may cost more per tonne but deliver better yield and consistency. Domestic scrap may be cheaper and faster, with less working capital tied up. Many mills use both, shifting the mix as prices move.
Working capital considerations
Scrap suppliers, especially smaller ones, need quick payment. Paying promptly can earn better prices and priority supply. On the other hand, imports often require LCs or advances. Plan your cash cycle around your sourcing mix.
How a marketplace helps bulk buyers
A B2B marketplace lets you post a requirement once and reach verified sellers in many regions. Instead of calling dozens of traders, you receive offers matched to your specification. On Kabadi24, buyers post grade, monthly volume, delivery location and target price. Our team, headquartered in Ramnagar, Varanasi, with a Gurugram branch and a pan-India network, sources from verified sellers and imports, inspects material, arranges logistics and delivers with full documentation.
Sample specification sheet for a buyer
Sharing a short specification sheet with every supplier avoids most disputes. Example for heavy MS for an induction furnace:
| Parameter | Requirement |
|---|---|
| Material | Heavy MS: plates, structural, pipes |
| Thickness | 6 mm and above (min. 80% by weight) |
| Size | Max 1.2 m × 0.5 m, furnace-ready |
| Coatings | Galvanised and painted max 5% |
| Non-metallics | Max 1%; no soil, concrete, rubber, plastic |
| Prohibited | Sealed containers, cylinders, explosives, radioactive items, oil-soaked material |
| Moisture | Visible water not accepted |
| Weighment | Receiving weighbridge; tolerance ±0.3% vs dispatch |
| Deductions | Agreed table for excess light material or contamination |
| Payment | Within 3 days of receipt and inspection |
Adapt the table for each grade and update it as you learn which parameters matter most for your yield.
A worked example: yield matters more than price
Two suppliers offer MS scrap. Supplier A is ₹1 per kg cheaper, but its material is lighter and dirtier, giving 88% yield in the furnace. Supplier B's heavier, cleaner scrap yields 93%. Per tonne of liquid metal, Supplier A requires about 1,136 kg of scrap while Supplier B requires about 1,075 kg. The extra 61 kg of Supplier A's scrap, plus higher power consumption and slag handling, more than cancels the ₹1 per kg saving. Measuring yield by supplier turns these differences into clear purchasing decisions.
Building long-term supplier relationships
The best suppliers prefer buyers who pay on time, share clear specifications, give fair and consistent inspection results, and offer predictable volumes. Treat key suppliers as partners: share forecasts, visit their yards, and resolve issues quickly. In tight markets, these relationships secure supply when others struggle.
Sourcing checklist for the first 90 days
- Write specification sheets for your top three grades.
- Shortlist five to eight suppliers across at least two regions.
- Run sample lots and measure yield for each supplier.
- Agree pricing method and weight tolerance in writing.
- Set up gate inspection, photos and radiation checks.
- Register for GST TDS if required and set up RCM procedures.
- Review supplier scorecards at the end of each month.
Red flags in scrap suppliers
Unusually low prices, reluctance to share GST details, refusal to allow inspection, frequent weight shortfalls and pressure for large advances are warning signs. Pause orders until each concern is resolved.
Conclusion
Buying scrap in bulk is a procurement discipline. Clear specifications, diversified and vetted suppliers, transparent pricing and weighing, rigorous quality control and full compliance turn scrap from a headache into a competitive advantage. Post your requirement and compare offers to see where your current sourcing can improve.