Packaging and responsible storage of steel products
Stainless steel is stored separately from carbon steel, on dry racks, with a gap from the floor and walls, under a protective film or paper.
Consignment of steel products is the transfer of a batch to the warehouse of an intermediary or a buyer while the seller keeps title until sale: the goods sit on someone else's site but remain in the sender's stock. Responsible storage differs from consignment in that the warehouse only stores the cargo and is answerable for its safekeeping, while title and risks remain with the owner.
How stainless steel is stored
The main enemy of stainless steel in a warehouse is not the air but foreign steel and moisture. Particles of carbon steel, dust from grinding, welding spatter and condensation cause pitting rust even on 304 and 316.
Basic warehouse rules:
- a separate zone for stainless steel, ideally a separate rack or a separate bay;
- a pallet or rack with a gap from the floor of at least 100 mm;
- a gap from walls and gates so that condensation does not collect;
- a roof or a canopy: stainless steel is not stored in the open air;
- no direct contact with carbon steel, galvanised steel or aluminium;
- separate tools for stainless steel: brushes, slings, hooks, knives;
- ventilation in the room so that moisture does not stagnate between the sheets.
Sheets are laid on a level base so that there is no sagging and no standing water in the gaps. Pipes are stored in pyramids or on racks with spacers between the rows: this way they do not touch each other and do not rub the surface. Round bar and angle are more conveniently kept in bundles on spacers.
Coils, flat bar and strip are a separate story. They are stored horizontally on pallets, in factory packaging, because the edge of a coil deforms easily, and moisture between the turns stays longer than on a sheet.
| Item | How it is stored | What it protects against |
|---|---|---|
| Sheet | Horizontally on a pallet, with spacers | Sagging, standing moisture, scratches |
| Round pipe | On a rack or in a pyramid with spacers | Rubbing marks, ovality, contact with foreign steel |
| Profile pipe | In bundles on spacers | Deformation of the faces, scuff marks |
| Round bar | In bundles, with the ends facing the aisle | Bending, nicks on the edge |
| Angle | On spacers, with the flanges up | Bending of the flange, rubbing marks |
| Coil and strip | Horizontally in factory packaging | Deformation of the edge, moisture between the turns |
In-process protection
Between operations, rolled steel spends more time in the warehouse than in production. In-process protection bridges this gap: while a part waits for bending, welding or shipment, the surface must not pick up contamination.
What is done:
- after cutting, chips and abrasive particles are removed, and the edge is cleaned;
- after bending, traces of cutting fluid are removed and the surface is wiped;
- after welding, the seam is cleaned of scale if the part does not go straight to pickling;
- finished parts are covered rather than left open by the aisle;
- during a break of more than a week, the surface is preserved with film or paper.
In a steel products warehouse, in-process protection comes down to three actions: do not mix grades, do not place stainless steel by the gates and do not cut carbon steel next to exposed stainless steel. Sparks and abrasive dust fly far and leave a scattering of small rust spots on the surface, which are then taken for a defect of the grade.
Films and paper
Packaging of stainless steel solves two tasks: to protect the surface from mechanical damage and to prevent moisture from lingering on the metal.
| Material | What it is for | Features |
|---|---|---|
| Polyethylene film | Sheet, profile, finished parts | Does not let water through, but condensation builds up under it when the temperature changes |
| Adhesive film | Sheet for polishing and mirror finish | Protects from scratches during cutting and installation, peels off without traces |
| Inhibitor paper | Sheet, round bar, critical surfaces | Inhibits corrosion but is afraid of getting wet |
| Foam material | Edges, corners, ends | Absorbs impacts in transit |
| Crating and wooden shield | Sheet packs, pipe bundles | Holds the shape of the pack, does not touch the metal directly |
| Metal strapping | Packs and bundles | Secures the cargo, requires spacers under the band |
Polyethylene must not be wrapped around a wet surface and must not be left on the metal in hot weather under direct sun: condensation collects under the film, and glue marks remain on the edge. Inhibitor paper works while it is dry: once wet, it becomes a source of corrosion itself.
For a mirror and polished surface, adhesive film is mandatory. The protection must be removed within the period specified by the film manufacturer: leaving it on too long leaves glue marks that have to be removed by polishing.
Responsible storage
Responsible storage is a service in which the warehouse accepts the cargo, places it, keeps records and is answerable for its safekeeping. Title remains with the owner, and the owner also bears the risks of accidental loss unless the contract provides otherwise.
What the service includes:
- acceptance by quantity and external condition;
- placement in a covered warehouse by grade, batch and size;
- records of remnants and movement by batch;
- maintaining the conditions: temperature, humidity, ventilation;
- shipment on the owner's instruction;
- paperwork for acceptance, storage and release.
Consignment of steel products is closer to trade: the goods are transferred to an intermediary's warehouse, which sells them in its own name or in the owner's name, and payment is made on actual sale. The difference between the schemes is who sells and when title passes.
| Scheme | Who sells | Title | Who pays for storage |
|---|---|---|---|
| Responsible storage | The owner | Remains with the owner | The owner |
| Consignment | The intermediary or the warehouse | Passes on sale | The party under the contract |
| Area lease | The owner | Remains with the owner | The owner |
| Storage as part of a trade | The parties to the trade | Under the terms of the trade | Under the terms of the trade |
At the exchange, storage is not the platform's responsibility: the exchange only matches orders and records the trade, while settlements, delivery and warehousing take place directly between the parties. That is why the parties agree the terms of storage, packaging and transfer of risk in the order and the contract.
What to check before transferring a batch to someone else's warehouse:
- whether there is a separate zone for stainless steel or it will be placed with carbon steel;
- how the racks are arranged and whether there is a gap from the floor;
- what humidity and temperature control there is in the room;
- how records are kept by batch and heat number;
- who is answerable for damage during movement inside the warehouse;
- how release is processed and against which documents.
Frequently asked questions
What is consignment of steel products
Transfer of a batch to an intermediary's warehouse while the seller keeps title until the moment of sale. The intermediary sells the goods, and payment is made on actual sale.
How does consignment differ from responsible storage
With consignment the goods are sold; with responsible storage they are only stored. In the first case title passes on sale, in the second it remains with the owner.
How should stainless steel be stored in a warehouse
In a covered room, on racks with a gap from the floor, separately from carbon steel, with ventilation and without contact with moisture.
Can stainless steel be stored outdoors
It is not recommended. Rain, condensation and dust from foreign steel cause pitting rust even on 304 and 316. A canopy or a covered warehouse is needed.
Which film is needed for stainless steel
For ordinary surfaces, polyethylene; for polished and mirror surfaces, adhesive film. Film is not wrapped around wet metal.
Why does stainless steel rust in a warehouse
Most often because of particles of carbon steel, moisture under the film or contact with foreign steel. The grade itself may be perfectly fine.
Who is answerable for the cargo in responsible storage
The warehouse is answerable for safekeeping within the contract. The risks of accidental loss remain with the owner unless the parties have agreed otherwise.
Is storage part of a trade at the exchange
No. The exchange matches orders and records the trade, while storage, delivery and insurance are a matter for the contract between the parties.
What to look at next
- How to choose a stainless steel supplier — what to check at the warehouse before ordering.
- Logistics of steel products: road, rail, container — how to transport steel products without damage.
- Slow-moving stock and remnants: how to sell instead of writing off — what to do with items that have been sitting for a long time.
- Catalogue of stainless steel products — 68 items with surface finishes for storage and processing.
- How the exchange works — timeframes, deposit and the trade procedure.