Chrome-plated bars ship by sea in a small number of standard packing forms: protective film on the finished surface, cotton-rope-tied bundles, and wooden cases or wooden pallets. Which outer form is right depends on diameter, cut length, order quantity, how the bars are handled at both ports, and how much surface protection the application needs.
How should chrome-plated bars be packed for sea freight?
The normal arrangement is protective film on the bar, bundles tied with cotton rope, and then the bundle closed in a wooden case or carried on a wooden pallet. Yixin does not use steel straps on finished bars, because they mark the chrome; they are used on raw bar only.
Chrome plating is a finish, not packaging, so the packing carries the bars through the container. Three things decide the form: how the bars are ordered, how heavy each unit is, and how it will be handled at the destination.
Cut length comes first. Bars cut to a customer length that matches a case or a pallet need fewer handling steps than a bundle of mixed lengths. Yixin Precision Machinery (Changzhou) supplies full bars of 4 m, 6 m, 7.5 m or 8.1 m, and cuts bar to length on CNC saws from 200 mm, with about 3 mm allowance and the ends left as sawn.
Diameter and mass come next. Yixin's bar range runs from Ø4 mm to Ø140 mm from stock, with larger sizes up to Ø200 mm made to order, so a bundle of a single diameter can range from something one person can carry to something that needs a forklift at each end. If the receiving site has no forklift, say so on the inquiry; the case or pallet design and the number of lifting points change with it.
Storage at destination matters as well. Bars that go straight to a machine can travel with lighter protection than bars that will sit in a warehouse. If there will be a gap between arrival and use, put that in the inquiry so the film and the outer packing are chosen for storage as well as transport.
Wooden case or wooden pallet — which should you specify?
The film-wrapped, cotton-rope-tied bundle is the same either way. For full lengths in reasonable quantity, a wooden pallet is normally enough. Choose a wooden case when the shipment mixes diameters or contains short cut lengths, and a wooden pallet when the bundle should stay closed until it reaches the machine.
| Packing form | Order it suits | What to state on the RFQ |
|---|---|---|
| Film-wrapped, cotton-rope-tied bundle (inner packing) | Every order, inside the case or on the pallet | Bundle mass, lifting points, whether bars may touch inside the bundle |
| Wooden case | Short cut lengths, small diameters, several diameters in one shipment | Case internal length, maximum case mass, how bars are separated inside |
| Wooden pallet | Full lengths; bundles that must stay closed and be moved by forklift | Pallet footprint, stack height, how the bundle is secured to the pallet, forklift access at destination |
A bundle on a wooden pallet is the easier form to inspect on arrival: it can be checked without opening a case. A case gives more protection and takes more container volume for the same mass, which is often the right trade for small diameters or mixed items. A pallet keeps the bundle closed, and the base gives a forklift a defined lift point.
Whichever form you choose, ask for the same marks on the packing list as on the physical bundle or case. That single detail decides how quickly your warehouse can reconcile the delivery against the order.
How do you protect the chrome surface during sea freight?
Protective film on the chrome, plus separation so bars do not rub against each other or against other cargo, is what carries the surface through the voyage intact.
Chrome layers are thin. The hard chrome on Yixin bars is 10–50 μm per side, with the thickness chosen per order; chrome hardness is HV800+ and the chrome finish is Ra ≤ 0.4 μm. A layer in that range is a wear surface for the finished machine, so it should not be asked to survive the voyage on its own.
State the following in the inquiry or on the drawing:
- whether protective film must cover the full length or whether the bar ends may be left uncovered;
- how bars are to be separated inside the bundle;
- whether the outer packing must be closed, as a wooden case, or may stay open, as a bundle on a wooden pallet;
- the surface condition required on arrival, including whether bars will be handled again before assembly.
If the application calls for corrosion resistance beyond the chrome layer itself, raise it early. Salt-spray performance is not part of the standard specification. Where a rating is required, we specify a thicker chrome layer and can have the order tested by a third-party laboratory.
Yixin's chrome-plated and ground products use the same family of packing forms. What changes between them is how much surface protection the order needs and how much handling the bars will see before installation.
What documents and checks travel with the shipment?
The commercial invoice, packing list and mill certificate travel with the order; a certificate of origin is arranged per order, and third-party inspection is arranged on request.
The packing list is the document that ties the packing to the delivery. Marks, bundle numbers, case numbers, diameters, lengths and quantities should match the physical packing exactly, so the receiving site can check counts before opening anything.
The mill certificate identifies the grade and carries the heat analysis, forwarded unaltered; the supplied condition is fixed on the order and drawing. Keep it with the packing list in the incoming inspection file; if the bars are cut and installed later, the certificate is the record that connects the installed bar to the delivered batch.
Ask for a certificate of origin with the inquiry if your customs procedure needs one. It is arranged per order rather than supplied as standard.
Third-party inspection is arranged on request. It applies to a specific order, not to every shipment, so build it into the schedule before the container is booked rather than after.
How does packing affect lead time and the shipping terms?
Packing is usually not the critical path; cutting, heat treatment and booking are. It still has to be agreed before the order is confirmed, because it belongs in the quotation and on the packing list.
Standard lead times are cut-to-length from stock 3–5 days, non-standard diameters 7–10 days and custom heat treatment 10–20 days, with 42CrMo Q&T chrome-plated bar at 7–10 days, in each case plus sea-freight booking. The minimum order is 1 t; sample orders of 20–50 kg are available. Samples are charged, the sample fee is refunded when a formal order is placed, and freight is paid by the buyer. Trade is FOB Shanghai or Ningbo, with payment by T/T: a 50% deposit with the order and the balance before shipment.
Packing requirements are agreed with the order, so state them with the inquiry. If your destination needs a wooden case with a defined internal length, or the order mixes several diameters in one shipment, the quotation should already include the packing, the documents and the shipping term.
What to put in your RFQ
- Product name, grade and condition, for example 45 Steel Induction-Hardened Chrome Shaft, 40Cr Q&T Chrome-Plated Bar or 42CrMo Q&T Chrome-Plated Bar.
- Diameter in mm and length per piece: full bars of 4 m, 6 m, 7.5 m or 8.1 m, or cut to length from 200 mm (CNC saw, about 3 mm allowance, ends as sawn).
- Total quantity in tonnes, and how you want the order split into bundles — by diameter, by length or by destination.
- Chrome specification for chrome-plated items, including chrome thickness (10–50 μm per side, chosen per order) and the required surface finish.
- Packing form: film-wrapped, cotton-rope-tied bundles in a wooden case or on a wooden pallet, plus maximum bundle or case mass and the lifting equipment available at destination.
- Documents: mill certificate, packing list, certificate of origin if required, and whether third-party inspection should be arranged.
- Trade term FOB Shanghai or Ningbo, payment by T/T (50% deposit with the order, balance before shipment), and the destination port.
Summary
Sea freight packing for chrome-plated bars comes down to three layers: protective film on the chrome, cotton rope that ties the bundle, and an outer form — a wooden case or a wooden pallet. Choose by cut length, diameter, quantity and the handling available at destination, and write the choice into the inquiry so it appears in the quotation and on the packing list. Add the documents you need, including a certificate of origin arranged per order and third-party inspection on request, and confirm the trade term and lead time at the same time.