Cold Rolled (DKP) vs Pickled and Oiled (HRP) Steel Sheet
Production, surface, tolerance and cost differences between cold rolled and pickled-and-oiled sheet — and which one to choose for which part.
Two products are confused more often than any others in sheet procurement: cold rolled and pickled-and-oiled steel. Both are described as "clean surfaced", both can be produced from the same steel grade, yet their processing routes, mechanical behaviour and prices differ clearly. The wrong choice means either unnecessary cost or scrapped parts.
Two products, two stops on the same line
Pickled and oiled sheet (HRP) is obtained by running a hot rolled coil through a pickling line. The mill scale formed during hot rolling is dissolved in an acid bath and a thin oil film is then applied against corrosion. The material is still fundamentally a hot rolled product; only its surface has been cleaned.
Cold rolled sheet (DKP) starts where pickling ends. The pickled coil is rolled again at room temperature to reduce thickness; the material, work-hardened by cold deformation, is softened in an annealing furnace and finished on a temper mill that sets its final surface and mechanical properties. In short, cold rolled sheet is the output of the next processing stage after pickled sheet.
Property comparison
| Property | Pickled and oiled | Cold rolled |
|---|---|---|
| Typical thickness range | 1.50 – 6.00 mm | 0.40 – 3.00 mm |
| Surface appearance | Matt, slightly textured | Smooth, semi-bright |
| Thickness tolerance | Standard | Narrow (precise) |
| Formability | Good | Very good, suitable for deep drawing |
| Paint and coating compatibility | Good | Very good |
| Relevant standard | EN 10111 / EN 10025 | EN 10130 |
| Unit cost | More economical | Higher |
Reading the grade codes
On the cold rolled side, EN 10130 defines DC01 for general forming, DC03 for drawing, DC04 for deep drawing and DC05 for special deep drawing. As the number rises, yield strength falls and elongation increases, so the material takes shape more easily. On the pickled side, structural grades are S235JR, S275JR and S355JR, while forming grades are coded DD11, DD12 and DD13.
Stating the grade code alongside thickness and width is the most practical way of receiving the right material on the first shipment.
Which sheet for which job?
- Choose pickled and oiled: if you work above 1.5 mm; if you produce structural parts such as chassis members, buckets, trailer bodies or agricultural machinery components; if surface appearance is not critical but you need scale-free, weld-ready material.
- Choose cold rolled: if you need thin gauges and narrow tolerances; if the part will be painted, galvanized or enamelled; if deep drawing, hemming or ironing is involved; if you produce visible surfaces such as white goods panels, furniture or electrical enclosures.
A cost perspective: do not over-specify
Cold rolled sheet costs more because of the additional processing stages. That is why a single purchasing rule works well: never buy a higher specification than the application requires. Asking for cold rolled material for a 4 mm chassis reinforcement is wasted money, while insisting on pickled sheet for a 0.8 mm panel that will be painted creates surface and tolerance problems.
In the overlapping band of 1.5–3.0 mm both products are technically usable. Here the decision is driven by surface expectation and forming severity: cold rolled if the part will be painted and visible, pickled if it will disappear inside a welded assembly.
Pre-order checklist
- Thickness, width and length tolerances: EN 10051 or an order-specific tolerance.
- Grade code: DC01–DC05, or DD11–DD13 / S235JR–S355JR.
- Surface: oiled or dry, and how long will transport and storage take?
- Form: coil, slit coil or sheet — does it match your cutting plan?
- Documentation: is an EN 10204 3.1 mill test certificate required?
Storage and surface protection
On both products the surface protection has a limited life. The protective oil film on pickled sheet loses its effect within a few weeks outdoors or in humid conditions, while the thinner oil layer on cold rolled sheet is even more delicate: fingerprints, condensation or leaking water leave marks quickly.
Three rules work well in practice. Store coils indoors, on timber blocks so they never touch the floor. Let the material reach ambient temperature before opening the packaging; a cold coil sweats in a warm store and leaves condensation stains. Finally, plan stock turnover around the expected shelf life of the product. For batches that will wait a long time, you can ask your supplier for heavier oiling or VCI packaging.
Cutting and downstream operations
The slitting and cut-to-length plan is the single biggest driver of waste for both products. For tight-tolerance cold rolled parts, specify the slit width based on the finished part size plus the die feeding allowance, not the part size alone. On pickled sheet the burr left at the cut edge may require cleaning before welding; for heavier gauges a saw cut gives a cleaner edge than plasma.
For batches heading to laser cutting, the type of surface oil also matters: heavily oiled coils can reduce cut quality, so noting "laser quality" on the order saves time later.
Let us choose the right product together: review the technical tables on our cold rolled sheet and pickled and oiled sheet pages, and calculate your tonnage in seconds with our weight calculator.