Hot-rolled and cold-rolled steel sheet -
technological differences and selection criteria
The difference between hot-rolled and cold-rolled steel sheet is not just a matter of process temperature. It affects dimensional tolerance, surface quality, behaviour during pressing and price. At a thickness of 2 mm, the tolerance of a cold-rolled product is ±0.10 mm, while that of a hot-rolled product is ±0.17 mm, around 40 per cent more. In September 2026 the price difference between hot-rolled and cold-rolled sheet in Europe was around EUR 130 per tonne. The question is therefore not which one is better, but where the additional processing cost actually pays off.
Two technological routes
Hot rolling takes place above the recrystallisation temperature of steel, in a range of roughly 800-1200 degrees Celsius, with finishing operations in the lower part of this range. The material deforms plastically without work hardening, because the structure is rebuilt continuously. The result is a product with good ductility, but with a surface covered in mill scale and a relatively wide dimensional scatter, caused by the behaviour of the material and the rolls at high temperature.
Cold rolling is carried out at ambient temperature, below the recrystallisation temperature. The material undergoes strain hardening: hardness and strength increase, ductility decreases. Before cold rolling, the strip must be pickled in a sulphuric acid bath with a concentration of around 20 per cent and a temperature close to 100 degrees to remove the scale. After rolling, the material undergoes recrystallisation annealing, which rebuilds the grain structure and restores ductility, followed by skin pass rolling, which gives the final flatness and surface characteristics.
Each of these stages has a cost and each contributes a specific property. Pickling gives a clean surface, cold rolling dimensional accuracy, annealing ductility, and skin passing surface quality and shape stability.
Thickness ranges and standards
| Product group | Standards | Typical thickness range |
|---|---|---|
| hot-rolled structural | EN 10025-2, tolerances EN 10051 | from about 1.5 mm upwards |
| hot-rolled for cold forming | EN 10111, tolerances EN 10051 | 1.5-16 mm as rolled, up to about 12-13 mm pickled |
| cold-rolled for cold forming | EN 10130, tolerances EN 10131 | 0.3-3.0 mm |
| hot-dip coated on cold-rolled substrate | EN 10346, tolerances EN 10143 | 0.35-3.0 mm |
The ranges overlap roughly between 1.5 and 3.0 mm, and this is where the decision is a real one. Below 1.5 mm cold-rolled material is practically the only option, above 3 mm hot-rolled.
Tolerances and geometry
A comparison at the same nominal thickness and a width of up to 1200 mm, for material with a yield strength below 260 MPa, looks as follows.
| Nominal thickness | Hot-rolled product | Cold-rolled product |
|---|---|---|
| 1.0 mm | outside the typical range | ±0.05 mm |
| 2.0 mm | ±0.17 mm | ±0.10 mm |
| 3.0 mm | ±0.20 mm | ±0.15 mm |
| 5.0 mm | ±0.24 mm | outside the range |
The difference is not limited to thickness. A cold-rolled product has better flatness and more repeatable edge geometry, which, when material is fed into an automated line, can matter more than the thickness tolerance itself. The surface after cold rolling is smooth and uniform, ready for painting without additional preparation.
Forming grades
Both product groups have their own scales of formability. For cold-rolled products these are grades DC01 to DC06 to EN 10130, for hot-rolled products DD11 to DD14 to EN 10111. The higher the number, the less demanding the strength requirements and the greater the capacity for deformation.
| Grade | Standard | Re [MPa] | Rm [MPa] | A80 min [%] |
|---|---|---|---|---|
| DC01 | EN 10130 | 140-280 (thickness 0.7-3 mm) | 270-410 | 28 |
| DC03 | EN 10130 | 140-240 (0.7-2 mm) | 270-370 | 34 |
| DC04 | EN 10130 | 140-210 (0.7-2 mm) | 270-350 | 38 |
| DC05 | EN 10130 | 140-180 (0.7-2 mm) | 270-330 | 40 |
| DC06 | EN 10130 | 120-170 (0.7-2 mm) | 270-330 | 41 |
| DD11 | EN 10111 | 170-360 | up to 440 | 23-31 depending on thickness |
| DD12 | EN 10111 | 170-340 | up to 420 | as above |
| DD13 | EN 10111 | 170-330 | up to 400 | as above |
| DD14 | EN 10111 | 170-310 | up to 380 | as above |
For cold-rolled products, two additional coefficients are used to assess suitability for deep drawing: r90, describing plastic anisotropy, and n90, describing strain hardening. For DC04 in thicknesses of 0.7-2 mm, r90 is at least 1.4-1.6 depending on thickness, and n90 at least 0.180. For DC06 the values are at least 1.9-2.1 and 0.220 respectively. The higher the values, the deeper the drawn parts can be without cracking and without excessive wall thinning.
Ordering a higher grade than needed has its price and limits availability. Ordering too low a grade ends in production rejects. The selection should follow from the actual geometry of the part, not from a precautionary margin.
Mill scale and pickled sheet
Hot-rolled sheet in the as-rolled condition has a surface covered in mill scale. This is acceptable in welded structures painted after blast cleaning, but it is a problem wherever weld quality, coating adhesion or tool cleanliness matters.
An intermediate solution is pickled and oiled sheet, produced by removing the scale in an acid bath and protecting the surface with a layer of oil. It retains the properties and thickness range typical of a hot-rolled product while offering a surface prepared for further processing. In practice it is the most common choice for cold-formed products made from material thicker than 3 mm and for automatically welded components.
The price difference and its justification
In September 2026, European price quotations for hot-rolled sheet stood at EUR 790 per tonne in Southern Europe and EUR 770 in Northern Europe, and for cold-rolled sheet at EUR 920 and EUR 890 respectively. The difference of around EUR 120-130 per tonne corresponds to the cost of the additional operations: pickling, cold rolling, annealing and skin passing, plus the yield loss in the process.
From a purchasing perspective, this difference pays off when it translates into less scrap, shorter changeover times, no surface preparation operations, or the possibility of using thinner material for the same product function. If none of these effects occurs, hot-rolled or pickled material does the same job at a lower cost.
Selection criteria in production practice
Thickness. Below 1.5 mm the choice comes down to a cold-rolled product. Above 3 mm to a hot-rolled one, possibly pickled.
Required tolerance. Processes sensitive to thickness variations, such as resistance welding in an automated cycle or precision pressing, favour cold-rolled material, and where sensitivity is high, restricted tolerances.
Surface quality. Products painted without additional preparation and visible parts require a cold-rolled surface. Concealed parts and parts painted after blasting do not.
Drawing depth. It determines the choice of grade within the DC or DD series and, for the most demanding shapes, in practice the choice of cold-rolled material.
Welding. Mill scale worsens the conditions for automated welding. In manual welding after edge cleaning it is not a problem.
Total cost. What counts is not the price per tonne, but the cost of the finished part including scrap, preparation operations and the risk of rejects.
Available steel grades, coating types and formats of coils, slit strip and sheets are presented in the HEN-STOL steel sheet offer, with separate pages for galvanized steel sheet, cold-rolled steel sheet and hot-rolled steel sheet.
See how we can help
HEN-STOL helps match process requirements with what is available on the market and indicates when cold-rolled material is a necessity and when pickled sheet will do the same job at a lower cost. Send us the specification and a description of the application, and we will check availability and propose the most favourable option.
Frequently asked questions
What is the difference between hot-rolled and cold-rolled steel sheet?
The process temperature and its consequences. Hot rolling takes place above the recrystallisation temperature and produces a product with wider tolerances and a surface covered in mill scale. Cold rolling is carried out at ambient temperature and gives tighter tolerances, better flatness and a smooth surface, at the cost of additional operations.
Which sheet has tighter thickness tolerances?
Cold-rolled sheet. At a thickness of 2 mm and a width of up to 1200 mm, the tolerance is ±0.10 mm compared with ±0.17 mm for a hot-rolled product, i.e. around 40 per cent tighter.
Up to what thickness is cold-rolled sheet produced?
EN 10130 covers the range from 0.3 to 3.0 mm. Above this thickness, hot-rolled products are used, as rolled or pickled.
What do the grades DC01 and DC04 mean?
They are cold formability grades to EN 10130. DC01 is intended for bending and simple forming, DC04 for deep drawing, with higher requirements for elongation and for the r90 and n90 coefficients.
When is pickled and oiled sheet worth choosing?
When a clean, scale-free surface is needed at a thickness beyond the range of cold-rolled products, especially for cold forming, automated welding and painting.
How large is the price difference between these products?
In September 2026, European quotations showed a difference of around EUR 120-130 per tonne in favour of the hot-rolled product. It corresponds to the cost of the additional process operations.
Sources
- EN 10130, Cold rolled low carbon steel flat products for cold forming
- EN 10111, Continuously hot rolled low carbon steel sheet and strip for cold forming
- EN 10025-2, Hot rolled products of structural steels - non-alloy structural steels
- EN 10051 and EN 10131, tolerances on dimensions and shape of flat products
- ArcelorMittal, catalogue B10, Steels for cold forming, and catalogue A10 to EN 10111
- Kallanish, flat product price quotations in Europe, September 2026