Standard hot-rolled round bars are delivered in diameters from 13 mm to Ø 230 mm and are available in many different sizes. They can be delivered at 1 mm intervals up to Ø 75 mm. Larger dimensions are available at 5 mm intervals. The tolerances on dimensions and shape for round bars meet the European standard EN 10060. Our rolling mills have excellent capability to produce tighter tolerances, including half the standard tolerance.
If not otherwise specified, the manufacturing length is 6,000 mm. Depending on the producing rolling mill, the length ranges between 3.5 and 18 metres. Bar diameter, heat treatment and yield optimisation may result in a deviation from this common length. Ten per cent of the bars may be below the minimum of the ordered range, but not less than 3 metres. At the time of the order, bars can be delivered sawn to exact lengths.
Out of roundness is measured as the difference between the maximum and minimum diameters, and it is at most two-thirds of the diameter tolerance. Straightness is measured as the maximum height of arch; in other words, the largest deviation from the straight line. Normally the test length is 1.0 metre. Normal straightness is a maximum of 2 mm/m.
Standard surface crack depth is maximum 1 percent of the diameter. When an order is made, the bars can be inspected, for example, by magnetic dispersion or the magnetic particle method. Normally, surface quality class D can be achieved for diameters up to Ø 80 mm and class C for diameters up to Ø 120 mm, which comply with EN 10221.
Advantages of Ovako’s round bars
- Supreme quality with half the standard tolerance
- Ideally suited for forging and machining
- Broad supply of bars of many different sizes
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