Rolled and forged ringsfrom Ovako

Rings are vital components in many types of industries. It is therefore crucial to have a dedicatedsupplier in this area. For this reason, Ovako considers it very important to be a dedicated supplierand to focus on producing high quality rings as a priority business. This approach has made us

a leading producer of rolled rings.

Ovako has long experience with seamless rolled rings, cylindrical or profiled geometry very closeto the final shape of the finished component.

Our reputation for precision is well earned, whether it concerns the physical geometry of the ringor the composition and homogeneity of the steel. Our production capacity is about 2 million rings

per year, equivalent to about 30,000 tonnes of steel.

The bulk of our production is consumed by the rolling bearing industry, but a substantial shareis also delivered to customers in other industrial segments, such as the heavy vehicle, automotive

and machine tool manufacturing industries.

The dimensional range is 150-2,500 mm and the weight range is 5-2,500 kg.

Forged rings are also supplied up to 3,500 kg.

Rings to meet the industry’s needs

Size rangeRings are made in three different ring mills andone forging press. Outline production data isgiven in the table below:

Ring mill Type Outer diameter, Max ring height*, Weight,mm mm kg

8 radial rolling mill 150- 330 125 5- 23

4 axial/radial rolling mill 250- 750 230 18- 85

9 axial/radial rolling mill 335-2,500 550 75-2,500

Press 6 forging press 350-2,200 - -3,500

* Max height = As rolled height, lower heights may be achieved by parting off rolled rings.

Ovako can manufacture virtually any profile shape required. Where the shape is based on the customer productsshape, there is an additional, comparably small machining allowance.

In most cases we can roll rings with verysmall allowances and tight tolerances closeto the final shape of your product.

Some examples of typical profiles are shownbelow. The specalist will very quickly seethat this representative sample offers inter-esting solutions for many manufacturingpossibilities. Near-net-shaped rings offerthe buyer a total cost that is substantiallyless than other conventional methods ofproduction.

A near-net-shaped ring can be up to 50 percent lighter than a cylindrical equivalent,while at the same time reducing machining

time and a significant reduction in wastethrough lower volume, chip production andhandling. Some surfaces may even require nofurther machining at all.

They also demonstrate the specialist know-howthat Ovako has that few other manufacturerscan match.

Whatever you need, we can deliver!

A close profile meansless machining

Minimum order quantities

Ring mill Size range, Minimum quantity,mm OD pcs

8 150- 380 200

4 220- 750 10

9 350-3,050 1

Press 6 350-2,200 1

Logistics (material flow)

Capacity booking system

To ensure the highest level of customer service,Ovako offers customers the opportunity of reservingcapacity in advance in our production system. Thesereservations are made monthly for every producttype, on a rolling forecast basis, to cover thefollowing six months. Customers using this systemare expected to forecast accurately and take thecapacity that they have reserved.

Lead times

Our nominal lead times are relatively short whenbench-marked against our competitors, andalthough they may vary depending on the overallcapacity utilisation of our rolling mills, Ovakoattempt to offer a better delivery service by settingtargets to continuously reduce lead times whateverthe external market conditions.

Nominal lead times

The nominal lead time for rolled rings, exmill, is 4-6calender weeks. However, this is just indicative anddependent on the steel grade, processes involvedand actual capacity utilisation. Please contact us toobtain an accurate lead time for a specific productat the time of order. Alternatives with shorter leadtimes, such as the creation of a specific inventory

of finished products ear-marked for an individualcustomer, or obtaining supplies from an inter-mediate inventory, can be arranged subject toa separate agreement.

Heat treatmentRings are supplied in the following conditions orcombinations thereof:

• Normalised.

• Soft annealed.

• Stress relieved.

• Isothermally annealed.

• Quenched and tempered.

• Controlled cooled.

MachiningSemi-finished or finished machined rings canbe supplied according to individual customerrequirements.

Shot blast finishOvako can offer shot blasted rings of diametersup to 1,250 mm and 500 kg.

Final inspectionAll finished rings are inspected for surface defects,discrepancies in inner and outer diameter, width,height, conicity, ovality and squareness. Muchof this is done by an inline inspection system.

EN BS SAE DIN W.Stoff AFNOR SS

Through-hardening bearing steelsOvako 803 100Cr6 534A99 52100 100Cr6 1.3505 100C6 2258Ovako 824 100CrMo7 100CrMo7 1.3537 100CD6Ovako 825B 100CrMo7-3 100CrMo7-3 1.3536Ovako 826B 100CrMo7-4 100CrMo7-4 1.3538Ovako 827B 100CrMnMo8 100CrMnMo8 1.3539Ovako 831B 100CrMnSi4-4 100CrMnSi4-4 1.3518Ovako 837B 100CrMn6 100CrMn6

High-strength low alloyed steelsOvako 280 E 470 17MnV6 20MV6Ovako 281 E 470 20MnV6 20MV6Ovako 285/520 E 355 150M19 1518 St 52-3 20M5 2172

Case-hardening steelsOvako 146 18NiCr5-4 637M17 18NiCr-4 20NC6 2512Ovako 152 20NiCrMo4 805M20 8620 21NiCrMo2 1.6523 15NCD2 2506Ovako 234 16MnCr5 16MnCr5 1.7131 16MC5 2127

Hardening and tempering steelsOvako 047 C45E 080M46 1045 Ck45 1.1191 XC45 1672Ovako 322 25CrMo4 4130 25CrMo4 1.7218 25CD4 2225Ovako 323 34CrMo4 708A37 4135 34CrMo4 1.7220 35CD4 2234Ovako 326/327 42CrMo4 709M40 4140 42CrMo4 1.7225 42CD4 2244Ovako 356 34CrNiMo6 817M40 4337 34CrNiMo6 1.6582 35NCD6 2541

Standard steel grades (examples)

In this chart you will find the steel designations ofOvako, and equivalent international designations.An exact comparison is often difficult to make,

Delivery executionPackaging

As standard, the rings are delivered strapped onpallets. The number of rings on each pallet can bespecified by the customer, but within the physicallimitations of the pallet. The maximum height ofthe pallet is 1 metre and maximum weight is1,000 kg. Shot blasted rings are usually deliveredwith plastic wrapping around the pallet.

Marking

Material delivered direct from our mill is labelledin accordance with the Odette standard.

The standard information, some of which isbar-coded, is:

• Customer’s name, address, purchase order andpart number.

• Ovako’s name, serial number and suppliersorder number.

• Steel grade and heat number.

• Weight.

• Number of pieces.

Customer-specific data can be added on request.

the examples shown should therefore be consideredas a guideline only.

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©Cop

yright

Ovako

2007

Ovako is a leading European producer of long

special steel products for the rolling bearing, heavy

vehicle, automotive and engineering industries.

Production consists of low alloy and carbon steels

in the form of bars, wire rod and drawn wire,

tubes, rings and pre-components.

The company has 16 production sites and several

sales companies in Europe and the USA.

Total steel production is 2 million tonnes.

SALES OFFICES:

France:

Ovako France S.A.S.

14, rue de Mirande

21000 Dijon

Tel.: 03 80 54 15 15

Fax: 03 80 50 14 67

Germany/Austria:

Ovako GmbH

Postfach 1255

40672 Erkrath

Tel.: 0211-2504-0

Fax: 0211-2504-244

Italy: (served through)

Sandvik Italia S.p.A.

Divisione Acciai

Via Varesina 184

20156 Milano

Tel.: 02 30 70 51

Fax: 02 30 70 54 80

United Kingdom:

Ovako Ltd.

Unit 2, Britannia Park

Trident Drive

Wednesbury WS10 7XA

Tel.: 0121 502 1010

Fax: 0121 505 0019

USA:

Ovako North America, Inc.

1096 Assembly Drive

Suite 312

Fort Mill, SC 29708

Tel.: 803-802-1500

Fax: 803-802-1501

MANUFACTURING:

Ovako Steel AB

Tube and Ring Division

SE-813 82 Hofors

Sweden

Tel.: +46 290 250 00

Fax: +46 290 250 25

www.ovako.com