Potato harvester made of Hardox® wear steel helps farmers harvest success

26.10.2020 6 min luettu


Maa Turkki
Yritys Öz-Eliş
Teollisuusala Maa- ja metsätalous sekä kalastus

When Turkish agricultural machinery manufacturer Öz-Eliş wanted to improve the durability and service life of its new 4-row potato harvester, it turned to hard and tough Hardox® wear steel. The result? Machine parts with less deformation, fewer cracks and improved resistance to abrasion and wear – all using a thinner gauge of steel.

Hardox® wear steel is no stranger to the farm. It is highly resistant to extreme wear and abrasion and is through-hardened, meaning that the steel is hard from its outer layer right down to the core. This means that it can take a real beating in abrasive conditions, in fields filled with soil, sand and stones. As with Turkish manufacturer Öz-Eliş other companies have experienced success with Hardox® wear steel, in applications ranging from soil preparation, planting, harvesting and crop processing to bulk transport.

Interested in what Hardox® steel can do for your agri equipment – no strings attached! 

Harvester blades on a potato harvester in the field
Hardox® wear steel gives you peace of mind for acres after acres of potato harvesting


Maa Turkki
Yritys Öz-Eliş
Teollisuusala Maa- ja metsätalous sekä kalastus

High demand for staple crop behind company’s growth

Located near Turkey’s southern coast, Öz-Eliş was founded in the 1990s as a supplier of repair and maintenance services for agricultural machinery. According to Mustafa Hayta, the second-generation manager of the company, they started to produce potato harvesting machines in 2005 in response to strong market demand. Nowadays, 80% of their production is concentrated in this area.

The company produces a two-row harvester model with a width of 1.5 m (5 ft) and, more recently, a four-row model with a width of 3 m (9.8 ft). While the two-row model is the most widely sold on that market, the company was determined to manufacture a bigger and more efficient model. It began extensive R&D testing that finally led the way to Hardox® wear-resistant steel.

A sheet of Hardox® wear plate being machined
Hardox® is workshop-friendly and can be bent, welded and machined with standard workshop equipment.

How does a potato harvester work?

The Öz-Eliş potato harvester is mounted on the back of a tractor and has blades at the front of the harvester to remove the potatoes under the soil and convey them to a screening belt at the back. The potatoes roll on the round bars of the belt, which are placed as horizontal strips.

A four-row potato harvester with Hardox® wear steel in its blades
Öz-Eliş new four-row potato harvester does wonders for the farmers’ productivity.

Switches from mild steel to higher strength Hardox® wear steel

In 2005, Öz-Eliş was using heat-treated ST37 (S235) mild steel on the harvester blades in the front of the two-row harvester. Later, they began to use ST52 (S355) steel to overcome frequent bending, wear and fracture problems. However, the desired results could not be achieved.

“We tried ST52 (S235) steel and we even tried to strengthen the steel by applying heat treatment, but still could not prevent the problems we experienced,” Hayta says. He began doing some research and came across Hardox®. Together with SSAB, the company conducted studies to determine the best product and grade to be used in the blades.

Hayta continues, “We decided that the most suitable products for us were Hardox® 450 and Hardox® 500. In sandy soil, we started using Hardox® 500, which is more resistant to abrasion, while in hard soil we started using Hardox® 450, which has sufficient abrasion and higher impact resistance. Hardox® 500 worked almost three times more efficiently than the heat-treated ST52.”

More than doubles the potato harvester blade wear life

Thanks to the use of Hardox® wear steel, their challenges with wear, bending and cracks have disappeared. According to Hayta, the blades that offered 350 acres (17.5 hours) of service life in 10 mm (0.394 in.) thick ST52 can now offer 800 acres (40 hours) of service life with 8 mm (0.315 in.) thick Hardox® 500. 

“With the heat-treated ST52, we often experienced crack problems as well. This problem has disappeared with Hardox® thanks to its unique toughness,” he says.

Mustafa Hayta from Turkish manufacturer of potato harvesting equipment
Mustafa Hayta, manager of Öz-Eliş, is happy with the performance of Hardox® in the company’s new harvester.

Efficiency grows with a potato harvester design

The company decided to develop a four-row potato harvester to gain efficiencies using less machinery and manpower.

The harvesting belt of their two-row harvester was made by lining heat-treated 41CrMo4 mild steel bars 1.5 m (5 ft.) wide and 13 mm (0.512 in.) in diameter. The width of the four-row harvester had to be 3 meters, which required using steel bars 3 m long (9.8 ft) and 13 mm (0.512 in.) in diameter.

“At that time, it was not possible to supply steel bars in the length we needed in one piece with local heat-treated solutions. We used 41CrMo4 steels in two parts – but we didn’t get the result we wanted,” Hayta says. “Heat-treated mild steel had many problems. There were serious differences between the hardness in one area and in another area. Moreover, the high hardness was only true for the surface of the material. Hardness decreased even further as it went from surface to center. The toughness of the material also decreased due to the heat treatment. These shortcomings caused problems, such as rapid abrasion, bending, cracks and fractures.”

Steel round bars a success in screening belt

Despite a three-year search, Öz-Eliş could not find a solution for 3-meter-long (9 ft. 10 in.) steel bars. That’s when SSAB engineers came into the picture.

“We talked to SSAB about how we could solve this problem. Since there were no ready-made materials in the desired sizes, SSAB produced special solutions to support our R&D work,” Hayta says. Steel round bars, 3 m (9.8 ft) in length and 13 mm (0.512 in.) in thickness, were custom made and delivered to Öz-Eliş so they could finalize their R&D. Hayta and team were so thrilled that they headed right for the fields to assemble the bars, not even waiting to paint them.

Hardox® steel round bars being machined with ordinary machinery
Although Hardox® is hard, it is still able to be machined without any special machines.
Sharp, long-lasting, abrasion-resistant harvester blades in Hardox® wear steel
Hardox® wear steel stays sharp and effective even in fields with soil, sand and stones.

The result is a potato harvesting wonder

“We saw that the new machine did wonders – even in the first 10 meters (32 ft. 10 in.). Our three years of work finally began to bear fruit. All the farmers came to us and congratulated us. It was a great feeling!”

As Hayta continued testing, he realized what the material’s unique combination of hardness and toughness meant. “In the following stage, we also started to use Hardox® 400 steel bars in our two-row, 1.5 m (5 ft.) models and saw the wear life increase from 350 acres to 1,200 acres (2,400 acres in 4 rows). In addition, we’ve avoided the bending, cracking, breaking, and other problems we had before,” he says.

A longer service life keeps farmers happier and more productive

“Our biggest motivation is to satisfy farmers,” Hayta continues. “We make things easier for them and help them make a better profit. Farmers who don’t recognize Hardox steel are looking at the result, not the material we use. We can only show them how we improve our quality with Hardox® after the harvest is finished.”

Hayta also noted that market competitors are trying to compete on price. He confidently tells farmers who compare his company’s models with other competing machinery: ‘Take our product, and call us after 1,000 acres of harvest’ – a statement that squarely sets them apart from their competitors.

Hardox® wear steel plate
Switching to Hardox® wear steel was a great leap forward for Öz-Eliş, resulting in equipment both lighter and more durable.

More upgrades on the horizon for Öz-Eliş

Öz-Eliş is continuing its efforts to become even more successful in the production of potato harvesters. The company has two main goals for the near future: reduce weight by using Strenx® performance steel in the structural parts, and use Hardox® 500 Tuf, which provides the hardness of Hardox® 500 with the toughness of Hardox® 450 for stony soils where the impact risk is higher.

Hayta says that because of the lightness in the structural parts, farmers can use the harvester even as an attachment for smaller tractors. For this, they intend to focus on innovative design and materials and benefit from SSAB’s products and technical support.

Other innovations are also on the horizon. “We currently use Hardox® 500 in our harvester blades for sandy soils, but in some soils we encounter too many stones. We use Hardox® 450 to prevent damage from impact. To increase the wear life even further, we want to switch to a hardness of 500 BHN. So we’re going to experiment with Hardox® 500 Tuf. This way, in stony fields we’ll more easily fight both abrasion and cracking.”

Hardox 500 Tuf wear steel
The next step in the evolution of its potato harvesters is to introduce Hardox® 500 Tuf, delivering a unique combination of hardness and toughness.

 Old two-row design

Two-row upgraded 



 Steel used 

 Knife: ST52 heat treated
Bar: 41CrMo4 heat treated
 Knife: Hardox® 500
Bar: SSAB AR400 round bar
(Hardox® round bar
developmental product)
 Knife: Hardox® 500
Bar: SSAB AR400 round bar
(Hardox® round bar
developmental product)

 Knife service life

 350 acres – 17.5 hours
(20 acres / hour)
 800 acres – 40 hours  1600 acres – 40 hours

 Knife material thickness

 10 mm (0.394 in.)  8 mm (0.315 in.)  8 mm (0.315 in.)

 Round bar service life

 350 acres – 17.5 hours  1200 acres – 60 hours  2400 acres – 60 hours

 Round bar diameter

 13 mm (0.512 in.)
(Used until the thickness
reaches 8 mm/0.315 in.)
 13 mm (0.512 in.)
(Used until the thickness
reaches 8 mm/0.315 in.)
 13 mm (0.512 in.)
(Used until the thickness
reaches 8 mm/0.315 in.)

Properties of blades and round bars

Try Hardox® wear steel in your agricultural equipment

Find out how you can benefit from Hardox® in your farming operations. We’ll be happy to meet you in person and find out about your specific wear environment to find the best and most cost-effective solution for your business.
Tractor - agriculture equipment

Lisätietoa Hardox® 500 Tuf -teräksestä kauhoissa

Katso kuinka voit saada lisää kuormaa, säästää kunnossapitokustannuksissa ja pidentää käyttöikää.

Lataa WearCalc-sovellus

Laske, miten voit lisätä laitteistosi hyötykuormaa ja pidentää sen käyttöikää Hardox®-kulutuslevyn avulla.

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