In a typical situation when hauling gravel or rocks, a harder plate will make the best choice when it comes to fighting wear. However, sometimes the load is corrosive in addition to being abrasive, making the picture much more complicated. The steel’s surface will start to oxidize in the presence of highly corrosive environments, and wear will increase several times over when the abrasive material wears on the oxide layer. Studies on wear in sea water have indicated that material loss can be up to 10 times higher. The level of corrosion depends on the temperature, type of acid, chlorides and surface roughness, among other parameters.
For several years, SSAB has been conducting research on wear corrosion and has developed a special steel grade more suitable for these environments, called Hardox® HiAce.
Hardox® HiAce has the same properties as Hardox® 450 but is specially designed to fight wear in corrosive environments, such as municipal waste management, waste in energy plants and in other industries that are sensitive to corrosion.
Read more about Hardox® HiAce.
To evaluate the performance of different Hardox® grades, SSAB conducted wear tests with the addition of acetic acids to simulate household waste and other acid abrasive materials. The testing equipment consists of a drum machine with a diameter of 800 mm (31.5”). The drum houses 34 individual samples.
The drum wear test machine for 34 individual samples.
Inside the drum.
The drum was loaded with abrasive materials and liquid, and the samples were weighed both before and after the test to measure the weight loss of each sample. The run time was around 90 hours and the abrasive material was changed twice a day.
The weight loss of all the samples was then recalculated in order to calculate service life relative to Hardox® 450.
Relative service life based on material loss in the test drum.
The information in this report is only applicable to SSAB’s products and should not be applied to any other products than original SSAB products.