Better surfaces and less scrap

Thanks to new mathematical models SSAB has increased the quality of its steel. Swerim has conducted a project for developing the models that are used to optimise continuous casting and to determine if and when certain surface defects occur. 

Cracks degrade steel quality

Continuous casting is a method used in the production of steel. The molten steel is poured into a casting mould where a hardened shell is formed. It fully solidifies thereafter as it is drawn along a water-cooled mould. During casting, various types of cracks commonly occur, which leads to degraded steel quality and adverse effects on productivity. Achieving a balance between among other things, casting speed, impact properties and the dimensions of the steel is a must for casting without surface defects.

Simulations help avoid cracks

With the help of the models, it can be determined how these parameters affect castings and when surface defects occur. This knowledge is important and contributes to increased steel quality. Swerim has also conducted tests in a continuous casting simulator and the results have subsequently been confirmed with actual tests in industry.

“For SSAB’s part, it has been a very rewarding partnership that has produced valuable results,” says Christer Nilsson, senior specialist for continuous casting at SSAB in Luleå.

“These have been implemented in practice at our continuous casting mill in Luleå and we have achieved benefits and savings in the form of better quality and reduced scrap volumes.”