BOF Converters
The demands on the refactory lining have increased in parallel with converter process developments.
As a reliable partner of the steel industry, LWB has supported the development of the converter process with innovations in products and lining techniques and is one of the leading producers of basic products for the steel industry.
Binders for Carbon-Bonded Magnesia Bricks
New environmentally friendly binder systems, high-grade magnesia raw material and oxidation-resistant carbon carriers as well as new antioxidant systems are the raw components for our product lines, "KONMAG C" and "C-MAG C" converter refractories. Konmag C bricks are carbon-bonded tempered magnesia bricks with a residual carbon content of 5 %. C-Mag C bricks are carbon-bonded tempered magnesia-carbon bricks with a residual carbon content of 9 % to 17 %.
Pitch was found to be the best binder for MgO and MgO-C bricks in converter linings, but due to the high PAH content pitch binders became environmentally unacceptable. Therefore LWB Refractories, in close cooperation with the pitch supplier, succeeded in the development of a new environmentally friendly binder system.
This binder, called Carbores, now allows the production of carbon-bonded bricks with a much lower BaP content. Additionally, this new binder has all the positive characteristics of pitch. All bricks are tempered at about 300°C and enable lining preheating without emission problems.
Bottom Tuyères
Today, most LD converters incorporate bottom tuyères. LWB is able to line a converter bottom in one layer up to a thickness of 1,300 mm, ensuring high lining durability and tuyère availability. LWB also developed special manipulators for safe handling.
Taphole Systems
For the converter taphole system, LWB produces taphole sleeves from 90 to 350 mm diameter. The refractory material Konmag Tap 99/90 is based on highgrade fused magnesia and can be postimpregnated if required.
Monolithics
For the knuckle area, LWB supplies the ramming mix Magnerammix 979. It is based on the same high-grade raw material as our tuyère brick grade C-Mag C 240.
