In December 2006, yingkou jinlong refractories group (include the following, branch: yingkou guang Yang refractory material co., LTD., yingkou kyushu refractories co., LTD, dashiqiao jinlong refractories co., LTD.) steel company brand magnesia carbon brick was the state administration of quality supervision, inspection and quarantine of the People's Republic of China awarded the quality of the products exempted from inspection certificate.