Rogsons has mastered the production of Komatsu Crowns dozer (D 275, D 355) 195-78-21331. The crown is made of steel 27хгснмдтл in accordance with GOST 21357 - 87. Steel has been improved, against the requirements of the GOST, by applying a new generation of ferroalloys and modifiers, obtained by the svs method. So, after heat treatment, the hardness is Hrc 52 units. , and impact strength is 10-15% higher than analog, cold resistance up to -70 ° C.