STEEL MATERIAL FOR BRAKE DISC OF MOTOR VEHICLE HAVING EXCELLENT WEAR RESISTANCE AND HIGH TEMPERATURE STRENGTH AND METHOD OF MANUFACTURING THE SAME

摘要

The present invention relates to a steel material for a vehicle brake disc having excellent wear resistance and high temperature strength, and a manufacturing method thereof. One embodiment of the present invention is in weight%, carbon (C): 0.02 to 0.07%, silicon (Si): 0.1 to 0.5%, manganese (Mn): 0.2 to 0.7%, phosphorus (P): 0.05% or less ( Excluding 0), Sulfur (S): 0.02% or less (excluding 0), Aluminum (Al): 0.07% or less (excluding 0), Chromium (Cr): 0.1 to 0.5%, Molybdenum (Mo): 0.3 to 1.0%, vanadium (V): 0.05% or less (excluding 0), boron (B): 50 ppm or less (excluding 0), nickel (Ni): 0.01 to 0.5%, copper (Cu): 0.5% or less (0 Silver), Titanium (Ti): 0.02% or less (excluding 0), Niobium (Nb): 0.05% or less (excluding 0), Calcium (Ca): Contains 2 to 100 ppm, balance Fe and other inevitable impurities It includes, and satisfies the following relational equations 1 and 2, and the microstructure is area%, including 90% or more martensite and 10% or less bainite, excellent abrasion resistance and high temperature strength steel for a vehicle brake disc and manufacture thereof Provides a way. [Relationship 1] 260 ≤ 1589×[C]+228 ≤ 340 [Relationship 2] [C]/[Mo] ≤ 0.250 (However, [C] and [Mo] in the above relational formulas 1 and 2 are weight percent.)