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 brake disc steel for a vehicle having excellent wear resistance and high temperature strength, and a method for manufacturing the same. In one embodiment of the present invention, by 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 ( 0 is excluded), 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 excluded), titanium (Ti): 0.02% or less (excluding 0), niobium (Nb): 0.05% or less (excluding 0), calcium (Ca): contains 2 to 100 ppm, the balance of Fe and other unavoidable impurities It includes, and satisfies the following relations 1 and 2, the microstructure is an area%, 90% or more of martensite and 10% or less of bainite, a brake disc steel material for a vehicle having excellent wear resistance and high temperature strength and its manufacturing Provides a method. [Relationship 1] 260 ≤ 1589 × [C] + 228 ≤ 340 [Relationship 2] [C]/[Mo] ≤ 0.250 (However, [C] and [Mo] in relations 1 and 2 are weight%.)