| abstract |
A steel sheet for disk brake with improved anti-warp property has a chemical composition comprising, in mass percent, 0.05-0.15% of C, not more than 1.0% of Si, not more than 2.0% of Mn, not more than 1.0% of Ni, 9.0-15.0% of Cr, 0.5-4.0% of Cu, 0.10-2.0% of Mo, not more than 0.10% of N, 0.05-1.0% of Nb, and the balance of Fe and unavoidable impurities and having a gamma max value defined by: gamma max=420C+470N+23Ni+7Mn+9Cu-11.5Cr-11.5Si-12Mo-3.5Nb+189 of not less than 80. A brake disk obtained from the steel sheet keeps disk periphery warp height within 0.3 mm when the disk is subjected to 500 cycles of repeated heating/cooling each consisting of temperature increase at a rate of 5-20 DEG C/sec up to 600 DEG C -> maintaining at 600 DEG C during 10 sec -> water cooling. |