Patent ID: 6562153
Filing Date: 2003-05-13
Classification: C21D,C22C,F16G

Abstract:
A power transmission belt in combination with a continuously variable transmission, said power transmission belt comprising a base material made of a strain-induced martensitic steel consisting essentially, by mass, of 0.01 to 0.10% carbon, not more than 3.0% silicon, more than 5.0 but not more than 10.0% manganese, 1.0 to 12.0% nickel, 4 to 18% chromium, Mo and optional W in an amount of 0.1 to 4.0% in total in terms of Mo+1/2 W; from 0 inclusive but not more than 5.0% copper, from 0 inclusive but not more than 0.15% nitrogen, not more than 0.10% aluminum, not more than 0.005% oxygen, and the balance substantially iron, said strain-induced martensitic steel having an â€œAâ€  value, which is defined byâ€œAâ€ =Ni+0.65Cr+0.98Mo+0.49W+1.05Mn+0.35Si+Cu+12.6(C+N)â€ƒâ€ƒ(1) with a proviso that any element which is not added is calculated as zero, in a range of 13 to 25%, said steel containing in austenite a martensite phase of not less than 30 volume % after cold working and wherein the said power transmission belt has a fatigue strength of not less than 800 MPa.