PRODUCTION METHOD OF BELT FOR STAINLESS STEEL CONTINUOUSLY VARIABLE TRANSMISSION BELT

摘要

When a metastable austenitic stainless steel strip with a value Md(N), which is calculated from a composition, of 20-100 is ring-rolled to a steel belt, the relationship of -0.3913T+0.5650Md(N)+60.46 epsilon ≥ 65.87 is established among a material temperature T, an equivalent strain epsilon and the value Md(N). Due to the controlled rolling, a stainless steel belt for a continuously variable transmission is bestowed with fatigue properties similar or superior to those of a 18%-Ni maraging steel belt. The value Md(N) is defined by the equation of Md(N)=580-520C-2Si-16Mn-16Cr-23Ni-300N-10Mo, and the equivalent strain epsilon is defined by the equation of epsilon = <SQRT>4(ln(1 - R))<2> /3</SQRT> (R: reduction). Furthermore, the steel belt is stabilized in its quality and profile by confining a variation DELTA T of the material temperature T within a range of +/-6.4 DEG C. <IMAGE>