Gray Relational Optimization of the Surface Performance of Splines Formed by Cold Roll-Beating

Table 1

The chemical composition of 20 steel (mass fraction, %).

C	Si	Mn	P	S	Ni	Cr
0.20	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.30	≤0.25