Test roller No		SP1	SP2	SP3
Surface roughness, μm	Ra	0.23	0.84	1.29
Surface roughness, μm	Rz	2.10	6.05	8.90
Surface residual stress, MPa		−1307	−1079	−1178
Test roller No		SP4	NP5	NP6
Surface roughness, μm	Ra	2.05	0.07	0.49
Surface roughness, μm	Rz	14.80	0.59	1.78
Surface residual stress, MPa		−1047	−1060	−586
Test roller No		NP7
Surface roughness, μm	Ra	1.10
Surface roughness, μm	Rz	4.26
Surface residual stress, MPa		-401