[Retracted] Study of Surface Roughness of Cutting Isothermally Hardened Ductile Iron in Tosa Knife Forging Technique Based on Intelligent Calculation

Table 1

Chemical composition of the specimens before heat treatment (%).

3.1–3.9

2.0–3.0

≤0.4

≤0.10

≤0.03

≥0.02

≥0.02

≤0.05

≤0.004