997. Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel. September 6, 2025 by Admin A. 0.01 to 0.10 B. 0.2 to 0.4 C. 0.5 to 0.7 D. 0.8 to 1.0 ✅ The correct answer is option B.