Tham khảo tài liệu 'rules of thumb for mechanical engineers 2010 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Materials 265 Table 5 Nominal Composition of Classes of Tool Steels AISI USN c Mn Si Cr Ni Mo w V Air-hardening medium alloy cold work steels A3 T30103 max max Shock resistant steels S1 T41901 max max S5 T41905 max max max Low alloy special purpose tool steels L2 T61202 max max L6 T61206 max max Adapted from ASM Metals Handbook Vol. 1 9th Ed. 2 . Table 6 Typical Properties of Tool Steels After Indicated Heat Treatment Tensile Heat Treat strength Yield Strength koi Elongation in 50 mm Reduction in Area Hardness HRC Condition ksi L2 Annealed 103 74 25 50 96 HRB Oil quenched from 1 575 F and single tempered at 400 F 290 260 5 15 54 600 F 260 240 10 30 52 L6 Annealed 95 55 25 55 93 HRB Oil quenched from 1 550 F and single tempered at 600-F 290 260 4 9 54 800-F 230 200 8 20 46 S1 Annealed 100 60 24 52 96 HRB Oil quenched from 1 700 F and single tempered at 400 F 300 275 600 F 294 270 44 12 54 S5 Annealed 105 64 25 50 96 HRB Oil quenched from 1 600 F and single tempered at 400 F 340 280 5 20 58 600 F 325 270 7 24 58 Adapted from ASM Metals Handbook Vol. 1 9th Ed. 2 . Cast Iron Cast iron is a higher carbon containing iron-based alloy. A second structure involves heat-treating the gray cast iron Cast irons contain more than c by weight. They can to form spherodized cast iron. In this structure the damping be cast with a number of different microstructures. The most capacity is lost but the corrosion resistance is improved. common is gray cast ữon which has graphite flakes in a con- White iron is very brittle and is formed during cool-down tinuous three-dimensional structure which looks rather from the melt. It can be used as a wear-resistant surface if like potato chips. This .
