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Table 9-1. Material Hardness (Use ratio of hardest particle/piston hardness for CH) MATERIAL HARDNESS MATERIAL (Hvx 106) Plain carbon steels - Low strength steel 140 - High strength steel 220 Low-alloy Steels -4320 640 -4340 560 Stainless Steels -303 170 -304 160 - 631 (17-7 PH hardened) 520 -631 (17-7 PH annealed) 170 - Austenitic AISI 201 annealed) 210 - Martensitic 440C (hardened) 635 -630 (17-4 PH hardened) 470 Nickel Alloys -201 100 Nickel-copper Alloys - Monel (annealed) 120 - Monel K-500 (annealed) 162 Ni-Cr-Mo-Fe Alloys - Inconnel 625 140 - Hastelloy 200 Aluminum -AISI 1100 (annealed) 25 -AISI 1100 (cold worked) 45 - AISI 2024 (annealed) 50 - AISI 2024 T4 (heat treated) 125 - AISI 6061 (annealed) 32 - AISI 6061 T6 (heat treated) 100 Actuators 9-16 Revision C

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