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TABLE 1–13 Chemical composition and mechanical properties of alloy steelsÃÃ Percent Mn 590–740 690–840 590–740 690–840 590–740 690–840 790–940 890–1040 0.20– 0.35 690–840 790–940 890–1040 990–1140 790–940 890–1040 | TABLE 1-13 Chemical composition and mechanical properties of alloy steels Downloaded from Digital Engineering Library @ McGraw-Hill www.digitalengineeringlibrary.com Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Percent Designation C Si Mn Ni Cr Mo V Al 20 C 15 20 Mn 2 0.16- 0.24 0.10- 0.35 1.30- 1.70 27 C 15 27 Mn 2 0.22- 0.32 0.10- 0.35 1.30- 1.70 37 C 15 37 Mn 2 0.32- 0.42 0.10- 0.35 1.30- 1.70 35 Mn 6 Mo 3 35 Mn 2 Mo 28 0.30- 0.40 0.10- 0.35 1.30- 1.80 0.20- 0.35 35 Mn 6 Mo 4 35 Mn 2 Mo 45 0.30- 0.40 0.10- 0.35 1.30- 1.80 0.35- 0.55 40 Cr 4 40 Cr 1 0.35- 0.45 0.10- 0.35 0.60- 0.90 0.90- 1.20 40 Cr 4 Mo 2 40 Cr 1 Mo 28 0.35- 0.45 0.10- 0.35 0.50- 0.80 0.90- 1.20 0.20- 0.35 15 Cr 13 Mo 6 15 Cr 3 Mo 55 0.10- 0.20 0.10- 0.35 0.40- 0.30 0.70 max 2.90- 3.40 0.45- 0.65 25 Cr 13 Mo 6 25 Cr 3 Mo 55 0.20- 0.30 0.10- 0.35 0.40- 0.30 0.70 max 2.90- 3.40 0.45- 0.65 Tensile strength rst 0.2 proof stress min r . 7 ay Minimum elongation gauge length 5.65 vT a Minimum Izod impact value Brinell hardness hb Limiting ruling section mm in MPa kpsi MPa kpsi J ft-lbf 590-740 85.6-107.3 390 56.6 18 48 35.4 170-217 63 2.5 690-840 100.0-121.8 450 65.3 16 48 35.4 201-248 30 1.2 590-740 85.5-107.3 390 56.6 18 48 35.4 170-217 100 4.0 690-840 100.0-121.8 450 65.3 16 48 35.4 201-248 63 2.5 590-740 85.5-107.3 390 56.6 18 48 35.4 170-217 150 6.0 690-840 100.0-121.8 490 71.1 18 48 35.4 201-248 100 4.0 790-940 114.6-136.3 550 79.9 16 48 35.4 229-277 30 1.2 890-1040 129.0-150.8 650 94.3 15 41 30.2 255-311 15 0.6 690-840 100.0-121.8 490 71.1 14 55 40.6 201-248 150 6.0 790-940 114.6-136.3 550 79.8 12 50 36.8 229-277 100 4.0 890-1040 129.0-150.8 650 94.3 12 50 36.8 255-311 63 2.5 990-1140 143.6-165.3 750 108.8 10 48 35.4 285-341 30 1.2 790-940 114.6-136.3 550 79.8 16 55 40.6 229-277 150 6.0 890-1040 129.0-150.8 650 94.3 15 55 40.6 255-311 100 4.0 990-1140 143.6-165.3 750 108.9 13 48 35.4 285-341 63 2.5 690-840 .
