M303 Chemical composition and Mechanical properties
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Component Elements Properties
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Metric
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English
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Comments
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Carbon, C
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0.270 %
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0.270 %
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Chromium, Cr
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14.5 %
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14.5 %
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Iron, Fe
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82.4 %
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82.4 %
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As Balance
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Manganese, Mn
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0.650 %
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0.650 %
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Molybdenum, Mo
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1.00 %
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1.00 %
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Nickel, Ni
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0.850 %
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0.850 %
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Silicon, Si
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0.300 %
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0.300 %
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Physical Properties
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Metric
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English
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Comments
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Density
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7.70 g/cc
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0.278 lb/in³
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Mechanical Properties
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Metric
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English
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Comments
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Hardness, Brinell
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290 - 330
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290 - 330
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as supplied; hardened and tempered
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Hardness, Rockwell C
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53.0
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53.0
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hardening at 1020°C; without tempering
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Modulus of Elasticity
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168 GPa
@Temperature 600 °C |
24400 ksi
@Temperature 1110 °F |
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181 GPa
@Temperature 500 °C |
26300 ksi
@Temperature 932 °F |
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191 GPa
@Temperature 400 °C |
27700 ksi
@Temperature 752 °F |
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200 GPa
@Temperature 300 °C |
29000 ksi
@Temperature 572 °F |
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207 GPa
@Temperature 200 °C |
30000 ksi
@Temperature 392 °F |
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214 GPa
@Temperature 100 °C |
31000 ksi
@Temperature 212 °F |
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218 GPa
@Temperature 20.0 °C |
31600 ksi
@Temperature 68.0 °F |
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