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AISI 1040 Steel, oil quenched from 855°C (1570°F), 595°C (1100°F) temper, 25 mm (1 in.) round
Categories: Metal; Ferrous Metal; Carbon Steel; AISI 1000 Series Steel; Medium Carbon Steel
Material Notes: Typical uses include machine, plow, and carriage bolts, tie wire, cylinder head studs, and machined parts, U-bolts, concrete reinforcing rods, forgings, and non-critical springs. Post oil quenched hardness: 23 HRC surface, 21 HRC half-radius, 18 HRC center.
Key Words: UNS G10400, ASTM A29, ASTM A108, ASTM A510, ASTM A519, ASTM A546, ASTM A576, ASTM A682, MIL SPEC MIL-S-11310 (CS1040), SAE J403, SAE J412, SAE J414, DIN 1.1186, JIS S 40 C, BS 970 060A40, BS 970 080A40, BS 970 080M40 (EN8), BS 2 S 93
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Physical PropertiesMetricEnglishComments
Density 7.845 g/cc0.2834 lb/in³Chemical composition of 0.435% C, 0.69% Mn, 0.20% Si, annealed at 860°C (1580°F).
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 187187
Hardness, Knoop 209209Converted from Brinell
Hardness, Rockwell B 9090Converted from Brinell
Hardness, Rockwell C 1010Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers 196196Converted from Brinell
Tensile Strength, Ultimate 631 MPa91500 psi
Tensile Strength, Yield 443 MPa64300 psi
Elongation at Break 28.2 %28.2 %in 50 mm
Reduction of Area 63.5 %63.5 %
Modulus of Elasticity 200 GPa29000 ksiTypical for steel
Bulk Modulus 160 GPa23200 ksiTypical for steels
Poissons Ratio 0.290.29Typical For Steel
Shear Modulus 80.0 GPa11600 ksiTypical for steels
Izod Impact 45.0 J33.2 ft-lbannealed at 790°C (1450°F)
 49.0 J36.1 ft-lbas rolled
 65.0 J47.9 ft-lbnormalized at 900°C (1650°F)
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity  0.0000171 ohm-cm
@Temperature 20.0 °C		0.0000171 ohm-cm
@Temperature 68.0 °F
 0.0000221 ohm-cm
@Temperature 100 °C		0.0000221 ohm-cm
@Temperature 212 °F
 0.0000296 ohm-cm
@Temperature 200 °C		0.0000296 ohm-cm
@Temperature 392 °F
 0.0000493 ohm-cm
@Temperature 400 °C		0.0000493 ohm-cm
@Temperature 752 °F
 0.0000763 ohm-cm
@Temperature 600 °C		0.0000763 ohm-cm
@Temperature 1110 °F
 0.0000932 ohm-cm
@Temperature 700 °C		0.0000932 ohm-cm
@Temperature 1290 °F
 0.0001111 ohm-cm
@Temperature 800 °C		0.0001111 ohm-cm
@Temperature 1470 °F
 0.0001149 ohm-cm
@Temperature 900 °C		0.0001149 ohm-cm
@Temperature 1650 °F
 0.0001179 ohm-cm
@Temperature 1000 °C		0.0001179 ohm-cm
@Temperature 1830 °F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  11.3 µm/m-°C
@Temperature 20.0 - 100 °C		6.28 µin/in-°F
@Temperature 68.0 - 212 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu.
 12.1 µm/m-°C
@Temperature 20.0 - 200 °C		6.72 µin/in-°F
@Temperature 68.0 - 392 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu.
 12.2 µm/m-°C
@Temperature 20.0 - 300 °C		6.78 µin/in-°F
@Temperature 68.0 - 572 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu
 13.3 µm/m-°C
@Temperature 20.0 - 400 °C		7.39 µin/in-°F
@Temperature 68.0 - 752 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu
 13.9 µm/m-°C
@Temperature 20.0 - 500 °C		7.72 µin/in-°F
@Temperature 68.0 - 932 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu
 14.2 µm/m-°C
@Temperature 20.0 - 600 °C		7.89 µin/in-°F
@Temperature 68.0 - 1110 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu
 14.8 µm/m-°C
@Temperature 20.0 - 700 °C		8.22 µin/in-°F
@Temperature 68.0 - 1290 °F		Composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu
Specific Heat Capacity  0.486 J/g-°C
@Temperature >=100 °C		0.116 BTU/lb-°F
@Temperature >=212 °F
 0.515 J/g-°C
@Temperature 150 - 200 °C		0.123 BTU/lb-°F
@Temperature 302 - 392 °F
 0.528 J/g-°C
@Temperature 200 - 250 °C		0.126 BTU/lb-°F
@Temperature 392 - 482 °F
 0.548 J/g-°C
@Temperature 250 - 300 °C		0.131 BTU/lb-°F
@Temperature 482 - 572 °F
 0.569 J/g-°C
@Temperature 300 - 350 °C		0.136 BTU/lb-°F
@Temperature 572 - 662 °F
 0.586 J/g-°C
@Temperature 350 - 400 °C		0.140 BTU/lb-°F
@Temperature 662 - 752 °F
 0.624 J/g-°C
@Temperature 750 - 800 °C		0.149 BTU/lb-°F
@Temperature 1380 - 1470 °F
 0.649 J/g-°C
@Temperature 450 - 500 °C		0.155 BTU/lb-°F
@Temperature 842 - 932 °F
 0.708 J/g-°C
@Temperature 550 - 600 °C		0.169 BTU/lb-°F
@Temperature 1020 - 1110 °F
 0.770 J/g-°C
@Temperature 650 - 700 °C		0.184 BTU/lb-°F
@Temperature 1200 - 1290 °F
 1.583 J/g-°C
@Temperature 700 - 750 °C		0.3783 BTU/lb-°F
@Temperature 1290 - 1380 °F
Thermal Conductivity  24.7 W/m-K
@Temperature 800 °C		171 BTU-in/hr-ft²-°F
@Temperature 1470 °F
 29.8 W/m-K
@Temperature 1200 °C		207 BTU-in/hr-ft²-°F
@Temperature 2190 °F
 30.1 W/m-K
@Temperature 700 °C		209 BTU-in/hr-ft²-°F
@Temperature 1290 °F
 32.9 W/m-K
@Temperature 1000 °C		228 BTU-in/hr-ft²-°F
@Temperature 1830 °F
 33.9 W/m-K
@Temperature 600 °C		235 BTU-in/hr-ft²-°F
@Temperature 1110 °F
 38.2 W/m-K
@Temperature 500 °C		265 BTU-in/hr-ft²-°F
@Temperature 932 °F
 41.7 W/m-K
@Temperature 400 °C		289 BTU-in/hr-ft²-°F
@Temperature 752 °F
 45.7 W/m-K
@Temperature 300 °C		317 BTU-in/hr-ft²-°F
@Temperature 572 °F
 48.1 W/m-K
@Temperature 200 °C		334 BTU-in/hr-ft²-°F
@Temperature 392 °F
 50.7 W/m-K
@Temperature 100 °C		352 BTU-in/hr-ft²-°F
@Temperature 212 °F
 51.9 W/m-K
@Temperature 0.000 °C		360 BTU-in/hr-ft²-°F
@Temperature 32.0 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.37 - 0.44 %0.37 - 0.44 %
Iron, Fe 98.6 - 99 %98.6 - 99 %As remainder
Manganese, Mn 0.60 - 0.90 %0.60 - 0.90 %
Phosphorus, P <= 0.040 %<= 0.040 %
Sulfur, S <= 0.050 %<= 0.050 %

References for this datasheet.

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