ASTM A228 Steel (UNS K08500)
Categories: Metal; Ferrous Metal; ASTM Steel; Carbon Steel; High Carbon Steel
Material Notes: Cold drawn. High tensile strength and uniform mechanical properties. Music wire springs are not recommended for service temperatures above 121°C (250°F).

Applications: High quality springs and wire forms subject to high stresses or requiring good fatigue properties.
Key Words: spring steel, music wire, AMS 5112, UNS K08500
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Physical PropertiesMetricEnglishComments
Density 7.80 g/cc0.282 lb/in³Typical of ASTM Steel
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell C 41 - 6041 - 60
Tensile Strength, Yield  1590 - 1760 MPa
@Diameter 6.35 mm		231000 - 255000 psi
@Diameter 0.250 in
 1640 - 1820 MPa
@Diameter 5.26 mm		238000 - 264000 psi
@Diameter 0.207 in
 1690 - 1860 MPa
@Diameter 4.50 mm		245000 - 270000 psi
@Diameter 0.177 in
 1740 - 1920 MPa
@Diameter 3.81 mm		252000 - 278000 psi
@Diameter 0.150 in
 1770 - 1950 MPa
@Diameter 3.56 mm		257000 - 283000 psi
@Diameter 0.140 in
 1800 - 1990 MPa
@Diameter 3.18 mm		261000 - 289000 psi
@Diameter 0.125 in
 1870 - 2070 MPa
@Diameter 2.54 mm		271000 - 300000 psi
@Diameter 0.100 in
 1940 - 2150 MPa
@Diameter 2.00 mm		281000 - 312000 psi
@Diameter 0.0787 in
 2020 - 2230 MPa
@Diameter 1.60 mm		293000 - 323000 psi
@Diameter 0.0630 in
 2090 - 2310 MPa
@Diameter 1.30 mm		303000 - 335000 psi
@Diameter 0.0512 in
 2170 - 2410 MPa
@Diameter 1.00 mm		315000 - 350000 psi
@Diameter 0.0394 in
 2250 - 2490 MPa
@Diameter 0.810 mm		326000 - 361000 psi
@Diameter 0.0319 in
 2350 - 2600 MPa
@Diameter 0.610 mm		341000 - 377000 psi
@Diameter 0.0240 in
 2500 - 2760 MPa
@Diameter 0.400 mm		363000 - 400000 psi
@Diameter 0.0157 in
 2600 - 2880 MPa
@Diameter 0.300 mm		377000 - 418000 psi
@Diameter 0.0118 in
 2750 - 3040 MPa
@Diameter 0.200 mm		399000 - 441000 psi
@Diameter 0.00787 in
 3030 - 3340 MPa
@Diameter 0.100 mm		439000 - 484000 psi
@Diameter 0.00394 in
Modulus of Elasticity 210 GPa30500 ksi
Poissons Ratio 0.3130.313Calculated
Shear Modulus 80.0 GPa11600 ksi
 
Thermal PropertiesMetricEnglishComments
Maximum Service Temperature, Air 120 °C248 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.70 - 1.0 %0.70 - 1.0 %
Iron, Fe 97.8 - 99 %97.8 - 99 %
Manganese, Mn 0.20 - 0.60 %0.20 - 0.60 %
Phosphorus, P <= 0.025 %<= 0.025 %
Silicon, Si 0.10 - 0.30 %0.10 - 0.30 %
Sulfur, S <= 0.030 %<= 0.030 %

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