EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned
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EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned introduction

The cold-upsettable steel 28 B 2 can be cold-formed with a medium to high rate of forming according to the usual forming methods on single-stage and multi-stage presses. It is used for Phillips screws of strength class 8.8 in the thick and medium dimension range and for nuts of strength classes 8 and 10.

Equivalent material: ISO E4, DIN 1.5510, JIS SWRCHB226, JIS SWRCHB231, EN 28B2, EN 1.5510

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned general

Property Temperature Value
Density 20.0 °C Density of 7.82 g/cm³

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned thermal

Property Temperature Value Comment
Coefficient of thermal expansion -100.0 °C Coefficient of thermal expansion of 1.08E-5 1/K -
- 20.0 °C Coefficient of thermal expansion of 1.19E-5 1/K -
- 100.0 °C Coefficient of thermal expansion of 1.25E-5 1/K -
- 200.0 °C Coefficient of thermal expansion of 1.3E-5 1/K -
- 300.0 °C Coefficient of thermal expansion of 1.36E-5 1/K -
- 400.0 °C Coefficient of thermal expansion of 1.41E-5 1/K -
- 500.0 °C Coefficient of thermal expansion of 1.45E-5 1/K -
- 600.0 °C Coefficient of thermal expansion of 1.49E-5 1/K -
Max service temperature - Max service temperature of 500 °C Typical for Carbon Steel
Melting point - Melting point of 1480 - 1526 °C Typical for Low Carbon Steel
Specific heat capacity -100.0 °C Specific heat capacity of 423 J/(kg·K) -
- 20.0 °C Specific heat capacity of 461 J/(kg·K) -
- 100.0 °C Specific heat capacity of 479 J/(kg·K) -
- 200.0 °C Specific heat capacity of 499 J/(kg·K) -
- 300.0 °C Specific heat capacity of 517 J/(kg·K) -
- 400.0 °C Specific heat capacity of 536 J/(kg·K) -
- 500.0 °C Specific heat capacity of 558 J/(kg·K) -
- 600.0 °C Specific heat capacity of 587 J/(kg·K) -
Thermal conductivity 20.0 °C Thermal conductivity of 48 W/(m·K) -
- 100.0 °C Thermal conductivity of 48.9 W/(m·K) -
- 200.0 °C Thermal conductivity of 47.5 W/(m·K) -
- 300.0 °C Thermal conductivity of 44.7 W/(m·K) -
- 400.0 °C Thermal conductivity of 41.6 W/(m·K) -
- 500.0 °C Thermal conductivity of 38.6 W/(m·K) -
- 600.0 °C Thermal conductivity of 35.5 W/(m·K) -
Thermal diffusivity 20.0 °C Thermal diffusivity of 13.3 mm²/s -
- 100.0 °C Thermal diffusivity of 12.6 mm²/s -
- 200.0 °C Thermal diffusivity of 11.5 mm²/s -
- 300.0 °C Thermal diffusivity of 10.2 mm²/s -
- 400.0 °C Thermal diffusivity of 8.9 mm²/s -
- 500.0 °C Thermal diffusivity of 7.5 mm²/s -
- 600.0 °C Thermal diffusivity of 6 mm²/s -

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned chemical

Property Value
Boron Boron of 1E-3 - 5E-3 %
Carbon Carbon of 0.25 - 0.32 %
Manganese Manganese of 0.5 - 0.8 %
Phosphorus Phosphorus of 0.04 %
Silicon Silicon of 0.4 %
Sulfur Sulfur of 0.035 %

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned magnetic

Property Value Comment
Curie temperature Curie temperature of 770 °C Typical for Low Carbon Steel

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned electrical

Property Temperature Value
Electrical resistivity 20.0 °C Electrical resistivity of 2.17E-7 Ω·m
- 100.0 °C Electrical resistivity of 2.62E-7 Ω·m
- 200.0 °C Electrical resistivity of 3.32E-7 Ω·m
- 300.0 °C Electrical resistivity of 4.2E-7 Ω·m
- 400.0 °C Electrical resistivity of 5.23E-7 Ω·m
- 500.0 °C Electrical resistivity of 6.41E-7 Ω·m
- 600.0 °C Electrical resistivity of 7.8E-7 Ω·m

EN 10263-4 Grade 28B2 annealed to achieve spheroidized carbides and turned mechanical

Property Temperature Value Comment
Elastic modulus -100.0 °C Elastic modulus of 217 GPa -
- 20.0 °C Elastic modulus of 212 GPa -
- 100.0 °C Elastic modulus of 207 GPa -
- 200.0 °C Elastic modulus of 199 GPa -
- 300.0 °C Elastic modulus of 192 GPa -
- 400.0 °C Elastic modulus of 184 GPa -
- 500.0 °C Elastic modulus of 175 GPa -
- 600.0 °C Elastic modulus of 164 GPa -
Poisson's ratio 23.0 °C Poisson's ratio of 0.29 [-] Typical for Low Carbon Steel
Reduction of area 20.0 °C Reduction of area of 62 % -
Shear modulus 23.0 °C Shear modulus of 82 GPa Typical for Low Carbon Steel
Tensile strength 20.0 °C Tensile strength of 540 MPa -

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