TAGS: DIN 1629 | steel grade | St 37.0 | Seamless steel pipe | steel pipe |
DIN 1629 Grade St 37.0 - Seamless Carbon Steel TubesIntroduction
DIN 1629 Grade St 37.0 is a standard specification for seamless carbon steel tubes used in various structural and mechanical applications. This grade falls under the DIN 1629 series, which covers different grades of non-alloy steel tubes.
The designation "St 37.0" indicates a structural carbon steel composition with a minimum yield strength of 235 megapascals (MPa). These seamless tubes are commonly employed in industries such as construction, machinery, and general engineering due to their favorable weldability, formability, and cost-efficiency. They are primarily designed for conveying fluids, gases, and solid materials.
DIN 1629 Grade St 37.0 tubes are available in diverse sizes and thicknesses, and they can be supplied in various lengths or custom cut-to-length based on specific requirements. Additional processing or treatments, such as normalization or heat treatment, may be applied to further enhance their properties.
DIN 1629 Grade St 37.0, when designated with "+N" (normalized or normalized formed), indicates that the steel tube has undergone a normalizing process during manufacturing. The normalization treatment involves heating the tube to a specific temperature and then allowing it to cool in still air.
Normalizing improves the mechanical properties of the steel, including its toughness, ductility, and impact strength. It also refines the grain structure, resulting in a more uniform and consistent material with reduced internal stresses.
The addition of "+N" to the grade designation signifies that the steel tube is supplied in the normalized condition. This means that the material has been subjected to the normalizing process to achieve the desired properties.
DIN 1629 Grade St 37.0 normalized or normalized formed (+N) refers to seamless circular tubes made from non-alloy steel with a specified minimum yield strength of 235 N/mm². These tubes are commonly used for general structural purposes, construction, and mechanical engineering applications.
Seamless tubes made from St 37.0 are used in the apparatus engineering, container and pipe construction as well as mechanical engineering.The steel is weldable.
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Property
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Temperature
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Value
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Density
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20.0 °C
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7.85 g/cm³
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Property
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Temperature
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Value
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Comment
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Elastic modulus
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-100.0 °C
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217 GPa
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20.0 °C
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212 GPa
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100.0 °C
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207 GPa
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200.0 °C
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199 GPa
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300.0 °C
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192 GPa
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400.0 °C
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184 GPa
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500.0 °C
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175 GPa
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600.0 °C
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164 GPa
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Elongation
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20.0 °C
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25 %
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Elongation, transverse
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20.0 °C
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23 %
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Poisson's ratio
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20.0 °C
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0.28 [-]
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Shear modulus
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23.0 °C
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82 GPa
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Typical for Low Carbon Steel
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Tensile strength
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20.0 °C
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350 - 480 MPa
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Tensile strength, transverse
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20.0 °C
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350 - 480 MPa
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Yield strength
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20.0 °C
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215 - 235 MPa
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Yield strength Rp0.2
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50.0 °C
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215 - 235 MPa
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200.0 °C
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170 - 185 MPa
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250.0 °C
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150 - 165 MPa
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300.0 °C
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130 - 140 MPa
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Yield strength, transverse
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20.0 °C
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215 - 235 MPa
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Property
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Temperature
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Value
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Comment
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Coefficient of thermal expansion
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-100.0 °C
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1.08E-5 1/K
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20.0 °C
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1.19E-5 1/K
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100.0 °C
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1.25E-5 1/K
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200.0 °C
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1.3E-5 1/K
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300.0 °C
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1.36E-5 1/K
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400.0 °C
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1.41E-5 1/K
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500.0 °C
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1.45E-5 1/K
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600.0 °C
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1.49E-5 1/K
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Max service temperature
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500 °C
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Typical for Carbon Steel
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Max service temperature, long
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0 - 300 °C
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Melting point
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1480 - 1526 °C
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Typical for Low Carbon Steel
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Specific heat capacity
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-100.0 °C
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423 J/(kg·K)
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20.0 °C
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461 J/(kg·K)
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100.0 °C
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479 J/(kg·K)
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200.0 °C
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499 J/(kg·K)
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300.0 °C
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517 J/(kg·K)
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400.0 °C
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536 J/(kg·K)
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500.0 °C
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558 J/(kg·K)
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600.0 °C
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587 J/(kg·K)
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Thermal conductivity
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20.0 °C
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56.9 W/(m·K)
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100.0 °C
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56.4 W/(m·K)
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200.0 °C
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53.5 W/(m·K)
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300.0 °C
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49.4 W/(m·K)
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400.0 °C
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45.2 W/(m·K)
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500.0 °C
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41.3 W/(m·K)
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600.0 °C
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37.6 W/(m·K)
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Thermal diffusivity
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20.0 °C
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15.7 mm²/s
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100.0 °C
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14.5 mm²/s
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200.0 °C
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12.9 mm²/s
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300.0 °C
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11.2 mm²/s
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400.0 °C
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9.6 mm²/s
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500.0 °C
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7.9 mm²/s
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600.0 °C
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6.3 mm²/s
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Property
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Temperature
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Value
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Electrical resistivity
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20.0 °C
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1.83E-7 Ω·m
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100.0 °C
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2.27E-7 Ω·m
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200.0 °C
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2.95E-7 Ω·m
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300.0 °C
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3.8E-7 Ω·m
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400.0 °C
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4.81E-7 Ω·m
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500.0 °C
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5.99E-7 Ω·m
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600.0 °C
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7.38E-7 Ω·m
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Property
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Value
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Comment
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Curie temperature
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770 °C
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Typical for Low Carbon Steel
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Property
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Value
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Carbon
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0.17 %
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Nitrogen
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9E-3 %
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Phosphorus
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0.04 %
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Sulfur
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0.04 %
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