TAGS: DIN 1629 | steel grade | St 44.0 | Seamless steel pipe | steel pipe |
DIN 1629 Grade St 44.0 - Seamless Carbon Steel Tubes Introduction
DIN 1629 Grade St 44.0 is a standard specification for seamless carbon steel tubes used in various structural and mechanical applications. This grade is part of the DIN 1629 series, which covers different grades of non-alloy steel tubes.
The designation "St 44.0" indicates a structural carbon steel composition with a minimum yield strength of 275 megapascals (MPa). These seamless tubes are commonly employed in industries such as construction, machinery, and general engineering due to their favorable weldability, formability, and durability. They are primarily designed for conveying fluids, gases, and solid materials.Seamless tubes made from St 44.0 are used in the apparatus engineering, container and pipe construction as well as mechanical engineering.The steel is weldable.
DIN 1629 Grade St 44.0 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 44.0, when designated with "+N" (normalized or normalized formed), indicates that the steel tubes have undergone a normalizing process during manufacturing. The normalization treatment involves heating the tubes to a specific temperature and then allowing them 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 tubes are 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 44.0 normalized or normalized formed (+N) refers to seamless carbon steel tubes that meet the requirements specified in DIN 1629. These tubes are commonly used in structural and mechanical applications where enhanced mechanical properties and dimensional accuracy are required.
By undergoing the normalization process, the tubes exhibit improved uniformity and reliability, making them suitable for various industries such as construction, machinery, and general engineering.
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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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21 %
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Elongation, transverse
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20.0 °C
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19 %
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Poisson's ratio
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23.0 °C
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0.29 [-]
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Typical for Low Carbon Steel
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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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420 - 550 MPa
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Tensile strength, transverse
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20.0 °C
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420 - 550 MPa
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Yield strength
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20.0 °C
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255 - 275 MPa
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Yield strength Rp0.2
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50.0 °C
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255 - 275 MPa
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200.0 °C
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200 - 215 MPa
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250.0 °C
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180 - 195 MPa
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300.0 °C
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155 - 165 MPa
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Yield strength, transverse
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20.0 °C
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255 - 275 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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53.4 W/(m·K)
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100.0 °C
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52.9 W/(m·K)
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200.0 °C
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50.3 W/(m·K)
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300.0 °C
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46.7 W/(m·K)
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400.0 °C
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43.3 W/(m·K)
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500.0 °C
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39.8 W/(m·K)
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600.0 °C
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36.7 W/(m·K)
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Thermal diffusivity
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20.0 °C
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14.8 mm²/s
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100.0 °C
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13.6 mm²/s
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200.0 °C
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12.1 mm²/s
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300.0 °C
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10.6 mm²/s
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400.0 °C
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9.2 mm²/s
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500.0 °C
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7.7 mm²/s
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600.0 °C
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6.2 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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1.95E-7 Ω·m
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100.0 °C
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2.42E-7 Ω·m
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200.0 °C
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3.14E-7 Ω·m
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300.0 °C
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4.02E-7 Ω·m
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400.0 °C
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5.02E-7 Ω·m
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500.0 °C
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6.21E-7 Ω·m
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600.0 °C
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7.55E-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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0.21 %
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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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