DIN 2391‑2 Grade St 30 Si – Normalized or Normalized Formed (N) Steel Tubes for Precision Applications
Seamless precision steel tube made from St 30 Si is mainly used as construction element with special requirements in dimension accuracy, small wall thicknesses and good surface condition. The tubes are made in different grades (A and C). Grade C is valid for conduits. Grade A: for mechanical load without special grade requirement, without inspection certificate Grade C: for special requirements (testing after arrangement, e.g. bending, flanging, bulging a.o.) The weldability is given. Application (acc. VdTÜV-Wbl 445 : 2001-09): pressure vessels acc. TRB 100 and AD-Merkblatt W 4 from -10 to 300 degrees C, for steam boilers acc. TRD 702, for tube parts acc. TRbF 131 and 212 analogical St 37.0 in DIN 1629 as well as in the nuclear engineering.
Properties
General
| Property | Temperature | Value | Comment |
|---|---|---|---|
Density | 23.0 °C | 7.8 - 7.9 g/cm³ | Typical for Low Carbon Steel |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 23.0 °C | 200 - 215 GPa | Typical for Low Carbon Steel |
Elongation | 20.0 °C | 30 % | |
Poisson's ratio | 23.0 °C | 0.29 [-] | Typical for Low Carbon Steel |
Shear modulus | 23.0 °C | 82 GPa | Typical for Low Carbon Steel |
Tensile strength | 20.0 °C | 290 - 420 MPa | |
Yield strength | 20.0 °C | 215 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.32E-5 - 1.38E-5 1/K | Typical for Low Carbon Steel |
Max service temperature | 500 °C | Typical for Carbon Steel | |
Melting point | 1480 - 1526 °C | Typical for Low Carbon Steel | |
Specific heat capacity | 23.0 °C | 465 J/(kg·K) | Typical for Low Carbon Steel |
Thermal conductivity | 23.0 °C | 25 - 93 W/(m·K) | Typical for Low Carbon Steel |
Electrical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Electrical resistivity | 23.0 °C | 1.43E-7 - 1.74E-7 Ω·m | Typical for Carbon Steel |
Magnetic
| Property | Value | Comment |
|---|---|---|
Curie temperature | 770 °C | Typical for Low Carbon Steel |
Chemical properties
| Property | Value |
|---|---|
Carbon | 0.1 % |
Manganese | 0.55 % |
Phosphorus | 0.03 % |
Silicon | 0.3 % |
Sulfur | 0.025 % |
Metal
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- DIN 1629 St 37.0 Grade Steel: Normalized or Normalized Formed (+N) – Key Properties & Applications