DIN 2391-2 Grade St 30 Si soft annealed (+A)
DIN 2391-2 Grade St 30 Si soft annealed (+A) introduction
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.
Equivalent material: ASTM 1008, DIN 1.0211, DIN S215GSiT, BS HFW 2, AISI 1008, SAE 1008, JIS STAM290GA, JIS STAM290GB, EN 1.0211
DIN 2391-2 Grade St 30 Si soft annealed (+A) general
| Property |
Temperature |
Value |
Comment |
| Density |
23.0 °C |
Density of 7.8 - 7.9 g/cm³ |
Typical for Low Carbon Steel |
DIN 2391-2 Grade St 30 Si soft annealed (+A) thermal
| Property |
Temperature |
Value |
Comment |
| Coefficient of thermal expansion |
23.0 °C |
Coefficient of thermal expansion of 1.32E-5 - 1.38E-5 1/K |
Typical for Low Carbon Steel |
| 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 |
23.0 °C |
Specific heat capacity of 465 J/(kg·K) |
Typical for Low Carbon Steel |
| Thermal conductivity |
23.0 °C |
Thermal conductivity of 25 - 93 W/(m·K) |
Typical for Low Carbon Steel |
DIN 2391-2 Grade St 30 Si soft annealed (+A) chemical
| Property |
Value |
| Carbon |
Carbon of 0.1 % |
| Manganese |
Manganese of 0.55 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.3 % |
| Sulfur |
Sulfur of 0.025 % |
DIN 2391-2 Grade St 30 Si soft annealed (+A) magnetic
| Property |
Value |
Comment |
| Curie temperature |
Curie temperature of 770 °C |
Typical for Low Carbon Steel |
DIN 2391-2 Grade St 30 Si soft annealed (+A) electrical
| Property |
Temperature |
Value |
Comment |
| Electrical resistivity |
23.0 °C |
Electrical resistivity of 1.43E-7 - 1.74E-7 Ω·m |
Typical for Carbon Steel |
DIN 2391-2 Grade St 30 Si soft annealed (+A) mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
23.0 °C |
Elastic modulus of 200 - 215 GPa |
Typical for Low Carbon Steel |
| Elongation |
20.0 °C |
Elongation of 30 % |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.29 [-] |
Typical for Low Carbon Steel |
| Shear modulus |
23.0 °C |
Shear modulus of 82 GPa |
Typical for Low Carbon Steel |
| Tensile strength |
20.0 °C |
Tensile strength of 280 MPa |
- |
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