DIN 2391-2 Grade St 35 soft annealed (+A)

DIN 2391-2 Grade St 35 soft annealed (+A) introduction

Seamless precision steel tube made from St 35 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.

Equivalent material: AFNOR TU37-b, BS CFS3, GOST 10, UNI Fe35-1, SS 1233, ASTM 1010, DIN E235, DIN 1.0308, JIS STB340, JIS STAM340G, JIS 12A, EN E235, EN 1.0308

DIN 2391-2 Grade St 35 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 35 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
Max service temperature, long - Max service temperature, long of 0 - 120 °C -
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 35 soft annealed (+A) chemical

Property Value
Carbon Carbon of 0.17 %
Manganese Manganese of 0.4 %
Phosphorus Phosphorus of 0.03 %
Silicon Silicon of 0.35 %
Sulfur Sulfur of 0.025 %

DIN 2391-2 Grade St 35 soft annealed (+A) magnetic

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

DIN 2391-2 Grade St 35 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 35 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 25 % -
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 315 MPa -

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