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1. Sizes

For Seamless Mechanical Steel Tubes:
Outer Diameter: 1/8''(10.3mm) –48''(1219.2mm)
Wall Thickness: < 5.91''(150mm)

2. Specifications

Mechanical Steel Tubes
ST37/ST44/ST52---DIN2391/DIN1629;Q235,Q345B/C/D/E---GB/T8162;
E235,E355, E355K2---EN10297-1; S235,S275,S355J0H/ J2H/K2H---EN10210-1

3.Chemical Composition

Steel Grade

Chemical Composition (%)

Symbol

Material Numer

max.

Si max.

Mn

max.

max.

St 37

1.0305

0.17

0.35

³0.40

0.025

0.025

St 45

1.0408

0.21

0.35

³0.40

0.025

0.025

St 52

1.0580

0.22

0.55

£1.60

0.025

0.025

Nb£0.03%Ti£0.03%V£0.05%Nb+Ti+V£0.05%



4.Mechanical Properties

Steel Grade

Upper Yield Stress ReH for wall thickness,in mm

Tensile strength Rm  N/mm2

Elongation (%) A5

Symbol

Material Number

Up to 16

Over 16 up to 40

Over 40

Longitudinal

Transverse

St 37

1.0305

235

225

216

350 to 480

25

23

St 45

1.0408

275

265

255

420 to 550

21

19

St 52

1.0580

355

345

335

490 to 630

21

19



      

      

      

      

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