Large Diameter Seamless Steel Pipe

at present, China's large-diameter seamless steel tubes, the main production process for hot-rolled large-diameter seamless steel tubes and hot expanded seamless steel tubes, hot-rolled seamless steel tubes can produce non-GB size, thermal expansion seamless tube is what we often say hot Expanded pipe,

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Large diameter seamless steel pipe

At present, China's large-diameter seamless steel tubes, the main production process for hot-rolled large-diameter seamless steel tubes and hot expanded seamless steel tubes, hot-rolled seamless steel tubes can produce non-GB size, thermal expansion seamless tube is what we often say hot Expanded pipe, a relatively low density but strong contraction of the pipe using the oblique rolling method or drawing method to expand the pipe diameter of a barn finish rolling process. The thickening of steel pipes in a short period of time can produce non-standard and special models of seamless pipes with low cost and high production efficiency. It is the current trend in the field of international pipe rolling.
Large diameter seamless steel pipe

Large diameter seamless steel pipe.jpg

For GB5310 steel pipe with outer diameter greater than or equal to 76 and wall thickness ≥ 14mm, Charpy V-type longitudinal impact test shall be carried out at 20°C; the average value of impact energy of the three samples shall not be lower than 40J, allowing one sample The impact energy is lower than the average but not lower than 70% of the average. Outer diameter> 219.1mm, and wall thickness ≥ 25mm steel tube can be used instead of the longitudinal mechanical properties test. The Charpy V-type transverse impact test was performed at 20°C, and the large-diameter tube was more convenient for the transverse mechanical test.
Application
The scope of use includes general structural and mechanical structures, and a large number of structural tubes used in construction, machinery, transportation, aviation, oil extraction and other industries
Dimensional tolerance

standard

Outer diameter tolerance

Thickness tolerance

GB/T 8162

D<50

±0.50mm

S<4mm

±12.5%

D≥50

±1%

4-20mm

+15/-12.5%

S≥20mm

±12.5%

DIN1629

D50

±0.50mm

S2Sn

+15/-10%

D48.3D48.3

±1%

2SnS4Sn

+12.5/-10%

S4Sn

±9%

ASTM A53

D<48.3

±0.4/-0.79mm

±12.5%

D≥48.3

±1%

ASTM A106

D<48.3

±0.4/-0.79mm

±12.5%

D48.3-114.3

±0.79mm

D≥114.3

±1.59/-0.79mm

Mechanical properties:

standard

Steel grade

tensile strength(MPa)

Yield Strength(MPa)

Elongation rate

<16mm

16-30mm

GB/T 8162

10

335

205

195

24

20

390

245

235

20

35

510

305

295

17

45

590

335

325

14

16Mn

490

325

315

21

DIN 1629


<16mm

>16mm


ST35

345-460

235

225

25

ST45

440-550

255

245

21

ST55

540-645

295

285

17

ST52

490-630

355

345

22

ST45

590-730

335

325

14

ASTM A53

A

330

205


B

415

240

ASTM A106

A

330

205


B

415

240

C

485

275


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