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the requirement for the mechanical property of casing, tubing and coupling stock

grade

type

yield strength

tensile strength

V-notch impact test

min

 max

  min

 the average value of th three specimens

 transversal≥

 longitudinal≥

 J55

  pipe body and coupling stock

 379

552

 517

 20 

 27

 N80

 Pipe body

552

 758 

 689 

 14

 27

 Coupling stock

20 

  41


normal temperature mechanical property of carbon and carbon-manganese steel seamless steel tubes and pipes for ship

grade

tensile strength

yield point

eiongation

不小于≥

320

320-440

195

25

360

360-480

215

24

410

410-530

235

22

460

460-580

265

21

490

490-610

285

21


the mechanical propery of hot-rolled seamless steel pipe used in hydraulic propping supporting

trademark

Specimen heat treatment system

tensile strength

yield strength

elongation

sectional shrinkage ratio

absorbed energy

status of steel pipe annealing supply Brinell hardness HB is no more than

不小于≥

20
35
45

400
510
590

245
305
335

20
17
14

27SiMn

water-quenching temper cooling agent oil or water

980

 835 

12 

40 

39

 217

30MnNbRe

water-quenching temper cooling agent air cooling

850

720

13

45

 48


the mechanical property of the high-pressure boiler used in hydraulic propping

number

type of steel

trademark

tensile strength

Longitudinal mechanical property

Transverse mechanical property

 yield point

elongation

absorbed energy

tensile strength

yield point

elongation

absorbed energy

不小于≥

不小于≥

1

quality carbon structural steels

20G

410-550

245

24

35

400

215

22

27

2

20MnG

≥415

240

22

35

27

3

25MnG

≥485

275

20

35

27

4

alloy structure steels

15 MoG

450-600

270

22

35

20

27

5

20 MoG

≥415

220

22

35

27

6

12CrMoG

410-560

205

21

35

 —

27

7

15 CrMoG

440-640

235

21

35

440

225

20

27

8

12CrMoVG

470-640

255

21

35

440

255

19

27



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