51 seamless steel pipe network to provide: knowledge of seamless pipe for petroleum cracking

Standard: GB9948 - China National Standard

Uses: Used in petroleum, refinery furnace tubes, heat exchanger tubes and piping seamless steel tubes.

Major production steel grades: 10, 20, 15CrMo, 1Cr2Mo, 1Cr5Mo, etc.

Size tolerance:

Steel pipe type

Outer diameter (D)

Steel pipe wall thickness (S)

Cold-drawn tube

Steel tube outside diameter (mm)

Allowable deviation (mm)

Steel pipe wall thickness (mm)

Allowable deviation (mm)

>30～50

±0.3

≤30

±10%

>50～219

±0.8%

Hot rolled tube

>219

±1.0%

>20

±10%

Mechanical properties:

standard

Grade

Tensile strength (MPa)

Yield strength (MPa)

Elongation(%)

Impact work (J)

Brinell Hardness (HB)

delivery status

GB9948

10

330-490

≥205

≥24

/

/

Normal fire

20

410 to 550

≥245

≥21

≥39

/

Normal fire

15CrMo

440~640

≥235

≥21

≥47

≤170

Normalizing and tempering

1Cr2Mo

≥390

≥175

≥22

≥92

≤179

Normalizing and tempering

1Cr5Mo

≥390

≥195

≥22

≥92

≤187

annealing

chemical composition:

standard

Grade

chemical composition(%)

C

Si

Mn

P

S

Cr

Mo

Ni

GB9948

10

0.07 to 0.14

0.17 to 0.37

0.35 to 0.65

≤0.035

≤0.035

≤0.15

/

≤0.25

20

0.17 to 0.24

0.17 to 0.37

0.35 to 0.65

≤0.035

≤0.035

≤0.25

/

≤0.25

15CrMo

0.12 to 0.18

0.17 to 0.37

0.40 to 0.70

≤0.035

≤0.035

0.80 to 1.10

0.40 to 0.55

≤0.30

1Cr2Mo

≤0.15

0.50 to 1.00

0.30 to 0.60

≤0.035

≤0.030

2.15 to 2.85

0.45 to 0.65

/

1Cr5Mo

≤0.15

≤ 0.50

≤0.60

≤0.035

≤0.030

4.00 to 6.00

0.45 to 0.60

≤0.60

Cloth Tape Measure

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