Steel Structural Pipe

Tolerance of Outer Diameter Tolerance of Wall Thickness Unit:mm Production Process

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Product Details

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Tolerance of Outer Diameter

Outer Diameter(D)

General Precesion(PD.A)a

Higher Precision(PD.B)

High Precision(PD.C)

5-20

±0.30

±0.15

±0.05

20-35

±0.40

±0.20

±0.10

35-50

±0.50

±0.25

±0.15

50-80

±1%D

±0.35

±0.25

80-114.3

±0.60

±0.40

114.3-168.3

±0.70

±0.50

168.3-219.1

±0.80

±0.60

219.1-711

±0.75%D

±0.5%D

a Not apply for steel pipe for roller of belt conveyor

Tolerance of Wall Thickness     Unit:mm

Wall Thickness(t)

General Precesion(PD.A)a

Higher Precision(PD.B)

High Precision(PD.C)

Non-uniform Wall Thicknessb

0.50-0.70

±0.10

±0.04

±0.03

≤7.5%t

0.70-1.0

±0.05

±0.04

1.0-1.5

±0.06

±0.05

1.5-2.5

±10%t

±0.12

±0.06

2.5-3.5

±0.16

±0.10

3.5-4.5

±0.22

±0.18

4.5-5.5

±0.26

±0.21

5.5

±7.5%t

±5.0%t

a Not apply for steel pipe for roller of belt conveyor b Not apply for General Precesion steel tube. Non-uniform Wall Thickness means the difference between maximum and minimum values of measured wall thickness on the same cross section.

Production Process

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