steel&steel pipe&High-pressure chemical fertilizer pipe

Item

Size mm

Tolerances

General

High grade

Hot-rolled pipe

 Diameter

all

± 1%( minimum± 0.50mm )

thickness

all

+15%

-12.5%( minimum +0.45/ -0.40 mm )

cold drawing pipe

 Diameter

6 ~ 10

± 0.20 mm

± 0.15 mm

10 ~ 30

± 0.40 mm

± 0.20 mm

30 ~ 50

± 0.45 mm

± 0.30 mm

50

± 1%

± 0.8%

 thickness

≤ 1

± 0.15 mm

± 0.12 mm

1 ~ 3

+15%

-10%

+12.5%

-10%

3

+12.5%

-10%

± 10%