API 5L 80N Bezszwowa stalowa rura do oleju

Sort Code

Manufacuring Method

Nominal Size

Tolerances

Common Level

High Level

W-H

Hot Rolling (Extrusion)

Outer Diameter     D

≤54

±0.50

±0.30

>54~325

±1%D

±0.75%D

>325

±1%D

-

Wall Thicknass     S

≤20

+15%S

-10%S

±10%S

>20

+12.5%S

-10%S

±10%S

Hot Expand

Outer Diameter     D

All

±1%D

Wall Thicknass     S

All

±15%S

W-C

Cold Drawn(Rolling)

Outer Diameter     D

≤25.4

±0.15

>25.4~40

±0.20

>40~50

±0.25

>50~60

±0.30

>60

±0.75%D

±0.5%D

Wall Thicknass     S

≤3.0

±0.3

±0.2

>3.0

±10%S

±7.5%S

Number

Testing items

Sampling quantity

1

Chemical composition

1 sample from each furnace

2

Tensile test

1 sample from each of two steel tubes on each batch

3

Hardness test

3 samples taken on 2 steel tubes on each batch

4

Impact test

All

5

Hydraulic test

1 sample from each of two steel tubes on each batch

6

Flattening test

2 samples taken on 2 steel tubes on each batch

7

Bending test

1 sample taken on 2 steel tubes on each furnace

8

Flaring test

2 samples taken on 2 steel tubes on each batch

9

Macroscopic examination

1 sample taken on 2 steel tubes on each furnace

10

Non-metallic inclusions

1 sample taken on 2 steel tubes on each furnace

11

Eddy current testing

All

12

Magnetic flux leakage detection 

All

13

Ultrasonic testing

All

14

Intergranular corrosion test

1 sample from each of two steel tubes on each batch