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        • Name: Welded Steel Pipe
        • Number: 005.01.01
        • Views : 203

        Definition: welded steel pipe is also called welded pipe which is steel pipe formed by welding the curled steel plates or strip steel, with general fixed length of 6m.

        Production process: raw material uncoiling – flattening – end cutting and welding – looping – molding – welding – internal/external removal of welding beads – precorrection – inductive heat treatment – sizing and straightening – eddy current testing – cutting – water pressure inspection – acid pickling – final inspection (strict control) – packing – delivery

        Category:

        Production methods:
        a. Process – electric arc-welded pipes, resistance welded pipe (high frequency, low frequency), gas-welded pipes, furnace butt-welded pipes
        b. Welding seam – straight welded pipes, spiral welded pipes

        Wall Thickness
        Thin-wall steel pipes, thick-wall steel pipes

        End Shape
        Circular welded pipes and specially-shaped (square, flat, etc.) welded pipes

        Length: 6m (capable of being customized and processed according to customer requirements)

        Packing: bundling, nude packing, or packing according to customer requirements

        Carbon Steel Straight Welded Pipes
        Weight (kg) per meter
        Note: d (outer diameter); t (wall thickness)

        Features:
        Straight welded pipes feature simple production process, high production efficiency, low cost and high development speed.
        The intensity of spiral welded pipes is generally higher than that of straight welded pipes; welded pipes with larger pipe diameters can be produced by relatively narrow blanks; welded pipes with different pipe diameters can be produced blanks with the same width. However, spiral welded pipes have the length increase of 30~100%, as well as lower production speed compared with straight welded pipes with the same length.

        Nominal size GB thickness mm

        Size

        OD

        National
        thickness

        Welded pipe theory
        weight gauge

        4inch

        15

        1/2inch

        21.25

        2.75

        1.26

        6inch

        20

        3/4inch

        26.75

        2.75

        1.63

        1inch

        25

        1inch

        33.3

        3.25

        2.42

        1.2inch

        32

        11/4inch

        42.25

        3.25

        3.13

        1.5inch

        40

        11/2inch

        48

        3.5

        3.84

        2inch

        50

        2inch

        60

        3.5

        4.88

        2.5inch

        70

        21/2inch

        75.5

        3.75

        6.64

        3inch

        80

        3inch

        88.5

        4.0

        8.34

        4inch

        100

        4inch

        114

        4.0

        10.85

        5inch

        125

        5inch

        140

        4.5

        15.04

        6inch

        150

        6inch

        165

        4.5

        17.81

        8inch

        200

        8inch

        219

        6

        31.52

         

        Spiral welded pipe gauge

        Specification

        Thickness

        Kg/m

        GB
        pressure value

        Department of
        hydraulic pressure

        Specification

        Thickness

        Kg/m

        GB
        pressure value
        Department of
        hydraulic pressure

        219

        6

        32.02

        9.7

        7.7

        720

        6

        106.15

        3

        2.3

         

        7

        37.1

        11.3

        9

         

        7

        123.59

        3.5

        2.7

         

        8

        42.13

        12.9

        10.3

         

        8

        140.97

        4

        3.1

        273

        6

        40.01

        7.7

        6.2

         

        9

        158.31

        4.5

        3.5

         

        7

        46.42

        9

        7.2

         

        10

        175.6

        5

        3.9

         

        8

        52.78

        10.3

        8.3

         

        12

        210.02

        6

        4.7

        325

        6

        47.7

        6.5

        5.2

        820

        7

        140.85

        3.1

        2.4

         

        7

        55.4

        7.6

        6.1

         

        8

        160.7

        3.5

        2.7

         

        8

        63.04

        8.7

        6.9

         

        9

        180.5

        4

        3.1

        377

        6

        55.4

        5.7

        4.5

         

        10

        200.26

        4.4

        3.4

         

        7

        64.37

        6.7

        5.2

         

        11

        219.96

        4.8

        3.8

         

        8

        73.3

        7.6

        6

         

        12

        239.62

        5.3

        4.1

         

        9

        82.18

        8.6

        6.8

        920

        8

        180.43

        3.1

        2.5

         

        10

        91.01

        -

        7.5

         

        9

        202.7

        3.5

        2.8

        426

        6

        62.25

        5.1

        4

         

        10

        224.92

        3.9

        3.1

         

        7

        72.83

        5.9

        4.6

         

        11

        247.22

        4.3

        3.4

         

        8

        82.97

        6.8

        5.3

         

        12

        269.21

        4.7

        3.7

         

        9

        93.05

        7.6

        6

        1020

        8

        200.16

        2.8

        2.2

         

        10

        103.09

        8.5

        6.7

         

        9

        224.89

        3.2

        2.5

        478

        6

        70.34

        4.5

        3.5

         

        10

        249.58

        3.5

        2.8

         

        7

        81.81

        5.3

        4.1

         

        11

        274.22

        3.9

        3

         

        8

        93.23

        6

        4.7

         

        12

        298.81

        4.2

        3.3

         

        9

        104.6

        6.8

        5.3

        1220

        8

        239.62

        -

        1.8

         

        10

        115.92

        7.5

        5.9

         

        10

        298.9

        3

        2.3

        529

        6

        77.89

        4.1

        3.2

         

        11

        328.47

        3.2

        2.5

         

        7

        90.61

        4.8

        3.7

         

        12

        357.99

        3.5

        2.8

         

        8

        103.29

        5.4

        4.3

         

        13

        387.46

        3.8

        3

         

        9

        115.92

        6.1

        4.8

        1420

        10

        348.23

        2.8

        2

         

        10

        128.49

        6.8

        5.3

         

        14

        417.18

        3.2

        2.4

        630

        6

        92.83

        3.4

        2.6

        1620

        12

        476.37

        2.9

        2.1

         

        7

        108.05

        4

        3.1

         

        14

        554.99

        3.2

        2.4

         

        8

        123.22

        4.6

        3.6

        1820

        14

        627.04

        3.3

        2.2

         

        9

        138.33

        5.1

        4

        2020

        14

        693.09

        -

        2

         

        10

        153.4

        5.7

        4.5

        2220

        14

        762.15

        -

        1.8

        Applications: the product is widely applied to water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, and is used for liquid conveying (water supply, water drainage), gas conveying (gas, steam, liquefied petroleum gas), structural use (piling pipes, bridges), pipes for wharfs, roads and architectural structures, etc.

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