China's most trusted manufacturers of Stainless Steel Pipes & Tubes.

Stainless Steel Seamless Pipes / Tubes

Short Description:

Tube Range: 1/2″ OD – 24″ OD
Schedules: 5, 10S, 10, 30, 40S, 40, 80, 80S, XS, 160, XXH
Length: Custom Cut Lengths
Material Grade:
304/304L/316/316L/321/321H/310/310s/317L/310H//904L
Standards:  AISI ASTM JIS SUS and GB
Surface: BA, 2B, NO.1, NO.4, 4K, HL, 8K
Types: Round, Square, Rectangle, Coil, “U” Shape, Hydraulic & Honed Tubes


Product Description

Specification

Manufacturing Technique

Product Display & Application

Product Tags

Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.

The high precision seamless tubes manufactured at Hunan Great Steel Pipe begin their journey as seamless tube extrusions, in a range of different sizes. This material is reduced in size a number of times until it gradually reaches the exact specifications our customers require. Each time we perform a reduction process, the tube needs to be cut, cleaned and heat treated before the next one can commence.


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  • Product Name

    Executive Standard

    Dimension

    Steel Code / Steel Grade

    Seamless Austenitic Stainless Steel Pipes

    ASTM A312/A312M, ASME SA312/SA312M

    OD: 1/4″~20″
    WT: SCH5S~SCH80S

    TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H

    Seamless Austenitic Stainless Steel Tubing for General Service

    ASTM A269, ASME SA269

    OD: 6.0~50.8mm
    WT: 0.8~10.0mm

    TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H

    Seamless Austenitic Alloy-Steel Boiler, Super Heater and Heat-Exchanger Tubes

    ASTM A213/A213M, ASME SA213/SA213M

    OD: 6.0~50.8mm
    WT: 0.8~10.0mm

    TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H

    Seamless Duplex Stainless Steel Tubing for General Service

    ASTM A789 / A789M

    OD: 19.0~60.5mm
    WT: 1.2~5.0mm

    S31803, S32205, S32750

    Seamless Duplex Stainless Steel Pipes

    ASTM A790 / A790M

    OD: 3/4″~10″
    WT: SCH5S~SCH80S

    S31803, S32205, S32750

    Seamless Stainless Steel Mechanical Tubing

    ASTM A511

    OD: 6.0~50.8mm
    WT: 1.8~10.0mm

    MT304, MT304L, MT304H, MT310, MT310S, MT316, MT316L, MT317, MT317L, MT321, MT321H, MT347

    Seamless Stainless Steel Tubes for Pressure Purposes

    EN 10216, DIN 17456, 17458

    OD: 6.0~530.0mm
    WT: 0.8~34.0mm

    1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4878, 1.4432, 1.4462

    Dimension Tolerances & Chemical Components of Seamless Steel Pipe

    Pipe types

    Pipe Szie(mm)

    Tolerances

    Hot rolled

    OD

    <50

    ±0.50mm

    ≥50

    ±1%

    WT

    <4

    ±12.5%

    ≥4~20

    +15%, -12.5%

    >20

    ±12.5%

    Cold drawn

    OD

    6~10

    ±0.20mm

    10~30

    ±0.40mm

    30~50

    ±0.45

    >50

    ±1%

    WT

    <1

    ±0.15mm

    >1~3

    + 15%, – 10%

    >3

    + 12.5%, – 10%

     

    Standard

    Grade

    Chemical Components (%)

    Mechanical Properties

    c

    Si

    Mn

    P

    S

    Mo

    Cr

    V

    Tensile STrength(Mpa)

    Yield STrength(Mpa)

    Elongation

    (%)

    ASTM A53

    A

    ≤0.25

    /

    ≤0.95

    ≤0.05

    ≤0.06

    ≤0.15

    ≤0.40

    ≤0.08

    ≥330

    ≥205

    ≥29.5

    B

    ≤0.30

    /

    ≤1.2

    ≤0.05

    ≤0.06

    ≤0.15

    ≤0.40

    ≤0.08

    ≥415

    ≥240

    ≥29.5

     

    Standard

    Grade

    Chemical Components(%)

    Mechanical Properties

    c

    Si

    Mn

    P

    S

    Mo

    Cr

    V

    Tensile STrength

    (Mpa)

    Yield STrength

    (Mpa)

     Elongation(%)

    ASTM A106

    A

    ≤0.30

    ≥0.10

    0.29-1.06

    ≤0.035

    ≤0.035

    ≤0.15

    ≤0.40

    ≤0.08

    ≥415

    ≥240

    ≥30

    B

    ≤0.35

    ≥0.10

    0.29-1.06

    ≤0.035

    ≤0.035

    ≤0.15

    ≤0.40

    ≤0.08

    ≥485

    ≥275

    ≥30

     

    Standard

    Grade

    Chemical Components(%)

    Mechanical Properties

    c

    Si

    Mn

    P

    S

    Tensile STrength(Mpa)

    Yield STrength(Mpa)

    Elongation(%)

    ASTM A179

    A179

    0.06-0.18

    /

    0.27-0.63

    ≤0.035

    ≤0.035

    ≥325

    ≥180

    ≥35

     

    Standard

    Grade

    Chemical Components(%)

    Mechanical Properties

    c

    Si

    Mn

    P

    S

    Tensile STrength(Mpa)

    Yield STrength(Mpa)

    Elongation(%)

    ASTM A192

    A192

    0.06-0.18

    ≤0.25

    0.27-0.63

    ≤0.035

    ≤0.035

    ≥325

    ≥180

    ≥35

     

    Standard

    Grade

    Chemical Components

    Tensile STrength(min)

    Yield Strength(min)

    C

    Mn

    P

    S

    Mpa

    Mpa

    API 5L PSL1

    A

    0.22

    0.90

    0.030

    0.030

    331

    207

    B

    0.28

    1.20

    0.030

    0.030

    414

    241

    X42

    0.28

    1.30

    0.030

    0.030

    414

    290

    X46

    0.28

    1.40

    0.030

    0.030

    434

    317

    X52

    0.28

    1.40

    0.030

    0.030

    455

    359

    X56

    0.28

    1.40

    0.030

    0.030

    490

    386

    X60

    0.28

    1.40

    0.030

    0.030

    517

    414

    X65

    0.28

    1.40

    0.030

    0.030

    531

    448

    X70

    0.28

    1.40

    0.030

    0.030

    565

    483

     

    Standard

    Grade

    Chemical Components

    Tensile STrength(min)

    Yield Strength(min)

    C

    Mn

    P

    S

    Mpa

    Mpa

    API 5L PSL2

    B

    0.24

    1.20

    0.025

    0.015

    414

    241

    X42

    0.24

    1.30

    0.025

    0.015

    414

    290

    X46

    0.24

    1.40

    0.025

    0.015

    434

    317

    X52

    0.24

    1.40

    0.025

    0.015

    455

    359

    X56

    0.24

    1.40

    0.025

    0.015

    490

    386

    X60

    0.24

    1.40

    0.025

    0.015

    517

    414

    X65

    0.24

    1.40

    0.025

    0.015

    531

    448

    X70

    0.24

    1.40

    0.025

    0.015

    565

    483

    X80

    0.24

    1.40

    0.025

    0.015

    621

    552

    Seamless Pipe (and tubing) is made by extruding a steel block or by drilling a solid steel bar. Next, the extrusion or the drilled steel bar is cold drawn through a dye to achieve the diameter and thickness needed. Because this process can cause mechanical hardening, sometimes the material is annealed and straightened as a final process. Seamless Pipe & Tubing is subdivided as:

    Cold Drawn Seamless, or CDS, exhibits precise tolerances and a good surface finish.

    Hot Finished Seamless, or HFS, has less critical tolerances and somewhat scaly finish and is not as strong as CDS.

    For Drawn over Mandrel, or DOM tubing, the first stages of manufacturing are identical to ones used to make electric resistance welded tubing, but in the finishing stages the entire flash weld is taken out and the tube is cold drawn over a mandrel. A mandrel is a round object against which material can be forged or shaped. The cold drawn process provides the tube with better dimensional tolerances, improved surface finish and the strongest weld strength achievable.

    Hot Rolled Process for Seamless Steel Pipe

    photo21

     

    Cold Drawn Process for Seamless Steel Pipe

    photo22

     

    The main processes we use when manufacturing seamless tubes are tube reduction (or pilgering) and cold drawing.

    Other important processes in between or after the drawing process are:
    ● Degreasing / cleaning
    ● Straightening
    ● NDT testing
    ● Packaging
    ● Annealing
    ● Cutting to length / deburring
    ● Printing
    ● Shipment

    Optional processes include:
    ● Polishing
    ● Electropolishing
    All stainless steel seamless pipes can be cut to your exact requirements. Some made to order items can be produced in 2-3 weeks.

    Stainless-Steel-Seamless-pipe-supplies

    Stainless steel seamless pipe can resist high temperatures for cleanliness and maintain the purity of materials which contact stainless steel directly. Stainless steel pipe and tubing are used in chemical plants, aviation fields, marine equipment, cryogenic transportation, medical and architectural industries.

    ● Chemical plants
    ● Aviation fields
    ● Marine equipment
    ● Cryogenic transportation
    ● Medical & architectural industries

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