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Straight Seam Pipe

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  • 1. Welding type of welded pipe: ERW, SAWL, EFW, HFW.


    2. Materials: Q235, Q355, S195T, GR.B, X42, X52, X60, CC60, CC70,ST35, ST52, S235JR, S355JR, SGP, STP G370,

    STP G410, GR12, GR2 etc. 


    3. Standard: GB 3091, API 5L,ASTM A53, A515, A672, A500,A252,,BS1387, EN10255, EN10217,JIS G3454 etc.


    4. Specification:

    Outer diameter: 1/4”-48” (13.7mm-1219.2mm).

    Wall thickness: 1.2mm-60mm.

    Length: 2m-14m.


    5. End: plain end, beveled end, thread, coupling, plastic cap in the both end, pipe clamp.


    6. Surface: oiled, black painted or varnish, galvanized, 3PE, FBE, or other epoxy coating.


    7. Inspection: hydrostatic testing, ultrasonic testing, eddy current testing, magnetic particle testing, impact testing, hardness

    testing, etc.


    8. Application: petroleum, chemical, electric power, water, construction, pipelines, etc.

  • 1. Straight seam steel pipe specification




    2. Pipe geometric tolerance


    Standard code content itemsSY/T5037 -2000T9711 -1997 (A class pipe)API 5L(43 version)
    ApplicationsGas, water, kerosene, air, heating, steam and other general fluid pipes with steel pipesOil and gas industry transmission pipeOil and gas industry transmission pipe
    SteelQ195、Q215、Q235L175 -L483A、B、X42 ~ X70
    Sizebody ODD<508  ±0.75%DD≥508  ±1.00%DD<508  ±0.75%DD≥508  ±1.00%DD<508  ±0.75%D508≤D≤914   -0.25%D ~ +0.75%DD>914  -0.32%D ~ +6.35%D
    end ODD<508  ±0.75%D or ±2.5  be minimumD≥508  ±0.50%D or ±45   be minimumD≤273.1    -0.40 ~ +1.59D>323.9  -0.79 ~ +2.38D≤273.1    -0.40 ~ +1.59D>323.9  -0.79 ~ +2.38
    ToleranceW.T.<508±12.5%t-12.5%t ~ +12.5%t-12.5%t ~ +12.5%t
    ≥508±10.0%tL175 ~ L245 -10.0%t ~ +17.15%tL290 ~ L555  -8.0%t ~ +19.5%tNot beyond B class -12.5%t ~ +17.5%tNot lower than X42 -8.0%t ~ +19.5%t
    Oval tubeInner tube end range 100 ±1%DD>508 steel in the range from 101.6 max OD of the pipe end can not be larger than the DN of 1%D; smallest OD than the DN shall be 1% DD>508 steel in the range from 101.6 max OD of the pipe end can not be larger than the DN of 1%D; smallest OD than the DN shall be 1% D
    Curvature degree(straightness)Not exceed 0.2% of the pipe lengthNot exceed 0.2% of the pipe lengthNot exceed 0.2% of the pipe length
    Pipe end bevelingBevel degree 30° -35°  blunt edge1.6±0.8Bevel degree 30° -35°  blunt edge 1.59±0.79Bevel degree 30° -35°  blunt edge 1.59±0.79
    Tilt1.6≤D<813<1.59<1.59
    Misalignmentt≤12.70.35t and not more than 3.0<1.59<1.59
    t>12.70.25t0.1251 and 3.18  take the minimum value0.1251 and 3.18  take the minimum value
    Weld reinforcementt≤13…<3.2t>13  <4.8t≤12.7…<3.18t>12.7  <4.76t≤12.7…<3.18t>12.7  <4.76
    Chemical analysisTake one sample from each batchTake two samples from each batchTake two samples from each batch
    Tensile testTake one welded joint sample from each batchBase matel: take one sample from each smelting batchSpiral weld:take one sample from each smelting batch  butt weld: not more than 50 to take one sampleBase matel: take one sample from each smelting batchSpiral weld:take one sample from each smelting batch  butt weld: not more than 50 to take one sample
    Guided bend testNoEach batch take a positive test sample and an anti-bend bend sample,   butt weld no more than 50 to take a positive bend and an anti-bend sample.Each batch take a positive test sample and an anti-bend bend sample,   butt weld no more than 50 to take a positive bend and an anti-bend sample.
    Fracture toughness testingNoWhen the contract requirements,smelting complex batch takes three samples; D≥508, the drop hammer impact each smelting batch take two.When the contract requirements,smelting complex batch takes three samples; D≥508, the drop hammer impact each smelting batch take two.


  • Straight seam steel pipe production process





  • We have two kinds of packaging:

    1. Package suitable for every kind of transport;

    2. According to customer's requirement.



Product name: straight seam steel pipe

Materials: Q235, Q355, S195T, GR.B, X42, X52, X60, CC60, CC70, ST35, ST52, S235JR, S355JR, SGP, STP G370, STP

G410, GR12, GR2 etc. 

Standard: GB 3091, API 5L, ASTM A53, A515, A672, A500, A252, BS1387, EN10255, EN10217, JIS G3454 etc.

Specification:

Outer diameter: 1/4”-48” (13.7mm-1219.2mm).

Wall thickness: 1.2mm-60mm.

Length: 2m-14m.

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