Crack initiation steel pipe for full-scale gas bursting test of large-diameter high-grade steel gas pipeline and preparation method thereof

Crack initiation steel pipe for full-scale gas bursting test of large-diameter high-grade steel gas pipeline and preparation method thereof

  • CN 102,242,311 A
  • Filed: 08/10/2011
  • Published: 11/16/2011
  • Est. Priority Date: 08/10/2011
  • Status: Active Application
First Claim
Patent Images

1. the full-scale gas blast test of large-caliber high-steel grade gas pipe line is split steel pipe with opening, it is characterized in that, the composition of described steel pipe comprises by mass percentage:

  • C;

    0.07%~

    0.12%, Mn;

    1.50%~

    1.75%, Si;

    0.15%~

    0.35%, P≤

    0.015%, S;

    0.010%~

    0.020%, Al;

    0.005%~

    0.03%, O≤

    0.002%, H≤

    0.00015%, N≤

    0.005%, surplus are Fe, wherein, carbon equivalent≤

    0.55%, cold crack sensitivity coefficient≤

    0.28%, the caliber of described steel pipe are 760mm~

    1422mm, the wall thickness 12mm~

    30mm of described steel pipe, the grade of steel of described steel pipe is X80, X90, the X100 grade of steel, its yield strength 550Mpa~

    840Mpa, its tensile strength 625Mpa~

    990Mpa, its summer of 0 ℃

    is controlled between 100J~

    200J than impacting toughness, drop weight test fracture shear area 〉

    =85% opens that to split the back fracture be the ductile fracture pattern and does not have obvious fracture and separate and occur.

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