Welded steel pipe for high strength line pipe superior in...

Details Welded steel pipe for high strength line pipe superior in... Welded steel pipe for high strength line pipe superior in...

2007-11-30

2011-10-18

Austin, Aaron (Department: 1784)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S586000, C428S684000, C428S682000, C428S638000, C138S142000, C138S171000, C148S521000, C148S547000, C148S330000, C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C228S173400, C228S144000

Reexamination Certificate

active

08039118

ABSTRACT:
The present invention provides high strength welded steel pipe for line pipe inexpensive in cost and superior in low temperature toughness, and a method of production of the same, produced by forming a base material steel plate containing, by mass %, C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, S: 0.0001 to 0.0050%, and Ti: 0.003 to 0.030%, limiting Al to 0.020% or less and Mo to less than 0.10%, having a carbon equivalent Ceq of 0.30 to 0.53 and a crack susceptibility parameter Pcm of 0.10 to 0.20, comprised of polygonal ferrite and residual bainite of an area rate of 20% or less, and having an effective crystal grain size of 20 μm or less, into a pipe shape, then seam welding it and making the effective crystal grain size of the heat affected zone 150 μm or less.

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International Search Report dated Mar. 18, 2008 issued in corresponding PCT Application No. PCT/JP2007/073622.

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