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Low yield ratio dual phase steel linepipe with superior strain aging resistance

A dual-phase steel, yield ratio technology, applied in the field of line pipe, can solve the problem of damage to the strain capacity of line pipe

Active Publication Date: 2013-01-09
EXXONMOBIL RESEARCHK & ENG CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the reasons mentioned above, this migration impairs the strain capacity of the linepipe

Method used

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  • Low yield ratio dual phase steel linepipe with superior strain aging resistance
  • Low yield ratio dual phase steel linepipe with superior strain aging resistance
  • Low yield ratio dual phase steel linepipe with superior strain aging resistance

Examples

Experimental program
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Embodiment

[0086] The foregoing discussion may be further illustrated by reference to the following non-limiting examples.

[0087] Four steel precursors (steels A, B, C, D and E) were prepared from melts having the chemical composition shown in Table 1 . Each precursor was prepared by vacuum induction melting 150 kg of melt and casting into billets, or using a 250 ton industrial basic oxygen top-blown converter and continuously casting into billets. From these steel precursors (steels A, B, C, D and E) steel sheets (Examples 1-8) were prepared according to the processing conditions summarized in Table 2. Examples 1-7 represent inventive steels, while Example 8 represents a comparative or conventional DP steel.

[0088] Table 1: Steel composition (weight %)

[0089]

steel

C

mn

P *

S *

Si

Cu

Ni

Cr

Mo

Nb

V

Ti *

T. Al *

B *

CE

Pcm

A

0.050...

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Abstract

A steel composition and method from making a dual phase steel therefrom. In at least one embodiment, the dual phase steel comprises carbon in an amount of about 0.05% by weight to about 0.12 wt%; niobium in an amount of about 0.005 wt % to about 0.03 wt%; titanium in an amount of about 0.005 wt% to about 0.02 wt%; nitrogen in an amount of about 0.001 wt% to about 0.01 wt%; silicon in an amount of about 0.01 wt% to about 0.5 wt%; manganese in an amount of about 0.5 wt% to about 2.0 wt%; and a total of molybdenum, chromium, vanadium and copper less than about 0.15 wt%. The steel has a first phase consisting of ferrite and a second phase comprising one or more constituents selected from the group consisting of carbide, pearlite, martensite, lower bainite, granular bainite, upper bainite, and degenerate upper bainite. A solute carbon content in the first phase is about 0.01 wt% or less.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 60 / 850216, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to linepipe, and more particularly to low yield ratio dual phase steel linepipe with excellent strain aging resistance and a method of making the same. Background technique [0004] Natural gas is becoming an increasingly important energy source. The world's major natural gas fields are often far from major markets. Thus, linepipe may have to traverse long distances on land or underwater, which can cause severe strain on the linepipe. Seismically active regions and arctic regions subject to cycles of frost heave and thaw settlement can cause severe strain on line pipe. Linepipes laid across the seabed are also subject to severe strain due to displacement or bending caused by water currents. [0005] Therefore, lin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C21D1/04
CPCC21D9/085C22C38/14C21D8/0205C22C38/02C21D8/0226C22C38/04C22C38/12C22C38/08C22C38/001
Inventor J・丘N・V・邦加鲁H-W・陈A・奥赞克辛R・阿伊尔D・P・费尔凯尔德D・L・比森D・S・霍伊特小J・B・莱博卢远藤茂冈津光浩柿原真一长江守康
Owner EXXONMOBIL RESEARCHK & ENG CO