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A kind of acid-resistant ultra-high-strength steel for deep-sea dynamic flexible riser and its preparation method

A technology of ultra-high-strength steel and flexible riser, which is applied in the field of metallurgy, can solve the problems of inability to be applied on a large scale, poor resistance to sulfide stress corrosion cracking, and high price of stainless steel, and achieves easy industrial production, good fatigue resistance, and preparation low cost effect

Active Publication Date: 2020-01-14
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the higher the strength of the steel, the worse the resistance to sulfide stress corrosion cracking, so the steel used in the deep sea dynamic flexible riser can not meet the above two properties at the same time, although the use of stainless steel as a reinforcing material can meet the performance requirements, but due to the high price of stainless steel , resulting in the impossibility of large-scale application

Method used

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  • A kind of acid-resistant ultra-high-strength steel for deep-sea dynamic flexible riser and its preparation method
  • A kind of acid-resistant ultra-high-strength steel for deep-sea dynamic flexible riser and its preparation method
  • A kind of acid-resistant ultra-high-strength steel for deep-sea dynamic flexible riser and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The ultra-high-strength steel for deep-sea dynamic flexible risers of the present invention has the following chemical composition by weight percentage: C: 0.1%, Si: 0.21%, Mn: 1.4%, P: 0.02%, S: 0.008%, Cr: 2.0%, Mo : 1.5%, Ni: 0.8%, Nb: 0.045%, Ti: 0.018%, the balance is Fe and unavoidable impurities;

[0040] The preparation method of the ultra-high-strength steel for the deep-sea dynamic flexible riser of the present invention is carried out according to the following steps:

[0041] Step 1, casting:

[0042] Smelting, refining and pouring according to the set composition to make a slab, the composition of the slab by weight percentage is: C: 0.1%, Si: 0.21%, Mn: 1.4%, P: 0.02%, S: 0.008%, Cr: 2.0 %, Mo: 1.5%, Ni: 0.8%, Nb: 0.045%, Ti: 0.018%, the balance is Fe and unavoidable impurities;

[0043] Step 2, heating and rolling:

[0044] (1) Heat the billet to 1220°C and keep it warm for 50 minutes to homogenize the structure and composition;

[0045] (2) Using a h...

Embodiment 2

[0052] The ultra-high-strength steel for deep-sea dynamic flexible risers of the present invention has the following chemical composition by weight percentage: C: 0.04%, Si: 0.28%, Mn: 0.4%, P: 0.01%, S: 0.005%, Cr: 0.82%, Mo : 0.83%, Ni: 0.35%, Nb: 0.014%, Ti: 0.011%, the balance is Fe and unavoidable impurities;

[0053] The preparation method of the ultra-high-strength steel for the deep-sea dynamic flexible riser of the present invention is carried out according to the following steps:

[0054] Step 1, casting:

[0055] Smelting, refining and pouring according to the set composition to make cast slab, the composition of cast slab by weight percentage is: C: 0.04%, Si: 0.28%, Mn: 0.4%, P: 0.01%, S: 0.005%, Cr: 0.82 %, Mo: 0.83%, Ni: 0.35%, Nb: 0.014%, Ti: 0.011%, the balance is Fe and unavoidable impurities;

[0056] Step 2, heating and rolling:

[0057] (1) Heat the billet to 1180°C and keep it warm for 50 minutes to homogenize the structure and composition;

[0058] (...

Embodiment 3

[0065] The ultra-high-strength steel for deep-sea dynamic flexible risers of the present invention has the following chemical composition by weight percentage: C: 0.048%, Si: 0.34%, Mn: 1.04%, P: 0.008%, S: 0.004%, Cr: 1.45%, Mo : 1.18%, Ni: 0.53%, Nb: 0.038%, Ti: 0.014%, the balance is Fe and unavoidable impurities;

[0066] The preparation method of the ultra-high-strength steel for the deep-sea dynamic flexible riser of the present invention is carried out according to the following steps:

[0067] Step 1, casting:

[0068] Smelting, refining and pouring according to the set composition to make a slab, the composition of the slab by weight percentage is: C: 0.048%, Si: 0.34%, Mn: 1.04%, P: 0.008%, S: 0.004%, Cr: 1.45 %, Mo: 1.18%, Ni: 0.53%, Nb: 0.038%, Ti: 0.014%, the balance is Fe and unavoidable impurities;

[0069] Step 2, heating and rolling:

[0070] (1) Heat the billet to 1200°C and keep it warm for 30 minutes to homogenize the structure and composition;

[0071]...

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Abstract

The invention relates to acid-resistant ultrahigh-strength steel for a deep-sea dynamic flexible vertical pipe and a preparation method of the acid-resistant ultrahigh-strength steel and belongs to the technical field of metallurgy. The steel comprises, by weight percentage, 0.04-0.1% of C, not more than 0.4% of Si, 0.3-1.4% of Mn, not more than 0.02% of P, not more than 0.008% of S, 0.8-2.0% of Cr, 0.8-1.5% of Mo, 0.3-0.8% of Ni, 0.012-0.045% of Nb, 0.01-0.02% of Ti and the balance Fe and inevitable impurities. The preparation method includes: performing smelting, refining and pouring according to the set components to obtain continuous casting billets; secondly, performing heating and heat preservation on the continuous casting billets, and performing multi-pass hot rolling to obtain hot-rolled wire rods; performing multi-pass cold rolling to obtain the Z-shaped steel for a dynamic flexible vertical pipe; thirdly, performing heating and heat preservation on the Z-shaped steel, and performing water quenching to allow the Z-shaped steel reach room temperature; annealing to obtain the ultrahigh-strength steel for the deep-sea dynamic flexible vertical pipe. The microscopic structureof the ultrahigh-strength steel is of a tempered martensite structure, the yield strength of the ultrahigh-strength steel is not smaller than 800MPa, the tensile strength of the ultrahigh-strength steel is not smaller than 880MPa, and the ductility of the ultrahigh-strength steel is not smaller than 10%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an acid-resistant ultra-high-strength steel for deep-sea dynamic flexible risers and a preparation method thereof. Background technique [0002] At present, with the continuous exploitation of offshore oil and gas resources, the development of offshore oil and gas resources from shallow sea to deep sea has become the general trend of the development of marine oil and gas resources in the world, and it is also the strategic goal of the development of offshore oil and gas resources in my country. During the exploitation of deep sea oil and gas resources, a large number of pipelines are required, among which the riser used to connect the subsea wellhead and the offshore platform is an essential part of oil and gas transportation. Marine risers are divided into hard steel pipes and dynamic flexible risers. With the deepening of oil and gas exploitation, traditional har...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50C21D8/06C21D1/25
CPCC21D1/25C21D8/065C21D2211/008C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50
Inventor 高秀华张大征杜林秀王鸿轩杨宁宁
Owner NORTHEASTERN UNIV LIAONING
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