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Hot-rolled steel plate for submarine conveying pipe and preparation method thereof

A technology for hot-rolled steel plates and pipes is applied in the field of hot-rolled steel plates for submarine conveying pipes and their preparation, and can solve problems such as deformation, buckling and plastic deformation of steel pipes.

Active Publication Date: 2020-08-14
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, waves and currents in the marine environment may cause plastic deformation, resulting in deformation and buckling of steel pipes.

Method used

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  • Hot-rolled steel plate for submarine conveying pipe and preparation method thereof
  • Hot-rolled steel plate for submarine conveying pipe and preparation method thereof
  • Hot-rolled steel plate for submarine conveying pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]A hot-rolled steel plate for seabed transportation pipes. In terms of mass percentage, the chemical composition of the hot-rolled steel plate includes: C: 0.031%, Si: 0.21%, Mn: 1.45%, Al: 0.03%, Nb: 0.035%, Ti: 0.015%, Ni: 0.43%, Cr: 0.20%, Mo: 0.15%, P: 0.007%, S: 0.001%, and the balance is Fe and unavoidable impurity elements.

[0038] The above-mentioned hot-rolled steel sheet is composed of fine-grained ferrite and acicular ferrite, wherein the proportion of fine-grained ferrite is 22.6%.

[0039] The preparation method of the hot-rolled steel plate for the above-mentioned seabed delivery pipe is as follows:

[0040] S1: cast molten steel that has been smelted and melted into steel billets by continuous casting machine, and the steel billets are sent into the heating furnace. The heating furnace is heated at a rate of 20°C / min, heated to 1080°C, and kept at this temperature for heat preservation 30min;

[0041] S2: rolling the heated billet 10 times on the roughin...

Embodiment 2

[0045] A hot-rolled steel plate for seabed transportation pipes. In terms of mass percentage, the chemical composition of the hot-rolled steel plate includes: C: 0.035%, Si: 0.20%, Mn: 1.46%, Al: 0.03%, Nb: 0.036%, Ti: 0.012%, Ni: 0.43%, Cr: 0.20%, Mo: 0.12%, P: 0.007%, S: 0.001%, and the balance is Fe and unavoidable impurity elements.

[0046] The above-mentioned hot-rolled steel sheet is composed of fine-grained ferrite and acicular ferrite, wherein the proportion of fine-grained ferrite is 35.8%.

[0047] The preparation method of the hot-rolled steel plate for the above-mentioned seabed delivery pipe is as follows:

[0048] S1: cast molten steel that has been smelted and melted into steel billets by continuous casting machine, and the steel billets are sent into the heating furnace. The heating furnace is heated at a rate of 20°C / min, heated to 1100°C, and kept at this temperature for heat preservation 28min;

[0049] S2: rolling the heated billet 10 times on the roughi...

Embodiment 3

[0053] A hot-rolled steel plate for seabed transportation pipes. In terms of mass percentage, the chemical composition of the hot-rolled steel plate includes: C: 0.035%, Si: 0.21%, Mn: 1.49%, Al: 0.03%, Nb: 0.037%, Ti: 0.015%, Ni: 0.44%, Cr: 0.23%, Mo: 0.13%, P: 0.007%, S: 0.001%, and the balance is Fe and unavoidable impurity elements.

[0054] The above-mentioned hot-rolled steel sheet is composed of fine-grained ferrite and acicular ferrite, wherein the proportion of fine-grained ferrite is 40%.

[0055] The preparation method of the hot-rolled steel plate for the above-mentioned seabed delivery pipe is as follows:

[0056] S1: cast molten steel that has been smelted and melted into steel billets by continuous casting machine, and the steel billets are sent into the heating furnace. The heating furnace is heated at a rate of 24°C / min, heated to 1100°C, and kept at this temperature for heat preservation 25min;

[0057] S2: rolling the heated billet 10 times on the roughing...

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Abstract

The invention relates to the technical field of metal material processing, in particular to a hot-rolled steel plate for a submarine conveying pipe and a preparation method thereof. The chemical components of the hot-rolled steel plate include 0.03-0.05% of C, 0.15-0.25% of Si, 1.40-1.60% of Mn, 0.02-0.04% of Al, 0.02-0.04% of Nb, 0.010-0.020% of Ti, 0.40-0.50% of Ni, 0.15-0.25% of Cr, 0.10-0.20%of Mo, 0.008% or less of P, 0.001% or less of S and the balance Fe and inevitable impurity elements. By innovating the chemical composition, the production process and the microstructure, the preparedhot-rolled steel plate has excellent mechanical properties and good welding performance, reduces the risk of deformation and fracture failure of the submarine conveying pipe under the influence of ocean waves, ocean currents, submarine earthquakes, faults and seabed collapse, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a hot-rolled steel plate for a submarine delivery pipe and a preparation method thereof. Background technique [0002] The submarine pipeline is the main way of oil and gas transmission in the development of offshore oil and gas fields. It is used to transport the oil and gas resources on the seabed to the production platform or land treatment plant through the pipeline. To prevent pipeline collapse accidents, deep-sea pipelines need to use large thickness-to-diameter ratio (t / D) steel pipes, and large t / D steel pipes make DWTT performance face a greater test. In addition, during the laying process of submarine pipelines, especially when using pipe-laying ships, they will be subjected to great compression, tension or bending deformation, and the pipeline will undergo certain plastic deformation. At the same time, waves and currents in the marine environment may...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/58C21D6/00C21D8/02C21D9/00
CPCC21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/58
Inventor 李少坡丁文华张海李战军樊艳秋王志勇李群马长文白学军田士平
Owner SHOUGANG CORPORATION
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