Steel for ultrahigh-strength marine hose and preparation method of steel

An ultra-high-strength, marine technology, applied in the field of metallurgy, can solve the problems of high strength and stress corrosion cracking resistance, and cannot meet the requirements of sulfide stress corrosion cracking resistance, and achieve energy saving, good hydrogen damage resistance, and easy control Effect

Active Publication Date: 2019-02-22
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, aiming at solving the contradictory relationship between high strength and stress corrosion cracking resistance, to provide a steel for ultra-high strength (ReL≥800MPa) marine hose and its preparation method, Solve the problem that steel for ultra-high-strength hose cannot meet the resistance to sulfide stress corrosion cracking

Method used

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  • Steel for ultrahigh-strength marine hose and preparation method of steel
  • Steel for ultrahigh-strength marine hose and preparation method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A steel for ultra-high-strength marine hose, including components and weight percentages: C 0.07%, Si 0.23%, Mn 0.47%, P 0.005%, S 0.003%, Cr 1.04%, Mo 1.5%, Ni 0.29%, Nb 0.04%, Ti0.015%, and the balance is Fe and unavoidable impurities.

[0032] The preparation method of the steel for the ultra-high-strength marine hose comprises the following steps:

[0033] Smelting, refining and continuous casting into continuous casting slabs according to the set composition, heating the slab to 1200°C and keeping it warm for 40 minutes to homogenize the structure and composition, and then the billet is hot rolled to a Φ10mm wire rod by a high-speed wire rolling mill, and the rolling temperature is 1150 ℃, the final rolling temperature is 940℃, water cooling after rolling, the spinning temperature is 810℃, and the coiling temperature is slowly cooled to 400℃. The microstructure after hot rolling is specifically shown in the electronic probe diagram figure 1 As shown, it is a baini...

Embodiment 2

[0039] A steel for ultra-high-strength marine hose, including components and weight percentages: C 0.1%, Si 0.38%, Mn 0.89%, P 0.008%, S 0.002%, Cr 1.5%, Mo 1.0%, Ni 0.5%, Nb 0.045%, Ti0.015%, the balance is Fe and unavoidable impurities.

[0040] The preparation method of the steel for the ultra-high-strength marine hose comprises the following steps:

[0041]Smelting, refining and continuous casting into continuous casting slab according to the set composition, heating the slab to 1170°C and keeping it warm for 60 minutes to homogenize the structure and composition, and then the billet is hot rolled to a Φ20mm wire rod by a high-speed wire rolling mill, and the rolling temperature is 1140 ℃, final rolling temperature 950 ℃, water cooling after rolling, spinning temperature 830 ℃, slow cooling to coiling temperature 420 ℃;

[0042] The hot-rolled wire rod is cooled to room temperature, and after removing the iron scale, it undergoes 5 passes of cold rolling to obtain the fla...

Embodiment 3

[0047] A steel for ultra-high-strength marine hose, including components and weight percentages: C 0.04%, Si 0.44%, Mn 0.69%, P 0.006%, S 0.002%, Cr 1.41%, Mo 1.26%, Ni 0.2%, Nb 0.036%, Ti0.01%, the balance is Fe and unavoidable impurities;

[0048] The preparation method of the steel for the ultra-high-strength marine hose comprises the following steps:

[0049] Smelting, refining and continuous casting into continuous casting slabs according to the set composition, heating the slab to 1220°C for 30 minutes to homogenize the structure and composition, and then hot rolling the slab to a Φ16mm wire rod through a high-speed wire rolling mill, and the rolling temperature is 1150 ℃, final rolling temperature 970 ℃, water cooling after rolling, spinning temperature 820 ℃, slow cooling to coiling temperature 430 ℃;

[0050] The hot-rolled wire rod is cooled to room temperature, and after removing the iron scale, it undergoes 5 passes of cold rolling to obtain the flat steel require...

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Abstract

The invention discloses a steel for an ultrahigh-strength marine hose and a preparation method of the steel. The steel for the ultrahigh-strength marine hose comprises the following components, by weight, 0.04-0.10% of C, less than of equal to Si, 0.4-1.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0. 003% of S, 1.0-1.5% of Cr, 1.0-1.5% of Mo, 0.2-0.5% of Ni, 0.035-0.045% of Nb, 0.01-0.015% of Ti, and the balance Fe and inevitable impurities; the method comprises the following steps that a casting blank is prepared according to a set component; heating of the casting blankis carried out to a corresponding temperature and then the temperature preservation is carried out, then hot rolling is carried out to form a coiled strip, and the coiled strip is cooled to the room temperature; when iron oxide skin is removed, several passes of cold rolling are carried out to obtain flat steel; and two thermal refining are carried out to obtain a finished product. The preparationmethod is simple in process, easy to control, and capable of saving energy consumption; the prepared finished product has ultrahigh strength and good hydrogen damage resistance, the anti-stress corrosion cracking performance is especially excellent, and the performance requirement of the marine hose serving under a severe environment can be met.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel for ultra-high strength marine hoses and a preparation method thereof. Background technique: [0002] The development of oil and gas resources from land to shallow sea and then to deep sea is the general trend of global oil and gas resources development, and it is also the strategic goal of my country's oil and gas resources development. In the process of developing offshore oil and gas resources, marine flexible hoses are more and more widely used due to their many superior properties (strong corrosion resistance, strong terrain adaptability, long continuous length, easy laying and installation, economical and durable). With the continuous application and development of marine hoses, marine hoses are currently developing in the direction of high strength, weight reduction, high compliance, fatigue resistance, and sulfide stress corrosion cracking resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D8/00C22C33/04C22C38/02C22C38/04C22C38/48C22C38/50
CPCC21D8/005C22C33/04C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50
Inventor 高秀华张大征杜林秀王鸿轩杨宁宁宫照亮
Owner NORTHEASTERN UNIV
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