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Steel for marine hose armor layers in deep sea and preparation method thereof

An armoring layer and marine technology, which is applied in the field of steel for the armoring layer of deep-sea marine hoses and its preparation, can solve the problems of expensive nickel-based alloys, resistance to hydrogen sulfide stress corrosion, hydrogen-induced cracking corrosion, and hydrogen embrittlement corrosion. It is difficult to meet the requirements, limit the use and development, etc., to achieve the effect of excellent mechanical properties, high strength and low cost

Active Publication Date: 2015-08-12
NORTHEASTERN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flat steel used needs to meet the requirements of high strength under deep sea service conditions, resistance to hydrogen sulfide stress corrosion, hydrogen induced cracking corrosion resistance, hydrogen embrittlement corrosion resistance, high temperature and high pressure CO 2 Corrosion and other corrosion properties, the current ordinary carbon steel can not meet the above requirements
As the depth of the ocean increases, the strength requirements of the flat steel used are higher; as the yield strength and tensile strength increase, it becomes more difficult to meet the requirements for hydrogen sulfide stress corrosion resistance, hydrogen-induced cracking corrosion resistance, and hydrogen embrittlement corrosion resistance. base alloys, and nickel-based alloys are very expensive, which limits the use and development

Method used

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  • Steel for marine hose armor layers in deep sea and preparation method thereof
  • Steel for marine hose armor layers in deep sea and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Smelt and cast according to the set composition to make continuous casting slab, its composition contains C 0.061%, Si 0.247%, Mn 1.48%, Cr 2.94%, Mo 0.31%, Al 0.02%, Ni 0.11%, S 0.003 by weight percentage %, P 0.015, the balance being Fe and unavoidable impurities;

[0033] Heat the continuous casting slab to 1220°C, control the heating rate at 6min / cm, and soak for 30min to make the austenite uniform, and control the temperature difference between the inside and outside of the continuous casting slab to be less than 30°C;

[0034] After the continuous casting slab is released from the furnace, hot rolling is completed on a high-speed wire rod rolling mill. The starting rolling temperature is 1150°C, the final rolling temperature is 920°C, and the compression ratio is 12; The spinning temperature is 810°C; the microstructure of the hot-rolled wire rod is as follows: figure 1 shown;

[0035] The hot-rolled wire rod after spinning is cooled on the Stelmo controlled coo...

Embodiment 2

[0040] It is smelted and cast according to the set composition to make continuous casting slab, and its composition contains C 0.12%, Si 0.35%, Mn 0.84%, Cr 2.16%, Mo 0.72%, Al 0.018%, Ni 0.23%, S 0.002% by weight %, P 0.013, the balance being Fe and unavoidable impurities;

[0041] Heat the continuous casting slab to 1160°C, control the heating rate at 8min / cm, and soak for 40min to make the austenite uniform, and control the temperature difference between the inside and outside of the continuous casting slab to be less than 30°C;

[0042] After the continuous casting slab is released from the furnace, it is hot-rolled on a high-speed wire rod mill. The starting temperature is 1120°C, the final rolling temperature is 930°C, and the compression ratio is 10; The spinning temperature is 830°C;

[0043] After spinning, the hot-rolled wire rod is cooled on the Stelmo controlled cooling line, and the delay type cooling is adopted with an insulating cover, the cooling rate is contr...

Embodiment 3

[0048] It is smelted and cast according to the set composition to make a continuous casting slab, and its composition contains C 0.16%, Si 0.49%, Mn 1.26%, Cr 1.11%, Mo 0.98%, Al 0.028%, Ni 0.28%, S 0.002% by weight %, P 0.012, the balance being Fe and unavoidable impurities;

[0049] Heat the continuous casting slab to 1150°C, control the heating rate at 10min / cm, and soak for 50min to make the austenite uniform, and control the temperature difference between the inside and outside of the continuous casting slab to be less than 30°C;

[0050] After the continuous casting slab is released from the furnace, it is hot-rolled on a high-speed wire rod rolling mill. The starting rolling temperature is 1100°C, the final rolling temperature is 950°C, and the compression ratio is 8; The spinning temperature is 850°C;

[0051] After spinning, the hot-rolled wire rod is cooled on the Stelmo controlled cooling line, and the delay type cooling is adopted with an insulating cover, the coo...

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Abstract

The invention relates to a steel for marine hose armor layers in deep sea and a preparation method thereof, belonging to the technical field of metallurgy. The steel comprises the following components in percentage by weight: 0.06-0.16% of C, 0.10-0.50% of Si, 0.8-1.5% of Mn, 1.0-3.0% of Cr, 0.3-1.0% of Mo, 0.01-0.03% of Al, at most 0.3% of Ni, at most 0.003% of S, at most 0.015% of P, and the balance of Fe and inevitable impurities. The tensile strength is 800-840 MPa, the yield strength is 720-795 MPa, and elongation percentage is 14.1-16.3%. The method comprises the following steps: (1) smelting and casting; (2) heating to 1150-1220 DEG C, and soaking for 30-50 minutes; (3) carrying out hot rolling, cooling with water, and spinning; (4) slowly cooling, and coiling; (5) carrying out cold drawing to obtain cold-drawn flat steel; and (6) carrying out hardening and tempering heat treatment. The steel for marine hose armor layers in deep sea has the advantages of excellent acid corrosion resistance and excellent mechanical properties. The method is low in cost. The product has favorable comprehensive properties.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel for an armor layer of a marine hose used in deep sea and a preparation method thereof. Background technique [0002] my country is rich in offshore oil and gas resources, and going to the ocean is a strategic development need to ensure my country's energy security. With the expansion of offshore oil development to deeper waters, marine hoses have broad application prospects in marine pipelines. Most of the existing submarine pipes are carbon steel hard pipes, but the metal anti-corrosion performance is poor. The length of carbon steel pipes is usually 12 meters, and special pipe-laying ships are required for laying operations. The laying at sea is difficult and expensive, and there are many joints and hidden dangers. Many, and the construction progress is slow, the daily cost is more than one million yuan, and the efficiency is low. In contrast, marine ho...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/22
Inventor 高秀华杜林秀刘珍光吴波匡晔
Owner NORTHEASTERN UNIV
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