Design of thick plate for deep water pipeline based on plastic deformation and crush resistance and its production method

Abstract

The invention provides a thick plate for deep-water pipeline design based on plastic deformation and crush resistance and a production method thereof. The composition of the thick plate is as follows by weight percentage: C: 0.035%-0.065%, Si: 0.26%-0.40 %, Mn: 1.30%~1.49%, P≤0.010%, S≤0.0015%, Nb: 0.02%~0.05%, Ti: 0.012%~0.030%, Ni: 0.06%~0.18%, Cu: 0.06%~0.15 %, Cr: 0.11%~0.29%, Al: 0.010%~0.025%, N: 0.0010%~0.0040%, Ca: 0.0015%~0.0040%, Ca / S≥1.6, and the balance is iron and unavoidable impurities. The production method includes converter smelting, refining outside the furnace, continuous casting, heating, rolling, and cooling; the thickness of the deep-water pipeline thick plate produced by the present invention is >30mm, and the transverse yield ratio is not more than 0.85; the longitudinal yield strength is 430-510MPa, and the longitudinal yield strength Tensile strength 540 ~ 630MPa, longitudinal uniform elongation U EL ≥10%, the longitudinal yield ratio does not exceed 0.84; the strain hardening index n≥0.1.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a thick plate for deepwater pipelines with a thickness of >30 mm, low yield ratio, high uniform deformation rate, high strain hardening index, corrosion resistance and high fatigue strength, and a production method thereof . Background technique [0002] Offshore oil and gas resources are an important part of oil and natural gas resources and an important direction for future oil and gas resource exploitation. Most of the marine oil and gas resources are distributed in the deep water areas with a water depth of 1000m or even more than 2000m. It is necessary to build a special deepwater oil and gas production and transportation system to exploit, and the deepwater oil and gas transportation pipeline is an important part of it. [0003] Deepwater pipelines will face a variety of complex and harsh conditions such as plastic deformation, high water pressure and ocean un...

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to overcome the above-mentioned problems and deficiencies and provide a deep-water pipeline with thick wall, small diameter-to-thickness ratio, high strength, high toughness, low yield ratio, high uniform deformation rate, high strain hardening index, corrosion resistance To solve the problem of matching technical indicators such as high fatigue strength, provide a thick-walled deep-water pipeline with a thickness >30mm, low yield ratio, high uniform deformation rate, high strain hardening index, corrosion resistance and high fatigue strength based on plastic deformation and Slabs for crush resistance design deepwater pipelines and methods of production thereof

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