X65 hot-rolled steel plate for marine riser and preparation method of steel plate

A hot-rolled steel plate, X65 technology, applied in the field of X65 hot-rolled steel plate for marine risers and its preparation, can solve the problems of acid corrosion resistance, low-temperature toughness, low yield ratio, etc., to achieve fine core grains, low yield Strength ratio, the effect of improving strength and ultra-low temperature toughness

Active Publication Date: 2019-08-09
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a X65 hot-rolled steel plate for marine risers and a preparation method thereof, which solves the problem of obtaining high strength, low yield ratio, low temperature toughness, fracture resistance, easy welding, and acid corrosion problem

Method used

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  • X65 hot-rolled steel plate for marine riser and preparation method of steel plate
  • X65 hot-rolled steel plate for marine riser and preparation method of steel plate
  • X65 hot-rolled steel plate for marine riser and preparation method of steel plate

Examples

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Embodiment 1

[0041] This embodiment provides a preparation method of X65 hot-rolled steel plate for marine riser, the steps include:

[0042] 1) Continuous casting produces high-clean, extra-thick continuous casting slabs that meet the chemical composition requirements. The central segregation is controlled at Class C 0.5, and the non-metallic inclusions of A / B / C / D are controlled within 1.5. The thickness of the continuous casting slab And the specific chemical composition is shown in Table 1. The central segregation of the continuous casting slab is well controlled, such as figure 1 shown;

[0043] 2) The differential temperature rolling process is adopted in the rough rolling stage, and the surface of the billet is cooled by spraying high-pressure water to form a temperature gradient in the thickness section of the billet, so that the surface temperature of the billet is lower than that of the core, so that the rolling deformation can fully penetrate into the core of the billet , refine...

Embodiment 2-5

[0051] The present invention further provides embodiments 2-5, and embodiments 2-5 respectively provide a preparation method of X65 hot-rolled steel plates for marine risers, the specific steps of which are basically the same as those in embodiment 1, adopting 400mm continuous casting slab, continuous casting The segregation in the center of the slab is well controlled, and then the continuous casting slab undergoes rough rolling, three-stage finish rolling, cooling and other processes, and the steel plate obtains a fine and uniform structure of ferrite + a small amount of acicular ferrite, and the structure of the surface and core of the steel plate is uniform sex is good. The difference from Example 1 lies in the chemical composition of the steel plate and some process parameters, as shown in Table 1 and Table 2 for details.

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Abstract

The invention provides an X65 hot-rolled steel plate for a marine riser and a preparation method. The X65 hot-rolled steel plate is prepared from, by weight, 0.03%-0.05% of C, 0.10%-0.30% of Si, 1.10%-1.35% of Mn, smaller than or equal to 0.007% of P, smaller than or equal to 0.0008% of S, 0.01%-0.05% of Alt, 0.04%-0.06% of Nb, 0.008%-0.018% of Ti, 0.20%-0.40% of Ni, 0.15%-0.30% of Cr, 0.10%-0.20%of Mo, smaller than or equal to 0.004% of N and the balance Fe and unavoidable impurity elements. The preparation method comprises the steps that continuous casting blanks with the thickness rangingfrom 300 mm to 500 mm are adopted, differential temperature rolling is adopted for steel blank rough rolling, three-stage rolling is adopted for finish rolling, and then fine and squashed hardened austenite grains are obtained; steel plates are cooled after being rolled, and then fine ferrites and a small amount of acicular ferrite structure are obtained, wherein the initial cooling temperature ranges from 760 DEG C to 780 DEG C, and the final cooling temperature ranges from 200 DEG C to 300 DEG C. The X65 hot-rolled steel plate has the advantages of being large in wall thickness, high in strength, low in yield ratio, excellent in low-temperature toughness, fracture resistance and acid resistance and capable of reducing the fracture and corrosion risks of marine risers.

Description

technical field [0001] The invention belongs to the technical field of marine risers, and in particular relates to an X65 hot-rolled steel plate for marine risers and a preparation method thereof. Background technique [0002] The vigorous development of offshore oil and gas development has made offshore riser technology the forefront of technological innovation in the world's petroleum industry. Offshore riser is an important part in the construction of offshore oil and gas resource development projects. At present, the United States, Japan, Germany, Brazil, Norway, Italy and other countries are at the world's advanced level in terms of marine riser technology and equipment. my country's marine riser development and laying capacity is far below the international advanced level, and the research on marine risers has just started. my country's sea area is vast, and there are about 30 billion tons of oil and gas reserves in the deep waters of the south-central South China Se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/44C21D8/02
CPCC21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50
Inventor 李少坡张海丁文华李战军李群马长文白学军
Owner SHOUGANG CORPORATION
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