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Continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and production method thereof

A hot-rolled steel plate and continuous casting billet technology, applied in the field of pipeline steel, can solve the problems of low yield ratio and high uniform elongation, and achieve the effect of low yield ratio and high uniform elongation

Inactive Publication Date: 2017-03-29
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hot-rolled steel plate for continuous casting slab with large wall thickness for deep-sea pipelines and its production method, which solves the problems of -20°C Charpy impact toughness and -20°C drop weight DWTT of hot-rolled steel plates for large-wall-thickness deep-sea pipelines. Toughness, low yield ratio, high uniform elongation, fracture toughness CTOD, A solution acid resistance HIC and SSCC, etc., to meet the construction of pipelines for deep-sea oil and gas fields

Method used

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  • Continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and production method thereof
  • Continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and production method thereof
  • Continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and production method thereof

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Embodiment 1~5

[0028] 1. The chemical composition of the hot-rolled steel plate for deep-sea pipelines in the embodiment is shown in Table 1 below:

[0029] Table 1 steel plate chemical composition (wt%)

[0030]

[0031] The above examples are all chemical composition weight percentages, and the balance is Fe and unavoidable impurity elements.

[0032] Two, embodiment technological system is as shown in table 2 below:

[0033] In the embodiment, the hot-rolled steel plate for the deep-sea pipeline is first continuously cast into a 400mm thick steel slab, and then undergoes reheating, two-stage controlled rolling, controlled cooling, and stacking slow cooling to obtain a fine and uniform polygonal ferrite structure, and the thickness of the finished steel plate is 41-48mm.

[0034]Table 2 embodiment technological system

[0035]

[0036] Three, embodiment mechanical properties are as shown in table 3 below:

[0037] The mechanical properties of the hot-rolled steel plates for deep-...

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Abstract

The invention discloses a continuous casting type large-wall-thickness hot-rolled steel plate for deep sea pipelines and a production method thereof, and belongs to the technical field of pipeline steel. The hot-rolled steel plate is composed of, by weight, 0.03-0.06% of C, 0.15-0.30% of Si, 1.20-1.35% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0012% of S, 0.01-0.05% of Alt, 0.03-0.05% of Nb, 0.00-0.05% of V, 0.005-0.016% of Ti, 0.25-0.40% of Ni, 0.00-0.30% of Cr, 0.00-0.20% of Cu, 0.00-0.15% of Mo and the balance Fe and inevitable impurity elements. Continuous castings with the thickness being 400 mm are adopted for producing the steel plate with the thickness being 41-48 mm. The steel plate and the production method thereof have the advantages that good metallographic structures are obtained, the Charpy impact toughness at -20 DEG C, the drop hammer toughness at -20 DEG C, the low yield ratio, the high uniform elongation rate, the anti-fracture toughness property CTOD, the A solution acid resistance HIC and SSCC, and the like of the large-wall-thickness hot-rolled steel plate for the deep sea pipelines are realized, and therefore the construction requirement of conveying pipelines of oil and gas fields of deep seas can be met.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel, in particular to a hot-rolled steel plate for continuous casting slab with large wall thickness and deep sea pipeline and a production method thereof. The product has low yield ratio, high uniform elongation, excellent low temperature toughness, fracture toughness, and acid resistance, and is suitable for the construction of pipelines for deep sea oil and gas fields. Background technique [0002] With the implementation of the national marine strategy power, the exploitation of oil and gas resources began to extend to the ocean, especially the deep sea area. According to statistics, there are only 28 billion tons of oil reserves in waters with a water depth of less than 200m, while deep sea waters with a depth of more than 200m are estimated to have oil reserves of 300 billion tons. As of 2015, the production of deep-sea oil fields has reached 25% of all offshore production, and the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C22C38/08C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D8/02
CPCC22C38/04C21D8/0226C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 李少坡丁文华谌铁强李群张海马长文白学军隋鹤龙刘建明周德光王立峰
Owner SHOUGANG CORPORATION
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