X80 and below steel grade pipeline steel for deep-sea drilling marine riser and preparation method thereof

A technology for riser and pipeline steel, which is applied to pipeline steel below X80 steel grade, which requires uniform vertical and horizontal strength and dual hardness requirements. X80 pipeline steel and its manufacturing field can solve the problem of not mentioning the transverse tensile properties and longitudinal and transverse tensile strength. Uniformity, there is no mention of scour surface hardness requirements, etc., to achieve the effect of uniform vertical and horizontal strength
CN106367685AActive Publication Date: 2017-02-01JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
Publication Date
2017-02-01

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Abstract

The invention relates to X80 and below steel grade pipeline steel for a deep-sea drilling marine riser which comprises the chemical components in percentages by mass: 0.04-0.08% of C, 1.7-1.85% of Mn, 0.25-0.45% of Si, less than or equal to 0.001% of S, less than or equal to 0.010% of P, 0.02-0.04% of Nb, 0.008-0.03% of Ti, 0.01-0.06% of V, less than or equal to 0.06% of Alt, less than or equal to 0.010% of N, less than or equal to 0.006% of O, less than or equal to 0.30% of Mo, less than or equal to 0.30% of Cu, 0.15-0.35% of Ni, 0.15-0.45% of Cr, less than or equal to 0.01% of Ca and the balance of Fe and inevitable impurities. A steel plate smelting process route is as follows: material preparation; converter or electric furnace smelting; external refining; continuous casting; slab reheating; special TMCP process; and air cooling to room temperature. The steel provided by the invention can obviously improve the mechanical property of the deep-sea drilling marine riser.
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Description

technical field

[0001] The invention relates to the technical field of risers for deep-sea drilling, in particular to an X80 pipeline steel with uniform vertical and horizontal strength and double hardness requirements and a manufacturing method thereof. The invention is also applicable to pipeline steels below the X80 steel grade. Background technique

[0002] At present, fossil energy still occupies a dominant position in the energy structure in the energy demanded by the world. In recent years, the rapid growth of the world economy has greatly driven the rapid growth of fossil energy demand. . Energy extraction has turned to the sea. Steel for marine pipelines involves the fields of oil drilling and oil transportation. Due to the high pressure in the deep sea and the influence factors such as ocean currents during drilling, it is usually necessary to use high-grade thicker steel plates to make deep-sea risers during drilling to ensure smooth drilling operations. Consid...

Claims

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