Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate

A technology of X65-X80 and manufacturing method, applied in the field of low-alloy high-strength steel manufacturing, can solve the problems of insufficient cooling strength at the center of thickness, low carbon content, uneven performance of steel plates, etc., to meet the requirements of yield and tensile strength, high yield and Tensile strength, the effect of solving the problem of hardenability
CN104404378AInactive Publication Date: 2015-03-11SHANDONG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG IRON & STEEL CO LTD
Publication Date
2015-03-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and a manufacturing method of the wide and thick steel plate. Especially, proper ingredients, structures and technologies for the steel plate for the elbow pipes at X65, X70 and X80 levels are designed respectively according to different pipe bending technologies of pipe bending factories, and the pipeline steel performance requirement for reaching the related strength levels after hot bending of the pipes is met. The steel plate is 20-40 mm thick and 2,500-4,000 mm wide, the hot-rolled steel plate with excellent toughness, thermal formability and thermal stability is obtained, a solution is provided for steel plates for high-pressure elbow pipes in long delivery pipeline projects, and the usage security of the high-level pipeline steel plate is improved.
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Description

technical field

[0001] The invention belongs to the technical field of low-alloy high-strength steel manufacturing, and relates to a hot-rolled steel plate of X65, X70 and X80 grades for bending pipes in oil and gas pipelines and a manufacturing method thereof. Background technique

[0002] With the vigorous development of my country's oil and gas pipelines, submarine crude oil and coal-water slurry and other fluid pipeline construction projects, an average of 3.5-4 million tons of pipelines are required per year, and oil and gas pipelines pass through many complex terrains and harsh weather conditions. Therefore, a large number of high-pressure bent pipes need to be used in pipeline laying, and the annual market demand is maintained at about 500,000 tons, which has a broad market prospect.

[0003] The curved pipe in the pipeline, commonly known as the "waist" of the pipeline, can change the direction of the pipeline according to the needs; secondly, it can buffer the pull, ...

Claims

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