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A kind of manufacturing method of x70m pipeline steel plate used under low-cost and ultra-low temperature conditions

A manufacturing method and ultra-low temperature technology, applied in the field of X70M pipeline steel plate manufacturing, can solve the problems of high requirements for pipeline steel, limited plant design, and less research

Active Publication Date: 2022-04-22
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on X70M pipeline steel products that can be used under low temperature conditions and are produced by hot charging and hot delivery. On the one hand, they are limited by the design of steelmaking and rolling workshops; High, especially the requirements for internal segregation and H content of the billet are high, so the use of hot charging and hot delivery technology for production will bring greater production difficulties to enterprises, and there are relatively few related researches

Method used

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  • A kind of manufacturing method of x70m pipeline steel plate used under low-cost and ultra-low temperature conditions
  • A kind of manufacturing method of x70m pipeline steel plate used under low-cost and ultra-low temperature conditions
  • A kind of manufacturing method of x70m pipeline steel plate used under low-cost and ultra-low temperature conditions

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Embodiment 1-2

[0041] According to the chemical composition range and manufacturing method of the present invention, KR molten iron pretreatment - BOF smelting - RH vacuum degassing - LF refining - RH vacuum degassing - 150mm thickness continuous casting billet continuous casting - continuous casting billet inspection and cleaning - hot charging Sending - billet heating - high-pressure water descaling - rolling - ACC cooling - straightening - steel plate shearing - inspection and storage process steps to manufacture X70M pipeline steel plates used under low-cost and ultra-low temperature conditions.

[0042] The specific process of the above heating, rolling and cooling is as follows: heating the 150mm thick continuous casting slab from 670°C to 1120°C, keeping the soaking section for 40 minutes (Example 1) or heating the 150mm thick continuous casting slab from 660°C to 1100°C, The soaking section was kept for 30 minutes (Example 2), and the continuous casting billet was removed from the fur...

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Abstract

The invention relates to a manufacturing method of X70M pipeline steel plate used under low-cost and ultra-low temperature conditions, KR molten iron pretreatment-BOF smelting-RH vacuum degassing-LF refining-RH vacuum degassing-150mm thickness continuous casting slab continuous casting-continuous Billet inspection and cleaning—350~680°C hot charging and hot delivery—casting billet heating—high pressure water descaling—rolling—ACC cooling—straightening—steel plate shearing—inspection of warehousing process steps, low-cost manufacturing and use under ultra-low temperature conditions X70M pipeline steel plate. The pipeline steel plate produced by hot charging and hot delivery process, ultra-low C, micro-alloy composite addition and controlled rolling and controlled cooling process can meet the Charpy impact energy of ‑80 °C ≥ 120J and the drop hammer shear area of ​​‑20 °C ≥ 85%. Requirements for use under ultra-low temperature conditions.

Description

technical field [0001] The invention relates to a manufacturing method of X70M pipeline steel plate. Background technique [0002] For X70M pipeline steel plate, M means deformation heat treatment, which means that the delivery state of the material is heat treatment state. Oil and natural gas are important energy sources for the development of industrialization, the blood of economic development, and provide a driving force for social progress. Oil and natural gas are still the core of the entire energy. For this core energy, the most economical transportation method is pipeline transportation. From the initial development of industrial pipelines to the present, the construction of oil and gas pipelines has experienced more than two centuries of development. The early transmission pipelines were relatively close to the central city, and the geographical environment and social support conditions were superior. Most of the newly discovered oil fields are in remote areas, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C33/04C21D8/02
CPCC22C38/58C22C38/50C22C38/48C22C38/44C22C38/02C22C33/04C21D8/0226C21D8/0247
Inventor 石艾来许晓红白云苗丕峰孙宪进许峰
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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