An economical HIC-resistant x90 pipeline steel plate and its manufacturing method

An economical, steel plate technology, applied in the economical anti-HICX90 pipeline steel plate and its manufacturing field, can solve the problems of X90 steel grade anti-HIC steel plate or steel pipe not being reported, achieve excellent anti-HIC performance, excellent low temperature toughness, reduce The effect of small erosion

Active Publication Date: 2018-02-23
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the cost of pipeline construction, the development direction of pipeline engineering is high-strength and large-diameter pipes. At present, the test section of X90 steel grade pipeline laying has begun at home and abroad, but X90 steel grade HIC-resistant steel plates or steel pipes have not yet been reported.

Method used

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  • An economical HIC-resistant x90 pipeline steel plate and its manufacturing method
  • An economical HIC-resistant x90 pipeline steel plate and its manufacturing method
  • An economical HIC-resistant x90 pipeline steel plate and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0030] The thickness of the HIC-resistant X90 pipeline steel plate in this embodiment is 20 mm, and its chemical composition is calculated by mass percentage: C: 0.06%, Mn: 1.70%, Si: 0.15%, S: 0.0005%, P: 0.01%, Nb : 0.055%, Ti: 0.018%, V: ≤ 0.05%, Al: 0.030%, Mo+Cu+Ni+Cr≤ 0.6%, N≤ 0.010%, O: ≤ 0.006%, Ca: 0.0008%, and the balance is Fe and unavoidable impurity elements.

[0031] First, the smelting raw materials are pretreated by KR molten iron, converter smelting, LF refining, and RH vacuum refining. During the refining process, the S content in molten steel is controlled to be ≤0.0005%, and then fed to the Ca-Si line to control the Ca / S content ratio in molten steel. 1.0 to 2.0, and then continuously cast continuous casting slabs that meet the chemical composition requirements and have a thickness of not less than 350mm. The continuous casting slab is reheated to 1280-1310°C, and the heat preservation is not less than 8 hours; two-stage rolling is carried out after being ...

Embodiment 2

[0034] The thickness of the HIC-resistant X90 pipeline steel plate of this embodiment is 19.6mm, and its chemical composition is calculated by mass percentage: C: 0.04%, Mn: 1.90%, Si: 0.28%, S: 0.0005%, P: 0.01%, Nb: 0.058%, Ti: 0.018%, V: ≤0.05%, Al: 0.030%, Mo+Cu+Ni+Cr≤ 0.9%, N≤ 0.010%, O: ≤ 0.006%, Ca: 0.0008%, balance It is Fe and inevitable impurity elements.

[0035] First, the smelting raw materials are pretreated by KR molten iron, converter smelting, LF refining, and RH vacuum refining. During the refining process, the S content in molten steel is controlled to be ≤0.0005%, and then fed to the Ca-Si line to control the Ca / S content ratio in molten steel. 1.0 to 2.0, and then continuously cast a continuous casting slab that meets the chemical composition requirements and has a thickness of 300mm. 1300°C, heat preservation for 8 hours; the total compression ratio is 15.3, and two-stage rolling is carried out after being released from the furnace: the first stage is ro...

Embodiment 3

[0038] The thickness of the HIC-resistant X90 pipeline steel plate in this embodiment is 20 mm, and its chemical composition is calculated by mass percentage: C: 0.02%, Mn: 1.85%, Si: 0.35%, S: 0.0005%, P: 0.01%, Nb : 0.058%, Ti: 0.018%, V: ≤ 0.05%, Al: 0.030%, Mo+Cu+Ni+Cr≤ 0.9%, N≤ 0.010%, O: ≤ 0.006%, Ca: 0.0008%, the balance is Fe and unavoidable impurity elements.

[0039] First, the smelting raw materials are pretreated by KR molten iron, converter smelting, LF refining, and RH vacuum refining. During the refining process, the S content in molten steel is controlled to be ≤0.0005%, and then fed to the Ca-Si line to control the Ca / S content ratio in molten steel. 1.0 to 2.0, and then continuously cast a continuous casting slab that meets the chemical composition requirements and has a thickness of 370mm. 1300°C, heat preservation for 8 hours; the total compression ratio is 18.5, and two-stage rolling is carried out after being released from the furnace: the first stage is...

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Abstract

Disclosed is an economical HIC-resistant X90 pipeline steel plate, the chemical components by mass percent of the steel plate are: C: 0.02%-0.06%, Mn: 1.7%-1.90%, Si: 0.15%-0.35%, S: ≤0.0005%, P: ≤0.010%, Nb: 0.04%-0.07%, Ti: 0.008%-0.03%, V: ≤0.10%, Al: ≤0.06%, N: ≤0.010%, O: ≤0.006%, Mo: ≤0.20%, Cu: ≤0.20%, Ni: ≤0.20%, Cr: ≤0.20%, Ca: 0.0005%-0.0015%, wherein the content ratio of Ca / S is 1.0-2.0, and the balance being Fe and inevitable impurity elements. According to the behaviour rule of hydrogen in the structure, the steel has a structure with an excellent HIC-resistant performance and excellent low-temperature toughness through an improved refining-continuous casting-high temperature reheating-TMCP process.

Description

technical field [0001] The invention belongs to the technical field of manufacturing steel plates for X90 pipelines, and in particular relates to economical HIC-resistant steel plates for X90 pipelines and a manufacturing method thereof. Background technique [0002] At present, fossil energy still occupies a dominant position in the energy structure in the energy demanded by the world. The rapid growth of the world economy in recent years has greatly driven the rapid growth of fossil energy demand. Resources such as land and alkaline oil and gas have been exploited for hundreds of years and are facing increasingly depleted. Therefore, humans have gradually turned their attention to sour oil and gas fields. The characteristic of sour oil and gas fields is that oil or natural gas contains a certain amount of H 2 S and other acidic gases cause corrosion to pipelines. The corrosion methods mainly include HIC (hydrogen-induced cracking) and SSCC (stress corrosion). Currently, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C38/16C22C38/08C22C38/18C22C33/04C21D8/02
CPCC22C38/12C22C38/14
Inventor 蒋昌林高助忠林涛胡建国李经涛诸建阳徐伟明徐国庆
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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