Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe

A technology of high-strength steel plate and manufacturing method, which is applied in the field of high-strength steel plate for acid-resistant line pipe and its manufacture and high-strength steel pipe using high-strength steel plate for acid-resistant line pipe, which can solve the problems of uneven scale thickness, deviation of steel plate material, Problems such as cooling speed deviation

Active Publication Date: 2021-05-04
JFE STEEL CORP
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, when the thickness of the scale on the surface of the steel plate is uneven, the cooling rate of the steel plate below it also varies during cooling, and the variation of the local cooling stop temperature in the steel plate becomes a problem.
As a result, variations in the steel sheet quality in the sheet width direction occur due to variations in scale thickness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe
  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe
  • High-strength steel sheet for sour-resistant line pipe, method for producing same, and high-strength steel pipe using high-strength steel sheet for sour-resistant line pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] The steels (steel grades A to M) having the composition shown in Table 1 were made into slabs by continuous casting, heated to the temperature shown in Table 2, and then rolled at the end temperature and reduction shown in Table 2. Hot-rolled at a certain rate to produce steel sheets with the thicknesses shown in Table 2. Then, under the conditions shown in Table 2, the steel plates were controlled and cooled using a water-cooled controlled cooling device. Then, the steel plate was reheated immediately using the online induction heating apparatus so that the average temperature of the steel plate became "reheating temperature" of Table 2.

[0120] [determination of organization]

[0121] The microstructure of the obtained steel sheet was observed with an optical microscope and a scanning electron microscope. Table 2 shows the structure at a position 0.25 mm below the surface of the steel plate and the structure at the center of the plate thickness.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
dislocation densityaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

Provided is a high-strength steel sheet for sour-resistant line pipe which has not only excellent HIC resistance but also excellent SSCC resistance in severely corrosive environments and excellent SSCC resistance in environments with a low hydrogen sulphide partial pressure of less than 1 bar. This high-strength steel sheet for sour-resistant line pipe is characterized by having a component composition containing predetermined quantities of C, Si, Mn, P, S, Al, Mo and Ca, further containing predetermined quantities of Nb and Ti, with the remainder being made up of Fe and unavoidable impurities, the steel microstructure at 0.25 mm below the surface of the steel sheet being a bainite microstructure having a dislocation density of 1.0*10<14> to 7.0*10<14> (m<-2>), the variation in Vickers hardness at 0.25 mm below the surface of the steel sheet not exceeding 30 HV at 3 standard deviations, and a tensile strength of at least 520 MPa.

Description

technical field [0001] The present invention designs an acid-resistant high-strength steel plate for line pipe with excellent material uniformity in steel plates suitable for line pipes in the fields of construction, marine structures, shipbuilding, civil engineering, and construction industrial machinery, and a manufacturing method thereof. In addition, the present invention relates to a high-strength steel pipe using the above-mentioned high-strength steel plate for acid-resistant linepipe. Background technique [0002] Generally, a line pipe is manufactured by forming a steel plate manufactured by a thick plate mill or a hot rolling mill into a steel pipe by UOE forming, press bending, roll forming, and the like. [0003] Among them, line pipes used in the transportation of crude oil and natural gas containing hydrogen sulfide require not only strength, toughness, weldability, etc., but also resistance to hydrogen-induced cracking (HIC (Hydrogen Induced Cracking) resistan...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC22C38/14C22C38/02C22C38/04C22C38/06C22C38/12C22C38/16C21D8/0226C21D8/0263C21D2211/002C22C38/001C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D6/005C21D6/008C22C38/20C21D9/46C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/58
Inventor 嶋村纯二横田智之上冈悟史石川信行
Owner JFE STEEL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com