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

High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe

A hydrogen-induced cracking resistance and high-strength technology, applied in the field of hydrogen-induced cracking resistance (hydrogen-induced crack resistance), can solve the problems of easy crack expansion and other problems, and achieve the effects of significant contribution, rise suppression, and segregation reduction

Inactive Publication Date: 2016-08-10
NIPPON STEEL CORP
View PDF10 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the central segregation part of the steel, the periphery of the inclusions, etc. are hardened, cracks are easy to propagate

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 and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe
  • High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe
  • High-strength steel sheet and high-strength steel pipe having excellent hydrogen-induced cracking resistance for use in line pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0168] Next, the present invention will be described in more detail by way of examples.

[0169] Steels having the chemical compositions shown in Table 1 were melted and continuously cast to produce billets with a thickness of 240 mm. In addition, Table 1 also shows the analysis value of the hydrogen content of molten steel. In continuous casting, light reduction at the time of final solidification is performed. The obtained slab is heated to 1000-1250°C, hot-rolled in a recrystallization temperature range exceeding 900°C, and then hot-rolled in a non-recrystallization temperature range of 750-900°C. After hot rolling, water cooling was started at 750° C. or higher, and water cooling was stopped at a temperature of 400 to 500° C., and steel sheets with various thicknesses shown in Table 2 were produced.

[0170] Furthermore, the steel plate is formed into a tube by C stamping, U stamping, and O stamping, the end faces are tack welded, the inner and outer surfaces are fully w...

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
lengthaaaaaaaaaa
hardnessaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

Provided are a steel sheet and a steel pipe having excellent HIC resistance that are ideal for, for instance, a line pipe used to convey petroleum or natural gas. The steel sheet and the steel pipe are formed from steel having a steel composition that comprises C: 0.02-0.08%, Si: 0.01-0.5%, Mn: 1.0-1.6%, Nb: 0.001-0.10%, Ca: 0.0001-0.0050%, N: 0.0010-0.0050%, and O: 0.0001-0.0030%, P: 0.01% or less, S: 0.0020% or less, Al: 0.030% or less, and Ti: 0.030% or less and that satisfies S / Ca<0.5, and having an unpressed portion of the part where center segregation occurs that is 0.1 mm or less in length.

Description

[0001] The application number is 201080007523.9, the title of the invention is "High-strength line pipe steel plate and high-strength line pipe steel pipe with excellent resistance to hydrogen-induced cracking", the application date is February 12, 2010, and the date of entering the Chinese national phase is 2011 The divisional application of the invention patent application on August 12, 2009. technical field [0002] The present invention relates to steel sheets for line pipes and steel pipes for line pipes that are excellent in hydrogen-induced cracking resistance (resistance to hydrogen-induced cracking; referred to as HIC resistance) and are most suitable for applications such as line pipes for transportation of petroleum and natural gas. Background technique [0003] Contains more hydrogen sulfide (H 2 S) In pipelines for oil, natural gas, etc., there is concern about the generation of hydrogen-induced cracks (called HIC). The reason is that in the H containing moistu...

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): C22C38/04C22C38/02C22C38/12C22C38/08C22C38/16C22C38/32C22C38/14
CPCC22C38/04C22C38/002C22C38/005C22C38/02C22C38/08C22C38/12C22C38/14C22C38/16C22C38/32
Inventor 原卓也寺田好男村木太郎铃木豪
Owner NIPPON 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