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
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  • 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

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  • 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
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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...

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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

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Application Information

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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
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