Economic-type pipe fitting steel with high strength and low yield ratio and production method thereof

A low-yield ratio, high-strength technology, applied in the field of economical high-strength low-yield ratio pipe fitting steel for oil and gas transportation and its production field, can solve problems such as unguaranteed performance and shortage, achieve high toughness weldability, increase Nucleation site, effect of improving surface quality

Active Publication Date: 2013-02-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent CN101864535A provides a large-deformation-resistant pipeline steel. The steel plate only guarantees the performance of the hot-rolled state, and cannot guarantee the performance after hot forming.
[0006] To sum up, the research on economical high-strength and low-yield-ratio pipe fitting steels in the prior art is still insufficient.

Method used

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  • Economic-type pipe fitting steel with high strength and low yield ratio and production method thereof
  • Economic-type pipe fitting steel with high strength and low yield ratio and production method thereof
  • Economic-type pipe fitting steel with high strength and low yield ratio and production method thereof

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing:

[0026] The chemical composition of the embodiments of the present invention is shown in Table 1; the rolling process of the corresponding embodiments is shown in Table 2; the quenching and tempering heat treatment process is shown in Table 3; the performance after quenching and tempering heat treatment is shown in Table 4.

[0027] Table 1 The chemical composition wt% of the economical high-strength low-yield-ratio pipe fitting steel of the present invention

[0028]

[0029] Table 2 The rolling process of the economical high-strength low-yield-ratio pipe fitting steel of the embodiment of the present invention

[0030]

[0031] Table 3 Quenching and tempering process of economical high-strength and low-yield-ratio pipe fitting steel in the embodiment of the present invention

[0032]

[0033] Table 4 Properties of economical high-strength and low-yield-ratio pipe...

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Abstract

The invention discloses an economic-type pipe fitting steel with high strength and low yield ratio, which comprises the following elements: 0.10%-0.18% of C, 0.25%-0.55% of Si, 1.40%-1.90% of Mn, 0.02%-0.05% of Nb, 0.008%-0.020% of Ti, 0.02%-0.05% of V, 0.010%-0.040% of Als, smaller than or equal to 0.10% of Nb, V and Ti, 0-0.25% of Mo, 0-0.30% of Ni, 0-0.35% of Cu, 0-0.30% of Cr, smaller than or equal to 0.55% of Mo, Ni, Cu and Cr, and the balance of ferrum and unavoidable impurities. The yield strength after heat treatment can reach more than 630MPa or 690MPa, the tensile strength reaches more than 775MPa or 870MPa, the yield ratio is lower than 0.85, the impact ductility at minus 46 DEG C is not lower than 80J, and the technical requirements for X90 level and X100 level pipe fitting steel are completely satisfied.

Description

technical field [0001] The invention belongs to the technical field of low-carbon micro-alloy steel, and in particular relates to an economical high-strength and low-yield ratio pipe fitting steel for oil and gas transportation and a production method thereof. Background technique [0002] Pipe fittings are important structural parts in pipelines that change direction, reinforce and strengthen, mainly including tees, bends and heads, etc. A large number of pipe fittings are required in the construction of long-distance pipelines. With the development of pipeline transportation towards high pressure and large diameter, the requirements for the strength, toughness and weldability of pipe fittings have been continuously improved, and higher requirements have been put forward for the comprehensive quality of steel for pipe fittings. [0003] At present, the production of oil and gas pipe fittings generally needs to undergo heat treatment and forming. Therefore, it is required th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/16C22C38/28C22C38/38C22C38/58C22C38/50
Inventor 张帅任毅王爽刘文月高红
Owner ANGANG STEEL CO LTD
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