High-intensity pipe steel and production method thereof

A production method and technology for pipe fitting steel, which are applied in the direction of temperature control, etc., can solve the problems such as the lack of research on X100 grade pipe fitting steel and the lack of research on high-grade pipe fitting steel.

Active Publication Date: 2011-03-30
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the research on high-grade pipe fitting steel is insufficient, and the research on X100 grade pipe fitting steel is still blank

Method used

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  • High-intensity pipe steel and production method thereof
  • High-intensity pipe steel and production method thereof
  • High-intensity pipe steel and production method thereof

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Embodiment Construction

[0022] The specific embodiment of the present invention is described further below:

[0023] The present invention enumerates 5 embodiments, and the embodiment chemical composition of 5 high-strength pipe fitting steels is shown in Table 1;

[0024] The rolling process of corresponding embodiment is shown in Table 2;

[0025] Corresponding embodiment quenching and tempering process is shown in Table 3;

[0026] The properties of corresponding examples after quenching and tempering heat treatment are shown in Table 4.

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

[0028] Example

C

Si

mn

P

S

Ni

Ti

Nb

V

Cu

Cr

Mo

als

Ceq

1

0.15

0.30

1.81

0.010

0.002

-

0.021

0.09

-

0.36

-

-

0.027

0.48

2

0.10

0.32

...

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PUM

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Abstract

The invention discloses a high-intensity pipe steel and a production method thereof. The pipe steel comprises the following chemical compositions in percentage by weight: 0.07 to 0.15 percent of C, 0.15 to 0.35 percent of Si, 1.55 to 1.85 percent of Mn, 0.04 to 0.10 percent of Nb, 0.01 to 0.025 percent of Ti, 0.10 to 0.40 percent of Cu, 0.01 to 0.045 percent of Als, 0 to 0.35 percent of Ni, 0 to 0.05 percent of V, 0 to 0.35 percent of Cr, 0 to 0.30 percent of Mo and the balance of iron and inevitable impurities. The yield strength of the pipe steel is more than or equal to 690 MPa, the tensile strength is more than or equal to 760 MPa, and the impact toughness at the temperature of 30 DEG C below zero is more than or equal to 90 J; and the pipe steel fully meets the technical requirements of X100 level pipe steel and can be taken as a raw material which is suitable for manufacturing an oil gas conveying X100 pipe.

Description

technical field [0001] The invention relates to the technical field of low-carbon micro-alloy steel, in particular to a high-strength pipe fitting steel and a production method thereof. Background technique [0002] Pipe fitting steel is the raw material for tees and elbows used in the manufacture of long-distance oil and gas pipelines. The importance of tees and elbows in pipelines is no less than that of pipeline steel pipes on the line, and their safety hazards may be more serious than pipelines. Steel pipes have attracted great attention from long-distance pipeline builders, and put forward higher requirements for the comprehensive quality of pipe fitting steel. [0003] At present, domestic production and research on high-grade pipe fittings are less, and research and reports on X100 pipe fittings are even rarer. Although there is some research on pipeline steel of X100 and above grade at home and abroad, due to the significant difference in the manufacturing process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/38C22C38/16C21D8/10C21D1/25B21B37/74
Inventor 张帅任毅王爽刘文月张禄林黄松陈军平
Owner ANGANG STEEL CO LTD
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