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Economical aging-resistant high-strain precipitation strengthened pipeline steel and production method thereof

A precipitation strengthening and production method technology, applied in metal rolling, temperature control, etc., to reduce the impact of toughness, improve economic efficiency, and good economic efficiency

Active Publication Date: 2022-01-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To sum up, the current research on fine precipitation-strengthened economical aging-resistant high-strain pipeline steel is still insufficient

Method used

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  • Economical aging-resistant high-strain precipitation strengthened pipeline steel and production method thereof
  • Economical aging-resistant high-strain precipitation strengthened pipeline steel and production method thereof
  • Economical aging-resistant high-strain precipitation strengthened pipeline steel and production method thereof

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Embodiment Construction

[0045] Below by embodiment the present invention will be further described.

[0046] In the embodiment of the present invention, smelting, continuous casting, rolling and cooling are carried out according to the component distribution ratio of the technical solution.

[0047] Smelting: When tapping the converter, the tapping temperature is ≤1640°C, C≤0.045%, the slag is blocked and the steel is tapped, and lime and fluorite topping slag are added according to the ratio of 4 / 1 to 5 / 1 during the tapping process; RH vacuum treatment time during the refining process ≥10min;

[0048] Continuous casting: during the continuous casting process, the pouring superheat of the continuous casting slab is 10-30°C, and the casting speed of the continuous casting slab is 0.8-1.2m / min;

[0049] Heating: The continuous casting slab adopts multi-stage heating of preheating section, heating section I, heating section II, and soaking section. The temperature of the soaking section is 1170-1200°C,...

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Abstract

The invention provides economical aging-resistant high-strain precipitation strengthened pipeline steel and a production method thereof. The steel comprises the following components in percentages by weight: 0.045-0.070% of C, 0.26-0.45% of Si, 1.65-1.85% of Mn, less than or equal to 0.012% of P, less than or equal to 0.002% of S, 0.035-0.075% of Nb, 0.012-0.025% of Ti, 0.01-0.04% of V, 0.12-0.22% of Ni, 0.15-0.29% of Cu, greater than or equal to 0.7 of Ni / Cu, less than 0.30% of Cr, 0.010-0.025% of Al, 0.0010-0.0045% of N, and the balance of iron and inevitable impurities, wherein the CEPcm of the pipeline steel is controlled to be 0.165-0.190%, and CEPcm is equal to C+Si / 30+(Mn+Cu+Cr) / 20+Ni / 60+Mo / 15+V / 10+5B. After a steel plate is subjected to heat preservation for 1 hour at 250 DEG C, the longitudinal yield strength can reach 450-550 MPa, the longitudinal tensile strength can reach 650-730 MPa, the longitudinal uniform elongation UEL is greater than or equal to 9%, the longitudinal yield ratio does not exceed 0.75, and the longitudinal strain hardening index n is greater than or equal to 0.10.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to an economical aging-resistant high-strain precipitation-strengthened pipeline steel and a production method thereof. Background technique [0002] With the increasing demand for oil and gas resources and the reduction of land oil and gas resources, natural oil extraction continues to develop in complex and harsh environments. For example, cold areas, geologically complex and active areas, and oceans, etc. Among them, the large temperature difference between day and night in cold areas, the high frequency of crustal movement in geologically active areas, frequent ocean currents in the marine environment, high water pressure, and uneven seabed have great impact on oil and gas serving in complex and harsh environments. Steel pipes for mining and transportation put forward higher technical requirements. [0003] Pipeline steel plates used to make steel pipes serving in com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58B21B1/46B21B37/74C21D8/02
CPCC22C38/02C22C38/04C22C38/12C22C38/08C22C38/14C22C38/16C22C38/06C22C38/58C22C38/48C22C38/50C22C38/46C22C38/42C21D8/0205C21D8/0221B21B1/46B21B37/74C21D2211/002C21D2211/005
Inventor 张帅任毅孟劲松王爽高红付成哲
Owner ANGANG STEEL CO LTD
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