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High-performance on-line quenching high-strength steel pipe and production method thereof

A production method and high-performance technology, applied in the direction of improving process efficiency, etc., can solve the problems of high energy consumption in heat treatment, poor structure and performance of online quenched steel pipes, etc., and achieve the effects of improving overall performance, saving energy consumption, and simple and easy process

Active Publication Date: 2021-06-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of high energy consumption of off-line heat treatment or poor structure and performance of on-line quenched steel pipes commonly used in the production of hot-rolled steel pipes, and realizes high-performance, low-cost and high-efficiency production of high-strength hot-rolled seamless steel pipes

Method used

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  • High-performance on-line quenching high-strength steel pipe and production method thereof
  • High-performance on-line quenching high-strength steel pipe and production method thereof

Examples

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Effect test

Embodiment 1

[0047] A production method for high-performance online quenching high-strength steel pipes, comprising the following process steps:

[0048] Step 1: Smelting

[0049] Use an electric furnace to smelt scrap steel into molten steel. When the temperature of molten steel reaches 1600-1700°C and the mass fraction of carbon in the molten steel is 0.03-0.15%, the mass fraction of phosphorus is 0.001-0.015%, and the mass fraction of sulfur is 0.005-0.025%, the steel is tapped. During the tapping process, pre-deoxidize to molten steel dissolved oxygen 2 o 3 Oxides; according to the composition requirements of high-performance online quenching and high-strength steel pipes, the element content of molten steel is adjusted, and the molten steel is continuously cast by a round billet continuous casting machine to obtain a round billet;

[0050] Step 2: Rolling the Tube

[0051] Heat the round tube blank to 1200°C for 260 minutes to obtain the heated tube blank;

[0052] Cross-rolling an...

Embodiment 2

[0063] A production method for high-performance online quenching high-strength steel pipes, comprising the following process steps:

[0064] Step 1: Smelting

[0065] The molten iron is smelted into molten steel by using a converter. When the molten steel reaches 1600-1700°C, the mass fraction of carbon in the molten steel is 0.03-0.15%, the mass fraction of phosphorus is 0.001-0.015%, and the mass fraction of sulfur is 0.005-0.025%. For steel, add silicon as a deoxidizer in the tapping process to pre-deoxidize until the dissolved oxygen in molten steel is less than 50ppm; carry out LF refining to control the dissolved oxygen in molten steel to be less than 20ppm and the nitrogen content to be less than 80ppm; feed titanium-based cored wire into molten steel, and titanium-based cored wire The wire is made of alloy powder with a particle size of less than 3mm wrapped in a steel belt. The chemical composition of the alloy powder includes: Ti: 18%, Ca: 20%, Mg: 30%, N: 0.1%, O: 8...

Embodiment 3

[0076] A production method for high-performance online quenching high-strength steel pipes, comprising the following process steps:

[0077] Step 1: Smelting

[0078] Use a converter to smelt molten iron and scrap steel (according to the mass ratio, molten iron:scrap = 4:1) into molten steel. 0.015% and sulfur mass fraction of 0.005-0.025% after tapping the steel, adding a deoxidizer during the tapping process to pre-deoxidize until the dissolved oxygen in molten steel is less than 50ppm; the molten steel after pre-deoxidation is subjected to LF refining and RH refining to heat up, make Refining treatment of slag, bottom blowing, deoxidation and desulfurization, and inclusion removal, the refining time is 40 minutes; the dissolved oxygen in molten steel is controlled to be 2 o 3 Oxides; according to the composition requirements of high-performance online quenching and high-strength steel pipes, the element content of molten steel is adjusted, and the molten steel is continuou...

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Abstract

The invention discloses a high-performance on-line quenching high-strength steel pipe and a production method thereof, and belongs to the field of high-strength steel pipe production. The high-performance on-line quenching high-strength steel pipe is prepared from the following chemical components in percentage by mass: 0.1-0.3% of C, 0.1-0.8% of Si, 0.4-2.0% of Mn, 0.001-0.015% of P, 0.001-0.015% of S, 0.001-0.05% of Al, 0.005-0.05% of Ti, 0.001-0.01% of O, 0.003-0.012% of N, 0.0005-0.005% of B, 0.001-0.01% of Ca and Mg, 0.002-0.012% of B, Ca and Mg, and the balance of Fe and inevitable impurities. The high-performance on-line quenching high-strength steel pipe gets rid of a conventional off-line heat treatment means; the effective effect of inclusions in smelted steel is fully utilized; a martensite and / or bainite structure is obtained in cooperation with an on-line quenching process; the performance is improved; meanwhile, the production efficiency is improved; and low-cost green production of the high-strength steel pipe is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel pipe production, and in particular relates to a high-performance online quenching high-strength steel pipe and a production method thereof. Background technique [0002] Steel pipe is an important steel product in the development of industrial society and national economic construction, and has important applications in engineering fields such as energy, chemical industry, and machinery. Under the premise of meeting the high-strength performance requirements of steel pipes, how to further reduce costs and improve production efficiency has always been the goal in the field of steel pipe production. Because the cross-section of the steel pipe is a special-shaped cross-section, it is easy to produce uneven banded structure and large-sized abnormal structure after rolling under high-temperature deformation state, resulting in performance deterioration and failing to meet the expected requi...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/04C22C38/02C22C33/04C21C7/00C21D1/18C21D8/10
CPCC22C38/14C22C38/04C22C38/02C22C38/001C22C33/04C21C7/0056C21D1/18C21D8/105C21D2211/008C21D2211/002Y02P10/20
Inventor 袁国王超康健李振垒张元祥王洋方烽王国栋
Owner NORTHEASTERN UNIV
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