Tempered high-low-temperature toughness pipeline steel and manufacturing method

A low-temperature toughness and manufacturing method technology, applied in the direction of improving process efficiency, etc., can solve the problems that do not involve a series of key process low-temperature key toughness performance indicators, and it is difficult to guarantee the low-temperature toughness performance of steel plates, so as to achieve improved shape, high pass rate, Effect of improving low temperature toughness

Inactive Publication Date: 2016-08-03
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It only involves the smelting process of pipeline steel clean steel, focusing on ensuring the hydrogen sulfide resistance of quenched and tempered pipeline steel, without comprehensive consideration of the low temperature toughness and process of pipeline steel, it is difficult to guarantee the low temperature toughness of steel plate; 3), 4 ), 5) It involves the rolling and heat treatment proc

Method used

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  • Tempered high-low-temperature toughness pipeline steel and manufacturing method
  • Tempered high-low-temperature toughness pipeline steel and manufacturing method
  • Tempered high-low-temperature toughness pipeline steel and manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A quenched and tempered pipeline steel plate in this embodiment is prepared from the following components in mass percentage: C: 0.08%, Si: 0.25%, Mn: 1.60%, P=0.004%, S=0.001%, Nb: 0.015%, Ti: 0.010%, Mo: 0.10%, Alt: 0.015%, Ce: 0.010%, V: 0.030%. Residual elements: Cu=0.001%, Ni=0.050%, C=0.001%, B=0.0001%, and the rest contains Fe. The chemical composition of the steel satisfies: Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B=0.18%, Nb+V+Ti=0.055%.

[0042] A quenched and tempered pipeline steel plate in this embodiment and its manufacturing method are as follows:

[0043] 1) Smelting and continuous casting process: In the above-mentioned KR process, P=0.080% of the molten iron into the furnace, S=0.001% after desulfurization treatment of the molten iron; 120t converter smelting oxygen lance position time 1min, steel tapping time 4.5min, converter The end point temperature is controlled at 1640°C; VD / RH is added to the fine-tuning alloy according to the target compo...

Embodiment 2

[0053]A quenched and tempered pipeline steel plate in this embodiment is prepared from the following components by mass percentage: C: 0.11%, Si: 0.45%, Mn: 1.80%, P=0.006%, S=0.003%, Nb: 0.035%, Ti: 0.030%, Mo: 0.30%, Alt: 0.045%, Ce: 0.030%, V: 0.050%. Residual elements: Cu=0.001%, Ni=0.010%, Cr=0.001%, B=.0002%, and the rest contains Fe. The chemical composition of the steel satisfies: Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B=0.24%, Nb+V+Ti=0.115%.

[0054] A quenched and tempered pipeline steel plate in this embodiment and its manufacturing method are as follows:

[0055] 1) Smelting and continuous casting process: In the above-mentioned KR process, P=0.120% of molten iron in furnace, S=0.003% after desulfurization treatment of molten iron; 120t converter smelting time of oxygen lance position is 2min, tapping time is 6min, the end of converter The temperature is controlled at 1650°C, VD / RH is added to the fine-tuning alloy according to the target composition, VD / RH...

Embodiment 3

[0065] A quenched and tempered pipeline steel plate in this embodiment is prepared from the following components by mass percentage: C: 0.090%, Si: 0.35%, Mn: 1.70%, P=0.004%, S=0.0015%, Nb: 0.022%, Ti: 0.021%, Mo: 0.14%, Alt: 0.035%, Ce: 0.018%, V: 0.032%. Residual elements: Cu=0.001%, Ni=0.030%, C=0.002%, B=.0001%, the rest contains Fe. The chemical composition of the steel satisfies: Pcm=C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B=0.20%, Nb+V+Ti=0.075%.

[0066] A quenched and tempered pipeline steel plate in this embodiment and its manufacturing method are as follows:

[0067] 1) Smelting and continuous casting process: In the above-mentioned KR process, P=0.090% of the molten iron into the furnace, S=0.002% after desulfurization treatment of the molten iron; the oxygen lance position time is 1.5min during 120t converter smelting, and the tapping time is 5min. The end point temperature is controlled at 1645°C, VD / RH is added to the fine-tuning alloy according to the target...

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Abstract

The invention belongs to the field of metal material rolling, and relates to tempered high-low-temperature toughness pipeline steel and a manufacturing method. The steel is characterized by comprising chemical components including, by weight, 0.08-0.11% of C, 0.25-0.45% of Si, 1.60-1.80% of Mn, smaller than or equal to 0.006% of P, smaller than or equal to 0.003% of S, 0.015-0.035% of Nb, 0.010-0.030% of Ti, 0.10-0.30% of Mo, 0.015-0.045% of Alt, 0.010-0.030% of Ce and 0.030-0.050% of V, residual components including, by weight, smaller than or equal to 0.50% of Cu, smaller than or equal to 0.50% of Ni, smaller than or equal to 0.50% of Cr and smaller than or equal to 0.0005% of B, and the balance Fe. The chemical components of the steel meet the equation Pcm=C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5, B is smaller than or equal to 0.24%, and the sum of Nb, V and Ti is smaller than or equal to 0.15%. The finally-obtained produced tempered pipeline steel is fine in texture and excellent in low-temperature performance index charpy impact and drop-weight tear test performance.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength pipeline steel manufacturing, and relates to a quenched and tempered high-low temperature ductile pipeline steel and a manufacturing method. Through technological innovation and optimization, a quenched and tempered pipeline steel plate with excellent low-temperature toughness performance is produced. The performance of the pipeline steel plate produced by the invention is stable, in particular, it has excellent low-temperature drop weight performance and Charpy impact performance. Background technique [0002] With the development of China's economy and the development of the national petroleum industry, especially the large-scale successful application of X80 pipeline steel in the second West-East Gas Pipeline, it marks that the development of my country's petroleum pipelines has reached the international advanced level. The world's increasing demand for energy has led to the ext...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/02C22C38/04C22C38/12C22C38/06C22C38/16C22C38/08C22C38/32C21D8/02
CPCC21D8/0247C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/32Y02P10/20
Inventor 牛延龙刘晓东刘志刚韩启彪于爽赵慧杰宋志超李柏君于彦飞高伟
Owner SHANDONG IRON & STEEL CO LTD
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