Efficient pipeline steel L245N production process

A production process and pipeline steel technology, which is applied in the field of high-efficiency pipeline steel L245N production process, can solve the problems of low yield and poor pass rate of pipeline steel, and achieve the effects of improving performance pass rate, increasing strength, and refining grains

Inactive Publication Date: 2021-11-16
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Actively improve the pipeline steel L245 process from various aspects. In order to solve the problems of low yield and poor pass rate of pipeline steel, we make the following adjustments for the production process of pipeline steel L245:

Method used

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  • Efficient pipeline steel L245N production process
  • Efficient pipeline steel L245N production process
  • Efficient pipeline steel L245N production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The production process of L245N grade pipeline steel plate, the composition and mass percentage of steel are: C=0.12, Si=0.16, Mn=1.10, P=0.017, S=0.002, Al=0.032, Nb=0.015, Ti=0.010, Ce = 0.0003.

[0035] The main process steps and parameters are as follows:

[0036] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loading amount, the end point C, and th...

Embodiment 2

[0046] The production process of L245N pipeline steel plate, the composition and mass percentage of steel are: C=0.11, Si=0.15, Mn=1.15, P=0.012, S=0.002, Al=0.026, Nb=0.016, Ti=0.012, Ce = 0.0003.

[0047] The main process steps and parameters are as follows:

[0048] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap steel about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loading amount, the end point C, and th...

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Abstract

The invention discloses an efficient pipeline steel L245N production process. The component design of the method is more economical and applicable; the rolling method adopts a production mode of normalizing rolling; through high-temperature rolling, a rolled steel plate is at a temperature above the critical temperature Ac3; through a production mode simulating a normalizing heat treatment state, the effects of refining grains and homogenizing the structure are achieved; and by reducing the ferrite content in the hypoeutectoid steel, the pearlite content is increased and refined, so that the strength, hardness and toughness of the steel are improved. The process does not adopt a water cooling process, so that the defect of large head and tail temperature difference caused by the water cooling process is avoided, and the yield is improved while the performance qualification rate is improved. By adding rare earth elements, the grain boundary is improved, and the low-temperature impact toughness of the steel plate is improved.

Description

technical field [0001] The invention relates to the field of normalizing rolling medium and thick plates, in particular to a high-efficiency pipeline steel L245N production process. Background technique [0002] In recent years, with the gradual implementation of my country's western development strategy, the adjustment of energy structure and the gradual strengthening of environmental protection, my country's natural gas industry will have a greater development in this century. The plan to form a national large oil and gas pipeline network and the Asian Oil Continental Bridge is being stepped up. The country has included the "West-to-East Gas Pipeline" as a national key infrastructure project. In the next few years, the construction of long-distance natural gas pipelines will reach its peak. Expect. [0003] Pipeline transportation is the most economical and reasonable way to transport oil and natural gas over long distances. As the demand for oil and natural gas increases, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02C22C33/06
CPCC22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C22C38/005C21D8/0226C22C33/06Y02P10/20
Inventor 隋鑫张军陆斌柳婕张帅谷鑫孙长玉
Owner BAOTOU IRON & STEEL GRP
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