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Production method for improving surface quality of high-grade pipeline steel

A technology of surface quality and production method, which is applied in the production field of improving the surface quality of high-grade pipeline steel. It can solve the problems of large deformation of the steel plate surface, affecting the use, corrosion of the steel plate, etc., and achieve the effect of improving the surface quality.

Inactive Publication Date: 2019-08-23
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the world's demand for energy increases, oil pipeline transportation is increasingly sought after by countries all over the world. The steel plates demanded in foreign markets are mainly transported by cruise ships, and the transportation cycle is generally 1 to 2 months. The ocean environment is harsh, and steel plates are often subjected to Rainwater or even seawater erosion, the surface quality of the steel plate will deteriorate after arriving at the station, which may affect the use
At present, pipeline steel adopts TMCP rolling process. In order to improve product performance, low-temperature rolling technology is widely used. The large amount of rolling deformation leads to large surface deformation of the steel plate, and the oxide scale is often damaged on the steel plate. The structure changes during the cooling process. Fast, uneven internal stress, resulting in uneven stress on the surface of the steel plate, the oxide scale obtained on the surface of the steel plate after warm straightening is incomplete, and the place where the oxide scale falls off is prone to rust sources, resulting in deterioration of the surface quality of the steel plate

Method used

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  • Production method for improving surface quality of high-grade pipeline steel
  • Production method for improving surface quality of high-grade pipeline steel

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Effect test

Embodiment 1

[0056] This embodiment provides a production method for improving the surface quality of high-grade pipeline steel. The steel grade is X70M grade, and the blank is 260mm*2570mm section blank, and the product specification is 22mm*4830mm. Specifically:

[0057] S1, its chemical composition and mass percentage are as follows: C: 0.040%~0.070%, Si: 0.20%~0.30%, Mn: 1.60%~1.80%, P≤0.014%, S≤0.0030%, Ni: 0.10%~0.20 %, Cr: 0.20%~0.30%, Cu≤0.03%, Nb: 0.040%~0.060%, Mo≤0.005%, V≤0.003%, Ti: 0.005%~0.02%, N≤0.0050%, Ca: 0.001% ~0.003%, Al: 0.010%~0.050%, the balance is Fe and unavoidable impurities;

[0058] S2. The desulfurization station uses lime and magnesium powder for compound desulfurization. After desulfurization, the slag is cleaned. S: 0.0020% in the molten iron, and S: 0.008% after the converter;

[0059] S3. Steelmaking adopts the process route of BOF → LF furnace refining → RH refining → continuous casting. The tapping temperature of the converter is 1668°C, and the tapp...

Embodiment 2

[0067] This embodiment provides a production method for improving the surface quality of high-grade pipeline steel. The steel grade is X90M grade, and the blank is 220mm*1900mm section blank, and the product specification is 16mm*2830mm. Specifically:

[0068] S1, its chemical composition and mass percentage are as follows: C: 0.050%~0.080%, Si: 0.10%~0.20%, Mn: 1.50%~1.70%, P≤0.015%, S≤0.0030%, Ni: 0.10%~0.30 %, Cr: 0.10%~0.20%, Cu≤0.20%, Nb: 0.050%~0.070%, Mo≤0.15%, V≤0.01%, Ti: 0.005%~0.02%, N≤0.0050%, Ca: 0.001% ~0.003%, Al: 0.010%~0.050%, the balance is Fe and unavoidable impurities;

[0069] S2. The desulfurization station uses lime and magnesium powder for compound desulfurization. After desulfurization, the slag is cleaned. S: 0.0020% in the molten iron, and S: 0.009% after the converter;

[0070] S3. Steelmaking adopts the process route of BOF → LF furnace refining → RH refining → continuous casting. The tapping temperature of the converter is 1648°C, and the tappin...

Embodiment 3

[0078] This embodiment provides a production method for improving the surface quality of high-grade pipeline steel. The steel grade is X80M grade, and the blank is 320mm*2700mm section blank, and the product specification is 30mm*4310mm. Specifically:

[0079]S1, its chemical composition and mass percentage are as follows: C: 0.040%~0.070%, Si: 0.10%~0.30%, Mn: 1.60%~1.90%, P≤0.015%, S≤0.0030%, Ni: 0.15%~0.30 %, Cr: 0.10%~0.20%, Cu≤0.20%, Nb: 0.040%~0.060%, Mo≤0.15%, V≤0.01%, Ti: 0.005%~0.02%, N≤0.0050%, Ca: 0.001% ~0.003%, Al: 0.010%~0.050%, the balance is Fe and unavoidable impurities;

[0080] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned. S: 0.0020% in the molten iron, and S: 0.006% after the converter;

[0081] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting. The tapping temperature of the converter is 1679°C, and the tapping adop...

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Abstract

The invention discloses a production method for improving the surface quality of high-grade pipeline steel. The steel comprises the following chemical components in percentage by mass: 0.040-0.080% ofC, 0.10-0.30% of Si, 1.50-1.90% of Mn, P not more than 0.015%, S not more than 0.0030%, 0.10-0.30% of Ni, 0.10-0.30% of Cr, Cu not more than 0.20%, 0.040-0.070% of Nb, Mo not more than 0.15%, V not more than 0.01%, 0.005-0.02% of Ti, N not more than 0.0050%, 0.001-0.003% of Ca, 0.010-0.050% of Al, and the balance of Fe and inevitable impurities. Through optimization of a smelting process, the blank surface quality is improved; and through adjustment of a rolling forming technology, the steel plate surface scale completeness is improved, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a production method for improving the surface quality of high-grade pipeline steel. Background technique [0002] As the world's demand for energy increases, oil pipeline transportation is increasingly sought after by countries all over the world. The steel plates demanded in foreign markets are mainly transported by cruise ships, and the transportation cycle is generally 1 to 2 months. The ocean environment is harsh, and steel plates are often subjected to Rainwater or even seawater erosion, the surface quality of the steel plate will deteriorate after arriving at the station, which may affect the use. At present, pipeline steel adopts TMCP rolling process. In order to improve product performance, low-temperature rolling technology is widely used. The large amount of rolling deformation leads to large deformation of the steel plate surface, and the oxide scale is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/46C22C38/50C22C38/58B21C37/02B22D11/04B22D11/16C21C7/064C21C7/072C21C7/10C22C33/04
CPCB21C37/02B22D11/0406B22D11/16C21C7/064C21C7/072C21C7/10C22C33/04C22C38/002C22C38/02C22C38/06C22C38/42C22C38/46C22C38/50C22C38/58
Inventor 翟冬雨吴俊平方磊姜金星洪君靳星刘呈军杜海军员强鹏殷杰冯巍赵显鹏王凡黄灿
Owner NANJING IRON & STEEL CO LTD
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