Production method for improving surface quality of thin-gauge pipeline steel

A technology of surface quality and production method, applied in the production field of improving the surface quality of thin-gauge pipeline steel, can solve the problems of uneven damage of iron oxide scale, large surface deformation of steel plate, large rolling deformation, etc. The effect of surface quality improvement

Inactive Publication Date: 2019-07-30
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increasing demand for energy in the world, oil pipeline transportation is more and more 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 damaged. Rainwater or even seawater erosion, the surface quality of the steel plate will deteriorate after arriving at the station, and some may affect the use
At present, pipeline steel adopts TMCP rolling process. In order to improve product p

Method used

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  • Production method for improving surface quality of thin-gauge pipeline steel
  • Production method for improving surface quality of thin-gauge pipeline steel

Examples

Experimental program
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Example Embodiment

[0065] Example 1

[0066] This embodiment provides a production method for improving the surface quality of thin-gauge pipeline steel, the steel grade is 5LB, the blank is 150mm*2560mm in section, and the product specification is 11.1mm*3304mm;

[0067] S1. Its chemical composition and mass percentage are as follows: C: 0.050%~0.080%, Si: 0.20%~0.30%, Mn: 1.20%~1.50%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Cr ≤0.30%, Cu≤0.20%, Nb≤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;

[0068] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned, and the molten iron into the furnace S: 0.0020%, after the converter, S: 0.008%;

[0069] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting, the converter tapping temperature is 1660℃, and the tapping uses pre-melted refining slag + ac...

Example Embodiment

[0076] Example 2

[0077] This embodiment provides a production method for improving the surface quality of thin-gauge pipeline steel. The steel grade is X65M, the blank is 150mm*2580mm in section, and the product specification is 9.5mm*2360mm;

[0078] S1, its chemical composition and mass percentage are as follows: C: 0.040%~0.060%, Si: 0.10%~0.30%, Mn: 1.30%~1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Cr ≤0.20%, Cu≤0.20%, Nb: 0.030%~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;

[0079] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned, and the molten iron into the furnace S: 0.0020%, after the converter, S: 0.006%;

[0080] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting, the converter tapping temperature is 1645℃, and the tapping uses pre-melted refining sl...

Example Embodiment

[0087] Example 3

[0088] This embodiment provides a production method for improving the surface quality of thin-gauge pipeline steel, the steel grade is X70M, the blank is 150mm*2460mm section blank, and the product specification is 6.4mm*3110mm;

[0089] S1. Its chemical composition and mass percentage are as follows: C: 0.050%~0.070%, Si: 0.15%~0.25%, Mn: 1.50%~1.80%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Cr :0.10%~0.30%, Cu≤0.20%, Nb: 0.040%~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;

[0090] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned, and the molten iron into the furnace S: 0.0020%, after the converter, S: 0.008%;

[0091] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting, the tapping temperature of the converter is 1659℃, and the tapping uses pre-m...

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Abstract

The invention discloses a production method for improving the surface quality of thin-gauge pipeline steel. Chemical components comprise, by mass percent, 0.040%-0.080% of C, 0.10%-0.30% of Si, 1.20%-1.90% of Mn, not larger than 0.015% of P, not larger than 0.0030% of S, not larger than 0.30% of Ni, not larger than 0.30% of Cr, not larger than 0.20% of Cu, not larger than 0.070% of Nb, not largerthan 0.15% of Mo, not larger than 0.01% of V, 0.005%-0.02% of Ti, not larger than 0.0050% of N, 0.001%-0.003% of Ca, 0.010%-0.050% of Al and the balance Fe and inevitable impurities. Through the smelting process, the surface quality of a cast blank is optimized and improved, the rolling forming technology is adjusted, the integrity of scale on the surface of a steel plate is improved, a corrosion-resisting pipeline steel plate with high surface quality is obtained, 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 thin-gauge 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, and some 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...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C21C7/10
CPCC21C7/10C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 翟冬雨吴俊平方磊姜金星洪君靳星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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