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

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...

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 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

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