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

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...

AI Technical Summary

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 process of wear-resistant steel, container steel and rack steel, which are completely different from pipeline steel, and does not involve a series of key processes for obtaining high-low temperature ductile pipeline steel (such as Low temperature and constant temperature heat preservation treatment, etc.) and low temperature key toughness performance index, that is, the drop weight performance DWTT;

Images