On-line quenching production technique for high toughness thick steel plate

Abstract

A press quenching manufacturing technique process of high strength and ductility thick steel plate belongs to low alloying steel manufacturing technique field, which comprises heating up steel billet to 1100 DEG C to 1250 DEG C, rolling steel plate through two stages of austenite recrystallization zone and non recrystallization zone with 860 DEG C to 950 DEG C of final rolling temperature, realizing steel plate press quenching through adopting two cooling ways of aerial fog and water-curtain with 25-45 DEG C / s of average cooling speed in cooling region, stopping the quenching when temperaturereduced to 150 DEG C to 300 DEG C, and drawing the steel plate after quenched under high temperature. The invention overcomes the weaknesses of long productive cycle of current modified treatment method, high cost and unfavorable stability of high strength and ductility steel plate property which is manufactured by TMCP technique, and can manufacture 20mm-50mm high strength and high ductility steel plate with stable property. And the invention has the advantages of short production line and low energy consumption, which can be extensively applied to manufacture steel plate which is needed in the industries of metallurgy, petrifaction, hydroelectricity and marine and the like.

Description

technical field [0001] The invention belongs to the field of low-alloy steel production technology and relates to an online quenching manufacturing method for high-strength and tough thick steel plates. Background technique [0002] In recent years, with the intensification of the world's energy crisis, the metallurgical industry, as a large energy consumer, has a serious contradiction between capacity expansion and energy shortage. Energy-saving and efficient production processes have become the main research direction of metallurgical enterprises. [0003] At present, the production of high-strength and high-toughness thick steel plates mainly adopts the quenching and tempering production method of off-line reheating quenching + tempering, which has a long production cycle and high energy consumption. There is also research on the use of non-quenched and tempered processes to produce high-strength steel plates, such as the 2001 Chinese patent (ZL 01128316.5) "Large input e...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the normalizing + tempering production process still cannot get rid of the shortcomings of long production cycle and high energy consumption

The disadvantage of these two patents is that the steel plate is produced by TMCP, which has strict requirements on various process parameters in the production process, such as heating temperature, rolling temperature at each stage, reduction rate and post-rolling cooling parameters, etc. Process control is difficult, steel plate performance is unstable, welding performance is poor, and the high efficiency and high safety of engineering structure construction cannot be guaranteed, especially as metallurgy, energy, petrochemical, chemical, hydropower and other industries that require high safety performance under pressure. Part material