Low-cost and high-weldability Q390 medium-thick plate and short-procedure production method thereof

Abstract

The invention discloses a low-cost and high-weldability Q390 medium-thick plate and a short-procedure production method thereof. The low-cost and high-weldability Q390 medium-thick plate comprises chemical components, by mass percent, 0.12%-0.16% of C, 1.00%-1.20% of Mn, 0.15%-0.25% of Si, 0.005% or less of S, 0.018% or less of P, 0.020%-0.040% of Als, 0.015%-0.022% of Nb, 0.012%-0.020% of Ti, and the balance Fe and unavoidable impurities. The protection method comprises smelting, continuous casting, heating, rolling and cooling working procedures. The low-cost and high-weldability Q390 medium-thick plate is designed by adopting a C-Mn-Nb-Ti component system, the addition amount of Mn and Nb is reduced, the carbon equivalent is controlled to be 0.36% or less, the mechanical performance of the steel plate is guaranteed through ultrafast cooling, the production cost is remarkably reduced, and meanwhile welding use of a client is facilitated; and by means of removing of the stack cooling working procedure, the logistics pressure is relieved, and the economic benefits are indirectly improved.

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost high-weldability Q390 medium-thick plate and a short-flow production method thereof. Background technique

[0002] The development of urban integration and the rational use of natural resources have promoted the construction of large-scale public buildings and water conservancy and wind power projects in recent years. At the same time, the advantages of steel structure buildings compared with traditional buildings have gradually been recognized by people, and have achieved relatively rapid development, and the consumption of steel products has also increased. Statistics from the China Iron and Steel Association show that the proportion of Q345 steel used in steel structures has shown a downward trend, and the use of Q390 steel has gradually increased. Especially with the establishment of Xiong'an New District, a national special economic zone, there wil...