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

A production method and weldability technology, applied in the field of metallurgy, can solve the problems of logistics operation pressure in the steel rolling area, and achieve the effects of ensuring flaw detection performance, reducing comprehensive cost and improving qualification rate

Inactive Publication Date: 2017-10-24
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a large number of medium-thick orders are produced in a centralized manner, it will put great pressure on the logistics operation of the steel rolling area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the thickness of the low-cost and high-weldability Q390 medium-thick plate is 16mm, and the chemical composition and mass percentage of the plate are: C: 0.12%, Mn: 1.00%, Si: 0.20%, Als: 0.020%, S: 0.005%, P: 0.018%, Nb: 0.015%, Ti: 0.012%, the balance is Fe and unavoidable impurities; the carbon equivalent is 0.29%.

[0026] The short-process production method of low-cost and high-weldability Q390 medium-thick plate in this embodiment includes smelting, continuous casting, heating, rolling and cooling processes. After cooling, stack cooling is not required to ensure flaw detection performance. The specific process steps are as follows:

[0027] 1) Smelting process: in the LF refining stage, the flow rate of soft blowing and bottom blowing is 80NL / min, and the soft blowing time is 9 minutes;

[0028] 2) Continuous casting process: billet stacking and slow cooling for 50 hours;

[0029] 3) Heating process: soaking section temperature 1200°C;

[003...

Embodiment 2

[0034] In this embodiment, the thickness of the low-cost and high-weldability Q390 medium-thick plate is 20mm, and the chemical composition and mass percentage of the plate are: C: 0.14%, Mn: 1.20%, Si: 0.15%, Als: 0.028%, S: 0.004%, P: 0.013%, Nb: 0.017%, Ti: 0.015%, the balance is Fe and unavoidable impurities; the carbon equivalent is 0.34%.

[0035] The short-process production method of low-cost and high-weldability Q390 medium-thick plate in this embodiment includes smelting, continuous casting, heating, rolling and cooling processes. After cooling, stack cooling is not required to ensure flaw detection performance. The specific process steps are as follows:

[0036] 1) Smelting process: in the LF refining stage, the flow rate of soft blowing and bottom blowing is 90NL / min, and the soft blowing time is 10min;

[0037] 2) Continuous casting process: billet stacking and slow cooling for 48 hours;

[0038] 3) Heating process: soaking section temperature 1260°C;

[0039] 4...

Embodiment 3

[0043] In this embodiment, the thickness of the low-cost and high-weldability Q390 medium-thick plate is 25mm, and the chemical composition and mass percentage of the plate are: C: 0.15%, Mn: 1.12%, Si: 0.18%, Als: 0.032%, S: 0.003%, P: 0.014%, Nb: 0.019%, Ti: 0.020%, the balance is Fe and unavoidable impurities; the carbon equivalent is 0.34%.

[0044] The short-process production method of low-cost and high-weldability Q390 medium-thick plate in this embodiment includes smelting, continuous casting, heating, rolling and cooling processes. After cooling, stack cooling is not required to ensure flaw detection performance. The specific process steps are as follows:

[0045] 1) Smelting process: in the LF refining stage, the soft blowing and bottom blowing flow rate is 80NL / min, and the soft blowing time is 8min;

[0046] 2) Continuous casting process: billet stacking and slow cooling for 53 hours;

[0047]3) Heating process: soaking section temperature 1240°C;

[0048] 4) Rol...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02
CPCC22C38/04C21D8/0226C22C33/04C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 李可斌安海玉臧淼郝鑫郑文超侯蕾尹绍江王云阁王强
Owner TANGSHAN IRON & STEEL GROUP
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