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Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process

A technology of thin slab continuous casting and microalloyed steel, which is applied in metal rolling and other directions, can solve the problems of uneven structure of microalloyed steel, and achieve the effect of improving comprehensive performance, formability and fatigue performance

Inactive Publication Date: 2006-06-14
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can solve the problem of microalloyed steel with Nb content ≤ 0.07% (Wt.%) produced by EAF-CSP process, and improve the toughness, formability and fatigue performance of the steel plate

Method used

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  • Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process
  • Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process
  • Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process

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Effect test

Embodiment 1

[0039] Technological process: electric furnace or converter smelting, refining, thin slab continuous casting, slabs solidified and then directly enter the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiling.

[0040] Chemical composition of molten steel: 0.05-0.07%C-0.2-0.3%Si-1.0-1.2%Mn-0.01-0.02%P-0.003-0.005%S-0.06%Nb.

[0041] Process parameters: slab entering furnace temperature: 980~1050℃; soaking furnace exit temperature: 1160~1200℃; starting rolling temperature: 1080~1120℃; final rolling temperature: 840~860℃; coiling temperature: 600℃.

[0042] The organization of the steel belt see figure 1, the mechanical properties of the steel strip are shown in Table 1

[0043] Strip thickness

Embodiment 2

[0045] Technological process: electric furnace or converter smelting, refining, thin slab continuous casting, slabs solidified and then directly enter the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiling.

[0046] Chemical composition of molten steel: 0.03-0.05%C-0.2-0.3%Si-1.5-1.8%Mn-0.01%P-0.003%S-0.05%Nb-0.2%Mo.

[0047] Process parameters: Billet entering furnace temperature: 950-1000°C; exiting soaking furnace temperature: 1160-1200°C; starting rolling temperature: 1080-1120°C; final rolling temperature: 830-850°C; coiling temperature: 500-550 ℃.

[0048] The organization of the steel belt see figure 2 , the mechanical properties of the steel strip are shown in Table 2

[0049] Strip thickness

Embodiment 3

[0051] Technological process: electric furnace or converter smelting, refining, thin slab continuous casting, slab solidified and then directly enters the roller hearth heating or soaking furnace, high pressure water descaling, hot rolling, laminar cooling, coiling

[0052] Chemical composition of molten steel: 0.05-0.07%C-0.3-0.5%Si-0.3-0.6%Mn-0.09-0.12%P-0.003-0.005%S-0.05%Nb-0.20-0.30%Cu-0.2-0.3%Ni.

[0053] Process parameters: slab entering furnace temperature: 950-1000°C; exiting soaking furnace temperature: 1140-1170°C; starting rolling temperature: 1040-1070°C; final rolling temperature: 840-860°C; coiling temperature: 600°C.

[0054] The organization of the steel belt see image 3 , the mechanical properties of the steel strip are shown in Table 3.

[0055] Strip thickness

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Abstract

A technology for eliminating the mix-crystal structure of the Nb microalloyed steel manufactured by EAF-CSP flow features that the reasonable technological flow and chemical components, and reasonable technological steps including conticasting, soaking, removing scales, hot rolling and coiling are used.

Description

technical field [0001] The invention relates to the field of alloy steel production technology, in particular to the field of producing Nb microalloyed high-strength steel plates and steel strips by using electric furnace thin slab continuous casting and rolling (EAF-CSP) technology. Background technique [0002] Thin slab continuous casting and rolling technology is a hot-rolled wide-band steel production technology developed in the late 1980s, and EAF-CSP is one of the typical representatives of this technology. This technology organically combines electric furnace steelmaking, refining, thin slab continuous casting, soaking, hot rolling, laminar cooling and coiling, so that the production rhythm of hot-rolled wide strips is accelerated, energy consumption is reduced, and labor productivity is improved. It is a modern high-efficiency production technology of hot-rolled wide-band steel. [0003] Micro-alloyed high-strength steel is a high-tech, high-value-added product in ...

Claims

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Application Information

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IPC IPC(8): B21B1/46
Inventor 毛新平徐志如庄汉洲李烈军沈训良邹安华贾书君李亚军汪兵谢利群苏东
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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