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Niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production thereof

An anti-seismic reinforcement and micro-alloy technology, which is applied in the field of construction steel manufacturing, can solve the problems of not meeting the requirements of chemical composition and process performance, high content of carbon, micro-alloy and alloy, poor anti-seismic and welding performance, etc., and achieve low strain Effect of aging welding performance, good welding performance, and improvement of seismic performance

Active Publication Date: 2012-11-28
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the "high-strength seismic steel bar and its production method" applied by Tsinghua University, the chemical composition control C 0.08-0.35wt%, Mn 1.8-3.2wt%, there is martensite in the steel structure, which cannot meet the steel GB1499 for reinforced concrete. 2 The chemical composition and process performance requirements stipulated in the standard
Generally speaking, although there are reports on the research and development of 600MPa or HRB600 high-strength steel bars in China, there are high carbon, microalloy and alloy contents in steel, unqualified carbon equivalent, high process cost, poor seismic and weldability of steel, and poor microstructure. Disadvantages such as not meeting the requirements of the GB1499.2 standard

Method used

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  • Niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production thereof
  • Niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production thereof
  • Niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into a 50-ton LD oxygen converter, carry out conventional top-bottom composite blowing, and add lime, dolomite, and magnesite balls according to conventional amounts for slagging; the carbon content at the control end point is 0.05 wt%, the tapping temperature is 1672°C; before tapping, add lime to the bottom of the ladle at an amount of 2.5kg / t of steel, and then add refining slag at an amount of 1.0kg / t of steel; conventional slag washing is used when tapping And blow argon at the bottom of the whole process, control the flow rate of argon to 30NL / min, when the molten steel volume of the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium composite deoxidizer: Si 52.5wt%, Ca 12.3wt%, Ba 11.5wt%; according to 6.1kg / t 钢 The amount of adding Mn content is 76.5wt% high-carbon ferromanganese; by 4.9kg / t 钢 T...

Embodiment 2

[0042] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount for slagging; control the carbon content of the end point to 0.06wt%, The tapping temperature is less than 1676°C; before tapping, add lime to the bottom of the ladle at an amount of 2.5kg / t of steel, and then add refining slag at an amount of 1.0kg / t of steel; use slag washing and full bottom blowing during tapping Argon, control the flow rate of argon gas to 20NL / min, when the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.2kg / t 钢 Add the following mass ratio of silicon-calcium-barium composite deoxidizer: Si 52.5wt%, Ca 12.3wt%, Ba 11.5wt%; according to 7.8kg / t 钢 The amount of adding Mn content is 76.5wt% high-carbon ferromanganese; by 6.9kg / t 钢 The amount of adding Si cont...

Embodiment 3

[0057] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount for slagging; control the carbon content of the end point to 0.06wt%, The tapping temperature is less than 1668°C; before tapping, add lime to the bottom of the ladle at an amount of 2.5kg / t of steel, and then add refining slag at an amount of 1.0kg / t of steel; adopt slag washing and full bottom blowing during tapping Argon, control the flow rate of argon gas to 40NL / min, when the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.5kg / t 钢 Add the following mass ratio of silicon calcium barium composite deoxidizer: Si 52.5wt%, Ca 12.3wt%, Ba 11.5wt%; according to 9.5kg / t 钢 The amount of adding Mn content is 76.5wt% high-carbon ferromanganese; by 7.9kg / t 钢 The amount of adding Si co...

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Abstract

The invention provides a niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar and production of the niobium, titanium and boron microalloy hot-rolled ribbed bar (HRB) 600 high-performance aseismic reinforcing bar. Through molten steel smelting, molten steel casting, billet controlled rolling and controlled cooling, the niobium, titanium and boron microalloy HRB600 high-performance aseismic reinforcing bar is produced and comprises the following chemical constituents according to mass ratio: 0.14-0.18% of C, 0.30-0.50% of Si, 0.50-0.75% of Mn, 0.50-0.70% of Cr, 0.030-0.050% of Nb, 0.0015-0.0030% of B, 0.020-0.040% of Ti, no more than 0.045% of S, no more than 0.045% of P and the balance of Fe and unavoidable impurities. The niobium, titanium and boron microalloy HRB600 high-performance aseismic reinforcing bar has the characteristics of low production cost, technological applicability, strong controllability and the like, the steel microstructure is uniformly distributed and has good form, the refining effect of ferrite is obvious, and the niobium, titanium and boron microalloy HRB600 high-performance aseismic reinforcement has good low-strain timeliness, high strength, good toughness, good welding performance, excellent aseismic performance and excellent combination property.

Description

[0001] technical field [0002] The invention relates to a niobium-titanium-boron microalloy HRB600 high-strength anti-seismic steel bar and a preparation method thereof, belonging to the technical field of construction steel manufacturing. Background technique [0003] High-strength steel bars are the main reinforcing materials and skeleton materials of reinforced concrete in modern building structures, and they carry various stresses and strains in building structures. With the rapid development of the construction industry, complex structures such as large public buildings and high-rise buildings have higher and higher requirements for the load-carrying capacity of steel bars, requiring steel bars to have higher strength, toughness, and better weldability. At present, the foreign construction industry generally adopts hot-rolled ribbed steel bars with good welding performance and high strength. For example, 500MPa and 600MPa steel bars are basically used in EU countries a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21D8/08
CPCY02P10/20
Inventor 严锡九赵宇陈伟张卫强李金柱庾郁梅吴光耀苏灿东邓家木
Owner WUKUN STEEL
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