Production of III threading reinforcing bar

A threaded steel bar and production method technology, applied in the field of micro-alloy steel production, can solve the problems of high roll consumption, high power consumption, high production cost, etc., and achieve the effect of cost reduction and simple operation

Active Publication Date: 2007-06-20
湖南华菱涟源钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses few alloying elements, hardly uses the expensive strategic elements vanadium and niobium, and the alloy cost is low; but this process technology requires precise control of the temperature of each process from the billet to the rolled product, which is difficult to control, so the mechanical properties of steel bars Large fluctuations in performance
In addition, its performance (such as welding performance, cold bending performance) is poor
[0005] ③Microalloying plus controlled rolling and controlled cooling process: This process is relatively mature, and the production cost of steel bars is lower than that of pure microalloying process, but t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 95 tons of blast furnace hot metal into a 100 tons converter, add 10 tons of scrap steel into the furnace, blow oxygen for smelting, add slagging materials such as lime for smelting, and sample and analyze. When the [S] and [P] components of molten steel meet the requirements of the 20MnSi smelting standard, add 8.0kg / t of steel manganese ore to the converter, and add 4.0kg / t to the converter at the same time 钢 For reducing agent such as carbon powder, the converter stops top blowing, bottom blowing for 1 min, and sampling and analysis. When the composition of the molten steel meets the requirements of the smelting standard and the molten steel [C]≥0.1%, [M n ] ≥0.25% when steel is tapped. Add 0.9kg / t to the molten steel in the ladle during the tapping process 钢 Deoxidizer such as silicon carbide, 20.0kg / t 钢 Ferro-silicon-manganese alloy and 0.45kg / t 钢 Nitrogen intensifiers such as silicon-nitrogen alloys make the nitrogen content in the steel [N] = 0.015%. At the same ...

Embodiment 2

[0027] Put 95 tons of blast furnace hot metal into a 100 tons converter, add 10 tons of scrap steel into the furnace, blow oxygen for smelting, add slagging materials such as lime for smelting, and sample and analyze. When the [S] and [P] components of molten steel meet the requirements of the 20MnSi smelting standard, add 2.0kg / t to the converter 钢 Manganese ore, while adding 1.0kg / t to the converter 钢 For reducing agent such as ferrosilicon, the converter will continue top blowing for 1.0 min and bottom blowing for 2.0 min, and analyze the advantages of the composition. When the composition of the molten steel meets the standard requirements and the molten steel [C] ≥ 0.1%, [Mn] ≥ 0.25% steel. During the tapping process, 1.5kg / t is added to the ladle molten steel in sequence 钢 Deoxidizer such as silicon-aluminum-iron alloy, 22.0kg / t 钢 Ferro-silicon-manganese alloy and 0.2kg / t 钢 Nitrogen increasing agent such as manganese nitrogen alloy makes the nitrogen content in steel [N]=0.0...

Embodiment 3

[0029] Put 90 tons of blast furnace molten iron into a 100 tons converter, add 15 tons of scrap steel into the furnace, blow oxygen for smelting, add slagging materials such as lime for smelting, and sample and analyze. When the [S] and [p] components of molten steel meet the 20MnSi smelting standard, add 10.0kg / t to the converter 钢 Manganese ore, while adding 6.0kg / t to the converter 钢 For reducing agents such as silicon carbide, the converter will continue top blowing for 2.0 minutes and bottom blowing for 3.0 minutes. Take advantage of the composition sample analysis, when the composition of the molten steel meets the requirements of the standard and the molten steel [C]≥0.1%, [Mn]≥0.25%, the steel will be tapped. Add 0.2kg / t to the ladle molten steel in order during the tapping process 钢 Deoxidizer such as silicon-aluminum-barium alloy, 18.0kg / t 钢 Ferro-silicon-manganese alloy and 0.8kg / t 钢 Nitrogen increasing agent such as manganese nitrogen alloy makes the nitrogen content i...

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Abstract

Production of 20MnSi III thread reinforcing bar is carried out by adding blast-furnace iron water and waste steel into oxygen rotary furnace or electric furnace, oxygen-blowing smelting or supply smelting, adding into manganese and reducing agent, slag-excluding and tapping while reaching to 20MnSi standard, adding into defoliant, ferro-silico-manganese alloy or manganese-ferro alloy or ferro-silicon alloy into steel bag sequentially, adding into nitrogen promoter to make nitrogen content 0.008-0.035%, adding into nitride-containing alloy, blowing argon or nitrogen for steel liquid at 0.01-0.10m3/t.min for 2-9mins, rolling at 1050-1300degree, and penetration cooling at 1.5-1.5degree/second. It costs low and has excellent mechanical performance.

Description

Technical field [0001] The invention relates to a method for producing microalloy steel, in particular to a method for producing 20MnSi hot-rolled reinforced concrete with Class III threaded steel bars. Background technique [0002] Rebar is mainly used in the field of reinforced concrete engineering and construction, and it is required that the rebar have good performance, such as welding performance, cold forming performance and seismic performance. At present, there are four typical processes for producing 20MnSiIII-grade rebar: [0003] ①Microalloying process: that is, adding trace alloying elements such as vanadium (V), niobium (Nb), etc. to the molten steel to meet its mechanical performance requirements through microalloying of molten steel. This process technology is a mature process and is currently the most common technology for producing 20MnSiIII-grade threaded steel bars. The 20MnSiIII-grade threaded steel bars produced by this process technology have stable performa...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/00C21D8/00
Inventor 吴光亮李正邦
Owner 湖南华菱涟源钢铁有限公司
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