Smelting technology of III grade hot-rolled ribbed bars

The technology of threaded steel bar and process is applied in the field of smelting process of grade III hot-rolled threaded steel bar, which can solve the problems of large loss, high alloying cost, long process flow, etc., so as to reduce production cost, simplify process flow and shorten process flow. Effect

Inactive Publication Date: 2012-01-04
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relying on vanadium alloys to increase vanadium mainly has the problem of high alloying costs. Enterprises without vanadium and titanium resources mainly rely on outsourcing expensive vanadium alloys for production, while enterprises with vanadium and titanium resources can use self-produced vanadium alloy

Method used

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  • Smelting technology of III grade hot-rolled ribbed bars
  • Smelting technology of III grade hot-rolled ribbed bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Smelting heat 1: This heat smelts ∮6mm HRB400 steel bars, and the lower limit of the internal control of the finished product V is 0.015%. This furnace uses semi-steel steelmaking, the end point of the converter is C: 0.15%, P: 0.025%, S: 0.040%, which meets the requirements for tapping, and then taps. During the tapping process, materials are added in the order of vanadium slag-reductant-silicon-manganese alloy-grained lime-slagging agent, silicon aluminum barium is used as deoxidizer, and the addition amount is 0.2kg / ton of steel, of which the vanadium slag grade is 12.5%. The addition amount is 2kg / ton of steel, the theoretical vanadium addition amount is 0.012%, the reducing agent is aluminum powder, the addition amount is 0.5kg / ton of steel, the addition amount of granular lime is 3kg / ton of steel, and the slag adjustment agent is calcium aluminate Slag agent, its composition range weight percentage is: CaO: 40%, Al 2 o 3 : 20%, SiO 2 ≤10%, the rest are impuriti...

Embodiment 2

[0038] Smelting heat 2: This heat smelts ∮25mm HRB400 steel bars, and the lower limit of the internal control of the finished product V is 0.030%. This furnace uses semi-steel steelmaking, the converter end point C: 0.08%, P: 0.020%, S: 0.035%, which meets the requirements of tapping, and then taps. During the tapping process, materials are added in the order of vanadium slag-reductant-silicon-manganese alloy-grained lime-slagging agent. The deoxidizer uses silicon-aluminum iron, and the addition amount is 0.5kg / ton of steel, of which the vanadium slag grade is 13%. The addition amount is 3.5kg / ton steel, the theoretical vanadium addition amount is 0.020%, the reducing agent is silicon calcium powder, the addition amount is 1kg / ton steel, the granular lime addition amount is 5kg / ton steel, and the slag adjustment agent is calcium aluminate Slagging agent, its composition range weight percent is: CaO: 45%, Al 2 o 3 : 30%, SiO 2 ≤10%, the rest are impurities, and the amount a...

Embodiment 3

[0040] Smelting heat 3: This heat smelts ∮32mm HRB400 steel bars, and the lower limit of the internal control of the finished product V is 0.035%. This furnace uses semi-steel steelmaking, the converter end point C: 0.03%, P: 0.010%, S: 0.033%, which meets the requirements of tapping, and then taps. During the tapping process, materials are added in the order of vanadium slag-reductant-silicon-manganese alloy-grained lime-slagging agent. The deoxidizer uses silicon-aluminum-calcium-barium, and the addition amount is 1.5kg / ton of steel, of which the vanadium slag grade is 13%. , the addition amount is 3.5kg / ton of steel, the theoretical vanadium addition amount is 0.020%, the reducing agent is silicon-calcium powder, the addition amount is 1kg / ton of steel, the addition amount of granular lime is 6kg / ton of steel, and the slag adjustment agent is calcium aluminate It is a slagging agent, and its composition range by weight percentage is: CaO: 45%, Al 2 o 3 : 30%, SiO 2 ≤10%,...

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Abstract

The invention relates to a smelting technology of III grade hot-rolled ribbed bars. The invention belongs to the technical field of steel smelting. The technical scheme of the invention is that: vanadium-containing molten iron is adopted as a raw material; a vanadium increasing process in a bar production procedure is divided into two steps that: first, during a steel producing procedure, vanadium slag extracted from the vanadium-containing molten iron is added, and vanadium elements are reduced and added into molten steel, such that first-step vanadium increasing is carried out; second, when steel is discharged from a converter, vanadium-containing molten iron is directly poured into the ladle, such that second-step vanadium increasing is carried out. During the process, the vanadium elements in the vanadium-containing molten iron are directly converted into the vanadium elements in the vanadium-containing molten steel. The vanadium alloyed raw materials (the vanadium slag and the vanadium-containing molten iron) are internal materials sourced from a steel refinery. With the composite vanadium increasing method, a problem of high cost in the production process of the III grade hot-rolled ribbed bars is solved. The produced ribbed bars satisfy both the performance requirement and the shock resistance requirement. With the method, direct and highly efficient utilization of rare resources is realized, the technology process is reduced, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a smelting process of grade III hot-rolled threaded steel bars, especially the process of vanadium alloying and smelting grade III hot-rolled threaded steel bars by using vanadium slag and vanadium elements in vanadium-containing iron water without adding any vanadium alloy in the production process , belongs to the technical field of metallurgy and steelmaking. Background technique [0002] Hot-rolled threaded steel bars are widely used in the construction field, and are generally divided into grades II, III and IV according to their strength, namely HRB335, HRB400, HRB500 and other grades. At present, II threaded steel bars have been gradually eliminated, and the market share of III-level threaded bars continues to rise, while IV-level steel bars have not yet been widely promoted. Among the grade III rebars, the rebars with anti-seismic performance are favored, and the users pay more and more attention to the grade III anti-...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C5/28C22C38/60C22C38/12
Inventor 白瑞国国富兴王金星韩春良翁玉娟孙福振
Owner HEBEI IRON AND STEEL
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