Production method of HRB400E high-strength anti-seismic steel bars containing vanadium element and niobium element and steel

A technology of anti-seismic steel bars and niobium-vanadium elements, which is applied in the fields of iron and steel smelting and metal material processing and forming, can solve the problems of unobvious yield point of steel bars, lower phase transition points, and high cost of steel alloys, so as to ensure the performance and quality of steel materials. The effect of crystallization and strength improvement

Inactive Publication Date: 2019-10-18
SHAANXI LONGMEN IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, with the further increase of environmental protection pressure in recent years, the price of vanadium-nitrogen alloy as a production raw material has soared, from 130,000 yuan/ton in 2016 to 480,000 yuan/ton in 2018, making V microalloyed HRB400E The cost of steel alloys produced by the process is relatively high, which is not conducive to enterprises to reduce costs and increase efficiency
[0004] For niobium-iron microalloying, the addition of Nb element will reduce the transformation point, increase the nucleation driving force, and make the fe

Method used

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  • Production method of HRB400E high-strength anti-seismic steel bars containing vanadium element and niobium element and steel
  • Production method of HRB400E high-strength anti-seismic steel bars containing vanadium element and niobium element and steel
  • Production method of HRB400E high-strength anti-seismic steel bars containing vanadium element and niobium element and steel

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Example Embodiment

[0063] Example 1:

[0064] This embodiment is to prepare Φ25mmHRB400E high-strength seismic steel bars.

[0065] Step 1. Shake the 120-ton converter to the molten iron position, and the crane will lift the prepared 30-ton scrap through a scrap bucket to the converter and add it. The ladle is hoisted to the front of the furnace, and 125 tons of molten iron are poured into the furnace; the converter is shaken to the position of blowing (oxygen blowing).

[0066] Step 2, start to lower the oxygen lance, and operate the constant pressure change lance (pressure). While lowering the oxygen lance, add slagging agent (lime 40kg / t, high magnesium ash 20kg / t, sintered ore 5kg / t) into the furnace, Continue to blow oxygen for 4-7 minutes, add the second batch of slagging agent, continue to blow oxygen for 3 to 4 minutes, a total of 12 oxygen blowing minutes, the initial lance position is low (the horizontal position remains unchanged, the height is adjusted to the level of the molten steel 1m)...

Example Embodiment

[0076] Example 2

[0077] To prepare Φ12mmHRB400E high-strength seismic steel bars, the specific steps are as follows:

[0078] Step 1. Shake the 120-ton converter to the position where the molten iron is mixed. The crane hoists the scrap bucket with 30 tons of scrap steel to the front of the converter to add; hoist the molten iron ladle to the front of the furnace, and add 125 tons of molten iron into the furnace; The converter is shaken to the blowing (oxygen blowing) position;

[0079] Step 2. Start to lower the oxygen lance, operate the constant pressure change gun (pressure), and add the slag-making agent (lime 38kg / t, high-magnesium ash 17kg / t, sintered ore 5kg / t) at the same time. One batch was added while lowering the oxygen lance, and the second batch was added while raising the oxygen lance.

[0080] The gun position is low in the early stage (the horizontal position remains unchanged, and the height is adjusted to 1m away from the molten steel surface) to ensure early slag...

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Abstract

The invention discloses a production method of HRB400E high-strength anti-seismic steel bars containing a vanadium element and a niobium element. The production method comprises the following steps that the dosage of each raw material is calculated according to the proportion of the elements of the steel bars to be prepared and the content of each element in the raw materials, and the raw materials are prepared for later use; a converter is shaken to a molten iron mixing position, scrap iron is added into the converter, molten iron is added again, and twice blowing is carried out until the temperature of the molten steel in the converter ranges from 1,670 DEG C to 1,680 DEG C, wherein the content of C element in the molten iron is greater than or equal to 0.06%, the content of P element isless than or equal to 0.035%, and the content of S element is less than or equal to 0.040%; tapping is carried out, and a steel ingot can be obtained by tapping and stabilizing for 5 to 10 minutes; and continuous casting and rolling are carried out in sequence to obtain the niobium-vanadium micro-alloyed HRB400E high-strength anti-seismic steel bars. According to the production method, on the premise of ensuring the strength of the steel bars, the use amount of V element in the high-strength anti-seismic steel bars is reduced, so that the production cost is further reduced.

Description

【Technical field】 [0001] The invention belongs to the technical field of iron and steel smelting and metal material processing and forming, and in particular relates to a production method of HRB400E high-strength anti-seismic steel bars containing niobium vanadium elements and steel products. 【Background technique】 [0002] High-strength anti-seismic steel bars refer to rebars with a strength above 335. At present, HRB400E high-strength anti-seismic steel bars in the iron and steel industry mostly use vanadium nitrogen or ferroniobium for microalloying alone. [0003] For vanadium-nitrogen microalloying, when V element is added, since the solid solution temperature of V element is generally lower than the steel rolling temperature, the grain growth and coarsening will be made after the addition of V element. The strengthening effect is also not obvious. In addition, with the further increase of environmental protection pressure in recent years, the price of vanadium-nitrog...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/60C22C33/06C21D8/08
CPCC21D8/065C21D8/08C22C33/06C22C38/002C22C38/02C22C38/04C22C38/12C22C38/60Y02P10/20
Inventor 马欣郭红民李伟功韩建鹏雷晓刚习晓峰奚建军张朝晖许宏安李都宏郗九生刘安民石自新卫军民梁少鹏康欣王永平王凡王辉
Owner SHAANXI LONGMEN IRON & STEEL
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