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A kind of nitrogen-rich vanadium-niobium microalloyed large-scale hrb400e straight seismic steel bar and preparation method thereof

A technology of vanadium-niobium microalloy and earthquake-resistant steel bar, applied in the metallurgical field, can solve the problems of high steel production cost, unfavorable production cost of steel bar enterprises, lower product market competitiveness, etc. Location and nucleation rate, and the effect of increasing pearlite content

Active Publication Date: 2022-05-06
WUKUN STEEL
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Problems solved by technology

After adding a certain amount of vanadium-nitrogen alloy, ferro-vanadium nitride or ferro-niobium alloy to the steel, the production cost is higher
[0004] At present, there are domestic research reports on the production technology of large-scale HRB400E straight anti-seismic steel bars with a nominal diameter of 32-40mm after the implementation of the GB / T 1499.2-2018 standard, mainly using vanadium-nitrogen microalloying technology, and a few enterprises using niobium microalloying process, when the vanadium microalloying process is used to produce HRB400E, the V content in the steel is mostly controlled at 0.025-0.035wt%; when the niobium microalloying process is used to produce HRB400E, the Nb content in the steel is mostly controlled at 0.020-0.030wt%; In the two processes, a certain amount of vanadium alloy and ferroniobium should be added to the steel. Due to the high price of vanadium alloy and ferroniobium, the cost of microalloying is high, which is not conducive to the reduction of production costs of steel bar enterprises and the improvement of product market competitiveness.
[0005] In view of the situation that the production cost of HRB400E steel bars remains high due to the high production cost of HRB400E steel bars with a nominal diameter of 32-40mm produced by vanadium microalloying or niobium microalloying processes due to the addition of a certain amount of vanadium alloys or niobium-iron alloys to the steel, this The invention aims to provide a low-cost nitrogen-rich vanadium-niobium microalloying method for preparing large-scale HRB400E straight anti-seismic steel bars with a nominal diameter of 32-40mm

Method used

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  • A kind of nitrogen-rich vanadium-niobium microalloyed large-scale hrb400e straight seismic steel bar and preparation method thereof
  • A kind of nitrogen-rich vanadium-niobium microalloyed large-scale hrb400e straight seismic steel bar and preparation method thereof
  • A kind of nitrogen-rich vanadium-niobium microalloyed large-scale hrb400e straight seismic steel bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A. Molten steel smelting: 90kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.21wt%, Si 0.35wt%, Mn 1.05wt%, P 0.030wt%, S 0.028wt% is added to the LD converter in the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.0wt%, Si 0.32wt%, Mn 0.35wt%, P0.095wt%, S 0.018wt%, the rest is Fe and unavoidable impurities); Then press 940kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1350°C, molten iron composition C4.2wt%, Si 0.30wt%, Mn 0.25wt%, P 0.110wt%, S 0.028wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then carry out conventional top-bottom compound blowing, adding conventional lime and lightly burned dolomite to make slag, and the amount of lime added is 23k...

Embodiment 2

[0052] A. Molten steel smelting: 92kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.23wt%, Si 0.42wt%, Mn 1.32wt%, P 0.040wt%, S 0.036wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.1wt%, Si 0.42wt%, Mn 0.40wt%, P0.106wt%, S 0.031wt%, the rest is Fe and unavoidable impurities); Then press 940kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1360 ° C, molten iron composition C4.4wt%, Si 0.38wt%, Mn 0.32wt%, P 0.122wt%, S 0.038wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then carry out conventional top-bottom compound blowing, adding conventional lime and lightly burned dolomite to make slag, and the amount of lime added is 25kg / t 钢 , the addition of l...

Embodiment 3

[0064] A. Molten steel smelting: 95kg / t respectively 钢 、30kg / t 钢 The proportioning ratio of the cold material is loaded, and the scrap steel (chemical composition: C 0.26wt%, Si 0.60wt%, Mn 1.60wt%, P 0.050wt%, S 0.045wt% is added in the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.55wt%, Mn 0.55wt%, P0.120wt%, S 0.045wt%, the rest is Fe and unavoidable impurities); Then press 940kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1370 ° C, molten iron composition C4.5wt%, Si 0.45wt%, Mn 0.40wt%, P 0.135wt%, S 0.045wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, conventional lime and lightly burned dolomite are added to make slag, and the amount ...

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Abstract

The invention discloses a nitrogen-rich vanadium-niobium microalloyed large-scale HRB400E straight anti-seismic steel bar with a nominal diameter of 32-40mm and a preparation method thereof. The steel bar has the following chemical composition in parts by weight: C 0.21-0.25 wt%, Si 0.35- 0.45wt%, Mn 1.34~1.45wt%, V 0.015~0.022wt%, Nb 0.005~0.007wt%, S≤0.045wt%, P≤0.045wt%, N 0.0100~0.0120wt%, the rest is Fe and unavoidable of impurities. The preparation method is realized in sequence according to the following steps: molten steel smelting, deoxidation alloying, molten steel refining in an argon station, molten steel casting, billet heating and billet controlled rolling and controlled cooling processes. The process of the present invention has the characteristics of low production cost, strong process applicability and controllability, etc., and the steel bars produced have the advantages of excellent and stable process mechanical properties, fine and uniform microstructure, good plasticity and toughness, and excellent seismic performance. The microalloying process reduces 45 yuan / t 钢 Above, compared with the existing niobium microalloying process, it is reduced by 25 yuan / t 钢 The above has significant economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nitrogen-rich vanadium-niobium microalloyed large-scale HRB400E straight anti-seismic steel bar with a nominal diameter of 32-40 mm and a preparation method thereof. Background technique [0002] Hot-rolled ribbed steel bar is the main reinforcement material of reinforced concrete building structure, and it carries the stress and strain of loads such as tensile and compressive stress and strain in the structure. At present, the annual output of hot-rolled ribbed steel bars in my country exceeds 200 million tons, and it is the steel material most used in the construction of national economic construction projects. In recent years, with the continuous upgrading of building structures, the strength of steel used has continued to increase, which has promoted the upgrading of building steel bars and the revision and improvement of product standards. The national stan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/06C21C7/06C21C7/072C21C7/00
CPCC22C38/02C22C38/04C22C38/12C22C38/001C22C33/06C21C7/06C21C7/072C21C7/0006
Inventor 陈伟周庆华李志敏李金柱邓家木刘林刚文玉兵陈达双张瑜杨冠龙杨颖
Owner WUKUN STEEL
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