HRB400 alloy steel containing Nb and V and smelting process method thereof

A technology of alloy steel and process, applied in the field of HRB400 alloy steel and its smelting process, can solve problems such as poor temperature control, increased consumption of steel materials, and decreased alloy absorption rate

Pending Publication Date: 2019-09-06
YANCHENG LIANXIN IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Through the comparison of the price of NV alloy and NbN alloy, it is found that replacing VN alloy with NbN can reduce the production cost, but because NbN alloy is a dissolution process in steel, the time or intensity of argon blowing, the temperature of tapping and the temperature after argon are not well controlled. It will increase the consumption of steel materials and reduce the absorption rate of alloys

Method used

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  • HRB400 alloy steel containing Nb and V and smelting process method thereof
  • HRB400 alloy steel containing Nb and V and smelting process method thereof

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Embodiment Construction

[0023] A HRB400 alloy steel containing Nb and V, which comprises the following components: C: 0.21-0.25%; Si: 0.40-0.55%; Mn: 1.35-1.50; P≤0.045%; S: ≤0.045%, V: 0.010%-0.015%; Nb0.005%-0.015%, the rest is Fe.

[0024] A kind of smelting process of HRB400 alloy steel containing Nb, V, it comprises the steps:

[0025] ——Material loading, add scrap steel and molten iron into the steelmaking furnace according to the proportion; generally, the total amount of loading is 91±2t, of which molten iron is 67±2t and scrap steel is 24±2t;

[0026] ——Variable pressure and gun operation, control oxygen pressure and gun position, adopt low gun position operation before the end of smelting, oxygen pressure is not less than 0.70MPa;

[0027] ——Slag making control, adopt single slag method, the first batch of slag is controlled according to 2 / 3 of the total amount added, the second batch of slag is added evenly according to the principle of "small amount, frequent addition, and batches", and ...

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Abstract

The invention relates to the technical field of steel production, in particular to HRB400 alloy steel containing Nb and V. The HRB400 alloy steel containing the Nb and the V is prepared from the following components: 0.21 to 0.25 percent of C, 0.40 to 0.55 percent of Si, 1.35 to 1.50 percent of Mn, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, 0.010 to 0.015 percent of V, 0.005 to 0.015 percent of Nb, and the balance Fe. A smelting process of the HRB400 alloy steel containing the Nb and the V comprises the following steps of loading the materials, operating a variable-pressure gun, controlling slagging, controlling a final slag, controlling tapping, adding an alloy and a deoxidizing agent, and soft-blowing a steel ladle. According to the process provided by the invention, the cost is low, the product components meet the requirement, and the quality qualification is realized.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to HRB400 alloy steel containing Nb and V and a smelting process thereof. Background technique [0002] As people's requirements for quality of life are getting higher and higher, anti-seismic steel bars are increasingly sought after by people, especially after the Wenchuan Earthquake on May 12, 2008, the country has increasingly extended the use of anti-seismic steel bars to high-rise buildings. HRB400E manufacturers add a certain amount of FeV or NV alloy to the ladle during the tapping process, which can refine the grain structure of the steel and improve the strength, toughness and wear resistance of the steel. When it is melted into the austenitic When in the body, it can increase the hardenability of the steel. With the increasing demand for vanadium nitrogen alloys, the price of VN alloys is also soaring, which will greatly increase the production cost. In order to redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/04C22C38/02C22C38/60C22C33/04
CPCC22C38/12C22C38/04C22C38/02C22C38/60C22C33/04
Inventor 谢锦官刁承民谢碧风谢碧清张宝富
Owner YANCHENG LIANXIN IRON & STEEL CO LTD
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