Effect of Bottom Blowing Time and Bottom Blowing Rate on the Nitrogen Content of High Nitrogen Steel

2014 ◽  
Vol 886 ◽  
pp. 28-31
Author(s):  
Rong Hua Zhang ◽  
Biao Wu
Keyword(s):  
Nitrogen Content ◽  
Flow Rate ◽  
Smelting Process ◽  
High Nitrogen Steel ◽  
Maximum Value ◽  
Nitrogen Steel ◽  
Bottom Blowing ◽  
High Pressure Reaction ◽  
The Relationship ◽  
Single Factor Experiment

The Cr18 - Mn18 steel was prepared by the high temperature and high pressure reaction kettle. With bottom blowing time and bottom blowing flow as object to do single factor experiment, the relationship between the nitrogen content in steel smelting process and the bottom blowing time, the bottom blowing flow were studied.The research results show that when the other conditions must be, the nitrogen content in steel increases with the bottom blowing time increasing gradually, when the bottom blowing time reach more than 35 min, the variation of nitrogen content in steel decreases. With the increase of bottom blowing flow rate, the nitrogen content in steel increases gradually, when the bottom blowing flow rate reaches more than 0.24 m3/h, the nitrogen content in steel close to the maximum value and does not change with bottom blowing flow rate.

Comprehensive Analysis of High Nitrogen Steel Refining Factors with High-Pressure and Bottom-Blowing Nitrogen

2010 ◽  
Vol 146-147 ◽  
pp. 445-453
Author(s):  
Gang Qiang Jin ◽  
Shu Huan Wang ◽  
Yu Feng Guo ◽  
Xin Sheng Liu
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Thermodynamics And Kinetics ◽  
Nitrogen Steel ◽  
Surface Active ◽  
Steel Refining ◽  
Nitrogen Steels ◽  
Bottom Blowing

The experimental results on high nitrogen steels refining with high-pressure and bottom-blowing nitrogen were analyzed by the theories of thermodynamics and kinetics in high nitrogen steels smelting. It was shown that nitrogen content in steel increases with the increase of the following factors, that is, pressure, alloying elements (Cr and Mn), bottom-blowing time and bottom-blowing flow. While the nitrogen content in steel decreases with the temperature increase, but it is not obvious. The nitrogen content in steel can also increase with the surface active elements (O and S) decreasing.

Effect of Temperature and Pressure on the Nitrogen Content of High Nitrogen Steel

2014 ◽  
Vol 886 ◽  
pp. 24-27
Author(s):  
Rong Hua Zhang ◽  
Biao Wu
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Nitrogen Content ◽  
Effect Of Temperature ◽  
High Nitrogen Steel ◽  
Temperature Range ◽  
Nitrogen Steel ◽  
Temperature And Pressure ◽  
High Pressure Reaction ◽  
Increasing Temperature

In this study, nitrogen content greater than 0.9% of 18Cr18MnN austenitic stainless steel were prepared by high pressure reaction kettle. The relationships between nitrogen content and temperature, pressure were studied. The results show the nitrogen content in steel increases with increasing melting pressure, at air pressure 1.0MPa<P<1.4MPa, the increase of nitrogen content in steel is evident particularly. In the 1813k<T<1913k temperature range, the nitrogen content in steel decreases with the increasing temperature, there are differences in variation in the temperature range. When temperature is up to 1813K, nitrogen content can be as high as 1.075%. The best thermodynamic condition of melting a nitrogen content of 0.9% 18Mn18Cr austenitic stainless steel is: pressure and temperature are 1.32MPa, 1873k, respectively.

The Effect of Time to Nitrogen Solubility in Steel with High Pressure and Bottom Blowing Nitrogen

2011 ◽  
Vol 402 ◽  
pp. 202-204
Author(s):  
Ai Min Gao ◽  
Xin Kuo Fang ◽  
Shu Huan Wang
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Alloy Steel ◽  
Atmospheric Pressure ◽  
Nitrogen Solubility ◽  
Solubility Limit ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Nitrogen Steel ◽  
Bottom Blowing

The high nitrogen steel is alloy steel whose nitrogen content is more than solubility limit at atmospheric pressure[1]. Bottom-blowing high-pressure nitrogen smelting nitrogen steel has many advantages, in the paper, from the study of 18Mn18CrN,it can come to a conclusion that in the case of Temperature of 1853K, pressure of 1.0MPa, the bottom-blowing flow of 0.16m3 / h and temperature of 1873K, pressure of 1.4MPa, the bottom-blowing flow of 0.16m3 / h, With the bottom-blowing time of increased the nitrogen content in steel increases, but when the time is more the 10 minutes, the nitrogen content is saturated.

Research of Flow Simulation with High-Pressure and Bottom-Blowing Nitrogen

2013 ◽  
Vol 634-638 ◽  
pp. 3110-3113
Author(s):  
Shu Huan Wang ◽  
He Jun Zhang ◽  
Ding Guo Zhao
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Molten Steel ◽  
Gas Content ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Nitrogen Steel ◽  
Bottom Blowing ◽  
Steel Flow ◽  
Pressure Factor

According to the actual situation of refining high nitrogen steel with the laboratory high pressure reaction axe, the molten steel flow field in the high-pressure and bottom-blowing nitrogen reactor was simulated by using the software Fluent. The rules of the influence of pressure factor on the molten steel flow field characteristics, turbulent kinetic energy and gas content were explored. According to the characteristics of the flow field and gas-liquid two phase structure, the rules of the influence of pressure factor on nitrogen concentration distribution were analyzed. So some useful theoretical basis and guidance were provided for laboratory refining high nitrogen steel and industrial production in the future.

Influence of Nitrogen Content on the Microstructure and Precipitate of the Medium-Carbon Vanadium Microalloyed Steel

2011 ◽  
Vol 311-313 ◽  
pp. 817-821 ◽  
Author(s):  
Yun Guan ◽  
Xian Zhong Zhang ◽  
Jia Yan Ma
Keyword(s):  
Phase Transformation ◽  
Nitrogen Content ◽  
Local Area ◽  
Spherical Particles ◽  
Microalloyed Steels ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Medium Carbon ◽  
Nitrogen Steel ◽  
Low Nitrogen

The microstructure and precipitate of the two kinds of medium-carbon vanadium microalloyed steels whose nitrogen contents were 0.0035% and 0.012% respectively, were studied by image analysis and transmission electron microscope (TEM). The results show there are the large amount of 10~20nm dispersion distribution irregular flake VC precipitates within the ferrite, the part of clustered fibrous VC precipitates with the diameter of 4~13nm that grow toward to ferrite intracrystalline along the grain boundary with some angle in the local area, and only a very small amount of 20 ~ 50nm spherical particles V (C, N) in the low-nitrogen steel. However, in the high-nitrogen steel, the precipitates are divided into two stages: the first stage is the part of 30~80nm spherical particles V(C, N) which precipitation in austenite, the second stage is flakiness VC which precipitation in ferrite during the following γ → α phase transformation and cooling process. Compared with the low-nitrogen steel, the number of precipitates in decreased significantly and the size increased obviously in the high-nitrogen steel. The substantial increase of nitrogen content leads to the rapid increase of driving force that V (C, N) precipitation in austenite. A lot of V (C, N) that precipitation before phase transformation results in the significant increase of ferrite nucleation rate, which leads to the microstructure of high-nitrogen steel fined obviously.

The Study of Nitrogen Solubility in High Nitrogen Steels Smelted with High Pressure and Bottom-Blowing Nitrogen

2013 ◽  
Vol 634-638 ◽  
pp. 3170-3173
Author(s):  
Shu Huan Wang ◽  
Long Chen ◽  
Ding Guo Zhao ◽  
Chen Xiao Li ◽  
Yan Hui Wu
Keyword(s):  
High Pressure ◽  
Nitrogen Solubility ◽  
Nitrogen Atmosphere ◽  
Calculation Model ◽  
High Nitrogen ◽  
Nitrogen Steels ◽  
Bottom Blowing ◽  
High Pressure Reaction ◽  
Single Factor Experiment ◽  
Saturated Solubility

The experiments of smelting high nitrogen nickel-free stainless steel were carried out in the high temperature and high pressure reaction kettle. The nitrogen content was more than 1.36% by using the method of high pressure and bottom blowing nitrogen. With controlling high pressure nitrogen atmosphere and bottom blowing nitrogen, internal react were investigated by single factor experiment. Experimental results shown that there is saturated solubility, while smelting 18Mn18CrN steel with high pressure and bottom blowing nitrogen. Thermodynamic calculation model nitrogen solubility under the condition of high pressure was established, and the influence of nitrogen partial pressure on saturated solubility was researched.

scholarly journals Dynamic Mechanical Properties of High Nitrogen Steel under Combined Loading

2021 ◽  
Vol 1855 (1) ◽  
pp. 012009
Author(s):  
Zizhen Yang ◽  
Cheng Miao ◽  
Hailing Wu ◽  
Tao Zhong ◽  
Lihong Bai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Combined Loading ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Dynamic Mechanical ◽  
Nitrogen Steel
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