scholarly journals The Effect of Pressure and Oxygen, Sulfur and Nitrogen Content on the Rate of Nitrogen Absorption and Desorption of Liquid Steel

1998 ◽  
Vol 84 (6) ◽  
pp. 411-416 ◽  
Author(s):  
Susumu MUKAWA ◽  
Yoshimasa MIZUKAMI ◽  
Yoshiyuki UESHIMA
Keyword(s):  
Nitrogen Content ◽  
Liquid Steel ◽  
Nitrogen Absorption ◽  
Effect Of Pressure

Effect of pressure on synthetic diamond crystals at high temperatures and pressures in Fe/Ni catalyst system

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shuai Fang ◽  
Yongkui Wang ◽  
Liangchao Chen ◽  
Zhiyun Lu ◽  
Zhenghao Cai ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Growth Mechanism ◽  
Synthetic Diamond ◽  
Natural Diamond ◽  
Catalyst System ◽  
Necessary Condition ◽  
Ni Catalyst ◽  
Effect Of Pressure ◽  
Diamond Crystals ◽  
System P

Pressure is a necessary condition for the growth of natural diamond. Studying the effect of pressure on the nitrogen content of diamond is important for exploring the growth mechanism of...

NITRIFICATION UNDER AND AFTER ALFALFA, BROME, TIMOTHY, AND WESTERN RYE GRASS: III. COMPOSITION OF HAY CROP RESIDUES

1940 ◽  
Vol 18c (4) ◽  
pp. 136-141 ◽  
Author(s):  
R. Newton ◽  
R. S. Young
Keyword(s):  
Nitrogen Content ◽  
Crop Residues ◽  
C:N Ratio ◽  
Nitrogen Absorption ◽  
Crude Fibre ◽  
Residual Nitrogen ◽  
Nitrogen Free Extract ◽  
Sequence Effects ◽  
Dominant Influence ◽  
Proximate Analyses

Proximate analyses of roots (to plow depth) and stubble in one-, three-, and five-year-old sods, considered in relation to sequence effects as judged by the nitrogen absorption of the first two wheat crops after each age of sod, indicated the nitrogen content of the hay crop residues to be the dominant influence. Alfalfa was much superior to the grasses, a result apparently of the higher quantity of nitrogen returned to the soil and of the narrower C:N ratio in its residues. Timothy led the grasses, contributing the highest quantity of nitrogen in residues with the lowest percentage of crude fibre and the narrowest ratio of crude fibre to nitrogen-free extract. Brome contributed more residual nitrogen than western rye, but was slightly inferior in sequence effects.

Nitrogen absorption phenomenon of GTA welding with nitrogen-mixed shielding gases: effect of plasma characteristics on nitrogen content in GTA welded metal

2014 ◽  
Vol 29 (4) ◽  
pp. 262-269 ◽  
Author(s):  
Shinji Kodama ◽  
Kazuki Sugiura ◽  
Shota Nakanishi ◽  
Yoshihiro Tsujimura ◽  
Manabu Tanaka ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Gta Welding ◽  
Shielding Gases ◽  
Nitrogen Absorption ◽  
Absorption Phenomenon ◽  
Plasma Characteristics

scholarly journals Effect of Nitrogen Content on the Formation of Inclusions in Fe-5Mn-3Al Steels

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 836 ◽  
Author(s):  
Michelia Alba ◽  
Muhammad Nabeel ◽  
Neslihan Dogan
Keyword(s):  
Nitrogen Content ◽  
Cooling Rate ◽  
Liquid Steel ◽  
Thermodynamic Calculations ◽  
Slow Cooling ◽  
N Content ◽  
Dominant Type ◽  
Gas Purging ◽  
Primary Type ◽  
Pure Al2o3

The effect of N content on the characteristics and formation of inclusions in the Fe-5Mn-3Al steels was investigated in this study. Two synthetic steel melts were produced by two different methods—N2 gas purging and injecting—to introduce nitrogen into the melt. The N content of steel melt varied from 2 to 54 ppm. An increase in the N content to 47 ppm (for 533N-P) and 58 ppm (for 533N-I) increased the total amount of inclusions from 13 to 64 mm−2 and from 21 to 101 mm−2, respectively. The observed inclusions were Al2O3(pure), Al2O3-MnS, AlN(pure), AlN-MnS, AlON, AlON-MnS, and MnS. When the N content was less than 10 ppm, AlN-MnS inclusions were the primary type of inclusions and they formed as solidification products. With an increase in the N content, AlN(pure) inclusions became the dominant type of inclusions as AlN was stable in the liquid steel. These findings were confirmed by thermodynamic calculations. The influence of cooling rate on the types of inclusions was studied and a higher number of AlN-MnS inclusions were observed in samples with slow cooling rate.

scholarly journals Study on greenhouse soil nitrogen absorption and soil layer transport of different summer catch crops with different planting density in North China

2020 ◽  
Vol 143 ◽  
pp. 02023
Author(s):  
Pei Zhiqiang ◽  
Lu Shuchang ◽  
Wang Xi ◽  
Hou Kun ◽  
Ya Zongjie ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Soil Nitrogen ◽  
Sweet Sorghum ◽  
Nitrate Nitrogen ◽  
Soil Layer ◽  
Reduction Rate ◽  
Planting Density ◽  
Nitrogen Absorption ◽  
Catch Crops ◽  
Waxy Corn

In order to improve the utilization rate of nitrogen fertilizer and reduce the environmental pollution risk of the nitrogen accumulation in the vegetable field, this study was carried out in the summer leisure period of the greenhouse vegetable production. This experiment designed different planting density treatments in 2017 and 2018, i.e. for catch waxy corn, 3300 plants/667m2 (WCD1), 5000 plants/667m2 (WCD2), 6600 plants/667m2 (WCD3), for forage sweet sorghum, 4500 plants /667m2 (FSS4), 7000 plants/667m2 (FSS5), 9000 plants/667m2 (FSS6) in 2017; and for catch waxy corn, 4500 plants/667m2 (WCDI), 7000 plants/667m2 (WCDII), 9000 plants/667m2(WCDIII), for forage sweet sorghum, 7000 plants/667m2 (FSSIV), 10000 plants/667m2 (FSSV), 14000 plants/667m2 (FSSVI) in 2018. The results showed that the biomass and nitrogen absorption of the two catch crops began to improve and then decreased with the increase of planting density. The nitrogen absorption amount of the catch waxy corn and forage sweet sorghum was 22.36~28.68 kg/667m2,21.67~24.39 kg/667m2, respectively. Different planting density of catch waxy corn and forage sweet sorghum could significantly reduce the total nitrogen content of 0~30cm soil layer and the nitrate nitrogen content of 0~90cm soil layer, for catch waxy corn and forage sweet sorghum, the reduction rate of total nitrogen content in 0~30cm soil layer was 9.6%~27.0%, 5.7%~23.5%, the reduction rate of nitrate nitrogen content reached 50.0%~90.8%, 80.1%~96.4%, respectively, which effectively controlled the nitrate nitrogen leaching to soil deep layer. Planting catch crops could increase soil urease activity, regulate soil nitrogen transformation. Compared with other treatments, WCDII and FSSV treatment can reduce the initial urease activity and soil nitrate nitrogen content of next crops, which is consistent with the nutrient requirements of broccoli in the early stage of growth. These catch crops planting could reduce the nitrogen environmental risk in the greenhouse soil. Finally, the study proposed that the suitable planting density of catch waxy corn and forage sweet sorghum planted was 6600~7000 plants/667m2, and 9000~10000 plants/667m2, respectively, in the greenhouse summer leisure period. It is more advantageous to improve soil nitrogen absorption and reduce soil nitrogen environmental risks for catch waxy corn.

Research on Nitrogen Control Technology of High-Pressure Bottle Steel

2014 ◽  
Vol 988 ◽  
pp. 177-182
Author(s):  
Chen Jun
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Control Measures ◽  
Nitrogen Control ◽  
Nitrogen Absorption ◽  
High Nitrogen ◽  
Finished Steel ◽  
Casting Technology ◽  
Nitrogen Steel ◽  
Low Nitrogen

Nitrogen content of the high-pressure bottle steel was high and with big fluctuation, it is difficult to control. SO, investigation on nitrogen content of the all steelmaking process is carried out. Results of the investigation indicated that nitrogen content of the aimed steel was high, nitrogen absorption was mainly happened during tapping and in the course of after refining to before casting。And then nitrogen control measures such as low-nitrogen steel melting technology, optimization of deoxidization, protective casting technology is raised. After that nitrogen content of the aimed steel was reduced and nitrogen absorption during tapping and in the course of after refining to before casting was effectively controlled, nitrogen content of the finished steel was stably controlled in 50×10-6, the effect of nitrogen on property of steel is reduced.

The Study of Nitrogen Absorption with Slagging in High Nitrogen Steels Smelted by High Pressure and Bottom-Blowing Nitrogen

2010 ◽  
Vol 146-147 ◽  
pp. 1120-1125 ◽  
Author(s):  
Yu Feng Guo ◽  
Shu Huan Wang ◽  
Gang Qiang Jin
Keyword(s):  
High Pressure ◽  
Nitrogen Content ◽  
Aluminum Content ◽  
Pure Aluminum ◽  
Slag System ◽  
Nitrogen Absorption ◽  
High Nitrogen ◽  
Nitrogen Steels ◽  
Bottom Blowing

The experiment studied the influence of slag system on nitrogen content in high nitrogen steels which refined by the method of high-pressure and bottom-blowing nitrogen under the conditions of 1.0Mpa. The results shows that nitrogen content are up to 1.0% without the over of slag, and after adding slag, nitrogen content are up to 1.39%; Alkalinity of protecting slag has little effect on the nitrogen content, however, there are very effective to increase nitrogen after using CaF2 instead of SiO2 ,and its nitrogen content are as high as 1.48%; the effect of increasing nitrogen are clear by adding no more than 0.5% pure aluminum, but when aluminum content are more than 0.5%, the nitrogen content in steel are not change significantly, meanwhile, if adding CaF2 slag system, it will be more effective increase nitrogen than only adding pure aluminum.

Nitrogen control in liquid steel for slab casting

1995 ◽  
Vol 92 (4) ◽  
pp. 503-510
Author(s):  
W. van der Knoop ◽  
W. H. L. Moonen ◽  
J. Post ◽  
G. van Unen
Keyword(s):  
Nitrogen Content ◽  
Liquid Steel ◽  
Nitrogen Control ◽  
Slab Casting ◽  
Low Nitrogen

For the production of a two piece can (DWI), a continuous aonealed material for tin plate is preferred witb a low nitrogen content. At Hoogovens BOS No. 2, a steelmaking practice has been developed for the entire route to obtain N < 20 ppm. Major features are the blowing techniques to obtain low nitrogen in the BOF, prevention of -pick up during ladle treatrnent and improved shrouding at the caster.

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