scholarly journals Volatilization Behavior of Manganese from Molten Steel with Different Alloying Methods in Vacuum

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1348
Author(s):  
Jianhua Chu ◽  
Yanping Bao
Keyword(s):  
Vapor Pressure ◽  
Carbon Content ◽  
Thermodynamic Analysis ◽  
Molten Steel ◽  
Manganese Steel ◽  
Volatile Fraction ◽  
High Carbon ◽  
Partial Vapor Pressure ◽  
High Carbon Ferromanganese ◽  
Volatilization Behavior

The volatilization loss of manganese during the vacuum smelting process is one of the key factors that determines the manufacturing cost and quality of manganese steel. In this study, the laboratory experiments and thermodynamic calculations were performed to investigate volatilization behavior of manganese from molten steels with different alloying methods in vacuum process. Based on the thermodynamic analysis, with the increase of manganese content, the partial vapor pressure of the manganese component increased, resulting in manganese being easily volatilized from molten steel. The carbon content in the steel shows an evident influence on partial vapor pressure of manganese component, and a higher carbon content in steel leads to a lower partial vapor pressure of manganese, but it not influenced by the silicon content. Compared with the alloying method of high carbon ferromanganese, the volatilization loss of manganese in the alloying method of silicon manganese presents faster decay, agreeing well with the thermodynamic analysis. Besides, the volatile fraction generated in the alloying method of high-carbon ferromanganese is composed of a large amount of MnO nanorods with a lateral length approximately 500 nm and a small number of Mn3O4/Mn nanoparticles with a diameter less than 500 nm. Additionally, the volatile fraction generated in the alloying method of silicon manganese shows Mn3O4 nanoparticles as the main phase. It can be inferred that the existence of the manganese oxide phase is attributed to the high chemical activity of nanoscale particles within air.

Mechanical and Tribological Characteristics of Sintered Manganese Steels

2011 ◽  
Vol 672 ◽  
pp. 59-62 ◽  
Author(s):  
Marcela Selecká ◽  
Andrej Šalak ◽  
Dagmar Jakubéczyová
Keyword(s):  
Iron Powder ◽  
Life Time ◽  
Manganese Steel ◽  
Tribological Characteristics ◽  
High Carbon ◽  
High Carbon Ferromanganese ◽  
Mechanical And Tribological Characteristics ◽  
Manganese Steels

The effect of three iron powder grades and three manganese carrier types on mechanical and tribological characteristics of sintered 1 -5% Mn steels was investigated. The different effect of iron powder grades in dependence on manganese addition expressed oneself in strength and in wear. The highest strength and highest wear attained the steels with 3% Mn added as high carbon ferromanganese. The components – rollers - prepared from manganese steel exhibited lower wear than that from Fe-4Ni-1.5Cu-0.5Mo powder. The gears for hydrogenerator prepared from Fe-3.5Mn-0.5Mo-0.3C steel exhibited longer life time at increased oil pressure compared with that from through hardened sintered Fe-4Ni-1C steel.

ALGOMA AR225

Alloy Digest ◽  
2003 ◽  
Vol 52 (12) ◽  
Keyword(s):  
Carbon Steel ◽  
Chemical Analysis ◽  
Physical Properties ◽  
Carbon Content ◽  
Brinell Hardness ◽  
Low Cost ◽  
Heat Treating ◽  
Rolled Plate ◽  
High Carbon ◽  
High Carbon Content

Abstract Algoma AR225 is a carbon steel developed primarily to supply a low-cost material for high-abrasion applications. It is furnished in the form of as-rolled plate with a relatively high carbon content (0.35-0.45%). AR-225 is sold on the basis of chemical analysis only; the number 225 signifies the approximate Brinell hardness. On thicknesses one-half inch and over, this Brinell value may be lower than 225 because of higher finishing temperatures. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and joining. Filing Code: CS-138. Producer or source: Algoma Steel Corporation Ltd.

Polyimide as carbon and ceramic polysilazane precursors to obtain high carbon content ceramic for high-temperature applications

2020 ◽  
Author(s):  
André V. B. Andrade ◽  
Luiz F. Belchior Ribeiro ◽  
Emanoelle Diz Acosta ◽  
Fernando J. Da Costa ◽  
Maíra D. Mallmann ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Content ◽  
High Carbon ◽  
High Carbon Content ◽  
Temperature Applications

Effects of Carbon Concentration Upon Oxygen Precipitation in Cz Si

1987 ◽  
Vol 104 ◽  
Author(s):  
S. Hahn ◽  
M. Arst ◽  
K. N. Ritz ◽  
S. Shatas ◽  
H. J. Stein ◽  
...  
Keyword(s):  
Carbon Content ◽  
Carbon Concentration ◽  
High Carbon ◽  
High Carbon Content ◽  
Oxygen Precipitation ◽  
Oxygen Precipitate ◽  
High Carbon Concentration ◽  
Precipitation Characteristics ◽  
C Complex ◽  
Oxide Precipitate

ABSTRACTEffects of high carbon concentration upon oxygen precipitate formation in Cz silicon have been investigated by combining various furnace and rapid thermal annneals. Even though oxide precipitate density increases with increasing carbon levels, Cs, synchrotron radiation section topographs of processed high carbon content wafers (Cs ∼ 4ppma) exhibit Pendellosung fringes, indicating a strain free bulk state. Our optical microscopic data have also shown very few defect etch features inside the bulk. A model based upon a direct coupling of both SiO2 and Si-C complex formation reactions is used to explain rather unique oxygen precipitation characteristics in the high carbon content Cz Si materials.

Effective Controlled Method Adding Carbon into Molten Steel to Produce 55Q Steel

2013 ◽  
Vol 785-786 ◽  
pp. 12-15 ◽  
Author(s):  
Tie Jun Zhang
Keyword(s):  
Carbon Content ◽  
Molten Steel ◽  
Rail Steel ◽  
Light Rail ◽  
Carbon Powder ◽  
Cored Wire ◽  
Injection Process ◽  
Carbon Absorption ◽  
The Mean ◽  
Low Solubility

It is very important to produce 55Q steel with the exact carbon content. Low and inconsistent carbon elemental recovery problems are often encountered when adding pig iron, or carbon powder into the baths of light rail steel. This is the case because carbon presents some of the following characteristics: lower density much more than the molten steel, low solubility in the liquid steel, high affinity due to oxygen. These circumstances lead to difficulties or risks, such as: poor or erratic recovery of alloying carbon element, violent and dangerous splashing, adverse environmental impact. To counter these problems existed in conventional method, carbon cored wire was prepared and wire injection process introduced in this work, and the effects of parameters such as feeding rate, etc on carbon recovery are investigated. The results show when using the carbon wire injection method, stable carbon addition is obtained, that is, the mean recovery of the carbon absorption is 90%, and what's more, the carbon content is under control accurately and environment improved.

scholarly journals Effect of Niobium on Inclusions in Fe-Mn-C-Al Twinning-Induced Plasticity Steel

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 83
Author(s):  
Fangjie Lan ◽  
Wenhui Du ◽  
Changling Zhuang ◽  
Changrong Li
Keyword(s):  
Thermodynamic Analysis ◽  
Volume Fraction ◽  
Manganese Steel ◽  
High Manganese ◽  
High Manganese Steel ◽  
Niobium Content ◽  
Precipitation Temperature ◽  
Steel Increase ◽  
Inclusions In Steel ◽  
Nb Addition

The effect of Nb addition on the composition, morphology, quantity, and size of inclusions in Fe-Mn-C-Al steel was studied by SEM, EDS, and thermodynamic analysis. The research shows that the number of inclusions in Fe-Mn-C-Al high manganese steel decreases obviously after adding 0.04% element Nb, and some inclusions in the steel evolve into complex niobium inclusions. When the niobium content increases to 0.08%, the influence of niobium on inclusions in steel becomes more obvious. The precipitation temperature of inclusions in Fe-Mn-C-Al steel was analyzed by thermodynamics. The results show that the nucleation core of the composite inclusions is AlN, and then NbC and MnS precipitate locally on its surface. With the increase of Nb, the amount and volume fraction of NbC inclusions precipitated in steel increase.

Sign in / Sign up

Export Citation Format

Share Document