scholarly journals Factors to Determine Inclusion Compositions in Molten Steel during the Secondary Refining Process of Case-Hardening Steel

2016 ◽  
Vol 56 (11) ◽  
pp. 1973-1981 ◽  
Author(s):  
Takanori Yoshioka ◽  
Kenichiro Nakahata ◽  
Takanori Kawamura ◽  
Yasuhide Ohba
Keyword(s):  
Molten Steel ◽  
Refining Process ◽  
Case Hardening ◽  
Secondary Refining ◽  
Case Hardening Steel

Effect of [Al]s, [Mg], [Ca] in Molten Steel on Inclusion Content for High Speed Wheel Steel during LF-VD Process

2014 ◽  
Vol 898 ◽  
pp. 60-63
Author(s):  
Yu Tang
Keyword(s):  
Fatigue Life ◽  
Molten Steel ◽  
High Speed ◽  
Refining Process ◽  
Fatigue Performance ◽  
Wheel Steel ◽  
Inclusion Content ◽  
High Basicity ◽  
Secondary Refining ◽  
Improve Fatigue

In order to improve fatigue life of wheel steel, LF-VD secondary-refining process is done with Al-deoxidation and slag of high basicity, high Al2O3 content and low oxidizing property. Inclusion content would be influenced by [Al]s, [Mg], [Ca] in molten steel. It is found that Al2O3 inclusions, which are the products of Al-deoxidation, would react with [Mg], [Ca] in molten steel to transform into CaO-MgO-Al2O3 complex inclusions, which is the key for the enhancement of fatigue performance for wheel steel.

Effect of Slag Composition on [Mg], [Ca] Content in Molten Steel for High Speed Wheel Steel

2013 ◽  
Vol 746 ◽  
pp. 501-504
Author(s):  
Tang Yu
Keyword(s):  
Molten Steel ◽  
Slag Composition ◽  
High Speed ◽  
Refining Process ◽  
Wheel Steel ◽  
Complex Inclusion ◽  
High Basicity ◽  
Secondary Refining ◽  
Positive Factor ◽  
Improve Fatigue

In order to improve fatigue life of wheel steel, secondary-refining process is done with Al-deoxidation and slag of high basicity, high Al2O3 content and low oxidizing property. [M, [C content in molten steel would be influenced by slag composition. It is found that high basicity, high Al2O3 content and low oxidizing property is positive factor for proper [M, [C content in molten steel which is the key of inclusion transformation from Al2O3 to CaO-MgO-Al2O3 complex inclusion, contributing to the enhancement of fatigue performance for wheel steel.

Effect of Slag-Metal Reaction on Transformation of Al2O3 inclusions in Pipeline Steel

2011 ◽  
Vol 284-286 ◽  
pp. 1143-1147
Author(s):  
Qiang Li ◽  
Xin Hua Wang ◽  
Hai Bo Li
Keyword(s):  
Molten Steel ◽  
Pipeline Steel ◽  
Refining Process ◽  
High Grade ◽  
Secondary Refining ◽  
Calcium Aluminates ◽  
Hydrogen Induced Cracking ◽  
Liquid Calcium ◽  
Calcium And Magnesium ◽  
Refining Time

For high grade pipeline steel, elimination of Al2O3 inclusions can improve the susceptibility of hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC). In the present work, the transformation of Al2O3 inclusions with slag-metal reaction was studied by controlling ladle slag and relative technologies in LF-RH refining process. It is found that Al2O3 inclusions decrease with increasing refining time, and no pure Al2O3 inclusions exist in molten steel at the end of secondary refining; the remained inclusions in molten steel are liquid calcium aluminates and semi-liquid CaO-MgO-Al2O3 complex inclusions. The analysis of thermodynamic equilibrium proves that CaO and MgO in slag can be reduced by aluminum in molten steel, which is the source of calcium and magnesium in molten steel.

AISI 4320

Alloy Digest ◽  
1959 ◽  
Vol 8 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Heat Treating ◽  
Case Hardening ◽  
High Toughness ◽  
Nickel Chromium ◽  
Steel Mills ◽  
Shock Resistance ◽  
Case Hardening Steel

Abstract AISI 4320 is a nickel-chromium-molybdenum case hardening steel having high toughness and shock resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-80. Producer or source: Alloy steel mills and foundries.

AISI 8615

Alloy Digest ◽  
1965 ◽  
Vol 14 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Alloy Steel ◽  
Heat Treating ◽  
Case Hardening ◽  
Low Carbon ◽  
Heavy Duty ◽  
Core Strength ◽  
Nickel Chromium ◽  
Steel Mills ◽  
Case Hardening Steel

Abstract AISI 8615 is a low-carbon, nickel-chromium-molybdenum alloy steel capable of producing high core strength and toughness. It is a case hardening steel recommended for heavy duty gears, cams, shafts, chains, fasteners, piston pins, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-180. Producer or source: Alloy steel mills and foundries.

AISI 3120

Alloy Digest ◽  
1960 ◽  
Vol 9 (4) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Heat Treating ◽  
Case Hardening ◽  
Low Carbon ◽  
Steel Mills ◽  
Shock Resistance ◽  
Case Hardening Steel

Abstract AISI 3120 is a low-carbon, chromium-nickel case-hardening steel offering good toughness and shock resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-97. Producer or source: Alloy steel mills and foundries.

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