scholarly journals Austenitic-ferritic stainless steel containing niobium

2013 ◽  
Vol 66 (4) ◽  
pp. 467-471
Author(s):  
André Itman Filho ◽  
Wandercleiton da Silva Cardoso ◽  
Leonardo Cabral Gontijo ◽  
Rosana Vilarim da Silva ◽  
Luiz Carlos Casteletti
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Charge Transfer ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Sigma Phase ◽  
Charge Transfer Resistance ◽  
Chemical Compositions ◽  
Transfer Resistance ◽  
Ferritic Stainless Steels

The austenitic-ferritic stainless steels present a better combination of mechanical properties and stress corrosion resistance than the ferritic or austenitic ones. The microstructures of these steels depend on the chemical compositions and heat treatments. In these steels, solidification starts at about 1450ºC with the formation of ferrite, austenite at about 1300ºC and sigma phase in the range of 600 to 950ºC.The latter undertakes the corrosion resistance and the toughness of these steels. According to literature, niobium has a great influence in the transformation phase of austenitic-ferritic stainless steels. This study evaluated the effect of niobium in the microstructure, microhardness and charge transfer resistance of one austenitic-ferritic stainless steel. The samples were annealed at 1050ºC and aged at 850ºC to promote formation of the sigma phase. The corrosion testes were carried out in artificial saliva solution. The addition of 0.5% Nb in the steel led to the formation of the Laves phase.This phase, associated with the sigma phase, increases the hardness of the steel, although with a reduction in the values of the charge transfer resistance.

scholarly journals CORROSION BEHAVIOUR OF AISI 460LI SUPER-FERRITIC STAINLESS STEEL

2019 ◽  
Vol 25 (4) ◽  
pp. 217
Author(s):  
Andrea Di Schino
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Corrosion Behaviour ◽  
Ferritic Stainless Steels ◽  
Ferritic Alloys ◽  
Cr Content ◽  
Super Ferritic Stainless Steel ◽  
Steel Market

<p class="AMSmaintext1"><span lang="EN-GB">Following nickel and molybdenum significant price increase, nowadays the stainless steel market is moving toward an increasing use of ferritic stainless steel instead of austenitic stainless and therefore to the development of advanced ferritic stainless steels grades aimed to substitute the more expensive austenitic materials in all applications allowing it. Super-ferritic stainless steels are higher chromium (Cr) and molybdenum (Mo) steels with properties similar to those of standard ferritic alloys. Such elements increase high temperature and corrosion resistance in strong environment. This paper deal about the corrosion resistance of super-ferritic stainless steels with a Cr content ranging from 21% to 24%. </span></p>

ARMCO 444

Alloy Digest ◽  
2000 ◽  
Vol 49 (7) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Crevice Corrosion ◽  
Low Carbon ◽  
Ferritic Stainless Steels ◽  
Low Nitrogen

Abstract Armco Type 444 is a low-carbon, low-nitrogen, ferritic stainless steel that provides pitting and crevice corrosion resistance superior to that of most ferritic stainless steels. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming and joining. Filing Code: SS-798. Producer or source: Armco Inc.

MAGIVAL MG2

Alloy Digest ◽  
2013 ◽  
Vol 62 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Coercive Force ◽  
Magnetic Permeability ◽  
Stainless Steels ◽  
Heat Treating ◽  
Steel Grade ◽  
High Permeability ◽  
Ferritic Stainless Steels ◽  
Magnetic Applications

Abstract MAGIVAL MG2 is a free machining ferritic stainless steel grade with the same high machinability and corrosion resistance as type 430F, but offering a higher magnetic permeability and lower coercive force than MG1 (Alloy Digest SS-1159, October 2013). Magival is a group of easily workable ferritic stainless steels developed for magnetic applications where high permeability and low coercive force are required. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1161. Producer or source: Valbruna Stainless Steel.

Electrochemical Characteristics of 410 Stainless Steel Produced by MIM Process through EIS Method under SSRT Test

2012 ◽  
Vol 706-709 ◽  
pp. 2008-2013
Author(s):  
Satoshi Sunada ◽  
Norio Nunomura ◽  
Kazuhiko Majima
Keyword(s):  
Aqueous Solution ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Deionized Water ◽  
Electrochemical Characteristics ◽  
Transfer Resistance ◽  
Impurities And Defects

In this experiment two kinds of 410L stainless steel, i.e., the first one is prepared by the I/M process and the second one is prepared by MIM process were used, and their corrosion behavior under stress in deionized water and the aqueous solution of 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33) has been investigated by Electrochemical Impedance Spectroscopy (hereafter shortened as EIS) under Slow Strain Rate Tensile (hereafter shortened as SSRT) test. The charge transfer resistance (Rct) of the I/M specimen is larger than that of the MIM specimen irrespective of under stress or non-stress, which means that the I/M specimen has the better corrosion resistance than the MIM specimen in the 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33) solution. It was also confirmed from the fracture surface observation that hydrogen embrittlement occurred on the MIM specimen in the aqueous solution of 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33). This result would be confirmed to be due to the existing impurities and defects in the MIM specimen.

NSSC FW1

Alloy Digest ◽  
2011 ◽  
Vol 60 (12) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Alloying Element ◽  
Ferritic Stainless Steels ◽  
Steel Corporation

Abstract NSSC FW1 is one of the first ferritic stainless steels to have tin (Sn) added as a specific alloying element and is one alloy of an FW series. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming and joining. Filing Code: SS-1111. Producer or source: Nippon Steel & Sumikin Stainless Steel Corporation.

ARCELORMITTAL K36X

Alloy Digest ◽  
2010 ◽  
Vol 59 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Lower Cost ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Bend Strength

Abstract ArcelorMittal K36X is a ferritic stainless steel, mostly used as a stable price lower cost substitute for nickel containing austenitic stainless steels for corrosion applications. The “X” indicates this alloy is a muffler grade. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1068. Producer or source: Arcelor Stainless Processing LLC.

MAGIVAL MG1

Alloy Digest ◽  
2013 ◽  
Vol 62 (10) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Coercive Force ◽  
Physical Properties ◽  
Stainless Steels ◽  
Heat Treating ◽  
Steel Grade ◽  
High Permeability ◽  
Ferritic Stainless Steels ◽  
Magnetic Applications

Abstract MAGIVAL MG1 is the best known ferritic free machining stainless steel grade, developed for magnetic applications, and it has high machinability and corrosion resistance similar to type 430F. Magival steels are easily workable ferritic stainless steels developed for magnetic applications where high permeability and low coercive force are required. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1159. Producer or source: Valbruna Stainless Steel.

Correlating Microstructural Features and Surface Roughening in Ferritic Stainless Steel

2007 ◽  
Vol 550 ◽  
pp. 65-74 ◽  
Author(s):  
R.D. Knutsen
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Surface Roughening ◽  
Ferritic Stainless Steels ◽  
Transverse Strains ◽  
Different Levels

The surface ridging behaviour during tensile straining has been characterised for two ferritic stainless steels possessing different austenite potentials (0.1 and 0.6 respectively). Microstructural and texture heterogeneities have been detected to different levels in each steel and are used to explain the extent of surface ridging by considering a ridging mechanism arising from differential transverse strains. Orientation images are presented to trace the development of orientation clusters during recrystallisation.

The Effect of Heating Rate and Temperature on Microstructure and R-Value of Type 430 Ferritic Stainless Steel

2018 ◽  
Vol 941 ◽  
pp. 364-369
Author(s):  
Matias Jaskari ◽  
Antti Järvenpää ◽  
L. Pentti Karjalainen
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Heating Rate ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
High Heating Rate ◽  
Rolled Sheet ◽  
Ferritic Stainless Steels ◽  
Cold Rolled ◽  
R Value

Typical applications of ferritic stainless steels require good formability of a steel that is highly dependent on the processing route. In this study, the effects of heating rate and peak temperature on the texture and formability of a 78% cold-rolled unstabilized 17%Cr (AISI 430) ferritic stainless steel were studied. The cold-rolled sheet pieces were heated in a Gleeble 3800 simulator at the heating rates of 25 °C/s and 500 °C/s up to various peak temperatures below 950 °C for 10 s holding before the final cooling at 35 °C/s to room temperature. Microstructures were characterized and the texture of the annealed samples determined by the electron backscatter diffraction method. The R-value in various directions was determined by tensile straining to 15%. It was established that the high heating rate of 500 °C/s tends to promote the nucleation of grains with the {111}<uvw> orientations during the early state of the recrystallization. The higher heating rate led to a slightly finer grain size and to a marginal improvement in the intensity of the gamma-fibre texture. A coarser grain size would be beneficial for the formability, but the grain growth was suppressed due to low peak temperatures and a short soaking time. Anyhow, the fast annealing resulted in an enhanced R-value in the transverse to rolling direction. The results indicate that even a short annealing cycle is plausible for producing ferritic stainless steels with the formability properties comparable to those of commercial counterparts.

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