The Ferritic Solution - Euro Inox

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1 the 5 feRRitic “faMiLieS” ferritic grades fall into five groups – three families of standard grades and two of “special” grades. by far the greatest current use of ferritics, both in terms of tonnage and number of applications, centres around the standard grades. Standard ferritic stainless steels are plainly, therefore, totally satisfactory and entirely appropriate for many demanding applications. sTANdArd ferrITIC grAdes 91% of total volume in 2006 � Group 1 Group 2 Group 3 10%-14% 14%-18% Types 409, 410, 420 Cr content: 10%-14% Type 430 Cr content: 14%-18% group 1 (type 409/410l) has the lowest chromium content of all stainless steels and is also the least expensive. this group can be ideal for non- or lightly-corrosive environments or applications speCIAl where slight ferrITIC localised grAdes rust is acceptable. type 409 was originally 9% of designed volume in 2006 � for automotive exhaustsystem silencers Group (exterior 4 parts Group in non-severe 5 corrosive environments). type 410l is often used for containers, buses and coaches and, recently, lcd monitor frames. 14%-18% stabilised 30% 48% 13% Added Mo Others 7% 2% Types 434, 436, 444, etc. Mo content above 0.5% Cr content: 18%-30% or not belonging to the other groups Types 430Ti, 439, 441, etc. Cr content: 14%-18%. Include stabilising elements such as Ti, Nb, etc. “Standard ferritic stainless steels are totally satisfactory and entirely appropriate for many demanding applications.” <strong>The</strong> 5 grOups Of ferrITIC grAdes group 2 (type 430) is the most widely used family of ferritic alloys. having a higher chromium content, group 2 grades show greater resistance to corrosion and behave most like austenitic grade 304. in some applications, these grades are suitable to replace type 304 and are usually of high enough grade for indoor applications. typical uses sTANdArd ferrITIC grAdes include washing-machine 91% of total drums, volume in indoor 2006 panels, etc. type � 430 is Group often substituted 1 for Group type 2 304 in household Group utensils, 3 dishwashers, pots and pans. for information on its welding characteristics, see p. 38. 10%-14% 14%-18% group 30% 3 includes types 430ti, 48% 439, 441, etc. 13% compared with group 2, these grades show better weldability and formability. their behaviour is even, in most cases, better than that of 304 austenitic grades. typical applications Types 409, 410, 420 Cr content: 10%-14% include sinks, exchanger tubes (the sugar industry, energy, etc.), exhaust systems (longer life than with type 409) and the welded parts of washing machines. group 3 grades can even replace type 304 in applications where this grade is an over-specification. Types 434, 436, 444, etc. Mo content above 0.5% Type 430 Cr content: 14%-18% speCIAl ferrITIC grAdes 9% of volume in 2006 � Group 4 Group 5 Added Mo Others 7% 2% Cr content: 18%-30% or not belonging to the other groups 14%-18% stabilised Types 430Ti, 439, 441, etc. Cr content: 14%-18%. Include stabilising elements such as Ti, Nb, etc. Containers, in grades 409L and 410L.
group 4 includes types 434, 436, 444, etc. these grades have added molybdenum, for extra corrosion resistance. typical applications include hot water tanks, solar water heaters, visible parts of exhaust systems, electrical-kettle and microwave oven elements, automotive trim and outdoor panels, etc. type 444’s corrosion-resistance level can be similar to that of type 316. group 5 (types 446, 445/447 etc.) has additional chromium and contains molybdenum, for extra corrosion and scaling (oxidation) resistance. this grade is superior to type 316 in respect of these properties. typical uses include applications in coastal and other highly corrosive environments. the corrosion resistance of JiS 447 is equal to that of titanium metal. iMpReSSive RefeRenceS among the success stories of ferritic stainless steels, two typical and extremely demanding applications stand out. for years, ferritic grades have been very extensively used in two extremely demanding applications: automotive exhaust systems and washing-machine drums. exhaust systems are exposed to high temperatures and corrosive environmental conditions. the use of stainless steel (ferritic) makes it possible to extend the warranty period of these parts. washing-machine drums have to withstand detergents and a virtually constantly humid environment. in this context, however, localised corrosion would be utterly inadmissible. car owners and householders will readily testify to their satisfaction with the long life of their washing machines drums and exhaust systems. for manufacturers of these products, “fabrication friendliness” and major economic advantages are additional factors making ferritic stainless steel the obvious choice. “…in many cases, ferritics are emerging as a better choice than more expensive materials.” other current uses of ferritic grades range from kitchenware and catering equipment to indoor furniture and decorative items, automotive trim, superheater and reheater tubes, burners, air-conditioning ducts, barbecue grills, etc. Many new applications are waiting to emerge. today’S exceLLent feRRiticS top-quality ferritic stainless steels have existed for some years now and much intensive research and development has gone into defining the remarkable grades currently available. they are neither new to the market nor to their highly- experienced producers. Strangely, though, attitudes to these steels seem tinged with misconception and ignorance, for largely historical reasons. grade 430 was once the only grade available and early, pioneering users may have received insufficient technical support regarding the use of this grade – especially, perhaps, in the case of welded structures or more corrosive conditions. in any event, the false idea took hold, in some quarters, that ferritics are “inferior” and that only austenitics will do. ferritics moved on a long time ago! full technical support is available today and the range of grades has greatly increased and diversified, to meet users’ needs, in terms of properties. Since these properties are broadly comparable to those of austenitics, it is wrong to see ferritic grades as either inferior or superior. they are just different – and usefully so. Overpass noise-absorbing plate, Japan. Solar water heater, Taiwan. 11
Page 2 and 3: International Stainless Steel Forum
Page 4 and 5: Structural Steelwork for highway br
Page 6 and 7: Foreword “A Steel whoSe time hAS
Page 8 and 9: the Shining appearance of ferritic
Page 10 and 11: 10 in the Sugar induStry, ferritic
Page 12 and 13: 1 WhaT They’re SayIng abouT FerrI
Page 16 and 17: 1 indeed, in many cases, ferritics
Page 18 and 19: 1 peRfection iS MatchinG the Spec i
Page 22 and 23: group 1 ferritics are best suited t
Page 24 and 25: corrosion sets in when ph reaches a
Page 26 and 27: WhaT They’re SayIng abouT FerrITI
Page 28 and 29: ferritic stainless steels have stre
Page 32 and 33: SucceSSfuL dRawinG MeanS • the ab
Page 34 and 35: lubrIcaTIon good lubrication of the
Page 36 and 37: WhaT They’re SayIng abouT FerrITI
Page 38 and 39: this is especially true of “stabi
Page 40 and 41: 0 Several resistance welding techni
Page 42: adheSive bondinG adhesive bonding c
Page 45 and 46: products and applications Ferritics
Page 47 and 48: uilding & ConStruCtion acceSSorIeS
Page 49 and 50: lIFTS eScalaTor STepS grade SuS 430
Page 51 and 52: home & oFFiCe in the following appl
Page 53 and 54: kITchenWare lIQuId dISpenSer grade
Page 55 and 56: Food proceSSIng WallS & ceIlIngS gr
Page 57: trAnSportAtion buS & coach body Fra
Page 60 and 61: 0 10%-14%cr 14%-18%cr group 1 group
Page 62 and 63: iMpreSSiVe uSe of ferritic welded t
Page 64 and 65:
AppendiCeS references bucher, l., p
Page 66 and 67:
66 Appendices List of members Ugine
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The Ferritic Solution - Euro Inox

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