Stainless steels ferritics

Stainless steel, ferritic 17% Cr type 0 2 0 2 <400 Wronglit, cast, clad Good Good 7S 6.0 AlSl type 430 ASTM corrosion- and heat-resisting steels... 

Steel is the most common constructional material, and is used wherever corrosion rates are acceptable and product contamination by iron pick-up is not important. For processes at low or high pH, where iron pick-up must be avoided or where corrosive species such as dissolved gases are present, stainless steels are often employed. Stainless steels suffer various forms of corrosion, as described in Section 53.5.2. As the corrosivity of the environment increases, the more alloyed grades of stainless steel can be selected. At temperatures in excess of 60°C, in the presence of chloride ions, stress corrosion cracking presents the most serious threat to austenitic stainless steels. Duplex stainless steels, ferritic stainless steels and nickel alloys are very resistant to this form of attack. For more corrosive environments, titanium and ultimately nickel-molybdenum alloys are used. 

In many stainless steels, ferrite is precipitated from the residual melt in the interdendritic areas together with austenite, (for example in steel 407, figure 10), and a partition ratio P Q has been calculated as ... 

Strong Attraction Steels carbon, alloy, tool Cast Irons gray, ductile, malleable Cobalt Nickel Stainless Steels ferritic, duplex, martensitic, martensitic precipitation hardening... 

Stainless Steels Ferritic stainless steels exhibit high ductUity and low strength, and consequently, they have little susceptibility to hydrogen... 

Ferritic stainless steel alloys (i.e., AISI 400 series) exhibit a chromium content ranging from 17 to 30 wt.% Cr but have a lower carbon level, usually less than 0.2 wt.% C, than martensitic stainless steels. Ferritic stainless steels exhibit the following common characteristics ... 

Practice for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels. (Ferritic Stainless Steels are now in ASTM A 763.)... 

Amongst the stainless steels, ferritic Cr steels and the austenitic CrNi steels with and without added molybdenum must be considered as passivatable materials for domestic installations. These materials are of particular interest for hot water pipes and hot water tanks, as well as for cold water pipes. The stainless steels suitable for domestic installations are summarised in Table 16. 

Within the class of stainless steels, ferritic chromium steels as well as austenitic chromium-nickel steels, with and without additional molybdenum, can be used as passivatible materials in waste water installations. Table 4 lists the most frequently used chromium-nickel steels, which are also listed in DIN EN 1124-1 [26]. 

Which of the two stainless steels, ferritic or austenitic, would sensitize more under the given conditions ... 

Austenitic Stainless Steels Ferritic Stainless Steels Iron- and Nickel-Base Alloys... 

When good resistance to aqueous sulfide corrosion is required, ferritic stainless steels or duplex stainless steels can be substituted for austenitic stainless steel. Ferritic stainless steels, such as Type 405 (S40500) or Type 430 (S43000), are not susceptible to chloride SCC. The duplex stainless steels have a mixed ferritic-austenitic structure and are resistant to chloride SCC, but not to highly aggressive chloride environments. 

Stainless steels. When chromium is present in amounts in excess of 12%, the steel becomes highly resistance to corrosion. There are several types of stainless steel which are summarized below. Ferritic stainless steels. Ferritic stainless steels contain between 12 and 25% chromium and less than 0.1% carbon. This type of steel cannot be heat treated, but may be strengthened by work hardening. 

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