Steel ferritic

AU other carbon steel, low-intermediate, and high-aUoy steels, ferritic steels Base metal Deposited weld metal and heat-affected zone (See Note 1) 2. Except when conchtions conform to Note 2, the material shall be heat-treated to control its microstructure by a method appropriate to the material as outlined in the specification applicable to the product form and then impact-tested. (See Note 1.) Deposited weld metal and heat-affected zone shall be impact-tested. 

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 duplex steels, ferrite is a major intentional constituent. The features noted above are relevant the two phases do have differing analyses but not to such an extent as to cause serious corrosion problems. A further... 

Austenitic Steel, Ferritic/Martensitic Steel, and Vanadium Alloy... 

Permeation reduction factors of up to 10,000, or 10 , have been realized with the best coatings based on aluminized steels. Ferritic-martensitic steels that were aluminized had the Fe2Al5 phase predominant in the layer sequence, while a 316L steel had FeAlj and FeAl2 as the main aluminide phases. The best permeation barrier resulted from an external alumina film of about 1 micron in thickness grown on the aluminide layers. ... 

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... 

Superabrasive tools, primarily PCBN, have been used to successfully weld ferritic steels, ferritic stainless steels, austenitic stainless steels, nickel-base superalloys. Invar, and Narloy-Z. Attempts to weld titanium with PCBN tools have been inconclusive. Tool life of 80 m (260 ft) has been demonstrated in FSW of 1018 steel, and very low tool wear has been reported on all other alloys. The primary concern in tool life continues to be fracture, and developments in PCBN grades continue to improve the fracture toughness of the FSW tools. The PCBN tools provide an extremely smooth finish when used for FSW or FSP. 

Loss in tensile ductility is characterized by a decrease in elongation and reduction in area in an ordinary tensile test. It has been observed in steels (ferritic, martensitic, and austenitic), nickel-base alloys, aluminum alloys, and titanium alloys. The percentage loss in ductility depends on the hydrogen content of the alloy. 

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

Schmitt [52] reviewed the effect of elemental sulfur on corrosion of construction materials (carbon steels, ferric steels, austenitic steels, ferritic-austenitic steels (duplex steels), nickel and cobalt-based alloys and titanium. Wet elemental sulfur in contact with iron is aggressive and can result in the formation of iron sulfides or in stress corrosion cracking. Iron sulfides containing elemental sulfur initiate corrosion only when the elemental sulfur is in direct contact with the sulfide-covered metal. Iron sulfides are highly electron conductive and serve to transport electrons from the metal to the elemental sulfur. The coexistence of hydrogen sulfide and elemental sulfur in aqueous systems, that is, sour gases and oils, causes crevice corrosion rates of... 

Mild steel (ferritic) OH NO 3, CNNH HjO, moist CO / COj - gas CO 3 /HC03, molybdates, salts from acetic acid, phosphates, saturated H2O vapour, acid SO 4 , SO4" + H2S. ... 

The results obtained at the end of 1989, and the laboratory tests and examinations identified the most probable scenario involving the nature of the drum steel (ferritic 15 D3) and the simultaneous presence of three factors the existence of start sites (micro-crackmg) m zones of high hardness, residual stresses close to the elastic limit of the matenal, and lastly, the contnbutions of hydrogen which allowed the bottling phenomenon to occur... 

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. 

High-alloy multiphase steels - Ferritic/pearlitic-martensitic steels I 235... 

High-alloy multiphase steels Ferritic/pearlitic-martensitic steels Ferritic-austenitic steels/duplex steels... 

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