Austenitic steels chemical composition

Alloy A286 is an austenitic, precipitation-hardenable stainless steel chemical composition will be found in Table 13.11. 

One laboratory investigation has studied four high austenitic stainless steels and a duplex stainless steel. The low-alloy steel was tested since the corrosion inhibitors used were formulated for carbon and low-alloy steels. Chemical compositions (% by weight) and relevant mechanical properties in as-received conditions are respectively reported in Tables 8.6 and 8.7. 

The uniform structure of Austenite (fee, with the carbides in solution) is the structure desired for corrosion resistance, and it is these grades that are widely used in the chemical industry. The composition of the main grades of austenitic steels, and the US, and equivalent UK designations are shown in Table 7.7. Their properties are discussed below. 

Assume that a hardened steel contains only two phases, martensite and austenite. The problem is to determine the composition of the mixture, when the two phases have the same composition but different crystal structure. The external standard method cannot be used, because it is usually impossible to obtain a reference sample of pure austenite, or of known austenite content, of the same chemical composition as the austenite in the unknown. Instead, we proceed as follows. In the basic intensity equation, Eq. (14-1), we put... 

Susceptibility to intergranular corrosion also can occur in ferritic stainless steels (Ref 86-90). As with the austenitic stainless steels, the extent of the susceptibility is a function of the chemical composition and the thermal history of the steel. Also, the mechanism of intergranular attack is essentially the same for both classes of stainless steels, specifically, attack of lowered-chromium-content regions adjacent to precipitated chromium-rich carbides and nitrides. However, there are... 

Low-temperature structural steels include low-, medium-, and high-strength steels. These steels possess a ferritic, austenitic, martensitic, or mixed structure, depending upon their chemical composition. Differences in phase structure account for differences in weldability and properties at temperatures down to 4 K. 

The tested material is AISI 304 austenitic stainless steel whose chemical composition is shown in Table 1. The tensile test specimens are obtained, from sheets whose thickness is 1.5 mm, according to UNE-EN-ISO 6892-1 and have a gage length of 50 mm and a width of 12.5 mm. 

Table la.4 Chemical composition (wt%) of austenitic stainless steels (Ref. 5)... 

TABLE 14.10. Chemical Composition of Austenitic S and Ferritic Stainless Steels... 

Chemical compositions, heat treatment conditions, physical properties, and hints to weldability of austenitic stainless steels are presented in Tables 3.1-59-3.1-63. 

Table 3.1-60 Chemical composition of austenitic stainless steels... 

Duplex steels have a mixed structure of ferrite and austenite. They contain the ferrite-forming elements Cr and Mo at levels of 20-29 wt%Cr and up to 4 wt% Mo, respectively, and the austenite-forming elements of about 4-9 wt% Ni and up to 0.3 wt% N. Typical examples are presented in Table 3.1-64. These steels solidify as 3-ferrite which will partly transform into austenite upon cooling. Thus, the phase fractions of ferrite and austenite depend not only on the chemical composition, but also on the annealing and cooling conditions. 

For applications in seawater, the main steels used are X2CrNiMoN22-5-3 (2205, 1.4462), X3CrNiMoN27-5-2 (SAE 329, 1.4460) and the cast material GX8CrNiN26-7 (1.4347) [23]. The chemical compositions and the mechanical properties of these steels are in DIN EN 10088-1 to -3 [101,127] and, for the cast material, in SEW 410 [128]. The content of alloying elements is formulated in duplex steels so that the two structural components - the ferrite and austenite phases, are present in the struc-... 

A modification of the chemical composition of the passive films. The composition of the passive films formed on nitrogen-bearing austenitic stainless steels has been analyzed by Auger and ESCA (Clayton and Olefjord, 1995, and references therein, Sadough Vanini et al.. 

MoPlus stainless steel is a trademark of Carpenter Technology. It is a two-phase (duplex) alloy with approximately 45% austenite distributed within a ferrite matrix. Alloy S32950 displays good resistance to chloride SCC, pitting corrosion, and general corrosion in many severe environments. The chemical composition is shown in Table 12.2. 

This a semiaustenitic stainless steel. In the annealed or solution-annealed condition it is austenitic (nonmagnetic), and in the aged or coldworked condition it is martensitic (magnetic). The chemical composition is shown in Table 13.5. 

Alloy G is a high-nickel austenitic stainless steel having the following chemical composition ... 

---