Technical

Definition, Composition, Characteristics & Classifications Wrought austenitic stainless steels refer to austenitic stainless steels which have been processed by one or a combination of two or more wrought processes such as forging, rolling, upsetting, bending, extruding, pressing and drawing. After the wrought process, austenitic stainless steels develop and attain a fiber like grain structure aligned in the principal direction of …

General Introduction The tubing made form ASTM A789 UNS S32760 is a super duplex stainless steel (SDSS) tube. UNS S32760 has guaranteed corrosion performance with the PREN value no less than 40. Similar to UNS S32750, it has excellent resistance to chloride stress corrosion cracking (SCC) and pitting corrosion; it also has much higher strength than the austenitic stainless steels …

General Introduction Alloy 2507, with UNS number S32750, is a famous super duplex stainless steel. As a member of the duplex stainless steel family, it is a two-phase alloy based on the iron-chromium-nickel system with a mixed structure of about equal proportions of austenite and ferrite. Due to the duplex phase balance, Alloy 2507 exhibits excellent resistance to general corrosion …

ASTM A182 Gr. F60 is a standard duplex stainless steel forging grade with nominal composition of 22Cr-5Ni-3Mo-N and UNS S32205. It is widely used for the manufacture of piping components for ASME B31.1 power piping and ASME B31.3 processing piping. Both ASME B31.1 and ASME B31.3 have endorsed ASTM A182 Gr. F60 as a listed material. Temperature Limits & Allowable …

Applicability in ASME BPVC & Temperature Limits Forgings made from ASTM A182 Gr. F60 (UNS S32205), identical with ASME SA-182 Gr. F60, can be used for the construction of boilers and pressure vessels in accordance with ASME BPVC Section III, Section VIII Division 1, Section XII, and Section VIII Division 2, with maximum temperature limits of 600°F, 600°F, 600°F, and …

ASTM A182 Grade F51 is a standard duplex stainless steel with nominal composition of 22Cr–5Ni–3Mo–N. The ASTM A182 F51 forgings may be furnished as flanges, fittings, valve parts or other pressure vessel components. The ASME B31.3 process piping code has endorsed this steel as a listed material. The design minimum temperature for ASTM A182 F51 without impact testing is -60°F …

EN 1092-1 flanges, either made from EN 10273 P250GH hot rolled bars or EN 10222-2 P250GH forgings, are classified into material group 3E0. The pressure-temperature ratings (p/T ratings) for P250GH indicate the maximum allowable pressure (M.A.S in bar unit) at maximum allowable temperature (Temp. in °C unit) for various PN designations of P250GH flanges. The p/T ratings are dependent on …

EN 1092-1 flanges made from P355QH1 forgings of EN 10222-4 can be furnished in PN designations from PN 2.5 through PN 400. EN 10222-4 P355QH1, with the steel number of 1.0571, is a weldable fine grain steel with high proof strength. It is categorized into flange material group 8E3 according to EN 1092-1. EN 10222-4 standard is specifying strength values …

The 5Cr-0.5Mo steel is a member of the heat-resistant chromium-molybdenum (Cr-Mo) alloy steel family. Piping materials made of 5Cr-0.5Mo are widely used for a variety of high pressure and high temperature services such as petroleum cracking facility, coking unit, fertilizer production system, steam facility, and other petrochemical & power applications. It exhibits good resistance to oxidation and creep at elevated …

Sensitization of traditional austenitic SS to intergranular corrosion Traditional austenitic stainless steels such as Type 304 may be sensitized and be subjected to intergranular corrosion. At temperatures above about 1900°F [1040°C], chromium carbides are completely dissolved in traditional austenitic stainless steels. However, when these steels are slowly cooled from these high temperatures or reheated into the range of 425°C to …

Sensitization Mechanism & Influences Austenitic stainless steels, on exposure to temperatures in some certain range for a time long enough, become susceptible to intergranular corrosion. This susceptibility has been termed “sensitization”, which means that the steel is “sensitized”. Sensitization of austenitic stainless steels has been attributed to the precipitation of M23C6 carbides on the austenite grain boundaries. The development of …

What’re Stainless Steels? Stainless steels are iron-base alloys containing at least 10.5% Cr. Few stainless steels contain more than 30% Cr or less than 50% Fe. They form an invisible and adherent chromium-rich oxide surface film. This oxide forms and heals itself in the presence of oxygen. It prevents the further formation of rust in unpolluted atmospheres hence the designation …