Technical

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 …

Significance of Bright Annealing Austenitic stainless steels are widely used in diverse civil, industrial and military applications. They may be provided in many product forms such as bar, rod, plate, sheet, strip, foil, pipe, tube, fitting, flange, and other forgings. A final solution annealing treatment followed by a quench shall be done to make sure that all carbides are fully …

Seamless pipes made of ASME SA-335/ ASTM A335 Grade P11 can be used for applications designed in accordance with a series of ASME Boiler & Pressure Vessel Codes. It has the nominal chemical composition of 1.25Cr-0.5Mo-Si and UNS number of K11597. The ASTM A335 P11 seamless pipe can be applied to ASME BPVC Section I, Section III, and Section VIII. …

Chemical Composition & Characteristics The 1.25Cr-0.5Mo (also known as “1-1/4Cr-1/2Mo”) steel is a typical low alloy heat-resistant steel of the Cr-Mo steel family. It is widely used for applications at elevated temperatures. The figures “1.25” and “0.5” denote the nominal chemical composition of chromium and molybdenum alloying elements respectively. The chromium provides improved oxidation and corrosion resistance, and, the molybdenum …

Chemical Composition & Applications The heat resistant chromium-molybdenum alloy steels refer to a series of ferritic alloy steels that feature deliberate addition of chromium and molybdenum alloying elements. It usually contains 0.5% to 9% Cr and 0.5% to 1.0% Mo, which in combination impart improved creep strength and corrosion resistance at elevated temperatures to the alloy steels. This is the …