Technical

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 …

The Table U of ASME BPVC Section II Part D has specified the tensile strength and yield strength values of ASTM A234/ ASME SA-234 Gr. WPB at elevated temperatures, which are used for design calculation purpose only. The minimum tensile strength and yield strength of ASTM A234 WPB at room temperature are 415 MPa and 240 MPa, respectively. Tensile Strengths …

Seamless or welded pipe fittings made from ASTM A234/ ASME SA-234 Grade WPB can be extensively used in applications of ASME Boiler & Pressure Vessel Codes. The ASTM A234 Gr. WPB is a plain carbon steel and its UNS designation is K03006 with P-number of 1. It can be applied to ASME BPVC Section I, III, VIII, and XII, with …