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Technical requirements, specifications and literature for various piping components and equipment.

Stabilized Austenitic Stainless Steels: Type 321 & Type 347

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 of Austenitic Stainless Steels

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 …

General Introduction to Stainless Steels

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 …

Bright Annealing of Austenitic Stainless Steels

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 …

ASME SA-335/ ASTM A335 Gr. P11 Applied to BPVC

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. …

1.25Cr-0.5Mo | 1.25Cr-0.5Mo-Si

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 …

The Heat-Resistant Chromium-Molybdenum Alloy Steels

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 …

Tesile & Yield Strengths of ASTM A234 WPB in ASME BPVC

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 …

ASTM A234 WPB Applied to ASME BPVC

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 …

Tolerances for ASME B16.9 Pipe Fittings

This article introduces both dimension and angularity tolerances for butt welding pipe fittings made in accordance with ASME B16.9. These fittings include elbows, tees, crosses, reducers, caps, 180° returns, and lap joint stub ends. Click the links in Table M to view the drawing and basic dimensions of various pipe fittings. *Table M: drawing and dimensions of ASME B16.9 fittings. …

End Preparation of ASME B16.9 BW Fittings

Butt welding pipe fittings manufactured in accordance with ASME B16.9 may be furnished with three types of welding ends depending on its nominal wall thickness, t: When t is less than 5 mm [0.19″] for carbon steel or ferritic alloy steel and 3 mm [0.12″] for austenitic steel or nonferrous alloys, the fitting shall be furnished with cut square or …

Yield Strengths of ASTM A204 Plates for Elevated Temperatures

The Table Y-1 of ASME BPVC Section II Part D has provided yield strength values for the three steel grades of ASTM A204 for various elevated temperatures. Similar to the tensile strength values, these values are only used for design calculation purpose. Yield Strengths for ASTM A204 Gr. A for Elevated Temperatures Sy & Temp.: yield strength, MPa, for metal …

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