ASME SA266 Gr.2 Flanges ASME SA266 Grade 2 CL2 Girth Flanges
Forged carbon steels conforming to ASTM A266/ ASME SA-266 may be applied to the manufacture of various pressure vessel components.
ASME SA266 Gr.2 /ASTM A266 Gr. 2 is a low to intermediate forged carbon steel grade that is commonly used for pressure vessel components such as tubesheets, flanges, and fittings.
We can supply ASME SA266 Gr.2 /ASTM A266 Gr. 2 Flange according to ASME B16.5/ASME B16.47 A& B
ASME SA266 Gr.2 Weld neck flanges,ASME SA266 Gr.2 Blind Flanges.
ASTM A266/ A266M is the standard specification for carbon steel forgings for pressure vessel components. It covers four grades of carbon steel forgings for boilers, pressure vessels, and associated equipment: Grade 1, Grade 2, Grade 3, and Grade 4. The UNS number designation for each grade is K03506 [Grade 1], K03506 [Grade 2], K05001 [Grade 3], and K03017 [Grade 4], respectively. The most commonly used forgings manufactured in accordance with ASTM A266 include tube sheets, hubbed flat heads, or nozzles, that are ordered for ASME Boiler and Pressure Vessel Code applications.
ASME SA266 Gr.2 Flanges Machining
Surfaces shall be machined as designated by the purchaser. Unmachined surfaces shall be sufficiently free of scale to permit inspection.Machining may be performed either prior to or after heat treatment at the option of the manufacturer unless specified in accordance with Supplementary Requirement
ASME SA266 Gr.2 Heat Treatment
After forging and before reheating for heat treatment, the forgings shall be cooled in such a manner as to prevent injury and to accomplish transformation.
All forgings shall be annealed, normalized, or normalized and tempered, but alternatively may be liquid quenched and tempered when mutually agreed upon between the manufacturer and the purchaser. When tempering is performed, it shall be at a subcritical temperature, but no less than 1100 °F [595 °C].
ASME SA266 Gr.2 Chemical Composition
Heat Analysis—The heat analysis obtained from sampling in accordance with Specification A788/A788M shall comply with Table 1 except that the additional features of Supplementary Requirements S11 and S12 shall also apply as individually specified in the ordering information.
Product Analysis—The purchaser may use the product analysis provision of Specification A788/A788M to obtain a product analysis from a forging representing each heat or multiple heat.
ASME SA266 Gr.2 Mechanical Properties
General Requirements—Except when otherwise specified in accordance with Supplementary Requirement S2, the material shall conform to the requirements for mechanical properties prescribed in Table 2 when tested in accordance with the latest issue of Test Methods and Definitions A370 or Test Methods A1058 when the M suffix standard has been specified. The largest obtainable tension test specimen as specified in Test Methods and Definitions A370 or Test Methods A1058, as applicable, shall be used.
ASME SA266 Gr.2 Hardness
The purchaser may check the Brinell hardness of the forging at any location on the surface of the forging, and the hardness shall be within the following limits:
ASME SA266 Gr.2 Certification
In addition to the mandatory certification requirements of Specification A788/A788M, the heat treatment cycle data shall be included.
ASME SA266 Gr.2 Product Marking
Each forging shall be identified in accordance with the Marking Section of Specification A788/A788M. In addition, the forging shall be marked following the grade designation by the letter “A” for annealed, “N” for normalized, “NT” for normalized and tempered, and “S” for liquid quenched and tempered, as applicable.
